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Legend - object IDs plus links to more info

Data compiled at 1730 UTC on 23 May 2017 for twelve known objects during a period of seven days from 20 to 26 May 2017. Orange is for objects with a new JPL orbit solution (usually from new observation).

Chart
ID

Full ID
Period
Closest
Passage
Uncertainty

Status
CS2017 CS9.66 LDapproaching
HU492017 HU496.43 LD+/- one minuteoutbound
JA22017 JA216.38 LD  departed
JB22017 JB210.71 LD+/- one minute  departed intruder
JG32017 JG334.61 LD  departed
JM22017 JM216.77 LD  departed
JO252014 JO25238.71 LD  departed
JP22017 JP254.80 LD  departed
JX12017 JX116.29 LD  departed
JY12017 JY121.23 LD  departed
KG32017 KG322.69 LD  departed
KZ22017 KZ234.49 LD  departed
DateTfc.Time
20 May '17Rept. Line
21 May '17Rept. Line
22 May '17Rept. Line
23 May '17Rept. Line
24 May '17Rept. Line
25 May '17 Line
26 May '17 Line

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

2017 KG3   -     departed
Approximate diameter40 meters (H=24.66)
Closest Earth approach5.57 LD at 0012 UT on 13 May 2017
Inside ten LD of Earth10 to 15 May 2017
Data based onJPL SSD orbit solution #2 downloaded from JPL on 22 May 2017 UTC
based on 65 observations spanning 5 days
Optical observation  
  • reported from 14 observing codes during 4.9014 days: 151, 203, 595, 703, 734, 926, C47, G96, H21, I52, I93, J22, K88, L04
  • designation assigned to Catalina Sky Survey observation at 0859 UT 17 May 2017
  • last observed at 0637 UT on 22 May 2017 by Steward Obs. Mt. Lemmon Station
Links  
2017 KZ2   -     departed
Approximate diameter33 meters (H=25.024)
Closest Earth approach7.25 LD at 0630 UT on 11 May 2017
Inside ten LD of Earth9 to 13 May 2017
Data based onJPL SSD orbit solution #1 downloaded from JPL on 21 May 2017 UTC
based on 25 observations spanning 4 days
Optical observation  
  • reported from 4 observing codes during 4.0502 days: 587, 705, 926, G96
  • designation assigned to Mt. Lemmon Survey observation at 0409 UT 16 May 2017
  • last observed at 0522 UT on 20 May 2017 by the Mt. Lemmon Survey
Links  
2017 JG3   -     departed
Approximate diameter25 meters (H=25.639)
Closest Earth approach7.64 LD at 0557 UT on 10 May 2017
Inside ten LD of Earth8 to 12 May 2017
Data based onJPL SSD orbit solution #2 downloaded from JPL on 21 May 2017 UTC
based on 23 observations spanning 7 days
Optical observation  
  • reported from 3 observing codes during 7.0175 days: 291, 926, G96
  • designation assigned to Mt. Lemmon Survey observation at 0808 UT 14 May 2017
  • last observed at 0833 UT on 21 May 2017 by the Spacewatch 1.8m telescope
Links  
2017 JP2   -     departed
Approximate diameter66 meters (H=23.544)
Closest Earth approach9.10 LD at 0326 UT on 3 May 2017
Inside ten LD of Earth1 to 4 May 2017
Data based onJPL SSD orbit solution #5 downloaded from JPL on 22 May 2017 UTC
based on 80 observations spanning 13 days
Optical observation  
  • reported from 15 observing codes during 13.1173 days: 160, 204, 587, 703, 705, 926, C77, F51, G96, H21, I52, J43, J95, K41, W25
  • designation assigned to Catalina Sky Survey observation at 0545 UT 7 May 2017
  • last observed at 0834 UT on 20 May 2017 by Steward Obs. Mt. Lemmon Station
Links  
2017 JM2   -     departed
Approximate diameter46 meters (H=24.333)
Closest Earth approach5.09 LD at 0348 UT on 15 May 2017
Inside ten LD of Earth12 to 17 May 2017
Data based onJPL SSD orbit solution #6 downloaded from JPL on 16 May 2017 UTC
based on 110 observations spanning 19 days
Optical observation  
  • reported from 14 observing codes during 18.6676 days: 160, 204, 587, 705, 926, B49, F51, G96, H01, H21, H45, I52, J95, W25
  • first observed at 1418 UT on 26 April 2017 by Pan-STARRS 1
  • designation assigned to Mt. Lemmon Survey observation at 0902 UT 5 May 2017
  • last observed at 0619 UT on 15 May 2017 by Tenagra II Obs.
Links  
2017 JB2   -     departed intruder
Approximate diameter5 meters (H=29.025)
Closest Earth approach0.14 LD at 0317 UT on 4 May 2017
Inside Earth-Moon system2049 on 2 May until 0945 UT on 5 May 2017
Inside Earth SOI30 April until 7 May 2017
Inside ten LD of Earth19 April until 18 May 2017
Closest Moon approach0.73 LD at 2126 UT on 2 May 2017
Inside one LD of Moon2158 on 1 May until 2110 UT on 3 May 2017
Data based onJPL SSD orbit solution #1 downloaded from JPL on 10 May 2017 UTC
based on 27 observations spanning 4 days
Optical observation  
  • reported from 5 observing codes during 3.6689 days: 703, G96, H21, I52, J95
  • designation assigned to Catalina Sky Survey observation at 1039 UT 6 May 2017
  • last observed at 0243 UT on 10 May 2017 by Great Shefford Obs.
Notesrisk
Links  
2017 JA2   -     departed
Approximate diameter38 meters (H=24.771)
Closest Earth approach2.57 LD at 1230 UT on 12 May 2017
Inside ten LD of Earth8 to 16 May 2017
Data based onJPL SSD orbit solution #7 downloaded from JPL on 13 May 2017 UTC
based on 186 observations spanning 8 days
Optical observation  
  • reported from 22 observing codes during 8.0167 days: 160, 203, 204, 587, 703, 718, 734, 926, 970, C47, C97, G96, H01, H06, H36, I52, J69, J95, K38, Q62, W25, Z80
  • designation assigned to Catalina Sky Survey observation at 0538 UT 4 May 2017
  • last observed at 0602 UT on 12 May 2017 by Tenagra II Obs.
Links  
2017 JY1   -     departed
Approximate diameter30 meters (H=25.295)
Closest Earth approach8.88 LD at 1122 UT on 9 May 2017
Inside ten LD of Earth6 to 11 May 2017
Data based onJPL SSD orbit solution #3 downloaded from JPL on 22 May 2017 UTC
based on 36 observations spanning 17 days
Optical observation  
  • reported from 7 observing codes during 17.4768 days: 204, 474, 587, 734, G96, H01, I52
  • designation assigned to Mt. Lemmon Survey observation at 0406 UT 4 May 2017
  • last observed at 1532 UT on 21 May 2017 by Mt. John Obs.
Links  
2017 JX1   -     departed
Approximate diameter21 meters (H=26.06)
Closest Earth approach3.71 LD at 0249 UT on 11 May 2017
Inside ten LD of Earth5 to 16 May 2017
Data based onJPL SSD orbit solution #5 downloaded from JPL on 13 May 2017 UTC
based on 49 observations spanning 7 days
Optical observation  
  • reported from 10 observing codes during 6.8737 days: 204, 734, 926, G96, H01, H36, I52, J69, J95, W25
  • designation assigned to Mt. Lemmon Survey observation at 0315 UT 4 May 2017
  • last observed at 0013 UT on 11 May 2017 by Great Shefford Obs.
Links  
2017 HU49   -   outbound
Approximate diameter18 meters (H=26.414)
Closest Earth approach5.56 LD at 2139 UT on 11 May 2017
Inside ten LD of Earth22 April until 2 June 2017
Data based onJPL SSD orbit solution #9 downloaded from JPL on 22 May 2017 UTC
based on 135 observations spanning 21 days
Optical observation  
  • reported from 26 observing codes during 20.9729 days: 033, 104, 107, 118, 204, 474, 595, 705, 807, 926, C43, C77, E23, G40, G96, H36, H45, I52, I93, J22, K41, K63, K65, K88, W25, Z84
  • designation assigned to Mt. Lemmon Survey observation at 1038 UT 30 April 2017
  • last observed at 0959 UT on 21 May 2017 by Mt. John Obs.
Links  
2017 CS   -   approaching
Approximate diameter446 meters (H=19.4)
Closest Earth approach7.93 LD at 1543 UT on 29 May 2017
Inside ten LD of Earth26 May until 1 June 2017
Data based onJPL SSD orbit solution #59 downloaded from JPL on 23 May 2017 UTC
based on 338 observations spanning 122 days
Optical observation  
  • reported from 29 observing codes during 121.6366 days: 107, 151, 160, 204, 291, 691, 695, 703, 807, B66, B67, C77, F51, G45, G48, G96, H21, H45, K14, K38, K65, K91, Q62, T05, V83, W25, W34, W85, W88
  • first observed at 1339 UT on 20 Jan. 2017 by Pan-STARRS 1
  • designation assigned to Pan-STARRS 1 observation at 1205 UT 2 Feb. 2017
  • last observed at 0456 UT on 22 May 2017 by the Catalina Sky Survey
Notesradar target
Links  
2014 JO25   -     departed
Approximate diameter812 meters (H=18.1)
Closest Earth approach4.57 LD at 1223 UT on 19 April 2017
Inside ten LD of Earth18 to 20 April 2017
Data based onJPL SSD orbit solution #56 downloaded from JPL on 19 May 2017 UTC
based on 1168 observations spanning 2011-2017 including radar
Optical observation  
  • reported from 63 observing codes during 28.8104 days: 006, 089, 104, 151, 160, 204, 213, 322, 510, 557, 595, 619, 691, 703, 850, 926, 970, A77, A81, B49, B74, B92, C23, C47, C77, C97, G27, G34, G48, G96, H06, H21, H32, H45, I39, I52, J22, J38, J69, J95, K17, K40, K42, K63, K74, K85, K87, L04, Q62, T05, T08, T12, T14, V37, V78, V83, W25, W34, W63, W87, Y00, Z73, Z80
  • first observed at 1143 UT on 17 April 2017 by Tenagra II Obs.
  • last observed at 0710 UT on 16 May 2017 by the Spacewatch 0.9m telescope
Notesradar target
previous observation May 2011, observation May-June 2014, and observation Sept. 2016
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.