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Legend - object IDs plus links to more info

Data compiled at 1847 UTC on 15 Sept. 2019 for 29 known objects during a period of seven days from 12 to 18 Sept. 2019. Orange is for objects with a new JPL orbit solution (usually from new observation).

Chart
ID

Full ID
Period
Closest
Passage
Uncertainty

Status
KP272017 KP279.27 LD+/- one minuteapproaching
PO12019 PO128.18 LD+/- 3 minutes  departed
QE2019 QE44.49 LD  departed
QE72019 QE747.1 LD+/- 13 minutes  departed
QL72019 QL754.9 LD+/- 8 minutes  departed
QU32019 QU327.07 LD  departed
QY42019 QY44.22 LDoutbound
QZ32019 QZ310.60 LD  departed
RA2019 RA7.54 LD  departed
RB22019 RB211.29 LD  departed
RC12019 RC120.77 LD  departed intruder
RD12019 RD111.24 LD+/- 3 minutes  departed
RE12019 RE116.80 LD+/- 3 minutes  departed
RF12019 RF110.71 LD  departed
RG22019 RG210.95 LD  departed Moon buzzer
RH2019 RH9.31 LD  departed
RM12019 RM113.19 LD+/- 6 minutes  departed
RO12019 RO126.10 LD  departed
RP2019 RP25.41 LD+/- one minute  departed
RP12019 RP134.89 LD  departed intruder
RP22019 RP28.5 LD+/- 41 minutesinbound
RQ2019 RQ27.27 LD  departed intruder
RQ22019 RQ29.33 LDoutbound
RR22019 RR216.63 LD+/- 2 minutes  departed
RT32019 RT35.01 LDoutbound
RW12019 RW117.59 LD+/- 4 minutes  departed
RX12019 RX113.01 LD  departed
RX22019 RX27.19 LDoutbound
SL162017 SL168.47 LDapproaching
DateTfc.Time
12 Sept. '19Rept. Line
13 Sept. '19Rept. Line
14 Sept. '19Rept. Line
15 Sept. '19Rept. Line
16 Sept. '19Rept. Line
17 Sept. '19 Line
18 Sept. '19 Line

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

2019 RT3   -   outbound
Approximate diameter32 meters (H=25.094)
Closest Earth approach1.45 LD at 0410 UTC on 9 Sept. 2019
Inside Earth SOI8 to 10 Sept. 2019
Inside ten LD of Earth3 to 15 Sept. 2019
Closest Moon approach2.21 LD at 2139 UTC on 8 Sept. 2019
Data based onJPL SSD orbit solution #3 downloaded from JPL on 15 Sept. 2019 UTC
based on 73 observations spanning 4 days
Optical observation  
  • reported from 16 observing codes during 3.5217 days: 203, 204, 595, 850, A17, A44, G40, H21, J95, K38, K87, K88, L01, L34, T08, W34
  • designation assigned to ATLAS Mauna Loa observation at 1429 UTC 11 Sept. 2019
  • last observed at 0300 UTC on 15 Sept. 2019 by Dettelbach Vineyard Obs.
Notesrisk
Links  
2019 RX2   -   outbound
Approximate diameter7 meters (H=28.395)
Closest Earth approach7.19 LD at 0318 UTC on 12 Sept. 2019
Inside ten LD of Earth6 to 17 Sept. 2019
Data based onJPL SSD orbit solution #1 downloaded from JPL on 10 Sept. 2019 UTC
based on 18 observations spanning 3 days
Optical observation  
  • reported from 4 observing codes during 3.3970 days: F51, G96, I52, L01
  • first observed at 1000 UTC on 6 Sept. 2019 by Pan-STARRS 1
  • designation assigned to Mt. Lemmon Survey observation at 0620 UTC 7 Sept. 2019
  • last observed at 1932 UTC on 9 Sept. 2019 by Visnjan Obs.
Links  
2019 RR2   -     departed
Approximate diameter16 meters (H=26.584)
Closest Earth approach4.93 LD at 0457 UTC on 31 Aug. 2019 - Note: JPL reports an approach uncertainty of +/- 2 minutes
Inside ten LD of Earth24 Aug. until 6 Sept. 2019
Data based onJPL SSD orbit solution #1 downloaded from JPL on 9 Sept. 2019 UTC
based on 14 observations spanning 3 days
Optical observation  
  • reported from 3 observing codes during 2.9673 days: 568, F51, L01
  • first observed at 1208 UTC on 6 Sept. 2019 by Pan-STARRS 1
  • designation assigned to Pan-STARRS 1 observation at 1223 UTC 6 Sept. 2019
  • last observed at 1121 UTC on 9 Sept. 2019 by R. Wainscoat via Mauna Kea
Links  
2019 RQ2   -   outbound
Approximate diameter28 meters (H=25.415)
Closest Earth approach9.33 LD at 1711 UTC on 14 Sept. 2019
Inside ten LD of Earth13 to 15 Sept. 2019
Data based onJPL SSD orbit solution #3 downloaded from JPL on 14 Sept. 2019 UTC
based on 32 observations spanning 9 days
Optical observation  
  • reported from 8 observing codes during 8.7115 days: 474, 568, F51, G96, H21, I52, I93, J95
  • first observed at 0800 UTC on 5 Sept. 2019 by the Mt. Lemmon Survey
  • designation assigned to Pan-STARRS 1 observation at 1104 UTC 6 Sept. 2019
  • last observed at 0104 UTC on 14 Sept. 2019 by Great Shefford Obs.
Notesrisk
Links  
2019 RP2   -   inbound
Approximate diameter6 meters (H=28.939)
Closest Earth approach8.45 LD at 1219 UTC on 20 Sept. 2019 - Note: JPL reports an approach uncertainty of +/- 41 minutes
Inside ten LD of Earth7 Sept. until 4 Oct. 2019
Data based onJPL SSD orbit solution #1 downloaded from JPL on 9 Sept. 2019 UTC
based on 13 observations spanning 3 days
Optical observation  
  • reported from 2 observing codes during 2.9526 days: 568, F51
  • designation assigned to Pan-STARRS 1 observation at 1002 UTC 6 Sept. 2019
  • last observed at 0854 UTC on 9 Sept. 2019 by R. Wainscoat via Mauna Kea
Links  
2019 RG2   -     departed Moon buzzer
Approximate diameter11 meters (H=27.373)
Closest Earth approach1.36 LD at 1911 UTC on 9 Sept. 2019
Inside Earth SOI9 to 10 Sept. 2019
Inside ten LD of Earth7 to 11 Sept. 2019
Closest Moon approach0.55 LD at 1611 UTC on 9 Sept. 2019
Inside one LD of Moon1218-2005 UTC on 9 Sept. 2019
Data based onJPL SSD orbit solution #1 downloaded from JPL on 9 Sept. 2019 UTC
based on 24 observations spanning one day
Optical observation  
  • reported from 6 observing codes during 1.2490 days: 807, 850, E23, G96, I52, J95
  • designation assigned to Mt. Lemmon Survey observation at 0747 UTC 7 Sept. 2019
  • last observed at 1345 UTC on 8 Sept. 2019 by Arcadia Obs.
Links  
2019 RB2   -     departed
Approximate diameter10 meters (H=27.686)
Closest Earth approach1.11 LD at 0613 UTC on 4 Sept. 2019
Inside Earth SOI2 to 5 Sept. 2019
Inside ten LD of Earth28 Aug. until 11 Sept. 2019
Closest Moon approach1.43 LD at 1704 UTC on 3 Sept. 2019
Data based onJPL SSD orbit solution #1 downloaded from JPL on 9 Sept. 2019 UTC
based on 18 observations spanning 2 days
Optical observation  
  • reported from 5 observing codes during 1.9875 days: 703, 734, H21, I52, L01
  • designation assigned to Catalina Sky Survey observation at 0944 UTC 5 Sept. 2019
  • last observed at 0926 UTC on 7 Sept. 2019 by ARO Westfield
Links  
2019 RX1   -     departed
Approximate diameter28 meters (H=25.401)
Closest Earth approach9.68 LD at 0209 UTC on 9 Sept. 2019
Inside ten LD of Earth8 to 9 Sept. 2019
Data based onJPL SSD orbit solution #3 downloaded from JPL on 11 Sept. 2019 UTC
based on 57 observations spanning 3 days
Optical observation  
  • reported from 11 observing codes during 2.7053 days: 703, 711, 850, G96, H01, H21, I52, I93, J95, L01, W34
  • designation assigned to Mt. Lemmon Survey observation at 0910 UTC 5 Sept. 2019
  • last observed at 0206 UTC on 8 Sept. 2019 by Great Shefford Obs.
Notesrisk
Links  
2019 RW1   -     departed
Approximate diameter39 meters (H=24.721)
Closest Earth approach7.13 LD at 2309 UTC on 27 Aug. 2019 - Note: JPL reports an approach uncertainty of +/- 4 minutes
Inside ten LD of Earth21 Aug. until 3 Sept. 2019
Data based onJPL SSD orbit solution #2 downloaded from JPL on 15 Sept. 2019 UTC
based on 26 observations spanning 8 days
Optical observation  
  • reported from 7 observing codes during 7.6467 days: 204, 595, 703, H21, I52, I93, L01
  • designation assigned to Catalina Sky Survey observation at 1013 UTC 5 Sept. 2019
  • last observed at 0145 UTC on 13 Sept. 2019 by Schiaparelli Obs.
Links  
2019 RP1   -     departed intruder
Approximate diameter9 meters (H=27.779)
Closest Earth approach0.10 LD at 2203 UTC on 5 Sept. 2019
Inside Earth-Moon system1753 on 5 Sept. until 0212 UTC on 6 Sept. 2019
Inside Earth SOI5 to 6 Sept. 2019
Inside ten LD of Earth4 to 7 Sept. 2019
Closest Moon approach0.85 LD at 2323 UTC on 5 Sept. 2019
Inside one LD of Moon2113 on 5 Sept. until 0136 UTC on 6 Sept. 2019
Data based onJPL SSD orbit solution #2 downloaded from JPL on 7 Sept. 2019 UTC
based on 28 observations spanning one day
Optical observation  
  • reported from 8 observing codes during 23.971 hours: 595, 703, 711, H01, H21, I93, J95, L01
  • designation assigned to Catalina Sky Survey observation at 0531 UTC 6 Sept. 2019
  • last observed at 0529 UTC on 7 Sept. 2019 by McDonald Obs.
Links  
2019 RO1   -     departed
Approximate diameter15 meters (H=26.816)
Closest Earth approach7.29 LD at 0133 UTC on 4 Sept. 2019
Inside ten LD of Earth1 to 6 Sept. 2019
Data based onJPL SSD orbit solution #1 downloaded from JPL on 7 Sept. 2019 UTC
based on 13 observations spanning 2 days
Optical observation  
  • reported from 4 observing codes during 1.6194 days: G96, H21, I52, L01
  • designation assigned to Mt. Lemmon Survey observation at 0911 UTC 5 Sept. 2019
  • last observed at 0003 UTC on 7 Sept. 2019 by Visnjan Obs.
Links  
2019 RM1   -     departed
Approximate diameter9 meters (H=27.791)
Closest Earth approach8.13 LD at 2205 UTC on 5 Sept. 2019 - Note: JPL reports an approach uncertainty of +/- 6 minutes
Inside ten LD of Earth2 to 9 Sept. 2019
Data based onJPL SSD orbit solution #1 downloaded from JPL on 6 Sept. 2019 UTC
based on 20 observations spanning one day
Optical observation  
  • reported from 6 observing codes during 23.870 hours: G96, H01, H21, I52, I93, L01
  • designation assigned to Mt. Lemmon Survey observation at 0735 UTC 5 Sept. 2019
  • last observed at 0727 UTC on 6 Sept. 2019 by Steward Obs. Mt. Lemmon Station
NotesNHATS target
Links  
2019 RF1   -     departed
Approximate diameter5 meters (H=28.954)
Closest Earth approach3.53 LD at 1142 UTC on 4 Sept. 2019
Inside ten LD of Earth28 Aug. until 11 Sept. 2019
Data based onJPL SSD orbit solution #1 downloaded from JPL on 6 Sept. 2019 UTC
based on 26 observations spanning one day
Optical observation  
  • reported from 6 observing codes during 23.707 hours: G96, H21, I52, I93, J95, L01
  • designation assigned to Mt. Lemmon Survey observation at 0729 UTC 5 Sept. 2019
  • last observed at 0712 UTC on 6 Sept. 2019 by ARO Westfield
Links  
2019 RE1   -     departed
Approximate diameter6 meters (H=28.887)
Closest Earth approach3.83 LD at 0703 UTC on 2 Sept. 2019 - Note: JPL reports an approach uncertainty of +/- 3 minutes
Inside ten LD of Earth27 Aug. until 7 Sept. 2019
Data based onJPL SSD orbit solution #1 downloaded from JPL on 6 Sept. 2019 UTC
based on 16 observations spanning one day
Optical observation  
  • reported from 3 observing codes during 21.814 hours: G96, H21, L01
  • designation assigned to Mt. Lemmon Survey observation at 0728 UTC 5 Sept. 2019
  • last observed at 0517 UTC on 6 Sept. 2019 by ARO Westfield
Links  
2019 RD1   -     departed
Approximate diameter14 meters (H=26.906)
Closest Earth approach6.11 LD at 0110 UTC on 6 Sept. 2019 - Note: JPL reports an approach uncertainty of +/- 3 minutes
Inside ten LD of Earth1 to 11 Sept. 2019
Data based onJPL SSD orbit solution #2 downloaded from JPL on 6 Sept. 2019 UTC
based on 44 observations spanning one day
Optical observation  
  • reported from 9 observing codes during 24.907 hours: 850, G34, G96, H01, H21, I52, I93, J95, L01
  • designation assigned to Mt. Lemmon Survey observation at 0759 UTC 5 Sept. 2019
  • last observed at 0854 UTC on 6 Sept. 2019 by Cordell-Lorenz Obs.
Links  
2019 RC1   -     departed intruder
Approximate diameter6 meters (H=28.817)
Closest Earth approach0.48 LD at 1047 UTC on 7 Sept. 2019
Inside Earth-Moon system0610-1524 UTC on 7 Sept. 2019
Inside Earth SOI6 to 7 Sept. 2019
Inside ten LD of Earth5 to 9 Sept. 2019
Closest Moon approach1.06 LD at 0918 UTC on 7 Sept. 2019
Data based onJPL SSD orbit solution #2 downloaded from JPL on 7 Sept. 2019 UTC
based on 31 observations spanning 2 days
Optical observation  
  • reported from 7 observing codes during 1.7711 days: 734, G96, H21, I52, J69, J95, L01
  • designation assigned to Mt. Lemmon Survey observation at 0701 UTC 5 Sept. 2019
  • last observed at 0132 UTC on 7 Sept. 2019 by Great Shefford Obs.
Links  
2019 RQ   -     departed intruder
Approximate diameter3 meters (H=30.56)
Closest Earth approach0.29 LD at 1644 UTC on 2 Sept. 2019
Inside Earth-Moon system0853 on 2 Sept. until 0034 UTC on 3 Sept. 2019
Inside Earth SOI1 to 3 Sept. 2019
Inside ten LD of Earth30 Aug. until 6 Sept. 2019
Closest Moon approach0.14 LD at 0933 UTC on 2 Sept. 2019
Inside one LD of Moon0117-1748 UTC on 2 Sept. 2019
Data based onJPL SSD orbit solution #2 downloaded from JPL on 9 Sept. 2019 UTC
based on 20 observations spanning 3 days
Optical observation  
  • reported from 6 observing codes during 3.1578 days: 291, G96, H21, I52, L01, T12
  • designation assigned to Mt. Lemmon Survey observation at 0947 UTC 3 Sept. 2019
  • last observed at 1334 UTC on 6 Sept. 2019 by UH/Tholen NEO Follow-Up 2.24m Telescope
Notesrisk
Links  
2019 RP   -     departed
Approximate diameter13 meters (H=27.133)
Closest Earth approach3.97 LD at 0417 UTC on 31 Aug. 2019
Inside ten LD of Earth26 Aug. until 4 Sept. 2019
Data based onJPL SSD orbit solution #1 downloaded from JPL on 5 Sept. 2019 UTC
based on 27 observations spanning 2 days
Optical observation  
  • reported from 6 observing codes during 1.9062 days: F51, G96, H21, I52, I93, L01
  • designation assigned to Mt. Lemmon Survey observation at 1114 UTC 3 Sept. 2019
  • last observed at 0859 UTC on 5 Sept. 2019 by Steward Obs. Mt. Lemmon Station
Links  
2019 RH   -     departed
Approximate diameter22 meters (H=25.949)
Closest Earth approach6.95 LD at 0840 UTC on 10 Sept. 2019
Inside ten LD of Earth8 to 12 Sept. 2019
Data based onJPL SSD orbit solution #4 downloaded from JPL on 12 Sept. 2019 UTC
based on 24 observations spanning 4 days
Optical observation  
  • reported from 5 observing codes during 4.6588 days: 204, G96, H01, I52, L01
  • designation assigned to Mt. Lemmon Survey observation at 0720 UTC 4 Sept. 2019
  • last observed at 2308 UTC on 8 Sept. 2019 by Schiaparelli Obs.
Links  
2019 RA   -     departed
Approximate diameter28 meters (H=25.438)
Closest Earth approach4.52 LD at 0655 UTC on 7 Sept. 2019
Inside ten LD of Earth31 Aug. until 14 Sept. 2019
Data based onJPL SSD orbit solution #11 downloaded from JPL on 13 Sept. 2019 UTC
based on 273 observations spanning 7 days
Optical observation  
  • reported from 32 observing codes during 6.6157 days: 160, 203, 204, 246, 585, 595, 711, 734, 850, 958, A17, A44, A48, C47, G40, H01, H21, H36, I41, I52, I93, J69, J95, K61, K88, K96, L01, T05, V01, W34, Z66, Z80
  • designation assigned to ATLAS Haleakala observation at 0938 UTC 1 Sept. 2019
  • last observed at 0024 UTC on 8 Sept. 2019 by Northolt Branch Obs.
NotesNHATS target
Links  
2019 QL7   -     departed
Approximate diameter16 meters (H=26.596)
Closest Earth approach4.85 LD at 1232 UTC on 23 Aug. 2019 - Note: JPL reports an approach uncertainty of +/- 8 minutes
Inside ten LD of Earth20 to 26 Aug. 2019
Data based onJPL SSD orbit solution #2 downloaded from JPL on 3 Sept. 2019 UTC
based on 48 observations spanning 3 days
Optical observation  
  • reported from 3 observing codes during 2.9065 days: 807, F51, H21
  • first observed at 0611 UTC on 31 Aug. 2019 by Pan-STARRS 1
  • designation assigned to Pan-STARRS 1 observation at 1056 UTC 31 Aug. 2019
  • last observed at 0356 UTC on 3 Sept. 2019 by ARO Westfield
Links  
2019 QE7   -     departed
Approximate diameter16 meters (H=26.673)
Closest Earth approach2.66 LD at 1337 UTC on 22 Aug. 2019 - Note: JPL reports an approach uncertainty of +/- 13 minutes
Inside ten LD of Earth18 to 26 Aug. 2019
Data based onJPL SSD orbit solution #4 downloaded from JPL on 5 Sept. 2019 UTC
based on 23 observations spanning 5 days
Optical observation  
  • reported from 7 observing codes during 4.8050 days: 291, 568, 691, 807, F51, H21, T12
  • designation assigned to Pan-STARRS 1 observation at 1341 UTC 31 Aug. 2019
  • last observed at 0900 UTC on 5 Sept. 2019 by the Spacewatch 1.8m telescope
Notesrisk
Links  
2019 QY4   -   outbound
Approximate diameter10 meters (H=27.722)
Closest Earth approach2.50 LD at 0109 UTC on 10 Sept. 2019
Inside ten LD of Earth4 to 15 Sept. 2019
Data based onJPL SSD orbit solution #5 downloaded from JPL on 12 Sept. 2019 UTC
based on 29 observations spanning 12 days
Optical observation  
  • reported from 6 observing codes during 12.5100 days: 204, 691, F51, G96, I52, J95
  • designation assigned to Pan-STARRS 1 observation at 1002 UTC 28 Aug. 2019
  • last observed at 2216 UTC on 9 Sept. 2019 by Great Shefford Obs.
NotesNHATS target
Links  
2019 QZ3   -     departed
Approximate diameter38 meters (H=24.756)
Closest Earth approach9.69 LD at 1015 UTC on 9 Sept. 2019
Inside ten LD of Earth7 to 10 Sept. 2019
Data based onJPL SSD orbit solution #10 downloaded from JPL on 12 Sept. 2019 UTC
based on 89 observations spanning 22 days
Optical observation  
  • reported from 19 observing codes during 22.1097 days: 160, 204, 246, A44, C47, F51, F52, G96, H01, H21, I52, I93, J04, J69, J95, K87, L01, V37, Z80
  • first observed at 1146 UTC on 20 Aug. 2019 by Pan-STARRS 2
  • designation assigned to Mt. Lemmon Survey observation at 0516 UTC 26 Aug. 2019
  • last observed at 1424 UTC on 11 Sept. 2019 by Pan-STARRS 1
NotesNHATS target
Links  
2019 QU3   -     departed
Approximate diameter6 meters (H=28.706)
Closest Earth approach1.74 LD at 1338 UTC on 24 Aug. 2019
Inside Earth SOI23 to 25 Aug. 2019
Inside ten LD of Earth17 to 31 Aug. 2019
Closest Moon approach2.23 LD at 0000 UTC on 25 Aug. 2019
Data based onJPL SSD orbit solution #4 downloaded from JPL on 9 Sept. 2019 UTC
based on 26 observations spanning 12 days
Optical observation  
  • reported from 6 observing codes during 12.2192 days: G96, H01, H21, I52, T12, T14
  • designation assigned to Mt. Lemmon Survey observation at 0816 UTC 27 Aug. 2019
  • last observed at 1331 UTC on 8 Sept. 2019 by UH/Tholen NEO Follow-Up CFH Telescope
Notesrisk
Links  
2019 QE   -     departed
Approximate diameter14 meters (H=26.944)
Closest Earth approach3.49 LD at 1012 UTC on 20 Aug. 2019
Inside ten LD of Earth15 to 25 Aug. 2019
Data based onJPL SSD orbit solution #8 downloaded from JPL on 6 Sept. 2019 UTC
based on 89 observations spanning 17 days
Optical observation  
  • reported from 19 observing codes during 17.1737 days: 291, 568, 691, 703, 807, 958, A44, E23, F51, F52, G34, H21, I52, I93, J04, L01, L29, T12, Z80
  • first observed at 0702 UTC on 20 Aug. 2019 by Pan-STARRS 1
  • designation assigned to Catalina Sky Survey observation at 0452 UTC 21 Aug. 2019
  • last observed at 1112 UTC on 6 Sept. 2019 by the Spacewatch 1.8m telescope
Notesrisk
Links  
2019 PO1   -     departed
Approximate diameter8 meters (H=28.063)
Closest Earth approach7.50 LD at 0444 UTC on 14 July 2019 - Note: JPL reports an approach uncertainty of +/- 3 minutes
Inside ten LD of Earth25 June until 3 Aug. 2019
Data based onJPL SSD orbit solution #13 downloaded from JPL on 5 Sept. 2019 UTC
based on 48 observations spanning 26 days
Optical observation  
  • reported from 7 observing codes during 25.8407 days: 291, 691, F51, H21, L01, T12, T14
  • designation assigned to Pan-STARRS 1 observation at 1245 UTC 9 Aug. 2019
  • last observed at 0855 UTC on 4 Sept. 2019 by UH/Tholen NEO Follow-Up 2.24m Telescope
Notesrisk, NHATS target
Links  
2017 SL16   -   approaching
Approximate diameter23 meters (H=25.8)
Closest Earth approach7.89 LD at 0211 UTC on 21 Sept. 2019
Inside ten LD of Earth16 to 25 Sept. 2019
Data based onJPL SSD orbit solution #7 downloaded from JPL on 8 Sept. 2019 UTC (dated 10 Oct. 2018 local)
based on 46 observations spanning 2017-2018
Optical observation  
    none recent
NotesNHATS target
previous observation Sept.-Oct. 2017 and passage Sept. 2018 at 8.49 LD
Links  
2017 KP27   -   approaching
Approximate diameter23 meters (H=25.8)
Closest Earth approach4.22 LD at 1935 UTC on 26 Sept. 2019
Inside ten LD of Earth18 Sept. until 5 Oct. 2019
Data based onJPL SSD orbit solution #4 downloaded from JPL on 15 Sept. 2019 UTC
based on 33 observations spanning 2017-2019
Optical observation  
  • reported from 6 observing codes during 7.5137 days: 568, 595, 711, F51, H21, L01
  • first observed at 1310 UTC on 6 Sept. 2019 by Pan-STARRS 1
  • last observed at 0130 UTC on 14 Sept. 2019 by Farra d'Isonzo Obs.
NotesNHATS target
previous passage May 2017 at 8.11 LD +/- 2 mins. uncertainty
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.