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Legend - object IDs plus links to more info

Data compiled at 1732 UTC on 29 May 2015 for eighteen known objects during a period of seven days from 26 May to 1 June 2015. Orange is for objects with a new JPL orbit solution (usually from new observation).

Chart
ID

Full ID
Period
Closest
Passage
Uncertainty

Status
HM102015 HM1063.7 LD+/- 1.1167 hoursapproaching
JC12015 JC160.31 LD  departed
JR12015 JR130.84 LD  departed
KA2015 KA14.57 LD  departed
KA1222015 KA12210.03 LD+/- 3 minutesapproaching
KE2015 KE16.28 LD+/- 5 minutes  departed
KK2015 KK57.36 LD  departed
KK572015 KK5711.3 LD+/- 17 minutesapproaching
KM572015 KM578.61 LDapproaching
KO1222015 KO1225.36 LD  departed
KQ1202015 KQ1208.54 LDinbound
KT562015 KT5618.89 LD  departed
KU1212015 KU12122.68 LD+/- 3 minutesapproaching
KW1202015 KW1201.07 LDpassing
KW1212015 KW12110.65 LD  departed intruder
KY562015 KY566.09 LD  departed
KZ1212015 KZ12117.51 LD  departed
UW1582011 UW15860.36 LDapproaching
DateTfc.Time
26 May '15Rept. Line
27 May '15Rept. Line
28 May '15Rept. Line
29 May '15Rept. Line
30 May '15Rept. Line
31 May '15 Line
1 June '15 Line

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

2015 KO122   -     departed
Approximate diameter13 meters (H=27.032)
Closest Earth approach2.90 LD at 1521 UT on 24 May 2015
Inside ten LD of Earth21 to 27 May 2015
Data based onJPL SSD orbit solution #1 downloaded from JPL on 27 May 2015 UTC
based on 44 observations spanning one day
Optical observation  
  • reported from 6 observing codes during 1.1345 days: 204, 926, G96, I52, I93, J95
  • designation assigned to Mt. Lemmon Survey observation at 0608 UT 26 May 2015
  • last observed at 0922 UT on 27 May 2015 by Tenagra II Obs.
Links  
2015 KA122   -   approaching
Approximate diameter78 meters (H=23.194)
Closest Earth approach3.31 LD at 0030 UT on 6 June 2015 - Note: JPL reports an approach uncertainty of +/- 3 minutes
Inside ten LD of Earth1 to 10 June 2015
Data based onJPL SSD orbit solution #3 downloaded from JPL on 29 May 2015 UTC
based on 58 observations spanning 4 days
Optical observation  
  • reported from 11 observing codes during 3.8985 days: 203, 204, 300, 703, 718, 926, F51, H21, I52, I93, K38
  • designation assigned to Catalina Sky Survey observation at 0909 UT 25 May 2015
  • last observed at 0643 UT on 29 May 2015 by Wiggins Obs.
Links  
2015 KZ121   -     departed
Approximate diameter29 meters (H=25.356)
Closest Earth approach6.18 LD at 0239 UT on 20 May 2015
Inside ten LD of Earth17 to 22 May 2015
Data based onJPL SSD orbit solution #2 downloaded from JPL on 29 May 2015 UTC
based on 30 observations spanning 3 days
Optical observation  
  • reported from 7 observing codes during 2.9985 days: 204, 703, 807, 926, F51, I52, J95
  • designation assigned to Catalina Sky Survey observation at 0503 UT 25 May 2015
  • last observed at 0500 UT on 28 May 2015 by Robert Holmes via Cerro Tololo Inter-American Obs.
Links  
2015 KW121   -     departed intruder
Approximate diameter20 meters (H=26.134)
Closest Earth approach0.74 LD at 1801 UT on 23 May 2015
Inside Earth-Moon system1437-2124 UT on 23 May 2015
Inside Earth SOI23 to 24 May 2015
Inside ten LD of Earth21 to 25 May 2015
Closest Moon approach1.69 LD at 1728 UT on 23 May 2015
Data based onJPL SSD orbit solution #3 downloaded from JPL on 29 May 2015 UTC
based on 29 observations spanning 3 days
Optical observation  
  • reported from 6 observing codes during 2.8142 days: 300, 703, 926, F51, H21, I52
  • designation assigned to Catalina Sky Survey observation at 0905 UT 25 May 2015
  • last observed at 0437 UT on 28 May 2015 by ARO Westfield
Links  
2015 KU121   -   approaching
Approximate diameter86 meters (H=22.973)
Closest Earth approach7.50 LD at 1832 UT on 7 June 2015 - Note: JPL reports an approach uncertainty of +/- 3 minutes
Inside ten LD of Earth5 to 9 June 2015
Data based onJPL SSD orbit solution #3 downloaded from JPL on 29 May 2015 UTC
based on 54 observations spanning 5 days
Optical observation  
  • reported from 11 observing codes during 5.0343 days: 673, 807, 926, A13, B74, F51, G96, H01, H21, I52, I93
  • designation assigned to Mt. Lemmon Survey observation at 0807 UT 24 May 2015
  • last observed at 0857 UT on 29 May 2015 by Tenagra II Obs.
Links  
2015 KW120   -   passing
Approximate diameter21 meters (H=26.014)
Closest Earth approach1.07 LD at 1153 UT on 29 May 2015
Inside Earth SOI28 to 30 May 2015
Inside ten LD of Earth26 May until 1 June 2015
Closest Moon approach1.72 LD at 0557 UT on 29 May 2015
Data based onJPL SSD orbit solution #6 downloaded from JPL on 29 May 2015 UTC
based on 88 observations spanning 4 days
Optical observation  
  • reported from 15 observing codes during 4.6818 days: 204, 300, 587, 673, 703, 926, A48, E10, G40, G96, H01, H21, I52, V30, W88
  • designation assigned to Catalina Sky Survey observation at 0701 UT 24 May 2015
  • last observed at 2323 UT on 28 May 2015 by Povegliano Veronese Obs.
Links  
2015 KQ120   -   inbound
Approximate diameter15 meters (H=26.754)
Closest Earth approach8.54 LD at 2036 UT on 31 May 2015
Inside ten LD of Earth28 May until 4 June 2015
Data based onJPL SSD orbit solution #2 downloaded from JPL on 28 May 2015 UTC
based on 18 observations spanning 6 days
Optical observation  
  • reported from 4 observing codes during 5.9539 days: 204, 568, 926, F51
  • designation assigned to Pan-STARRS 1 observation at 1130 UT 22 May 2015
  • last observed at 1023 UT on 28 May 2015 by Tenagra II Obs.
NotesNHATS target
Links  
2015 KM57   -   approaching
Approximate diameter29 meters (H=25.359)
Closest Earth approach6.61 LD at 1635 UT on 3 June 2015
Inside ten LD of Earth1 to 6 June 2015
Data based onJPL SSD orbit solution #3 downloaded from JPL on 29 May 2015 UTC
based on 31 observations spanning 7 days
Optical observation  
  • reported from 5 observing codes during 6.9397 days: 568, 807, F51, H21, W84
  • first observed at 0815 UT on 21 May 2015 by Lori Allen via DECam
  • designation assigned to Pan-STARRS 1 observation at 1132 UT 21 May 2015
  • last observed at 0648 UT on 28 May 2015 by ARO Westfield
Links  
2015 KK57   -   approaching
Approximate diameter10 meters (H=27.667)
Closest Earth approach8.32 LD at 0351 UT on 23 June 2015 - Note: JPL reports an approach uncertainty of +/- 17 minutes
Inside ten LD of Earth7 June until 11 July 2015
Data based onJPL SSD orbit solution #2 downloaded from JPL on 27 May 2015 UTC
based on 13 observations spanning 7 days
Optical observation  
  • reported from 3 observing codes during 7.1578 days: 291, 568, F51
  • designation assigned to Pan-STARRS 1 observation at 1023 UT 19 May 2015
  • last observed at 1410 UT on 26 May 2015 by Marco Micheli via Mauna Kea
NotesNHATS target
Links  
2015 KY56   -     departed
Approximate diameter16 meters (H=26.593)
Closest Earth approach5.66 LD at 0539 UT on 25 May 2015
Inside ten LD of Earth22 to 28 May 2015
Data based onJPL SSD orbit solution #2 downloaded from JPL on 26 May 2015 UTC
based on 22 observations spanning 2 days
Optical observation  
  • reported from 3 observing codes during 1.8401 days: 926, F51, I93
  • designation assigned to Pan-STARRS 1 observation at 1016 UT 22 May 2015
  • last observed at 0626 UT on 24 May 2015 by Tenagra II Obs.
Links  
2015 KT56   -     departed
Approximate diameter16 meters (H=26.622)
Closest Earth approach9.95 LD at 1411 UT on 18 May 2015
Inside ten LD of Earth18 to 19 May 2015
Data based onJPL SSD orbit solution #3 downloaded from JPL on 26 May 2015 UTC
based on 18 observations spanning 3 days
Optical observation  
  • reported from 4 observing codes during 2.9607 days: 291, 926, F51, J95
  • designation assigned to Pan-STARRS 1 observation at 0752 UT 21 May 2015
  • last observed at 0655 UT on 24 May 2015 by Tenagra II Obs.
Links  
2015 KK   -     departed
Approximate diameter32 meters (H=25.096)
Closest Earth approach5.47 LD at 1704 UT on 15 May 2015
Inside ten LD of Earth14 to 17 May 2015
Data based onJPL SSD orbit solution #2 downloaded from JPL on 23 May 2015 UTC
based on 44 observations spanning 4 days
Optical observation  
  • reported from 6 observing codes during 4.2149 days: 291, 474, 703, 807, 926, H01
  • designation assigned to Catalina Sky Survey observation at 0759 UT 18 May 2015
  • last observed at 1308 UT on 22 May 2015 by Mt. John Obs.
Links  
2015 KE   -     departed
Approximate diameter19 meters (H=26.216)
Closest Earth approach1.60 LD at 2209 UT on 3 May 2015 - Note: JPL reports an approach uncertainty of +/- 5 minutes
Inside Earth SOI1 to 6 May 2015
Inside ten LD of Earth20 April until 17 May 2015
Closest Moon approach1.64 LD at 0251 UT on 5 May 2015
Data based onJPL SSD orbit solution #6 downloaded from JPL on 26 May 2015 UTC
based on 76 observations spanning 8 days
Optical observation  
  • reported from 12 observing codes during 8.0687 days: 291, 474, 568, 595, 703, 807, 926, H01, H21, H36, H45, I52
  • designation assigned to Catalina Sky Survey observation at 0502 UT 18 May 2015
  • last observed at 0641 UT on 26 May 2015 by the Spacewatch 1.8m telescope
Notesrisk, NHATS target
Links  
2015 KA   -     departed
Approximate diameter19 meters (H=26.207)
Closest Earth approach6.23 LD at 1927 UT on 15 May 2015
Inside ten LD of Earth9 to 21 May 2015
Data based onJPL SSD orbit solution #7 downloaded from JPL on 25 May 2015 UTC
based on 81 observations spanning 7 days
Optical observation  
  • reported from 10 observing codes during 7.1175 days: 291, 474, 511, 595, 703, 926, G96, H01, H21, I52
  • designation assigned to Catalina Sky Survey observation at 0532 UT 18 May 2015
  • last observed at 0821 UT on 25 May 2015 by Steward Obs. Mt. Lemmon Station
NotesNHATS target
Links  
2015 JR1   -     departed
Approximate diameter19 meters (H=26.256)
Closest Earth approach6.97 LD at 1718 UT on 7 May 2015
Inside ten LD of Earth3 to 12 May 2015
Data based onJPL SSD orbit solution #2 downloaded from JPL on 23 May 2015 UTC
based on 21 observations spanning 9 days
Optical observation  
  • reported from 5 observing codes during 8.9488 days: 703, H21, I52, I93, J95
  • designation assigned to Catalina Sky Survey observation at 0717 UT 13 May 2015
  • last observed at 0603 UT on 22 May 2015 by ARO Westfield
NotesNHATS target
Links  
2015 JC1   -     departed
Approximate diameter13 meters (H=27.099)
Closest Earth approach3.54 LD at 1752 UT on 8 May 2015
Inside ten LD of Earth5 to 11 May 2015
Data based onJPL SSD orbit solution #4 downloaded from JPL on 23 May 2015 UTC
based on 47 observations spanning 10 days
Optical observation  
  • reported from 9 observing codes during 10.0657 days: 474, 568, 807, 926, G96, H01, H36, I52, J95
  • designation assigned to Mt. Lemmon Survey observation at 0809 UT 12 May 2015
  • last observed at 0943 UT on 22 May 2015 by David Tholen's team on Mauna Kea
Notesrisk
Links  
2015 HM10   -   approaching
Approximate diameter58 meters (H=23.818)
Closest Earth approach1.15 LD at 1814 UT on 7 July 2015 - Note: JPL reports an approach uncertainty of +/- 1.1167 hours
Inside Earth SOI6 to 8 July 2015
Inside ten LD of Earth2 to 13 July 2015
Closest Moon approach1.08 LD at 0748 UT on 8 July 2015
Data based onJPL SSD orbit solution #4 downloaded from JPL on 19 May 2015 UTC
based on 20 observations spanning 29 days
Optical observation  
  • reported from 4 observing codes during 29.2889 days: 291, 568, F51, W84
  • designation assigned to Lori Allen via DECam observation at 0145 UT 19 April 2015
  • last observed at 0841 UT on 18 May 2015 by Pan-STARRS 1
Links  
2011 UW158   -   approaching
Approximate diameter446 meters (H=19.4)
Closest Earth approach6.40 LD at 1437 UT on 19 July 2015
Inside ten LD of Earth13 to 25 July 2015
Data based onJPL SSD orbit solution #44 downloaded from JPL on 24 May 2015 UTC
based on 159 observations spanning 2011-2015
Optical observation  
  • reported from 4 observing codes during 72.8917 days: 291, 703, F51, K95
  • first observed at 1049 UT on 11 March 2015 by the Spacewatch 1.8m telescope
  • last observed at 0813 UT on 23 May 2015 by Pan-STARRS 1
NotesNHATS target
previous observation Oct.-Dec. 2011 and observation March-Dec. 2013
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.