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Legend - object IDs plus links to more info

Data compiled at 1939 UTC on 18 Dec. 2018 for 47 known objects during a period of seven days from 15 to 21 Dec. 2018. Orange is for objects with a new JPL orbit solution (usually from new observation).

Chart
ID

Full ID
Period
Closest
Passage
Uncertainty

Status
JX2018 JX199.07 LD  departed
SD220163899 2003 SD2207.36 LDinbound
TG62018 TG65.21 LDoutbound
VC2018 VC62.63 LD  departed
VL32018 VL3132.94 LD  departed
VO92018 VO92.62 LDoutbound
VX42013 VX46.07 LD  departed
WA32018 WA363.40 LD  departed intruder
WD142008 WD1436.91 LD  departed
WE12018 WE154.27 LD  departed intruder
WH12018 WH117.35 LD  departed Moon buzzer
WR2018 WR51.71 LD  departed
WV2018 WV52.82 LD  departed
WV12018 WV15.65 LDoutbound intruder
WX12018 WX116.06 LD  departed
WZ12018 WZ156.45 LD  departed intruder
XA2018 XA52.60 LD  departed
XA42018 XA49.61 LD+/- 2 minutes  departed intruder
XB2018 XB15.81 LD  departed
XB52018 XB56.95 LD  departed
XC2018 XC45.00 LD  departed
XC42018 XC41.60 LD+/- 6 minutesinbound
XE2018 XE26.11 LD  departed
XE42018 XE411.6 LD+/- 3.3333 hoursapproaching
XF2018 XF27.88 LD  departed
XF22018 XF219.00 LD  departed
XF42018 XF49.43 LD  departed
XG2018 XG16.28 LD  departed
XG12001 XG117.55 LD  departed
XG22018 XG214.63 LD  departed
XG42018 XG42.72 LDoutbound
XJ2018 XJ35.12 LD+/- 3 minutes  departed
XJ12018 XJ16.11 LDoutbound
XL12018 XL14.49 LDoutbound
XN52018 XN55.0 LD+/- 52 minutesinbound
XO42018 XO416.0 LD+/- 3.1833 hoursapproaching
XP22018 XP234.73 LD+/- 2 minutes  departed Moon buzzer
XQ22018 XQ211.3 LD+/- 8 minutes  departed
XR22018 XR218.6 LD+/- 55 minutes  departed
XR42018 XR45.32 LD+/- 2 minutesoutbound
XS42018 XS42.76 LDoutbound
XU2018 XU120.9 LD+/- 1.3667 hours  departed
XW2018 XW14.64 LD  departed
XW32018 XW318.0 LD+/- 13 minutes  departed
XX22018 XX221.91 LD+/- 4 minutes  departed
XX32018 XX34.46 LD+/- 4 minutesoutbound
YM22013 YM219.4 LD+/- 3.746 daysapproaching
DateTfc.Time
15 Dec. '18Rept. Line
16 Dec. '18Rept. Line
17 Dec. '18Rept. Line
18 Dec. '18Rept. Line
19 Dec. '18Rept. Line
20 Dec. '18 Line
21 Dec. '18 Line

Object Details - Skychart objects presented in reverse designation order, newest first
  ("designation assigned to" indicates unofficial discovery credit)

2018 XN5   -   inbound
Approximate diameter25 meters (H=25.677)
Closest Earth approach2.96 LD at 1818 UTC on 24 Dec. 2018 - Note: JPL reports an approach uncertainty of +/- 52 minutes
Inside ten LD of Earth18 to 31 Dec. 2018
Data based onJPL SSD orbit solution #1 downloaded from JPL on 17 Dec. 2018 UTC
based on 12 observations spanning 2 days
Optical observation  
  • reported from 3 observing codes during 1.9116 days: 568, F51, L01
  • designation assigned to Pan-STARRS 1 observation at 0725 UTC 15 Dec. 2018
  • last observed at 0518 UTC on 17 Dec. 2018 by R. Wainscoat via Mauna Kea
Notesrisk, NHATS target
Links  
2018 XB5   -     departed
Approximate diameter49 meters (H=24.196)
Closest Earth approach6.93 LD at 2008 UTC on 14 Dec. 2018
Inside ten LD of Earth12 to 16 Dec. 2018
Data based onJPL SSD orbit solution #3 downloaded from JPL on 18 Dec. 2018 UTC
based on 69 observations spanning 3 days
Optical observation  
  • reported from 15 observing codes during 3.0056 days: 104, 160, 203, 204, 587, 595, C95, H15, J95, K38, L01, T05, T08, U69, Z80
  • designation assigned to ATLAS Mauna Loa observation at 1137 UTC 14 Dec. 2018
  • last observed at 1145 UTC on 17 Dec. 2018 by ATLAS Haleakala
Links  
2018 XS4   -   outbound
Approximate diameter30 meters (H=25.244)
Closest Earth approach2.76 LD at 0731 UTC on 16 Dec. 2018
Inside ten LD of Earth11 to 21 Dec. 2018
Data based onJPL SSD orbit solution #1 downloaded from JPL on 15 Dec. 2018 UTC
based on 32 observations spanning one day
Optical observation  
  • reported from 9 observing codes during 1.3873 days: 104, 204, 587, C95, H15, J95, L01, P93, T08
  • designation assigned to ATLAS Mauna Loa observation at 0726 UTC 14 Dec. 2018
  • last observed at 1643 UTC on 15 Dec. 2018 by Sormano Obs.
Links  
2018 XR4   -   outbound
Approximate diameter15 meters (H=26.801)
Closest Earth approach5.32 LD at 2258 UTC on 17 Dec. 2018 - Note: JPL reports an approach uncertainty of +/- 2 minutes
Inside ten LD of Earth14 to 21 Dec. 2018
Data based onJPL SSD orbit solution #1 downloaded from JPL on 15 Dec. 2018 UTC
based on 27 observations spanning one day
Optical observation  
Notesrisk
Links  
2018 XO4   -   approaching
Approximate diameter29 meters (H=25.364)
Closest Earth approach7.82 LD at 2305 UTC on 6 Jan. 2019 - Note: JPL reports an approach uncertainty of +/- 3.1833 hours
Inside ten LD of Earth30 Dec. until 13 Jan. 2019
Data based onJPL SSD orbit solution #1 downloaded from JPL on 15 Dec. 2018 UTC
based on 10 observations spanning 2 days
Optical observation  
  • reported from 2 observing codes during 2.0094 days: 568, F51
  • designation assigned to Pan-STARRS 1 observation at 0504 UTC 13 Dec. 2018
  • last observed at 0517 UTC on 15 Dec. 2018 by R. Wainscoat via Mauna Kea
NotesNHATS target
Links  
2018 XG4   -   outbound
Approximate diameter11 meters (H=27.514)
Closest Earth approach2.72 LD at 0126 UTC on 15 Dec. 2018
Inside ten LD of Earth9 to 20 Dec. 2018
Data based onJPL SSD orbit solution #1 downloaded from JPL on 15 Dec. 2018 UTC
based on 36 observations
Optical observation  
  • reported from 8 observing codes during 18.370 hours: 204, G96, H01, H15, I52, J95, L01, P93
  • designation assigned to Mt. Lemmon Survey observation at 0337 UTC 14 Dec. 2018
  • last observed at 2159 UTC on 14 Dec. 2018 by Great Shefford Obs.
Links  
2018 XF4   -     departed
Approximate diameter32 meters (H=25.109)
Closest Earth approach7.57 LD at 0654 UTC on 13 Dec. 2018
Inside ten LD of Earth11 to 15 Dec. 2018
Data based onJPL SSD orbit solution #1 downloaded from JPL on 15 Dec. 2018 UTC
based on 83 observations spanning 2 days
Optical observation  
  • reported from 17 observing codes during 1.8181 days: 104, 160, 203, 204, 595, C77, C95, G96, H15, I41, I52, J95, K63, L01, P93, T08, Z80
  • first observed at 0559 UTC on 13 Dec. 2018 by the Palomar Transient Factory
  • designation assigned to Mt. Lemmon Survey observation at 1054 UTC 13 Dec. 2018
  • last observed at 0137 UTC on 15 Dec. 2018 by Farra d'Isonzo Obs.
Links  
2018 XE4   -   approaching
Approximate diameter17 meters (H=26.523)
Closest Earth approach5.34 LD at 2036 UTC on 26 Dec. 2018 - Note: JPL reports an approach uncertainty of +/- 3.3333 hours
Inside ten LD of Earth22 to 30 Dec. 2018
Data based onJPL SSD orbit solution #1 downloaded from JPL on 15 Dec. 2018 UTC
based on 9 observations spanning one day
Optical observation  
  • reported from 3 observing codes during 1.3977 days: 691, F51, L01
  • designation assigned to Pan-STARRS 1 observation at 1041 UTC 13 Dec. 2018
  • last observed at 2014 UTC on 14 Dec. 2018 by Visnjan Obs.
Links  
2018 XC4   -   inbound
Approximate diameter19 meters (H=26.28)
Closest Earth approach1.60 LD at 1532 UTC on 21 Dec. 2018 - Note: JPL reports an approach uncertainty of +/- 6 minutes
Inside Earth SOI20 to 22 Dec. 2018
Inside ten LD of Earth15 to 27 Dec. 2018
Closest Moon approach1.72 LD at 0345 UTC on 21 Dec. 2018
Data based onJPL SSD orbit solution #2 downloaded from JPL on 17 Dec. 2018 UTC
based on 50 observations spanning 3 days
Optical observation  
  • reported from 11 observing codes during 3.1980 days: 203, 204, C95, F51, G96, I52, J95, K38, L01, P93, T08
  • designation assigned to Mt. Lemmon Survey observation at 0826 UTC 13 Dec. 2018
  • last observed at 1311 UTC on 16 Dec. 2018 by ATLAS Mauna Loa
NotesNHATS target
Links  
2018 XA4   -     departed intruder
Approximate diameter5 meters (H=29.061)
Closest Earth approach0.97 LD at 1541 UTC on 11 Dec. 2018 - Note: JPL reports an approach uncertainty of +/- 2 minutes
Inside Earth-Moon system1338-1744 UTC on 11 Dec. 2018
Inside Earth SOI10 to 12 Dec. 2018
Inside ten LD of Earth8 to 15 Dec. 2018
Closest Moon approach0.61 LD at 1008 UTC on 11 Dec. 2018
Inside one LD of Moon0308-1709 UTC on 11 Dec. 2018
Data based onJPL SSD orbit solution #1 downloaded from JPL on 15 Dec. 2018 UTC
based on 17 observations spanning 2 days
Optical observation  
  • reported from 3 observing codes during 1.7413 days: G96, I52, L01
  • designation assigned to Mt. Lemmon Survey observation at 0629 UTC 13 Dec. 2018
  • last observed at 0017 UTC on 15 Dec. 2018 by Visnjan Obs.
Links  
2018 XX3   -   outbound
Approximate diameter4 meters (H=29.635)
Closest Earth approach1.25 LD at 1855 UTC on 10 Dec. 2018 - Note: JPL reports an approach uncertainty of +/- 4 minutes
Inside Earth SOI8 to 12 Dec. 2018
Inside ten LD of Earth30 Nov. until 20 Dec. 2018
Closest Moon approach1.62 LD at 2337 UTC on 9 Dec. 2018
Data based onJPL SSD orbit solution #1 downloaded from JPL on 14 Dec. 2018 UTC
based on 20 observations spanning one day
Optical observation  
  • reported from 3 observing codes during 24.209 hours: G96, I52, J95
  • designation assigned to Mt. Lemmon Survey observation at 0723 UTC 13 Dec. 2018
  • last observed at 0736 UTC on 14 Dec. 2018 by Steward Obs. Mt. Lemmon Station
Notesrisk, NHATS target
Links  
2018 XW3   -     departed
Approximate diameter19 meters (H=26.276)
Closest Earth approach5.49 LD at 0138 UTC on 9 Dec. 2018 - Note: JPL reports an approach uncertainty of +/- 13 minutes
Inside ten LD of Earth6 to 11 Dec. 2018
Data based onJPL SSD orbit solution #1 downloaded from JPL on 14 Dec. 2018 UTC
based on 17 observations spanning one day
Optical observation  
  • reported from 3 observing codes during 24.698 hours: G96, I52, J95
  • designation assigned to Mt. Lemmon Survey observation at 0530 UTC 13 Dec. 2018
  • last observed at 0612 UTC on 14 Dec. 2018 by Steward Obs. Mt. Lemmon Station
Notesrisk
Links  
2018 XX2   -     departed
Approximate diameter22 meters (H=25.965)
Closest Earth approach3.68 LD at 1758 UTC on 6 Dec. 2018 - Note: JPL reports an approach uncertainty of +/- 4 minutes
Inside ten LD of Earth3 to 10 Dec. 2018
Data based onJPL SSD orbit solution #1 downloaded from JPL on 12 Dec. 2018 UTC
based on 22 observations spanning 2 days
Optical observation  
  • reported from 4 observing codes during 1.8563 days: 204, G96, H01, L01
  • designation assigned to Mt. Lemmon Survey observation at 1254 UTC 10 Dec. 2018
  • last observed at 0927 UTC on 12 Dec. 2018 by Magdalena Ridge Obs.
Notesrisk
Links  
2018 XR2   -     departed
Approximate diameter11 meters (H=27.454)
Closest Earth approach4.73 LD at 1007 UTC on 29 Nov. 2018 - Note: JPL reports an approach uncertainty of +/- 55 minutes
Inside ten LD of Earth21 Nov. until 7 Dec. 2018
Data based onJPL SSD orbit solution #1 downloaded from JPL on 12 Dec. 2018 UTC
based on 21 observations spanning 2 days
Optical observation  
  • reported from 5 observing codes during 1.9138 days: G96, H01, H21, I52, L01
  • designation assigned to Mt. Lemmon Survey observation at 0618 UTC 10 Dec. 2018
  • last observed at 0414 UTC on 12 Dec. 2018 by Steward Obs. Mt. Lemmon Station
NotesNHATS target
Links  
2018 XQ2   -     departed
Approximate diameter8 meters (H=28.201)
Closest Earth approach9.20 LD at 2037 UTC on 6 Dec. 2018 - Note: JPL reports an approach uncertainty of +/- 8 minutes
Inside ten LD of Earth1 to 11 Dec. 2018
Data based onJPL SSD orbit solution #2 downloaded from JPL on 13 Dec. 2018 UTC
based on 25 observations spanning 3 days
Optical observation  
  • reported from 6 observing codes during 3.1166 days: 291, G96, H01, H21, I52, L01
  • designation assigned to Mt. Lemmon Survey observation at 0548 UTC 10 Dec. 2018
  • last observed at 0836 UTC on 13 Dec. 2018 by the Spacewatch 1.8m telescope
Notesrisk, NHATS target
Links  
2018 XP2   -     departed Moon buzzer
Approximate diameter8 meters (H=28.073)
Closest Earth approach1.01 LD at 2149 UTC on 8 Dec. 2018 - Note: JPL reports an approach uncertainty of +/- 2 minutes
Inside Earth SOI8 to 9 Dec. 2018
Inside ten LD of Earth7 to 10 Dec. 2018
Closest Moon approach0.69 LD at 1753 UTC on 8 Dec. 2018
Inside one LD of Moon1447-2101 UTC on 8 Dec. 2018
Data based onJPL SSD orbit solution #1 downloaded from JPL on 12 Dec. 2018 UTC
based on 17 observations spanning 2 days
Optical observation  
  • reported from 4 observing codes during 1.9554 days: G96, H01, H21, I52
  • designation assigned to Mt. Lemmon Survey observation at 0445 UTC 10 Dec. 2018
  • last observed at 0341 UTC on 12 Dec. 2018 by Magdalena Ridge Obs.
Links  
2018 XG2   -     departed
Approximate diameter33 meters (H=25.05)
Closest Earth approach5.59 LD at 0150 UTC on 5 Dec. 2018
Inside ten LD of Earth28 Nov. until 11 Dec. 2018
Data based onJPL SSD orbit solution #1 downloaded from JPL on 12 Dec. 2018 UTC
based on 35 observations spanning 9 days
Optical observation  
  • reported from 8 observing codes during 8.7594 days: 104, 204, H21, H36, I52, K51, L01, T08
  • first observed at 0723 UTC on 3 Dec. 2018 by ATLAS Mauna Loa
  • designation assigned to ATLAS Mauna Loa observation at 0721 UTC 10 Dec. 2018
  • last observed at 0137 UTC on 12 Dec. 2018 by Steward Obs. Mt. Lemmon Station
NotesNHATS target
Links  
2018 XF2   -     departed
Approximate diameter19 meters (H=26.222)
Closest Earth approach8.07 LD at 1455 UTC on 7 Dec. 2018
Inside ten LD of Earth5 to 10 Dec. 2018
Data based onJPL SSD orbit solution #2 downloaded from JPL on 13 Dec. 2018 UTC
based on 59 observations spanning 3 days
Optical observation  
  • reported from 14 observing codes during 3.0547 days: 104, 160, 204, 587, 703, G96, H01, H21, I52, K38, K51, K63, L01, Z99
  • designation assigned to Catalina Sky Survey observation at 0626 UTC 10 Dec. 2018
  • last observed at 0745 UTC on 13 Dec. 2018 by the Mt. Lemmon Survey
Notesrisk
Links  
2018 XL1   -   outbound
Approximate diameter14 meters (H=26.879)
Closest Earth approach2.42 LD at 0606 UTC on 12 Dec. 2018
Inside ten LD of Earth5 to 19 Dec. 2018
Data based onJPL SSD orbit solution #1 downloaded from JPL on 11 Dec. 2018 UTC
based on 49 observations
Optical observation  
  • reported from 12 observing codes during 18.989 hours: 104, 160, 204, 587, 703, H01, I52, J95, K38, L01, P93, T05
  • designation assigned to Catalina Sky Survey observation at 0449 UTC 10 Dec. 2018
  • last observed at 2349 UTC on 10 Dec. 2018 by Schiaparelli Obs.
NotesNHATS target
Links  
2018 XJ1   -   outbound
Approximate diameter18 meters (H=26.423)
Closest Earth approach5.58 LD at 0559 UTC on 13 Dec. 2018
Inside ten LD of Earth7 to 19 Dec. 2018
Data based onJPL SSD orbit solution #2 downloaded from JPL on 12 Dec. 2018 UTC
based on 33 observations spanning 3 days
Optical observation  
  • reported from 6 observing codes during 2.9112 days: 104, 587, 703, H01, I52, L01
  • designation assigned to Catalina Sky Survey observation at 0642 UTC 9 Dec. 2018
  • last observed at 0434 UTC on 12 Dec. 2018 by Steward Obs. Mt. Lemmon Station
Links  
2018 XW   -     departed
Approximate diameter36 meters (H=24.84)
Closest Earth approach9.22 LD at 2200 UTC on 8 Dec. 2018
Inside ten LD of Earth6 to 10 Dec. 2018
Data based onJPL SSD orbit solution #4 downloaded from JPL on 13 Dec. 2018 UTC
based on 84 observations spanning 7 days
Optical observation  
  • reported from 16 observing codes during 6.8737 days: 104, 160, 474, 658, E23, H21, H36, I52, J69, J95, L01, Q62, T05, T08, X31, Z80
  • designation assigned to ATLAS Haleakala observation at 1047 UTC 6 Dec. 2018
  • last observed at 0745 UTC on 13 Dec. 2018 by Steward Obs. Mt. Lemmon Station
Links  
2018 XU   -     departed
Approximate diameter53 meters (H=24.034)
Closest Earth approach5.35 LD at 1133 UTC on 21 Nov. 2018 - Note: JPL reports an approach uncertainty of +/- 1.3667 hours
Inside ten LD of Earth19 to 23 Nov. 2018
Data based onJPL SSD orbit solution #1 downloaded from JPL on 8 Dec. 2018 UTC
based on 21 observations spanning 4 days
Optical observation  
  • reported from 6 observing codes during 3.9596 days: 691, G96, H01, H21, I52, L01
  • designation assigned to Mt. Lemmon Survey observation at 0604 UTC 4 Dec. 2018
  • last observed at 0506 UTC on 8 Dec. 2018 by ARO Westfield
Links  
2018 XJ   -     departed
Approximate diameter9 meters (H=27.874)
Closest Earth approach5.76 LD at 2317 UTC on 30 Nov. 2018 - Note: JPL reports an approach uncertainty of +/- 3 minutes
Inside ten LD of Earth27 Nov. until 4 Dec. 2018
Data based onJPL SSD orbit solution #1 downloaded from JPL on 5 Dec. 2018 UTC
based on 33 observations spanning one day
Optical observation  
  • reported from 8 observing codes during 21.554 hours: 033, 104, 204, G96, H01, I52, J04, L01
  • designation assigned to Mt. Lemmon Survey observation at 0627 UTC 4 Dec. 2018
  • last observed at 0400 UTC on 5 Dec. 2018 by Magdalena Ridge Obs.
Links  
2018 XG   -     departed
Approximate diameter16 meters (H=26.607)
Closest Earth approach3.77 LD at 0650 UTC on 7 Dec. 2018
Inside ten LD of Earth2 to 11 Dec. 2018
Data based onJPL SSD orbit solution #4 downloaded from JPL on 8 Dec. 2018 UTC
based on 35 observations spanning 3 days
Optical observation  
  • reported from 9 observing codes during 3.6439 days: 104, 587, 703, H01, I52, J04, J95, K63, L01
  • designation assigned to Catalina Sky Survey observation at 0341 UTC 4 Dec. 2018
  • last observed at 1908 UTC on 7 Dec. 2018 by Great Shefford Obs.
Links  
2018 XF   -     departed
Approximate diameter25 meters (H=25.681)
Closest Earth approach7.84 LD at 1725 UTC on 2 Dec. 2018
Inside ten LD of Earth29 Nov. until 5 Dec. 2018
Data based onJPL SSD orbit solution #1 downloaded from JPL on 5 Dec. 2018 UTC
based on 52 observations spanning one day
Optical observation  
  • reported from 10 observing codes during 1.5954 days: 104, 587, I41, I52, J04, J95, L01, T05, T08, Z80
  • first observed at 0658 UTC on 3 Dec. 2018 by the Palomar Transient Factory
  • designation assigned to ATLAS Haleakala observation at 1022 UTC 3 Dec. 2018
  • last observed at 2116 UTC on 4 Dec. 2018 by San Marcello Pistoiese Obs.
Links  
2018 XE   -     departed
Approximate diameter31 meters (H=25.212)
Closest Earth approach5.71 LD at 1332 UTC on 1 Dec. 2018
Inside ten LD of Earth27 Nov. until 5 Dec. 2018
Data based onJPL SSD orbit solution #3 downloaded from JPL on 9 Dec. 2018 UTC
based on 51 observations spanning 3 days
Optical observation  
  • reported from 12 observing codes during 3.5762 days: 104, 160, 587, B04, I52, J04, J95, K63, L01, T05, W34, Z80
  • designation assigned to ATLAS Haleakala observation at 0924 UTC 3 Dec. 2018
  • last observed at 2314 UTC on 6 Dec. 2018 by Castelmartini Obs.
NotesNHATS target
Links  
2018 XC   -     departed
Approximate diameter23 meters (H=25.829)
Closest Earth approach6.45 LD at 0252 UTC on 1 Dec. 2018
Inside ten LD of Earth28 Nov. until 3 Dec. 2018
Data based onJPL SSD orbit solution #1 downloaded from JPL on 5 Dec. 2018 UTC
based on 22 observations spanning one day
Optical observation  
  • reported from 7 observing codes during 1.6047 days: 104, 587, I41, I52, J04, J95, L01
  • designation assigned to Palomar Transient Factory observation at 0617 UTC 3 Dec. 2018
  • last observed at 2048 UTC on 4 Dec. 2018 by ESA Optical Ground Station
Links  
2018 XB   -     departed
Approximate diameter7 meters (H=28.315)
Closest Earth approach2.06 LD at 1418 UTC on 3 Dec. 2018
Inside Earth SOI2 to 4 Dec. 2018
Inside ten LD of Earth26 Nov. until 10 Dec. 2018
Closest Moon approach2.26 LD at 0258 UTC on 4 Dec. 2018
Data based onJPL SSD orbit solution #1 downloaded from JPL on 5 Dec. 2018 UTC
based on 15 observations spanning 3 days
Optical observation  
  • reported from 3 observing codes during 2.7517 days: I41, J95, T08
  • designation assigned to ATLAS Mauna Loa observation at 0957 UTC 1 Dec. 2018
  • last observed at 0359 UTC on 4 Dec. 2018 by Great Shefford Obs.
NotesNHATS target
Links  
2018 XA   -     departed
Approximate diameter64 meters (H=23.624)
Closest Earth approach8.04 LD at 0638 UTC on 30 Nov. 2018
Inside ten LD of Earth28 Nov. until 1 Dec. 2018
Data based onJPL SSD orbit solution #10 downloaded from JPL on 13 Dec. 2018 UTC
based on 116 observations spanning 11 days
Optical observation  
  • reported from 15 observing codes during 10.9348 days: 160, 691, G40, H06, H45, I52, J04, J95, K63, L04, T05, T08, T12, W34, Z80
  • designation assigned to ATLAS Mauna Loa observation at 0819 UTC 1 Dec. 2018
  • last observed at 0645 UTC on 12 Dec. 2018 by the Spacewatch 0.9m telescope
Notesrisk
Links  
2018 WA3   -     departed intruder
Approximate diameter9 meters (H=27.838)
Closest Earth approach0.84 LD at 0410 UTC on 28 Nov. 2018
Inside Earth-Moon system0037-0743 UTC on 28 Nov. 2018
Inside Earth SOI27 to 28 Nov. 2018
Inside ten LD of Earth25 to 30 Nov. 2018
Closest Moon approach1.55 LD at 0700 UTC on 28 Nov. 2018
Data based onJPL SSD orbit solution #3 downloaded from JPL on 13 Dec. 2018 UTC
based on 28 observations spanning 9 days
Optical observation  
  • reported from 8 observing codes during 9.1706 days: 104, 703, G96, I52, J04, J95, L01, T12
  • designation assigned to Mt. Lemmon Survey observation at 0616 UTC 29 Nov. 2018
  • last observed at 1022 UTC on 8 Dec. 2018 by UH/Tholen NEO Follow-Up 2.24m Telescope
Notesrisk
Links  
2018 WZ1   -     departed intruder
Approximate diameter5 meters (H=29.366)
Closest Earth approach0.28 LD at 1026 UTC on 27 Nov. 2018
Inside Earth-Moon system0308-1745 UTC on 27 Nov. 2018
Inside Earth SOI26 to 28 Nov. 2018
Inside ten LD of Earth24 to 30 Nov. 2018
Closest Moon approach0.88 LD at 1502 UTC on 27 Nov. 2018
Inside one LD of Moon1134-1829 UTC on 27 Nov. 2018
Data based onJPL SSD orbit solution #2 downloaded from JPL on 8 Dec. 2018 UTC
based on 20 observations spanning 8 days
Optical observation  
  • reported from 5 observing codes during 8.0467 days: G96, H01, L01, T12, V06
  • designation assigned to Mt. Lemmon Survey observation at 0850 UTC 28 Nov. 2018
  • last observed at 0957 UTC on 6 Dec. 2018 by UH/Tholen NEO Follow-Up 2.24m Telescope
Notesrisk
Links  
2018 WX1   -     departed
Approximate diameter52 meters (H=24.079)
Closest Earth approach4.82 LD at 0908 UTC on 7 Dec. 2018
Inside ten LD of Earth3 to 11 Dec. 2018
Data based onJPL SSD orbit solution #7 downloaded from JPL on 8 Dec. 2018 UTC
based on 123 observations spanning 8 days
Optical observation  
  • reported from 27 observing codes during 7.6714 days: 104, 113, 118, 160, 585, 718, C77, C95, G40, G96, H01, H36, H45, I52, J69, J95, K38, K41, K61, K63, L01, L04, P93, T05, T08, Z80, Z99
  • designation assigned to Mt. Lemmon Survey observation at 0849 UTC 28 Nov. 2018
  • last observed at 0056 UTC on 6 Dec. 2018 by Great Shefford Obs.
NotesNHATS target
Links  
2018 WV1   -   outbound intruder
Approximate diameter3 meters (H=30.183)
Closest Earth approach0.09 LD at 0310 UTC on 2 Dec. 2018
Inside Earth-Moon system0953 on 30 Nov. until 2029 UTC on 3 Dec. 2018
Inside Earth SOI27 Nov. until 7 Dec. 2018
Inside ten LD of Earth8 Nov. until 25 Dec. 2018
Closest Moon approach0.88 LD at 0653 UTC on 2 Dec. 2018
Inside one LD of Moon0116-1711 UTC on 2 Dec. 2018
Data based onJPL SSD orbit solution #15 downloaded from JPL on 13 Dec. 2018 UTC
based on 87 observations spanning 13 days
Optical observation  
  • reported from 13 observing codes during 13.0399 days: 104, 703, H36, I33, I52, J04, J69, J95, L01, T12, W85, W87, Z80
  • designation assigned to Catalina Sky Survey observation at 0537 UTC 29 Nov. 2018
  • last observed at 0634 UTC on 12 Dec. 2018 by LCO Cerro Tololo A
NotesNHATS target
Links  
2018 WH1   -     departed Moon buzzer
Approximate diameter7 meters (H=28.484)
Closest Earth approach1.18 LD at 2220 UTC on 25 Nov. 2018
Inside Earth SOI23 to 28 Nov. 2018
Inside ten LD of Earth15 Nov. until 6 Dec. 2018
Closest Moon approach0.77 LD at 2058 UTC on 25 Nov. 2018
Inside one LD of Moon0729 on 25 Nov. until 1027 UTC on 26 Nov. 2018
Data based onJPL SSD orbit solution #7 downloaded from JPL on 11 Dec. 2018 UTC
based on 61 observations spanning 12 days
Optical observation  
  • reported from 11 observing codes during 12.0170 days: 204, 291, 587, 703, C77, C95, H01, H21, I52, J95, T12
  • designation assigned to Catalina Sky Survey observation at 0611 UTC 27 Nov. 2018
  • last observed at 0636 UTC on 9 Dec. 2018 by UH/Tholen NEO Follow-Up 2.24m Telescope
Notesrisk, NHATS target
Links  
2018 WE1   -     departed intruder
Approximate diameter22 meters (H=25.973)
Closest Earth approach0.28 LD at 0002 UTC on 25 Nov. 2018
Inside Earth-Moon system1521 on 24 Nov. until 0843 UTC on 25 Nov. 2018
Inside Earth SOI24 to 25 Nov. 2018
Inside ten LD of Earth21 to 28 Nov. 2018
Closest Moon approach0.55 LD at 0650 UTC on 25 Nov. 2018
Inside one LD of Moon2342 on 24 Nov. until 1401 UTC on 25 Nov. 2018
Data based onJPL SSD orbit solution #7 downloaded from JPL on 11 Dec. 2018 UTC
based on 76 observations spanning 13 days
Optical observation  
  • reported from 15 observing codes during 13.0122 days: 204, 291, 587, 691, C77, C95, I52, J04, J95, K41, T05, T08, T12, W34, Z80
  • designation assigned to ATLAS Mauna Loa observation at 1115 UTC 26 Nov. 2018
  • last observed at 1132 UTC on 9 Dec. 2018 by UH/Tholen NEO Follow-Up 2.24m Telescope
Notesrisk
Links  
2018 WV   -     departed
Approximate diameter27 meters (H=25.475)
Closest Earth approach2.97 LD at 1331 UTC on 16 Nov. 2018
Inside ten LD of Earth11 to 21 Nov. 2018
Data based onJPL SSD orbit solution #3 downloaded from JPL on 9 Dec. 2018 UTC
based on 86 observations spanning 19 days
Optical observation  
  • reported from 20 observing codes during 19.0085 days: 104, 160, 595, 658, 718, C77, C95, G96, H01, H21, H36, I52, J69, J95, K38, K63, L01, W34, Z80, Z99
  • designation assigned to Mt. Lemmon Survey observation at 0730 UTC 18 Nov. 2018
  • last observed at 0742 UTC on 7 Dec. 2018 by ARO Westfield
Links  
2018 WR   -     departed
Approximate diameter20 meters (H=26.145)
Closest Earth approach6.73 LD at 1328 UTC on 11 Nov. 2018
Inside ten LD of Earth6 to 16 Nov. 2018
Data based onJPL SSD orbit solution #3 downloaded from JPL on 11 Dec. 2018 UTC
based on 27 observations spanning 21 days
Optical observation  
  • reported from 6 observing codes during 21.0886 days: G96, H01, I52, J95, L01, T12
  • designation assigned to Mt. Lemmon Survey observation at 0947 UTC 18 Nov. 2018
  • last observed at 1155 UTC on 9 Dec. 2018 by UH/Tholen NEO Follow-Up 2.24m Telescope
NotesNHATS target
Links  
2018 VO9   -   outbound
Approximate diameter14 meters (H=26.858)
Closest Earth approach2.62 LD at 1136 UTC on 15 Dec. 2018
Inside ten LD of Earth29 Nov. until 31 Dec. 2018
Data based onJPL SSD orbit solution #10 downloaded from JPL on 11 Dec. 2018 UTC
based on 44 observations spanning 31 days
Optical observation  
  • reported from 6 observing codes during 30.8123 days: 291, 568, F52, I52, J04, T12
  • designation assigned to Pan-STARRS 2 observation at 0628 UTC 9 Nov. 2018
  • last observed at 0158 UTC on 10 Dec. 2018 by Steward Obs. Mt. Lemmon Station
Notesrisk, NHATS target
Links  
2018 VL3   -     departed
Approximate diameter42 meters (H=24.535)
Closest Earth approach8.48 LD at 1341 UTC on 2 Nov. 2018
Inside ten LD of Earth31 Oct. until 4 Nov. 2018
Data based onJPL SSD orbit solution #8 downloaded from JPL on 13 Dec. 2018 UTC
based on 55 observations spanning 35 days
Optical observation  
  • reported from 11 observing codes during 34.7264 days: 104, 291, 474, 695, 703, 807, F52, I52, T05, T08, X31
  • designation assigned to ATLAS Mauna Loa observation at 1202 UTC 5 Nov. 2018
  • last observed at 0528 UTC on 10 Dec. 2018 by Robert Holmes via Cerro Tololo Inter-American Obs.
Links  
2018 VC   -     departed
Approximate diameter19 meters (H=26.293)
Closest Earth approach1.44 LD at 2151 UTC on 28 Oct. 2018
Inside Earth SOI27 to 30 Oct. 2018
Inside ten LD of Earth20 Oct. until 6 Nov. 2018
Closest Moon approach1.95 LD at 0526 UTC on 29 Oct. 2018
Data based onJPL SSD orbit solution #16 downloaded from JPL on 9 Dec. 2018 UTC
based on 138 observations spanning 36 days
Optical observation  
  • reported from 20 observing codes during 36.0084 days: 291, 691, 695, 703, A06, C95, G40, G96, H21, I52, J04, J69, J95, L01, T05, T08, T12, U69, Z80, Z99
  • designation assigned to Mt. Lemmon Survey observation at 0558 UTC 1 Nov. 2018
  • last observed at 0610 UTC on 7 Dec. 2018 by UH/Tholen NEO Follow-Up 2.24m Telescope
Notesrisk, NHATS target
Links  
2018 TG6   -   outbound
Approximate diameter12 meters (H=27.238)
Closest Earth approach3.92 LD at 1604 UTC on 2 Dec. 2018
Inside ten LD of Earth30 Oct. until 5 Jan. 2019
Data based onJPL SSD orbit solution #22 downloaded from JPL on 27 Nov. 2018 UTC
based on 125 observations spanning 43 days
Optical observation  
  • reported from 14 observing codes during 42.6825 days: 291, 474, 568, 691, 734, 807, F52, G96, H21, I33, I52, J95, T12, V06
  • designation assigned to Pan-STARRS 2 observation at 1051 UTC 15 Oct. 2018
  • last observed at 0313 UTC on 27 Nov. 2018 by the Spacewatch 1.8m telescope
NotesNHATS target
Links  
2018 JX   -     departed
Approximate diameter71 meters (H=23.4)
Closest Earth approach3.88 LD at 0711 UTC on 16 May 2018
Inside ten LD of Earth13 to 19 May 2018
Data based onJPL SSD orbit solution #11 downloaded from JPL on 9 Dec. 2018 UTC
based on 148 observations spanning 213 days
Optical observation  
  • reported from 25 observing codes during 212.9101 days: 033, 474, 595, 691, 703, 711, 850, A17, A53, C47, G96, I52, J95, K61, K87, K88, L01, P93, Q66, T08, T12, W71, Y00, Z43, Z80
  • designation assigned to Catalina Sky Survey observation at 0941 UTC 7 May 2018
  • last observed at 0732 UTC on 6 Dec. 2018 by UH/Tholen NEO Follow-Up 2.24m Telescope
Links  
2013 YM2   -   approaching
Approximate diameter19 meters (H=26.2)
Closest Earth approach7.31 LD at 1551 UTC on 9 Jan. 2019 - Note: JPL reports an approach uncertainty of +/- 3.746 days
Inside ten LD of Earth2 to 16 Jan. 2019
Data based onJPL SSD orbit solution #6 downloaded from JPL on 18 Oct. 2018 UTC (dated 6 April 2017 local)
based on 37 observations spanning 2013-2014
Optical observation  
    none recent
NotesNHATS target
previous observation Dec.-Jan. 2014
Links  
2013 VX4   -     departed
Approximate diameter62 meters (H=23.7)
Closest Earth approach3.49 LD at 1556 UTC on 11 Dec. 2018
Inside ten LD of Earth5 to 17 Dec. 2018
Data based onJPL SSD orbit solution #8 downloaded from JPL on 16 Dec. 2018 UTC
based on 50 observations spanning 2013-2018
Optical observation  
  • reported from 4 observing codes during 65.7924 days: 703, F52, G96, L01
  • first observed at 0826 UTC on 10 Oct. 2018 by Pan-STARRS 2
  • designation assigned to Catalina Sky Survey observation at 1201 UTC 14 Dec. 2018
  • last observed at 0327 UTC on 15 Dec. 2018 by Visnjan Obs.
Notesother ID: 2018 XM4
previous observation Oct.-Nov. 2013
Links  
2008 WD14   -     departed
Approximate diameter89 meters (H=22.9)
Closest Earth approach9.44 LD at 1005 UTC on 28 Nov. 2018
Inside ten LD of Earth26 to 29 Nov. 2018
Data based onJPL SSD orbit solution #27 downloaded from JPL on 11 Dec. 2018 UTC
based on 111 observations spanning 2008-2018
Optical observation  
  • reported from 2 observing codes during 13.1830 days: T05, T08
  • first observed at 0801 UTC on 27 Nov. 2018 by ATLAS Haleakala
  • last observed at 1225 UTC on 10 Dec. 2018 by ATLAS Haleakala
Notespotential mission destination
previous observation Nov.-Jan. 2009 and observation Aug. 2018
Links  
163899 2003 SD220   -   inbound
Approximate diameter1.17 k meters (H=17.3)
Closest Earth approach7.36 LD at 0103 UTC on 22 Dec. 2018
Inside ten LD of Earth17 to 26 Dec. 2018
Data based onJPL SSD orbit solution #98 downloaded from JPL on 17 Dec. 2018 UTC (dated 15 Dec. 2018 local)
based on 456 observations spanning 2000-2018 including radar
Optical observation  
  • reported from 9 observing codes during 52.2862 days: 118, 703, C23, C51, G40, K38, T05, T08, Z80
  • first observed at 2328 UTC on 7 Oct. 2018 by Northolt Branch Obs.
  • last observed at 0620 UTC on 29 Nov. 2018 by Tony Evans via Slooh.com Canary Islands Obs.
Radar observation  
  • observed 6 times from 2 locations during 111.8063 days
  • first observed at 1709 UTC on 25 Aug. 2018 by Arecibo
  • last observed at 1230 UTC on 15 Dec. 2018 by Goldstone DSS-14 70m antenna
Notesradar target, NHATS target, other ID: 2000 AD229
previous observation Sept.-Dec. 2009, observation Jan. 2012, observation Sept.-Dec. 2012, and observation Sept.-Dec. 2015
Links  
2001 XG1   -     departed
Approximate diameter74 meters (H=23.3)
Closest Earth approach7.84 LD at 0153 UTC on 10 Dec. 2018
Inside ten LD of Earth8 to 12 Dec. 2018
Data based onJPL SSD orbit solution #21 downloaded from JPL on 11 Dec. 2018 UTC
based on 105 observations spanning 2001-2018
Optical observation  
  • reported from 10 observing codes during 22.6630 days: 160, C95, G96, H36, I52, J95, L01, T05, T08, Z80
  • first observed at 0755 UTC on 17 Nov. 2018 by the Mt. Lemmon Survey
  • last observed at 2350 UTC on 9 Dec. 2018 by Northolt Branch Obs.
Links  

Footnotes

Illustration of ten lunar distances.

1. Ten lunar distances:  One "lunar distance" (LD) is the average distance between Earth and Moon (about 384,400 km., the same as 238,855 miles or 9.59 times around Earth's equator). Ten lunar distances has no special astronomical importance but is a useful giant traveling "bubble" within which to organize this special reporting. The approach of a small Solar-System body becomes more interesting when it nears or comes closer than 2.41 LD, as it encounters our planet's gravitational sphere of influence ( SOI). Earth's gravity can change the orbits of objects passing through its SOI. The Moon also has its own SOI, which changes as its distance from Earth varies, but never extends much more than 0.18 LD. (The simple illustration above, with Earth and Moon not to scale, shows the Earth SOI as a dotted vertical blue line.) The "Earth-Moon system" is generally defined as that region of space within a radius of one lunar distance from Earth, so an object can pass quite close to the Moon yet not be described as coming "inside" the E-M system.

2. Data credit:  All data on this page derived from orbit solutions comes from the NASA JPL Solar System Dynamics (SSD) Group through its Horizons system. All information about optical observations comes from the IAU Minor Planet Center (MPC) and info about radar observations comes from JPL SSD. The MPC, NASA, and JPL are not associated with this page or A/CC, and responsibility for the interpretation of this information and its use here rests entirely with A/CC. Important note: Approach times presented here as to-the-minute may have unstated uncertainties of a few minutes, or many minutes or even hours for objects with old or very short observation spans, which is significant because the Earth moves through its own diameter in about seven minutes. Thus actual encounter distances may vary, occasionally by as much as ten lunar distances. See JPL's Close Approach Tables for nominal vs. minimum possible passage distances and times, and for their note about uncertainties.

3. Size estimates:  Object diameters are rough approximations derived by standard formula from H, an object's "absolute magnitude" (brightness), where higher numbers represent dimmer (thus usually smaller) objects.