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Legend - object IDs plus links to more info

Data compiled at 1804 UTC on 28 Aug. 2015 for seventeen known objects during a period of seven days from 25 to 31 Aug. 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 HM1092.78 LD  departed
KS762014 KS7625.40 LD+/- 2 minutesapproaching
OA262015 OA26102.80 LD  departed
PK92015 PK935.89 LD  departed
PL572015 PL5748.5 LD+/- 25 minutes  departed
PL3072015 PL30766.23 LD+/- one minute  departed
PS562015 PS5694.20 LD+/- 2 minutes  departed
PS2282015 PS22815.83 LD+/- 3 minutes  departed
PT2272015 PT2279.65 LDinbound
PU2272015 PU22735.66 LD  departed
QH32015 QH36.76 LD  departed
QK2015 QK11.96 LD  departed
QK92015 QK912.76 LD  departed
QS82015 QS86.52 LD  departed
QT32015 QT34.15 LDpassing
QY82015 QY87.94 LD  departed
UW158436724 2011 UW15847.49 LD  departed
DateTfc.Time
25 Aug. '15Rept. Line
26 Aug. '15Rept. Line
27 Aug. '15Rept. Line
28 Aug. '15Rept. Line
29 Aug. '15Rept. Line
30 Aug. '15 Line
31 Aug. '15 Line

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

2015 QK9   -     departed
Approximate diameter34 meters (H=25.015)
Closest Earth approach7.13 LD at 0927 UT on 22 Aug. 2015
Inside ten LD of Earth20 to 24 Aug. 2015
Data based onJPL SSD orbit solution #2 downloaded from JPL on 26 Aug. 2015 UTC
based on 43 observations spanning 3 days
Optical observation  
  • reported from 3 observing codes during 3.3580 days: 474, 703, W85
  • designation assigned to Catalina Sky Survey observation at 0721 UT 22 Aug. 2015
  • last observed at 1557 UT on 25 Aug. 2015 by Mt. John Obs.
Links  
2015 QY8   -     departed
Approximate diameter9 meters (H=27.774)
Closest Earth approach1.97 LD at 0110 UT on 19 Aug. 2015
Inside Earth SOI17 to 20 Aug. 2015
Inside ten LD of Earth11 to 26 Aug. 2015
Closest Moon approach2.48 LD at 1649 UT on 18 Aug. 2015
Data based onJPL SSD orbit solution #2 downloaded from JPL on 28 Aug. 2015 UTC
based on 23 observations spanning 5 days
Optical observation  
  • reported from 3 observing codes during 5.2798 days: 291, 703, H21
  • first observed at 0507 UT on 22 Aug. 2015 by the Catalina Sky Survey
  • designation assigned to Catalina Sky Survey observation at 0559 UT 22 Aug. 2015
  • last observed at 1150 UT on 27 Aug. 2015 by the Spacewatch 1.8m telescope
NotesNHATS target
Links  
2015 QS8   -     departed
Approximate diameter15 meters (H=26.818)
Closest Earth approach5.00 LD at 1443 UT on 22 Aug. 2015
Inside ten LD of Earth17 to 27 Aug. 2015
Data based onJPL SSD orbit solution #2 downloaded from JPL on 24 Aug. 2015 UTC
based on 29 observations spanning one day
Optical observation  
  • reported from 5 observing codes during 1.7558 days: 104, 300, 703, H21, J95
  • designation assigned to Catalina Sky Survey observation at 0439 UT 22 Aug. 2015
  • last observed at 2247 UT on 23 Aug. 2015 by Great Shefford Obs.
Links  
2015 QT3   -   passing
Approximate diameter56 meters (H=23.922)
Closest Earth approach4.15 LD at 0254 UT on 28 Aug. 2015
Inside ten LD of Earth26 to 29 Aug. 2015
Data based onJPL SSD orbit solution #10 downloaded from JPL on 28 Aug. 2015 UTC
based on 120 observations spanning 7 days
Optical observation  
  • reported from 12 observing codes during 6.8064 days: 104, 151, 204, 291, 474, 595, 691, C47, H21, H36, J95, W87
  • designation assigned to Spacewatch 0.9m telescope observation at 0630 UT 21 Aug. 2015
  • last observed at 0151 UT on 28 Aug. 2015 by Great Shefford Obs.
Notesradar target
Links  
2015 QH3   -     departed
Approximate diameter14 meters (H=26.961)
Closest Earth approach4.38 LD at 1817 UT on 21 Aug. 2015
Inside ten LD of Earth16 to 27 Aug. 2015
Data based onJPL SSD orbit solution #3 downloaded from JPL on 24 Aug. 2015 UTC
based on 47 observations spanning 3 days
Optical observation  
  • reported from 7 observing codes during 3.5907 days: 474, 703, 958, H01, H21, I93, J95
  • designation assigned to Catalina Sky Survey observation at 0818 UT 20 Aug. 2015
  • last observed at 2229 UT on 23 Aug. 2015 by Great Shefford Obs.
NotesNHATS target
Links  
2015 QK   -     departed
Approximate diameter19 meters (H=26.25)
Closest Earth approach4.67 LD at 0254 UT on 19 Aug. 2015
Inside ten LD of Earth14 to 23 Aug. 2015
Data based onJPL SSD orbit solution #4 downloaded from JPL on 24 Aug. 2015 UTC
based on 71 observations spanning 2 days
Optical observation  
  • reported from 11 observing codes during 2.0646 days: 104, 160, 204, 587, 703, 958, H01, H21, H36, I93, J22
  • designation assigned to Catalina Sky Survey observation at 0625 UT 19 Aug. 2015
  • last observed at 0758 UT on 21 Aug. 2015 by ARO Westfield
Links  
2015 PL307   -     departed
Approximate diameter24 meters (H=25.75)
Closest Earth approach4.23 LD at 0438 UT on 2 Aug. 2015
Inside ten LD of Earth29 July until 5 Aug. 2015
Data based onJPL SSD orbit solution #1 downloaded from JPL on 21 Aug. 2015 UTC
based on 9 observations spanning 10 days
Optical observation  
  • reported from 2 observing codes during 10.0121 days: 568, F51
  • designation assigned to Pan-STARRS 1 observation at 1135 UT 9 Aug. 2015
  • last observed at 1152 UT on 19 Aug. 2015 by Marco Micheli via Mauna Kea
Links  
2015 PS228   -     departed
Approximate diameter5 meters (H=28.982)
Closest Earth approach2.41 LD at 1831 UT on 31 July 2015 - Note: JPL reports an approach uncertainty of +/- 3 minutes
Inside ten LD of Earth16 July until 16 Aug. 2015
Data based onJPL SSD orbit solution #5 downloaded from JPL on 21 Aug. 2015 UTC
based on 24 observations spanning 7 days
Optical observation  
  • reported from 4 observing codes during 7.1874 days: 291, 568, F51, H21
  • designation assigned to Pan-STARRS 1 observation at 0752 UT 12 Aug. 2015
  • last observed at 1222 UT on 19 Aug. 2015 by David Tholen's team on Mauna Kea
Notesrisk, NHATS target
Links  
2015 PU227   -     departed
Approximate diameter15 meters (H=26.73)
Closest Earth approach5.42 LD at 1257 UT on 7 Aug. 2015
Inside ten LD of Earth3 to 11 Aug. 2015
Data based onJPL SSD orbit solution #4 downloaded from JPL on 23 Aug. 2015 UTC
based on 27 observations spanning 10 days
Optical observation  
  • reported from 6 observing codes during 9.7988 days: 291, 568, F51, H01, H21, H36
  • designation assigned to Pan-STARRS 1 observation at 1000 UT 12 Aug. 2015
  • last observed at 0511 UT on 22 Aug. 2015 by ARO Westfield
NotesNHATS target
Links  
2015 PT227   -   inbound
Approximate diameter54 meters (H=23.989)
Closest Earth approach9.65 LD at 1604 UT on 29 Aug. 2015
Inside ten LD of Earth28 to 30 Aug. 2015
Data based onJPL SSD orbit solution #4 downloaded from JPL on 24 Aug. 2015 UTC
based on 23 observations spanning 11 days
Optical observation  
  • reported from 5 observing codes during 11.0902 days: 474, 568, 807, F51, H01
  • designation assigned to Pan-STARRS 1 observation at 0901 UT 12 Aug. 2015
  • last observed at 1111 UT on 23 Aug. 2015 by Mt. John Obs.
Links  
2015 PL57   -     departed
Approximate diameter23 meters (H=25.859)
Closest Earth approach9.13 LD at 1829 UT on 29 June 2015 - Note: JPL reports an approach uncertainty of +/- 25 minutes
Inside ten LD of Earth24 June until 5 July 2015
Data based onJPL SSD orbit solution #4 downloaded from JPL on 22 Aug. 2015 UTC
based on 22 observations spanning 11 days
Optical observation  
  • reported from 5 observing codes during 11.1277 days: 291, 474, 568, F51, W87
  • designation assigned to Pan-STARRS 1 observation at 1029 UT 10 Aug. 2015
  • last observed at 1333 UT on 21 Aug. 2015 by Mt. John Obs.
Notesrisk, NHATS target
Links  
2015 PS56   -     departed
Approximate diameter52 meters (H=24.078)
Closest Earth approach7.37 LD at 0705 UT on 31 July 2015 - Note: JPL reports an approach uncertainty of +/- 2 minutes
Inside ten LD of Earth29 July until 2 Aug. 2015
Data based onJPL SSD orbit solution #3 downloaded from JPL on 20 Aug. 2015 UTC
based on 24 observations spanning 10 days
Optical observation  
  • reported from 5 observing codes during 9.8935 days: 291, 568, F51, H36, I93
  • designation assigned to Pan-STARRS 1 observation at 0908 UT 10 Aug. 2015
  • last observed at 0635 UT on 20 Aug. 2015 by the Spacewatch 1.8m telescope
Links  
2015 PK9   -     departed
Approximate diameter63 meters (H=23.648)
Closest Earth approach5.77 LD at 0543 UT on 7 Aug. 2015
Inside ten LD of Earth3 to 11 Aug. 2015
Data based onJPL SSD orbit solution #13 downloaded from JPL on 27 Aug. 2015 UTC
based on 231 observations spanning 16 days
Optical observation  
  • reported from 22 observing codes during 16.0370 days: 106, 118, 461, 595, 958, C47, C95, E23, G45, H06, H21, H36, H45, I93, J69, J95, L04, Q62, U69, W98, Y00, Z99
  • designation assigned to SONEAR Obs. observation at 0224 UT 10 Aug. 2015
  • last observed at 0317 UT on 26 Aug. 2015 by ARO Westfield
NotesNHATS target
Links  
2015 OA26   -     departed
Approximate diameter46 meters (H=24.328)
Closest Earth approach2.38 LD at 1119 UT on 18 July 2015
Inside Earth SOIduring 18 July 2015
Inside ten LD of Earth14 to 22 July 2015
Data based onJPL SSD orbit solution #7 downloaded from JPL on 28 Aug. 2015 UTC
based on 78 observations spanning 29 days
Optical observation  
  • reported from 15 observing codes during 28.8073 days: 104, 204, 595, 691, 711, 807, 954, 958, E23, F51, H21, H36, I93, N55, U69
  • designation assigned to Pan-STARRS 1 observation at 1054 UT 23 July 2015
  • last observed at 0616 UT on 21 Aug. 2015 by ARO Westfield
Links  
2015 HM10   -     departed
Approximate diameter65 meters (H=23.6)
Closest Earth approach1.15 LD at 1838 UT on 7 July 2015
Inside Earth SOI6 to 8 July 2015
Inside ten LD of Earth2 to 13 July 2015
Closest Moon approach1.08 LD at 0811 UT on 8 July 2015
Data based onJPL SSD orbit solution #25 downloaded from JPL on 8 July 2015 UTC (dated 6 July 2015 local)
based on 89 observations spanning 78 days including radar
Optical observation  
  • reported from 16 observing codes during 129.2521 days: 160, 204, 291, 568, 807, 926, C47, F51, F65, H21, K91, K93, W84, W86, W87, Z81
  • designation assigned to Lori Allen via DECam observation at 0145 UT 19 April 2015
  • last observed at 0748 UT on 26 Aug. 2015 by ARO Westfield
Radar observation  
Notesradar target
Links  
2014 KS76   -   approaching
Approximate diameter17 meters (H=26.5)
Closest Earth approach8.65 LD at 2215 UT on 14 Sept. 2015 - Note: JPL reports an approach uncertainty of +/- 2 minutes
Inside ten LD of Earth11 to 17 Sept. 2015
Data based onJPL SSD orbit solution #9 downloaded from JPL on 28 Aug. 2015 UTC (dated 13 Aug. 2014 local)
based on 27 observations spanning 35 days
Optical observation  
    none recent
Notesrisk, NHATS target
previous passage May 2014 at 2.31 LD
Links  
436724 2011 UW158   -     departed
Approximate diameter426 meters (H=19.5)
Closest Earth approach6.40 LD at 1436 UT on 19 July 2015
Inside ten LD of Earth13 to 25 July 2015
Data based onJPL SSD orbit solution #81 downloaded from JPL on 28 Aug. 2015 UTC
based on 624 observations spanning 2011-2015
Optical observation  
  • reported from 39 observing codes during 169.6606 days: 006, 089, 104, 160, 291, 619, 691, 703, 807, 932, A53, B18, B38, C23, C51, C77, C95, D29, F51, F52, G40, H21, J69, J95, K14, K38, K95, L04, Q62, Q64, U69, V59, V78, W19, W85, W88, Y00, Z21, Z90
  • first observed at 1049 UT on 11 March 2015 by the Spacewatch 1.8m telescope
  • last observed at 0240 UT on 28 Aug. 2015 by McCarthy Obs.
Notesradar target, NHATS 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.