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Legend - object IDs plus links to more info

Data compiled at 1822 UTC on 11 Dec. 2017 for 34 known objects during a period of seven days from 8 to 14 Dec. 2017. White type highlights objects with just announced discovery, and orange is for objects with a new JPL orbit solution (usually from new observation).

Chart
ID

Full ID
Period
Closest
Passage
Uncertainty

Status
DR1092017 DR109164.5 LD+/- 30 minutesapproaching
VB496817 1989 VB105.23 LD  departed
VC2017 VC46.86 LD  departed
VD2017 VD239.45 LD  departed
VG12017 VG157.87 LD  departed
VJ2017 VJ112.05 LD  departed
VR122017 VR12117.4 LD+/- 20 minutesapproaching
VT142017 VT146.27 LD+/- 2 minutesapproaching
WA282017 WA2876.84 LD+/- one minute  departed
WB2017 WB46.30 LD  departed
WB282017 WB2865.16 LD+/- 3 minutes  departed
WE282017 WE2829.61 LD  departed
WF162017 WF168.96 LD  departed
WH22017 WH229.18 LD  departed
WJ132017 WJ1362.66 LD  departed
WJ162017 WJ1628.68 LD  departed
WK152017 WK1516.40 LD  departed
WK162017 WK16110.27 LD  departed
WL152017 WL1572.21 LD  departed
WL282017 WL2822.83 LD  departed
WM612008 WM616.82 LDoutbound
WN152017 WN1539.42 LD  departed
WO152017 WO1552.39 LD+/- 3 minutes  departed
WS132017 WS1311.30 LD  departed
WT282017 WT2812.58 LD  departed
WV122017 WV123.43 LDoutbound
WY272017 WY2731.74 LD+/- 2 minutes  departed
WZ142017 WZ1413.31 LD+/- 2 minutesapproaching
XE2017 XE3.97 LDoutbound
XE12017 XE117.68 LD  departed
XK12017 XK16.24 LDapproaching
XS2017 XS7.39 LDoutbound
XX1692015 XX1699.71 LDapproaching
XY2006 XY3.35 LDinbound
DateTfc.Time
8 Dec. '17Rept. Line
9 Dec. '17Rept. Line
10 Dec. '17Rept. Line
11 Dec. '17Rept. Line
12 Dec. '17Rept. Line
13 Dec. '17 Line
14 Dec. '17 Line

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

2017 XK1   -   approaching
Approximate diameter31 meters (H=25.207)
Closest Earth approach6.15 LD at 0754 UT on 15 Dec. 2017
Inside ten LD of Earth12 to 18 Dec. 2017
Data based onJPL SSD orbit solution #2 downloaded from JPL on 11 Dec. 2017 UTC
based on 38 observations spanning 4 days
Optical observation  
  • reported from 9 observing codes during 3.7508 days: 104, 204, F51, G96, H01, H21, H36, I52, L01
  • first observed at 0824 UT on 7 Dec. 2017 by Pan-STARRS 1
  • designation assigned to Mt. Lemmon Survey observation at 0545 UT 9 Dec. 2017
  • last observed at 0226 UT on 11 Dec. 2017 by ARO Westfield
Links  
2017 XE1   -     departed
Approximate diameter22 meters (H=25.926)
Closest Earth approach7.81 LD at 1346 UT on 4 Dec. 2017
Inside ten LD of Earth3 to 5 Dec. 2017
Data based onJPL SSD orbit solution #1 downloaded from JPL on 11 Dec. 2017 UTC
based on 21 observations spanning 2 days
Optical observation  
  • reported from 6 observing codes during 1.9056 days: 291, 926, F51, H01, I52, J95
  • designation assigned to Pan-STARRS 1 observation at 0657 UT 8 Dec. 2017
  • last observed at 0441 UT on 10 Dec. 2017 by the Spacewatch 1.8m telescope
Links  
2017 XS   -   outbound
Approximate diameter97 meters (H=22.709)
Closest Earth approach7.39 LD at 0428 UT on 8 Dec. 2017
Inside ten LD of Earth5 to 11 Dec. 2017
Data based onJPL SSD orbit solution #3 downloaded from JPL on 11 Dec. 2017 UTC
based on 165 observations spanning 4 days
Optical observation  
  • reported from 23 observing codes during 3.6114 days: 160, 718, 926, C47, E23, G34, G48, H06, H21, H36, H45, I52, I89, J69, J95, K41, K88, L04, L18, L23, T08, W88, Z80
  • designation assigned to ATLAS Mauna Loa observation at 1328 UT 7 Dec. 2017
  • last observed at 0408 UT on 11 Dec. 2017 by Petit Jean Mtn. South Obs.
Links  
2017 XE   -   outbound
Approximate diameter19 meters (H=26.206)
Closest Earth approach3.97 LD at 2320 UT on 7 Dec. 2017
Inside ten LD of Earth1 to 14 Dec. 2017
Data based onJPL SSD orbit solution #2 downloaded from JPL on 9 Dec. 2017 UTC
based on 129 observations spanning one day
Optical observation  
  • reported from 20 observing codes during 1.6430 days: 113, 204, 246, 703, 718, 926, C43, C47, C77, G34, G96, H01, H21, I52, J69, J95, K88, L04, L18, Z80
  • designation assigned to Mt. Lemmon Survey observation at 0400 UT 7 Dec. 2017
  • last observed at 1926 UT on 8 Dec. 2017 by QOS Obs.
NotesNHATS target
Links  
2017 WT28   -     departed
Approximate diameter8 meters (H=28.061)
Closest Earth approach1.39 LD at 1045 UT on 25 Nov. 2017
Inside Earth SOI23 to 27 Nov. 2017
Inside ten LD of Earth15 Nov. until 5 Dec. 2017
Closest Moon approach2.33 LD at 0256 UT on 26 Nov. 2017
Data based onJPL SSD orbit solution #2 downloaded from JPL on 7 Dec. 2017 UTC
based on 19 observations spanning 9 days
Optical observation  
Notesrisk, NHATS target
Links  
2017 WL28   -     departed
Approximate diameter10 meters (H=27.614)
Closest Earth approach1.68 LD at 2159 UT on 24 Nov. 2017
Inside Earth SOI23 to 25 Nov. 2017
Inside ten LD of Earth19 to 30 Nov. 2017
Closest Moon approach2.05 LD at 1113 UT on 24 Nov. 2017
Data based onJPL SSD orbit solution #1 downloaded from JPL on 30 Nov. 2017 UTC
based on 22 observations spanning 3 days
Optical observation  
  • reported from 4 observing codes during 2.9356 days: F51, G96, I52, V06
  • first observed at 1422 UT on 25 Nov. 2017 by Pan-STARRS 1
  • designation assigned to Mt. Lemmon Survey observation at 1004 UT 27 Nov. 2017
  • last observed at 1249 UT on 28 Nov. 2017 by the Mt. Lemmon Survey
Links  
2017 WE28   -     departed
Approximate diameter15 meters (H=26.746)
Closest Earth approach5.75 LD at 0443 UT on 24 Nov. 2017
Inside ten LD of Earth20 to 28 Nov. 2017
Data based onJPL SSD orbit solution #3 downloaded from JPL on 11 Dec. 2017 UTC
based on 28 observations spanning 14 days
Optical observation  
  • reported from 7 observing codes during 13.9368 days: 309, 695, 926, G96, H01, K51, V06
  • designation assigned to Mt. Lemmon Survey observation at 0301 UT 27 Nov. 2017
  • last observed at 0130 UT on 11 Dec. 2017 by Marco Micheli via Cerro Paranal
Notesrisk, NHATS target
Links  
2017 WB28   -     departed
Approximate diameter19 meters (H=26.212)
Closest Earth approach6.40 LD at 1220 UT on 20 Nov. 2017 - Note: JPL reports an approach uncertainty of +/- 3 minutes
Inside ten LD of Earth18 to 22 Nov. 2017
Data based onJPL SSD orbit solution #1 downloaded from JPL on 28 Nov. 2017 UTC
based on 26 observations spanning 2 days
Optical observation  
  • reported from 5 observing codes during 2.1043 days: 926, G96, H01, I52, V06
  • designation assigned to Mt. Lemmon Survey observation at 0652 UT 26 Nov. 2017
  • last observed at 0922 UT on 28 Nov. 2017 by the Mt. Lemmon Survey
Links  
2017 WA28   -     departed
Approximate diameter17 meters (H=26.451)
Closest Earth approach8.99 LD at 0655 UT on 22 Nov. 2017
Inside ten LD of Earth21 to 23 Nov. 2017
Data based onJPL SSD orbit solution #1 downloaded from JPL on 28 Nov. 2017 UTC
based on 26 observations spanning 2 days
Optical observation  
  • reported from 5 observing codes during 1.9926 days: 926, G96, H01, I52, V06
  • designation assigned to Mt. Lemmon Survey observation at 0651 UT 26 Nov. 2017
  • last observed at 0641 UT on 28 Nov. 2017 by the Catalina Sky Survey Kuiper Telescope
Links  
2017 WY27   -     departed
Approximate diameter9 meters (H=27.888)
Closest Earth approach3.65 LD at 1138 UT on 21 Nov. 2017 - Note: JPL reports an approach uncertainty of +/- 2 minutes
Inside ten LD of Earth16 to 26 Nov. 2017
Data based onJPL SSD orbit solution #1 downloaded from JPL on 28 Nov. 2017 UTC
based on 32 observations spanning 2 days
Optical observation  
  • reported from 7 observing codes during 2.0049 days: 926, G96, H01, H21, I52, K51, V06
  • designation assigned to Mt. Lemmon Survey observation at 0543 UT 26 Nov. 2017
  • last observed at 0550 UT on 28 Nov. 2017 by the Catalina Sky Survey Kuiper Telescope
Notesrisk, NHATS target
Links  
2017 WK16   -     departed
Approximate diameter22 meters (H=25.985)
Closest Earth approach7.85 LD at 0603 UT on 22 Nov. 2017
Inside ten LD of Earth21 to 23 Nov. 2017
Data based onJPL SSD orbit solution #1 downloaded from JPL on 27 Nov. 2017 UTC
based on 23 observations spanning 2 days
Optical observation  
  • reported from 4 observing codes during 2.0212 days: G96, H01, H21, I52
  • designation assigned to Mt. Lemmon Survey observation at 0452 UT 25 Nov. 2017
  • last observed at 0522 UT on 27 Nov. 2017 by Magdalena Ridge Obs.
Links  
2017 WJ16   -     departed
Approximate diameter45 meters (H=24.404)
Closest Earth approach7.73 LD at 1421 UT on 13 Nov. 2017
Inside ten LD of Earth8 to 19 Nov. 2017
Data based onJPL SSD orbit solution #2 downloaded from JPL on 7 Dec. 2017 UTC
based on 35 observations spanning 12 days
Optical observation  
  • reported from 7 observing codes during 12.1754 days: 291, 807, G96, H01, I52, J95, V06
  • designation assigned to Mt. Lemmon Survey observation at 0130 UT 25 Nov. 2017
  • last observed at 0543 UT on 7 Dec. 2017 by the Spacewatch 1.8m telescope
NotesNHATS target
Links  
2017 WF16   -     departed
Approximate diameter6 meters (H=28.835)
Closest Earth approach3.72 LD at 0346 UT on 29 Nov. 2017
Inside ten LD of Earth19 Nov. until 9 Dec. 2017
Data based onJPL SSD orbit solution #1 downloaded from JPL on 27 Nov. 2017 UTC
based on 38 observations spanning one day
Optical observation  
  • reported from 7 observing codes during 1.1344 days: 033, 926, G96, H01, H21, I52, V06
  • designation assigned to Mt. Lemmon Survey observation at 0622 UT 26 Nov. 2017
  • last observed at 0935 UT on 27 Nov. 2017 by the Catalina Sky Survey Kuiper Telescope
NotesNHATS target
Links  
2017 WO15   -     departed
Approximate diameter17 meters (H=26.472)
Closest Earth approach3.51 LD at 0404 UT on 20 Nov. 2017 - Note: JPL reports an approach uncertainty of +/- 3 minutes
Inside ten LD of Earth16 to 23 Nov. 2017
Data based onJPL SSD orbit solution #1 downloaded from JPL on 27 Nov. 2017 UTC
based on 28 observations spanning 2 days
Optical observation  
  • reported from 6 observing codes during 1.9088 days: 033, 926, G96, H01, I52, V06
  • designation assigned to Mt. Lemmon Survey observation at 1028 UT 24 Nov. 2017
  • last observed at 0816 UT on 26 Nov. 2017 by Steward Obs. Mt. Lemmon Station
Links  
2017 WN15   -     departed
Approximate diameter36 meters (H=24.85)
Closest Earth approach7.37 LD at 0403 UT on 29 Nov. 2017
Inside ten LD of Earth27 to 30 Nov. 2017
Data based onJPL SSD orbit solution #1 downloaded from JPL on 27 Nov. 2017 UTC
based on 38 observations spanning 2 days
Optical observation  
  • reported from 9 observing codes during 2.5529 days: 033, 160, 595, 703, 926, G96, I52, J95, V06
  • designation assigned to Mt. Lemmon Survey observation at 1024 UT 24 Nov. 2017
  • last observed at 2340 UT on 26 Nov. 2017 by Castelmartini Obs.
Links  
2017 WL15   -     departed
Approximate diameter23 meters (H=25.823)
Closest Earth approach9.48 LD at 1215 UT on 20 Nov. 2017
Inside ten LD of Earth19 to 21 Nov. 2017
Data based onJPL SSD orbit solution #1 downloaded from JPL on 27 Nov. 2017 UTC
based on 32 observations spanning 2 days
Optical observation  
  • reported from 6 observing codes during 1.9276 days: 291, G96, H01, I52, J95, V06
  • designation assigned to Mt. Lemmon Survey observation at 0925 UT 24 Nov. 2017
  • last observed at 0741 UT on 26 Nov. 2017 by the Catalina Sky Survey Kuiper Telescope
Notesrisk
Links  
2017 WK15   -     departed
Approximate diameter15 meters (H=26.735)
Closest Earth approach8.73 LD at 0342 UT on 27 Nov. 2017
Inside ten LD of Earth23 to 30 Nov. 2017
Data based onJPL SSD orbit solution #2 downloaded from JPL on 29 Nov. 2017 UTC
based on 33 observations spanning 4 days
Optical observation  
  • reported from 9 observing codes during 4.0611 days: 033, 104, 203, 595, 926, F51, H01, I52, J95
  • designation assigned to Pan-STARRS 1 observation at 0918 UT 24 Nov. 2017
  • last observed at 1046 UT on 28 Nov. 2017 by Steward Obs. Mt. Lemmon Station
NotesNHATS target
Links  
2017 WZ14   -   approaching
Approximate diameter31 meters (H=25.171)
Closest Earth approach7.61 LD at 2115 UT on 24 Dec. 2017 - Note: JPL reports an approach uncertainty of +/- 2 minutes
Inside ten LD of Earth18 to 30 Dec. 2017
Data based onJPL SSD orbit solution #2 downloaded from JPL on 9 Dec. 2017 UTC
based on 12 observations spanning 16 days
Optical observation  
  • reported from 4 observing codes during 16.0680 days: 291, 568, F51, H01
  • designation assigned to Pan-STARRS 1 observation at 1140 UT 22 Nov. 2017
  • last observed at 1318 UT on 8 Dec. 2017 by the Spacewatch 1.8m telescope
Notesradar target, NHATS target
Links  
2017 WS13   -     departed
Approximate diameter40 meters (H=24.649)
Closest Earth approach9.45 LD at 1336 UT on 5 Dec. 2017
Inside ten LD of Earth4 to 6 Dec. 2017
Data based onJPL SSD orbit solution #3 downloaded from JPL on 29 Nov. 2017 UTC
based on 48 observations spanning 8 days
Optical observation  
  • reported from 7 observing codes during 7.7938 days: 807, 926, G96, H01, H21, H36, I52
  • first observed at 0551 UT on 20 Nov. 2017 by the Mt. Lemmon Survey
  • designation assigned to Mt. Lemmon Survey observation at 0829 UT 20 Nov. 2017
  • last observed at 0054 UT on 28 Nov. 2017 by Robert Holmes via Cerro Tololo Inter-American Obs.
Links  
2017 WJ13   -     departed
Approximate diameter105 meters (H=22.547)
Closest Earth approach6.10 LD at 1748 UT on 12 Nov. 2017
Inside ten LD of Earth9 to 15 Nov. 2017
Data based onJPL SSD orbit solution #4 downloaded from JPL on 9 Dec. 2017 UTC
based on 46 observations spanning 17 days
Optical observation  
  • reported from 10 observing codes during 16.8771 days: 246, 291, 807, 926, D29, E10, E23, H36, H45, T08
  • designation assigned to ATLAS Mauna Loa observation at 1238 UT 22 Nov. 2017
  • last observed at 0941 UT on 9 Dec. 2017 by the Spacewatch 1.8m telescope
Links  
2017 WV12   -   outbound
Approximate diameter26 meters (H=25.582)
Closest Earth approach3.43 LD at 2141 UT on 9 Dec. 2017
Inside ten LD of Earth5 to 13 Dec. 2017
Data based onJPL SSD orbit solution #7 downloaded from JPL on 11 Dec. 2017 UTC
based on 35 observations spanning 19 days
Optical observation  
  • reported from 7 observing codes during 18.8371 days: 203, 691, 926, F51, H21, I52, T08
  • designation assigned to Pan-STARRS 1 observation at 0806 UT 19 Nov. 2017
  • last observed at 0411 UT on 8 Dec. 2017 by Tenagra II Obs.
Links  
2017 WH2   -     departed
Approximate diameter46 meters (H=24.348)
Closest Earth approach6.39 LD at 1101 UT on 30 Nov. 2017
Inside ten LD of Earth28 Nov. until 2 Dec. 2017
Data based onJPL SSD orbit solution #7 downloaded from JPL on 3 Dec. 2017 UTC
based on 36 observations spanning 12 days
Optical observation  
  • reported from 7 observing codes during 11.7381 days: 160, 691, 926, F51, G96, J95, V06
  • designation assigned to Pan-STARRS 1 observation at 1032 UT 18 Nov. 2017
  • last observed at 0414 UT on 30 Nov. 2017 by Great Shefford Obs.
Links  
2017 WB   -     departed
Approximate diameter30 meters (H=25.276)
Closest Earth approach7.36 LD at 1939 UT on 15 Nov. 2017
Inside ten LD of Earth12 to 19 Nov. 2017
Data based onJPL SSD orbit solution #8 downloaded from JPL on 11 Dec. 2017 UTC
based on 92 observations spanning 24 days
Optical observation  
  • reported from 12 observing codes during 24.0695 days: 104, 474, 595, 703, 807, 926, G96, H21, I52, J04, J95, K51
  • designation assigned to Catalina Sky Survey observation at 0453 UT 16 Nov. 2017
  • last observed at 0633 UT on 10 Dec. 2017 by ARO Westfield
Links  
2017 VT14   -   approaching
Approximate diameter100 meters (H=22.641)
Closest Earth approach3.83 LD at 0154 UT on 17 Dec. 2017 - Note: JPL reports an approach uncertainty of +/- 2 minutes
Inside ten LD of Earth13 to 21 Dec. 2017
Data based onJPL SSD orbit solution #6 downloaded from JPL on 7 Dec. 2017 UTC
based on 35 observations spanning 24 days
Optical observation  
  • reported from 6 observing codes during 23.3385 days: 291, 587, 691, 926, C51, J04
  • designation assigned to WISE observation at 1821 UT 13 Nov. 2017
  • last observed at 0229 UT on 7 Dec. 2017 by the Spacewatch 0.9m telescope
Notesradar target
Links  
2017 VR12   -   approaching
Approximate diameter266 meters (H=20.524)
Closest Earth approach3.75 LD at 0728 UT on 7 March 2018 - Note: JPL reports an approach uncertainty of +/- 20 minutes
Inside ten LD of Earth28 Feb. until 13 March 2018
Data based onJPL SSD orbit solution #11 downloaded from JPL on 9 Dec. 2017 UTC
based on 71 observations spanning 28 days
Optical observation  
  • reported from 10 observing codes during 27.9902 days: 033, 291, 711, F51, G96, H01, H21, I52, J04, V06
  • designation assigned to Pan-STARRS 1 observation at 1357 UT 10 Nov. 2017
  • last observed at 1343 UT on 8 Dec. 2017 by Pan-STARRS 1
Notesradar target, NHATS target
Links  
2017 VG1   -     departed
Approximate diameter51 meters (H=24.127)
Closest Earth approach7.72 LD at 1317 UT on 4 Nov. 2017
Inside ten LD of Earth31 Oct. until 8 Nov. 2017
Data based onJPL SSD orbit solution #14 downloaded from JPL on 7 Dec. 2017 UTC
based on 100 observations spanning 32 days
Optical observation  
  • reported from 18 observing codes during 31.6220 days: 203, 204, 691, 703, 711, 807, 850, 926, F51, G96, H21, I52, J22, K63, T05, T08, W25, W88
  • designation assigned to ATLAS Mauna Loa observation at 1331 UT 5 Nov. 2017
  • last observed at 0427 UT on 7 Dec. 2017 by Robert Holmes via Cerro Tololo Inter-American Obs.
NotesNHATS target
Links  
2017 VJ   -     departed
Approximate diameter42 meters (H=24.55)
Closest Earth approach2.30 LD at 1725 UT on 30 Oct. 2017
Inside Earth SOIduring 30 Oct. 2017
Inside ten LD of Earth27 Oct. until 3 Nov. 2017
Data based onJPL SSD orbit solution #13 downloaded from JPL on 8 Dec. 2017 UTC
based on 55 observations spanning 33 days
Optical observation  
  • reported from 14 observing codes during 32.9017 days: 204, 291, 474, 691, 695, 807, 926, E23, G96, H21, I52, J04, J95, T05
  • designation assigned to ATLAS Haleakala observation at 0951 UT 5 Nov. 2017
  • last observed at 0729 UT on 8 Dec. 2017 by Spacewatch via Kitt Peak Natl. Obs.
Notesrisk
Links  
2017 VD   -     departed
Approximate diameter232 meters (H=20.818)
Closest Earth approach9.91 LD at 0109 UT on 2 Nov. 2017
Inside ten LD of Earth1 to 2 Nov. 2017
Data based onJPL SSD orbit solution #16 downloaded from JPL on 11 Dec. 2017 UTC
based on 181 observations spanning 36 days
Optical observation  
  • reported from 26 observing codes during 35.7628 days: 204, 246, 703, 807, 926, 970, B49, C23, C95, C97, F51, G48, G96, H06, H15, H21, I52, I89, J43, J69, J95, K05, L04, T05, T08, Z80
  • designation assigned to ATLAS Mauna Loa observation at 0837 UT 4 Nov. 2017
  • last observed at 0255 UT on 10 Dec. 2017 by ARO Westfield
Links  
2017 VC   -     departed
Approximate diameter73 meters (H=23.327)
Closest Earth approach9.90 LD at 2257 UT on 10 Nov. 2017
Inside ten LD of Earth10 to 11 Nov. 2017
Data based onJPL SSD orbit solution #16 downloaded from JPL on 11 Dec. 2017 UTC
based on 122 observations spanning 38 days
Optical observation  
  • reported from 20 observing codes during 38.0384 days: 204, 246, 695, 807, 926, A17, A53, C97, F51, G34, G96, H21, H45, I76, J22, J95, L04, T05, T08, Z80
  • designation assigned to Pan-STARRS 1 observation at 0640 UT 2 Nov. 2017
  • last observed at 0735 UT on 10 Dec. 2017 by ARO Westfield
Links  
2017 DR109   -   approaching
Approximate diameter10 meters (H=27.6)
Closest Earth approach3.69 LD at 0517 UT on 24 Feb. 2018 - Note: JPL reports an approach uncertainty of +/- 30 minutes
Inside ten LD of Earth18 Feb. until 1 March 2018
Data based onJPL SSD orbit solution #2 downloaded from JPL on 18 Nov. 2017 UTC (dated 6 April 2017 local)
based on 29 observations spanning 5 days
Optical observation  
    none recent
NotesNHATS target
previous passage Feb. 2016 at 7.7 LD +/- 32 mins. uncertainty (unobserved) and passage Feb. 2017 at 2.32 LD
Links  
2015 XX169   -   approaching
Approximate diameter11 meters (H=27.5)
Closest Earth approach9.71 LD at 0006 UT on 14 Dec. 2017
Inside ten LD of Earth12 to 15 Dec. 2017
Data based onJPL SSD orbit solution #8 downloaded from JPL on 8 Dec. 2017 UTC
based on 54 observations spanning 2015-2017
Optical observation  
  • reported from one observing code during 0.139 hours: I52
  • first observed at 0436 UT on 8 Dec. 2017 by Steward Obs. Mt. Lemmon Station
  • last observed at 0444 UT on 8 Dec. 2017 by Steward Obs. Mt. Lemmon Station
NotesNHATS target
previous passage Dec. 2015 at 8.41 LD and passage Dec. 2016 at 7.47 LD
Links  
2008 WM61   -   outbound
Approximate diameter15 meters (H=26.7)
Closest Earth approach3.67 LD at 1152 UT on 2 Dec. 2017
Inside ten LD of Earth23 Nov. until 11 Dec. 2017
Data based onJPL SSD orbit solution #15 downloaded from JPL on 25 Nov. 2017 UTC
based on 75 observations spanning 2008-2017
Optical observation  
  • reported from 3 observing codes during 24.226 hours: 291, G96, J95
  • first observed at 0321 UT on 24 Nov. 2017 by the Mt. Lemmon Survey
  • last observed at 0335 UT on 25 Nov. 2017 by the Mt. Lemmon Survey
NotesNHATS target
previous passage Nov. 2008 at 3.51 LD
Links  
2006 XY   -   inbound
Approximate diameter54 meters (H=24.)
Closest Earth approach3.35 LD at 1249 UT on 14 Dec. 2017
Inside ten LD of Earth5 to 23 Dec. 2017
Data based onJPL SSD orbit solution #18 downloaded from JPL on 9 Dec. 2017 UTC
based on 111 observations spanning 2006-2017
Optical observation  
  • reported from 7 observing codes during 12.1133 days: 691, 703, 926, G96, H21, I52, V06
  • first observed at 0231 UT on 26 Nov. 2017 by the Mt. Lemmon Survey
  • last observed at 0514 UT on 8 Dec. 2017 by the Catalina Sky Survey
NotesNHATS target
previous passage Dec. 2006 at 4.8 LD
Links  
496817 1989 VB   -     departed
Approximate diameter389 meters (H=19.7)
Closest Earth approach7.87 LD at 2001 UT on 29 Sept. 2017
Inside ten LD of Earth25 Sept. until 4 Oct. 2017
Data based onJPL SSD orbit solution #61 downloaded from JPL on 8 Dec. 2017 UTC
based on 260 observations spanning 1989-2017 including radar
Optical observation  
  • reported from 17 observing codes during 146.7228 days: 160, 926, C51, D29, F65, G40, H15, H45, I39, Q62, Q68, T05, T08, W34, W88, Y00, Z80
  • first observed at 0043 UT on 14 July 2017 by SONEAR
  • last observed at 1804 UT on 7 Dec. 2017 by Purple Mtn. Obs. Xuyi Station
Radar observation  
  • observed 6 times from one location during 7.0347 days
  • first observed at 1020 UT on 3 Oct. 2017 by Goldstone DSS-14 70m antenna
  • last observed at 1110 UT on 10 Oct. 2017 by Goldstone DSS-14 70m antenna
Notesradar target
previous observation Oct.-Jan. 2013 and observation April 2014
Links  

Footnotes

Illustration of ten lunar distances.

1. Ten lunar distances:  A "lunar distance" (LD) is the average distance between Earth and Moon (about 384,400 km., the same as 238,855 miles or nearly ten [9.59] times around Earth's equator). Ten lunar distances has no special astronomical importance but is a useful arbitrary "bubble" within which to organize this reporting. An approach by a small Solar-System body starts to become interesting at less than four LD out from Earth as it encounters our planet's "Hill sphere" (distance indicated by the blue line in this illustration at about 3.9 LD). This is a region within which Earth's gravitational influence can change the orbits of passing objects. The Moon also has a Hill sphere, outlined here as a gray circle. (Earth and Moon are not shown to scale.) 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 very 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.