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Legend - object IDs plus links to more info

Data compiled at 1822 UTC on 17 Jan. 2018 for 25 known objects during a period of seven days from 14 to 20 Jan. 2018. Orange is for objects with a new JPL orbit solution (usually from new observation).

Chart
ID

Full ID
Period
Closest
Passage
Uncertainty

Status
AA42018 AA49.86 LD  departed
AG42018 AG41.40 LDpassing
AH2018 AH36.40 LD  departed intruder
AJ2018 AJ5.64 LD+/- 4 minutesinbound
AJ32018 AJ39.64 LD  departed
AQ10208023 1999 AQ1055.3 LD  distant
AS22018 AS21.16 LDoutbound
AS2207398 2006 AS2268.4 LD  distant
AT22018 AT25.10 LDoutbound
AT722013 AT7238.6 LD  distant
AU22018 AU22.73 LDoutbound
AV22018 AV26.7 LD+/- 34 minutesoutbound
AW112018 AW118.49 LD  departed
BT18450894 2008 BT18332.7 LD  distant
DK2002015 DK200103.3 LD+/- 23.4500 hoursapproaching
DR1092017 DR10962.8 LD+/- 30 minutesapproaching
UB952008 UB9591.0 LD  distant
VA152017 VA1570.39 LD  departed
VR122017 VR1261.24 LD+/- one minuteapproaching
VT142017 VT1464.47 LD  departed
XN602017 XN6063.63 LD  departed
XY2006 XY32.61 LD  departed
YH12017 YH191.22 LD  departed
YR32017 YR330.58 LD  departed
YW32017 YW318.06 LD  departed
DateTfc.Time
14 Jan. '18Rept. Line
15 Jan. '18Rept. Line
16 Jan. '18Rept. Line
17 Jan. '18Rept. Line
18 Jan. '18Rept. Line
19 Jan. '18 Line
20 Jan. '18 Line

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

2018 AW11   -     departed
Approximate diameter24 meters (H=25.766)
Closest Earth approach7.09 LD at 1958 UT on 10 Jan. 2018
Inside ten LD of Earth6 to 15 Jan. 2018
Data based onJPL SSD orbit solution #2 downloaded from JPL on 17 Jan. 2018 UTC
based on 42 observations spanning 2 days
Optical observation  
  • reported from 8 observing codes during 2.5964 days: 033, 691, 711, G96, H01, I52, K88, L04
  • designation assigned to Mt. Lemmon Survey observation at 0438 UT 14 Jan. 2018
  • last observed at 1857 UT on 16 Jan. 2018 by Schwarzschild Obs.
Links  
2018 AG4   -   passing
Approximate diameter22 meters (H=25.972)
Closest Earth approach1.40 LD at 1040 UT on 17 Jan. 2018
Inside Earth SOI16 to 18 Jan. 2018
Inside ten LD of Earth12 to 22 Jan. 2018
Closest Moon approach2.02 LD at 1954 UT on 17 Jan. 2018
Data based onJPL SSD orbit solution #3 downloaded from JPL on 17 Jan. 2018 UTC
based on 80 observations spanning 3 days
Optical observation  
  • reported from 14 observing codes during 3.0924 days: 291, 703, 711, 718, A17, H01, H06, I52, J04, K87, K88, L04, W34, Z80
  • designation assigned to Catalina Sky Survey observation at 0559 UT 14 Jan. 2018
  • last observed at 0812 UT on 17 Jan. 2018 by the Spacewatch 1.8m telescope
NotesNHATS target
Links  
2018 AA4   -     departed
Approximate diameter23 meters (H=25.836)
Closest Earth approach3.53 LD at 0329 UT on 10 Jan. 2018
Inside ten LD of Earth6 to 14 Jan. 2018
Data based onJPL SSD orbit solution #2 downloaded from JPL on 17 Jan. 2018 UTC
based on 56 observations spanning 4 days
Optical observation  
  • reported from 12 observing codes during 4.1201 days: 160, 204, 691, 703, 711, A17, G96, H01, I52, J04, K63, K88
  • designation assigned to Catalina Sky Survey observation at 0707 UT 13 Jan. 2018
  • last observed at 1000 UT on 17 Jan. 2018 by Steward Obs. Mt. Lemmon Station
Links  
2018 AJ3   -     departed
Approximate diameter10 meters (H=27.715)
Closest Earth approach7.58 LD at 1214 UT on 5 Jan. 2018
Inside ten LD of Earth26 Dec. until 14 Jan. 2018
Data based onJPL SSD orbit solution #3 downloaded from JPL on 17 Jan. 2018 UTC
based on 49 observations spanning 5 days
Optical observation  
  • reported from 7 observing codes during 5.0892 days: 204, 703, 711, F51, G96, H01, I52
  • designation assigned to Mt. Lemmon Survey observation at 0729 UT 12 Jan. 2018
  • last observed at 0937 UT on 17 Jan. 2018 by Steward Obs. Mt. Lemmon Station
NotesNHATS target
Links  
2018 AV2   -   outbound
Approximate diameter6 meters (H=28.788)
Closest Earth approach6.66 LD at 1121 UT on 15 Jan. 2018 - Note: JPL reports an approach uncertainty of +/- 34 minutes
Inside ten LD of Earth10 Nov. until 2 March 2018
Data based onJPL SSD orbit solution #6 downloaded from JPL on 17 Jan. 2018 UTC
based on 58 observations spanning 2017-2018
Optical observation  
  • reported from 9 observing codes during 34.9075 days: 291, 691, 711, 807, F51, G96, H01, I52, J04
  • first observed at 1135 UT on 12 Dec. 2017 by Pan-STARRS 1
  • designation assigned to Mt. Lemmon Survey observation at 0749 UT 13 Jan. 2018
  • last observed at 0922 UT on 16 Jan. 2018 by Pan-STARRS 1
NotesNHATS target
Links  
2018 AU2   -   outbound
Approximate diameter11 meters (H=27.396)
Closest Earth approach2.73 LD at 1216 UT on 14 Jan. 2018
Inside ten LD of Earth9 to 19 Jan. 2018
Data based onJPL SSD orbit solution #1 downloaded from JPL on 14 Jan. 2018 UTC
based on 33 observations spanning one day
Optical observation  
  • reported from 7 observing codes during 23.021 hours: 160, 587, 595, G96, H01, I52, K51
  • designation assigned to Mt. Lemmon Survey observation at 0550 UT 13 Jan. 2018
  • last observed at 0451 UT on 14 Jan. 2018 by Steward Obs. Mt. Lemmon Station
Links  
2018 AT2   -   outbound
Approximate diameter10 meters (H=27.739)
Closest Earth approach1.83 LD at 0109 UT on 11 Jan. 2018
Inside Earth SOI10 to 12 Jan. 2018
Inside ten LD of Earth4 to 17 Jan. 2018
Closest Moon approach2.71 LD at 0648 UT on 11 Jan. 2018
Data based onJPL SSD orbit solution #4 downloaded from JPL on 17 Jan. 2018 UTC
based on 27 observations spanning 5 days
Optical observation  
  • reported from 5 observing codes during 4.7430 days: 691, 703, I52, J04, J22
  • designation assigned to Catalina Sky Survey observation at 0800 UT 12 Jan. 2018
  • last observed at 0150 UT on 17 Jan. 2018 by ESA Optical Ground Station
Notesrisk
Links  
2018 AS2   -   outbound
Approximate diameter6 meters (H=28.597)
Closest Earth approach1.16 LD at 1117 UT on 14 Jan. 2018
Inside Earth SOI13 to 15 Jan. 2018
Inside ten LD of Earth8 to 20 Jan. 2018
Closest Moon approach1.10 LD at 2131 UT on 14 Jan. 2018
Data based onJPL SSD orbit solution #1 downloaded from JPL on 14 Jan. 2018 UTC
based on 16 observations spanning one day
Optical observation  
  • reported from 4 observing codes during 1.2283 days: 204, 711, G96, I52
  • designation assigned to Mt. Lemmon Survey observation at 0756 UT 12 Jan. 2018
  • last observed at 1325 UT on 13 Jan. 2018 by the Mt. Lemmon Survey
NotesNHATS target
Links  
2018 AJ   -   inbound
Approximate diameter37 meters (H=24.823)
Closest Earth approach4.65 LD at 1228 UT on 23 Jan. 2018 - Note: JPL reports an approach uncertainty of +/- 4 minutes
Inside ten LD of Earth16 to 30 Jan. 2018
Data based onJPL SSD orbit solution #2 downloaded from JPL on 14 Jan. 2018 UTC
based on 33 observations spanning 9 days
Optical observation  
  • reported from 5 observing codes during 9.0662 days: 703, G96, H01, I52, J95
  • designation assigned to Mt. Lemmon Survey observation at 0408 UT 5 Jan. 2018
  • last observed at 0543 UT on 14 Jan. 2018 by the Catalina Sky Survey
NotesNHATS target
Links  
2018 AH   -     departed intruder
Approximate diameter107 meters (H=22.493)
Closest Earth approach0.77 LD at 0424 UT on 2 Jan. 2018
Inside Earth-Moon system2327 on 1 Jan. until 0921 UT on 2 Jan. 2018
Inside Earth SOI1 to 2 Jan. 2018
Inside ten LD of Earth29 Dec. until 5 Jan. 2018
Closest Moon approach1.42 LD at 0956 UT on 2 Jan. 2018
Data based onJPL SSD orbit solution #5 downloaded from JPL on 15 Jan. 2018 UTC
based on 74 observations spanning 11 days
Optical observation  
  • reported from 17 observing codes during 10.8034 days: 703, 718, 926, B49, C23, C27, F51, G40, G48, H01, H06, I52, I89, T05, T08, W34, Z80
  • first observed at 1411 UT on 3 Jan. 2018 by Pan-STARRS 1
  • designation assigned to ATLAS Mauna Loa observation at 1322 UT 4 Jan. 2018
  • last observed at 0928 UT on 14 Jan. 2018 by the Catalina Sky Survey
Links  
2017 YW3   -     departed
Approximate diameter17 meters (H=26.507)
Closest Earth approach4.84 LD at 1750 UT on 19 Dec. 2017
Inside ten LD of Earth5 Dec. until 1 Jan. 2018
Data based onJPL SSD orbit solution #6 downloaded from JPL on 12 Jan. 2018 UTC
based on 46 observations spanning 2017-2018
Optical observation  
  • reported from 10 observing codes during 18.7765 days: 113, 291, 691, 703, 711, 926, G96, H36, I52, T05
  • designation assigned to ATLAS Haleakala observation at 1030 UT 24 Dec. 2017
  • last observed at 0509 UT on 12 Jan. 2018 by Steward Obs. Mt. Lemmon Station
NotesNHATS target
Links  
2017 YR3   -     departed
Approximate diameter29 meters (H=25.315)
Closest Earth approach8.47 LD at 1339 UT on 25 Dec. 2017
Inside ten LD of Earth21 to 29 Dec. 2017
Data based onJPL SSD orbit solution #4 downloaded from JPL on 14 Jan. 2018 UTC
based on 26 observations spanning 2017-2018
Optical observation  
  • reported from 5 observing codes during 22.2378 days: 807, 926, G96, I52, V06
  • designation assigned to Mt. Lemmon Survey observation at 0320 UT 23 Dec. 2017
  • last observed at 0902 UT on 14 Jan. 2018 by Steward Obs. Mt. Lemmon Station
NotesNHATS target
Links  
2017 YH1   -     departed
Approximate diameter203 meters (H=21.113)
Closest Earth approach2.38 LD at 0026 UT on 18 Dec. 2017
Inside Earth SOI17 to 18 Dec. 2017
Inside ten LD of Earth15 to 20 Dec. 2017
Data based onJPL SSD orbit solution #11 downloaded from JPL on 13 Jan. 2018 UTC
based on 223 observations spanning 2017-2018
Optical observation  
  • reported from 33 observing codes during 23.9705 days: 104, 160, 203, 204, 595, 703, 711, 718, A77, B49, C47, C77, F51, G40, G48, G96, H06, H21, H36, I52, J69, K32, K38, K63, K74, K88, L04, P93, T05, T08, U69, V06, Z80
  • designation assigned to Catalina Sky Survey observation at 0651 UT 20 Dec. 2017
  • last observed at 0609 UT on 13 Jan. 2018 by Steward Obs. Mt. Lemmon Station
Links  
2017 XN60   -     departed
Approximate diameter25 meters (H=25.637)
Closest Earth approach3.11 LD at 2308 UT on 5 Dec. 2017
Inside ten LD of Earth29 Nov. until 11 Dec. 2017
Data based onJPL SSD orbit solution #3 downloaded from JPL on 15 Jan. 2018 UTC
based on 28 observations spanning 2017-2018
Optical observation  
  • reported from 5 observing codes during 31.9685 days: 033, 703, 926, H21, I52
  • designation assigned to Catalina Sky Survey observation at 0858 UT 13 Dec. 2017
  • last observed at 0813 UT on 14 Jan. 2018 by ARO Westfield
Links  
2017 VA15   -     departed
Approximate diameter33 meters (H=25.073)
Closest Earth approach8.01 LD at 1558 UT on 22 Nov. 2017
Inside ten LD of Earth18 to 26 Nov. 2017
Data based onJPL SSD orbit solution #8 downloaded from JPL on 15 Jan. 2018 UTC
based on 100 observations spanning 2017-2018
Optical observation  
  • reported from 21 observing codes during 62.0560 days: 104, 160, 204, 246, 587, 595, 703, 850, 926, F51, H01, H21, H45, I52, I93, K51, K63, T08, V03, V06, Z80
  • first observed at 0800 UT on 13 Nov. 2017 by Pan-STARRS 1
  • designation assigned to Catalina Sky Survey observation at 0549 UT 15 Nov. 2017
  • last observed at 0921 UT on 14 Jan. 2018 by ARO Westfield
Links  
2017 VT14   -     departed
Approximate diameter85 meters (H=23.003)
Closest Earth approach3.83 LD at 0156 UT on 17 Dec. 2017
Inside ten LD of Earth13 to 21 Dec. 2017
Data based onJPL SSD orbit solution #22 downloaded from JPL on 11 Jan. 2018 UTC
based on 74 observations spanning 2017-2018 including radar
Optical observation  
  • reported from 11 observing codes during 57.8061 days: 291, 587, 691, 807, 926, C51, F51, H45, J04, T08, W88
  • designation assigned to WISE observation at 1821 UT 13 Nov. 2017
  • last observed at 1342 UT on 10 Jan. 2018 by Pan-STARRS 1
Radar observation  
  • observed 4 times from one location during 0.0347 days
  • first observed at 0040 UT on 14 Dec. 2017 by Goldstone DSS-14 70m antenna
  • last observed at 0130 UT on 14 Dec. 2017 by Goldstone DSS-14 70m antenna
Notesradar target
Links  
2017 VR12   -   approaching
Approximate diameter271 meters (H=20.487)
Closest Earth approach3.76 LD at 0752 UT on 7 March 2018
Inside ten LD of Earth28 Feb. until 13 March 2018
Data based onJPL SSD orbit solution #22 downloaded from JPL on 17 Jan. 2018 UTC
based on 116 observations spanning 2017-2018
Optical observation  
  • reported from 16 observing codes during 66.9482 days: 033, 204, 291, 703, 711, B67, F51, G96, H01, H21, H45, I52, J04, T05, T08, V06
  • designation assigned to Pan-STARRS 1 observation at 1357 UT 10 Nov. 2017
  • last observed at 1243 UT on 16 Jan. 2018 by ATLAS Mauna Loa
Notesradar target, NHATS target
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 DK200   -   approaching
Approximate diameter26 meters (H=25.6)
Closest Earth approach6.91 LD at 0509 UT on 10 March 2018 - Note: JPL reports an approach uncertainty of +/- 23.4500 hours
Inside ten LD of Earth6 to 14 March 2018
Data based onJPL SSD orbit solution #11 downloaded from JPL on 14 Jan. 2018 UTC (dated 6 April 2017 local)
based on 27 observations spanning 16 days
Optical observation  
    none recent
NotesNHATS target
previous passage March 2015 at 6.89 LD
Links  
2013 AT72   -     distant
Approximate diameter49 meters (H=24.2)
Distance from Earth36.4 LD during the observation period
Data based onJPL SSD orbit solution #13 downloaded from JPL on 15 Jan. 2018 UTC
based on 70 observations spanning 2013-2018
Optical observation  
  • reported from one observing code during 0.178 hours: 926
  • first observed at 0332 UT on 12 Jan. 2018 by Tenagra II Obs.
  • last observed at 0343 UT on 12 Jan. 2018 by Tenagra II Obs.
Notesprevious passage Jan. 2013 at 9.85 LD
Links  
2008 UB95   -     distant
Approximate diameter39 meters (H=24.7)
Distance from Earth100.0 - 100.1 LD min-max during the observation period
Data based onJPL SSD orbit solution #15 downloaded from JPL on 15 Jan. 2018 UTC
based on 61 observations spanning 2008-2018
Optical observation  
  • reported from one observing code during 0.691 hours: H21
  • first observed at 0631 UT on 14 Jan. 2018 by ARO Westfield
  • last observed at 0712 UT on 14 Jan. 2018 by ARO Westfield
NotesNHATS target
previous passage Oct. 2008 at 4.40 LD and observation Oct. 2009
Links  
450894 2008 BT18   -     distant
Approximate diameter741 meters (H=18.3)
Distance from Earth371.6 - 502.2 LD min-max during the observation period
Data based onJPL SSD orbit solution #69 downloaded from JPL on 15 Jan. 2018 UTC
based on 267 observations spanning 1955-2018 including radar
Optical observation  
  • reported from one observing code during 19.9695 days: G96
  • first observed at 1147 UT on 25 Dec. 2017 by the Mt. Lemmon Survey
  • last observed at 1103 UT on 14 Jan. 2018 by the Mt. Lemmon Survey
Notesprevious passage July 2008 at 5.87 LD and observation Oct. 2015
Links  
2006 XY   -     departed
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 #28 downloaded from JPL on 10 Jan. 2018 UTC
based on 186 observations spanning 2006-2018
Optical observation  
  • reported from 13 observing codes during 44.4847 days: 160, 204, 691, 703, 926, F51, G96, H21, H45, I52, T05, T08, V06
  • first observed at 0231 UT on 26 Nov. 2017 by the Mt. Lemmon Survey
  • last observed at 1409 UT on 9 Jan. 2018 by Pan-STARRS 1
NotesNHATS target
previous passage Dec. 2006 at 4.8 LD
Links  
207398 2006 AS2   -     distant
Approximate diameter282 meters (H=20.4)
Distance from Earth274.4 LD during the observation period
Data based onJPL SSD orbit solution #72 downloaded from JPL on 11 Jan. 2018 UTC
based on 376 observations spanning 2003-2018 including radar
Optical observation  
  • reported from one observing code during 0.907 hours: F51
  • first observed at 0911 UT on 10 Jan. 2018 by Pan-STARRS 1
  • last observed at 1005 UT on 10 Jan. 2018 by Pan-STARRS 1
Notesprevious passage Feb. 2009 at 9.16 LD, observation Jan. 2012, observation Aug. 2012, observation Dec.-Feb. 2015, and observation July 2015
Links  
208023 1999 AQ10   -     distant
Approximate diameter282 meters (H=20.4)
Distance from Earth60.6 - 173.1 LD min-max during the observation period
Data based onJPL SSD orbit solution #107 downloaded from JPL on 13 Jan. 2018 UTC
based on 380 observations spanning 1999-2018 including radar
Optical observation  
  • reported from 5 observing codes during 75.1553 days: 703, F51, G96, T05, T08
  • first observed at 1044 UT on 29 Oct. 2017 by the Mt. Lemmon Survey
  • last observed at 1427 UT on 12 Jan. 2018 by ATLAS Mauna Loa
NotesNHATS target
previous observation Oct.-Feb. 2008, passage Feb. 2009 at 4.39 LD, and observation Oct.-Jan. 2017
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.