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Legend - object IDs plus links to more info

Data compiled at 1659 UTC on 18 April 2015 for eighteen known objects during a period of seven days from 15 to 21 April 2015. White type highlights objects with just announced discovery, and orange is for objects with a new JPL orbit solution (usually from new observation).

Chart
ID

Full ID
Period
Closest
Passage
Uncertainty

Status
CT262007 CT2656.8 LD  distant
DU2015 DU24.77 LD  departed
FQ3322015 FQ33265.1 LD+/- 17 minutes  departed
GA12015 GA12.49 LDoutbound
GB12015 GB16.46 LDoutbound
GB62015 GB631.1 LD+/- 10 minutes  departed
GB142015 GB1420.5 LD+/- 20 minutesapproaching
GE12015 GE15.64 LD  departed
GK2015 GK4.07 LD  departed
GL2015 GL6.92 LD  departed
GL132015 GL130.48 LDoutbound intruder
GU2015 GU7.09 LD  departed intruder
GV2015 GV31.19 LD+/- 2 minutes  departed
GY52015 GY569.2 LD+/- 34 minutes  departed
GZ2015 GZ30.60 LD  departed
GZ52015 GZ521.39 LD  departed
HJ2015 HJ9.37 LD  departed
WP3622014 WP362399.0 LD  distant
DateTfc.Time
15 April '15Rept. Line
16 April '15Rept. Line
17 April '15Rept. Line
18 April '15Rept. Line
19 April '15Rept. Line
20 April '15 Line
21 April '15 Line

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

2015 HJ   -     departed
Approximate diameter13 meters (H=27.154)
Closest Earth approach9.34 LD at 1421 UT on 14 April 2015
Inside ten LD of Earth12 to 16 April 2015
Data based onJPL SSD orbit solution #1 downloaded from JPL on 18 April 2015 UTC
based on 24 observations spanning 2 days
Optical observation  
  • reported from 4 observing codes during 2.0668 days: 474, 926, G96, I52
  • designation assigned to Mt. Lemmon Survey observation at 0734 UT 16 April 2015
  • last observed at 0911 UT on 18 April 2015 by Tenagra II Obs.
Links  
2015 GB14   -   approaching
Approximate diameter30 meters (H=25.255)
Closest Earth approach8.94 LD at 1531 UT on 28 April 2015 - Note: JPL reports an approach uncertainty of +/- 20 minutes
Inside ten LD of Earth27 to 30 April 2015
Data based onJPL SSD orbit solution #1 downloaded from JPL on 17 April 2015 UTC
based on 17 observations spanning 2 days
Optical observation  
  • reported from 4 observing codes during 1.8861 days: 807, 926, G96, I52
  • designation assigned to Mt. Lemmon Survey observation at 0816 UT 15 April 2015
  • last observed at 0532 UT on 17 April 2015 by Steward Obs. Mt. Lemmon Station
Links  
2015 GL13   -   outbound intruder
Approximate diameter6 meters (H=28.864)
Closest Earth approach0.48 LD at 0752 UT on 16 April 2015
Inside Earth-Moon system0107-1437 UT on 16 April 2015
Inside Earth SOI15 to 17 April 2015
Inside ten LD of Earth13 to 19 April 2015
Closest Moon approach0.44 LD at 1437 UT on 16 April 2015
Inside one LD of Moon0739-2135 UT on 16 April 2015
Data based onJPL SSD orbit solution #2 downloaded from JPL on 17 April 2015 UTC
based on 40 observations spanning one day
Optical observation  
  • reported from 7 observing codes during 18.074 hours: 104, 461, 587, 595, 703, F51, J95
  • designation assigned to Catalina Sky Survey observation at 0802 UT 15 April 2015
  • last observed at 0206 UT on 16 April 2015 by Great Shefford Obs.
Links  
2015 GB6   -     departed
Approximate diameter18 meters (H=26.401)
Closest Earth approach8.67 LD at 2225 UT on 3 April 2015 - Note: JPL reports an approach uncertainty of +/- 10 minutes
Inside ten LD of Earth2 to 5 April 2015
Data based onJPL SSD orbit solution #1 downloaded from JPL on 13 April 2015 UTC
based on 14 observations spanning 2 days
Optical observation  
  • reported from 3 observing codes during 2.1263 days: 291, G96, H21
  • designation assigned to Mt. Lemmon Survey observation at 0714 UT 11 April 2015
  • last observed at 1016 UT on 13 April 2015 by the Spacewatch 1.8m telescope
Links  
2015 GZ5   -     departed
Approximate diameter27 meters (H=25.517)
Closest Earth approach6.52 LD at 0001 UT on 9 April 2015
Inside ten LD of Earth6 to 11 April 2015
Data based onJPL SSD orbit solution #2 downloaded from JPL on 15 April 2015 UTC
based on 30 observations spanning 3 days
Optical observation  
  • reported from 5 observing codes during 3.3102 days: 204, 291, 474, 703, 807
  • designation assigned to Catalina Sky Survey observation at 0628 UT 11 April 2015
  • last observed at 1355 UT on 14 April 2015 by Mt. John Obs.
Links  
2015 GY5   -     departed
Approximate diameter41 meters (H=24.588)
Closest Earth approach8.64 LD at 1509 UT on 25 March 2015 - Note: JPL reports an approach uncertainty of +/- 34 minutes
Inside ten LD of Earth24 to 27 March 2015
Data based onJPL SSD orbit solution #2 downloaded from JPL on 14 April 2015 UTC
based on 21 observations spanning 3 days
Optical observation  
  • reported from 4 observing codes during 3.1702 days: 291, 926, F51, G96
  • designation assigned to Mt. Lemmon Survey observation at 0600 UT 10 April 2015
  • last observed at 1005 UT on 13 April 2015 by Pan-STARRS 1
Links  
2015 GE1   -     departed
Approximate diameter24 meters (H=25.752)
Closest Earth approach3.37 LD at 0108 UT on 13 April 2015
Inside ten LD of Earth8 to 17 April 2015
Data based onJPL SSD orbit solution #3 downloaded from JPL on 15 April 2015 UTC
based on 100 observations spanning 4 days
Optical observation  
  • reported from 13 observing codes during 4.2717 days: 204, 300, 461, 474, 595, 703, 900, 926, C77, H21, I93, J95, O75
  • designation assigned to Catalina Sky Survey observation at 0421 UT 11 April 2015
  • last observed at 1052 UT on 15 April 2015 by Tenagra II Obs.
Links  
2015 GB1   -   outbound
Approximate diameter16 meters (H=26.644)
Closest Earth approach6.00 LD at 1426 UT on 13 April 2015
Inside ten LD of Earth8 to 18 April 2015
Data based onJPL SSD orbit solution #2 downloaded from JPL on 13 April 2015 UTC
based on 25 observations spanning 2 days
Optical observation  
  • reported from 5 observing codes during 2.0458 days: 291, 703, H21, I93, J95
  • designation assigned to Catalina Sky Survey observation at 1032 UT 11 April 2015
  • last observed at 1138 UT on 13 April 2015 by the Spacewatch 1.8m telescope
Notesrisk
Links  
2015 GA1   -   outbound
Approximate diameter16 meters (H=26.62)
Closest Earth approach2.49 LD at 0712 UT on 16 April 2015
Inside ten LD of Earth13 to 18 April 2015
Data based onJPL SSD orbit solution #5 downloaded from JPL on 18 April 2015 UTC
based on 61 observations spanning 4 days
Optical observation  
  • reported from 9 observing codes during 4.1921 days: 204, 474, 754, 807, 926, G96, H21, I93, J95
  • designation assigned to Mt. Lemmon Survey observation at 0640 UT 11 April 2015
  • last observed at 1117 UT on 15 April 2015 by Tenagra II Obs.
Links  
2015 GZ   -     departed
Approximate diameter21 meters (H=26.058)
Closest Earth approach8.70 LD at 2332 UT on 7 April 2015
Inside ten LD of Earth6 to 9 April 2015
Data based onJPL SSD orbit solution #4 downloaded from JPL on 16 April 2015 UTC
based on 37 observations spanning 4 days
Optical observation  
  • reported from 8 observing codes during 4.3425 days: 204, 474, 807, 926, G96, H21, I93, J95
  • designation assigned to Mt. Lemmon Survey observation at 0502 UT 11 April 2015
  • last observed at 1315 UT on 15 April 2015 by Mt. John Obs.
Links  
2015 GV   -     departed
Approximate diameter36 meters (H=24.893)
Closest Earth approach9.48 LD at 0733 UT on 4 April 2015 - Note: JPL reports an approach uncertainty of +/- 2 minutes
Inside ten LD of Earth3 to 5 April 2015
Data based onJPL SSD orbit solution #1 downloaded from JPL on 12 April 2015 UTC
based on 23 observations spanning one day
Optical observation  
  • reported from 7 observing codes during 1.6833 days: 291, 703, 926, G96, H21, I93, J95
  • designation assigned to Catalina Sky Survey observation at 0645 UT 10 April 2015
  • last observed at 2309 UT on 11 April 2015 by St. Pardon de Conques Obs.
Links  
2015 GU   -     departed intruder
Approximate diameter7 meters (H=28.457)
Closest Earth approach0.29 LD at 0535 UT on 12 April 2015
Inside Earth-Moon system2039 on 11 April until 1431 UT on 12 April 2015
Inside Earth SOI11 to 13 April 2015
Inside ten LD of Earth8 to 16 April 2015
Closest Moon approach0.62 LD at 1029 UT on 12 April 2015
Inside one LD of Moon0245-1823 UT on 12 April 2015
Data based onJPL SSD orbit solution #3 downloaded from JPL on 15 April 2015 UTC
based on 87 observations spanning one day
Optical observation  
  • reported from 10 observing codes during 20.059 hours: 204, 300, 461, 474, 703, 900, A50, C77, J95, O75
  • designation assigned to Catalina Sky Survey observation at 0525 UT 11 April 2015
  • last observed at 0129 UT on 12 April 2015 by Great Shefford Obs.
Links  
2015 GL   -     departed
Approximate diameter31 meters (H=25.158)
Closest Earth approach6.03 LD at 0552 UT on 13 April 2015
Inside ten LD of Earth9 to 17 April 2015
Data based onJPL SSD orbit solution #5 downloaded from JPL on 16 April 2015 UTC
based on 33 observations spanning 7 days
Optical observation  
  • reported from 6 observing codes during 7.1704 days: 104, 204, 926, F51, H21, J95
  • designation assigned to Pan-STARRS 1 observation at 0711 UT 9 April 2015
  • last observed at 1117 UT on 16 April 2015 by Tenagra II Obs.
Links  
2015 GK   -     departed
Approximate diameter23 meters (H=25.824)
Closest Earth approach2.81 LD at 2131 UT on 13 April 2015
Inside ten LD of Earth10 to 17 April 2015
Data based onJPL SSD orbit solution #4 downloaded from JPL on 18 April 2015 UTC
based on 42 observations spanning 4 days
Optical observation  
  • reported from 8 observing codes during 4.7042 days: 106, 291, 461, 587, 703, C43, G96, J95
  • designation assigned to Catalina Sky Survey observation at 0542 UT 9 April 2015
  • last observed at 2236 UT on 13 April 2015 by Great Shefford Obs.
Links  
2015 FQ332   -     departed
Approximate diameter29 meters (H=25.3)
Closest Earth approach3.85 LD at 1143 UT on 4 March 2015 - Note: JPL reports an approach uncertainty of +/- 17 minutes
Inside ten LD of Earth26 Feb. until 10 March 2015
Data based onJPL SSD orbit solution #4 downloaded from JPL on 12 April 2015 UTC
based on 16 observations spanning 14 days
Optical observation  
  • reported from 3 observing codes during 13.8065 days: 291, F51, H21
  • designation assigned to Pan-STARRS 1 observation at 1309 UT 28 March 2015
  • last observed at 0830 UT on 11 April 2015 by ARO Westfield
Links  
2015 DU   -     departed
Approximate diameter15 meters (H=26.708)
Closest Earth approach7.98 LD at 0959 UT on 23 Feb. 2015
Inside ten LD of Earth8 Feb. until 9 March 2015
Data based onJPL SSD orbit solution #17 downloaded from JPL on 14 April 2015 UTC
based on 91 observations spanning 95 days including radar
Optical observation  
  • reported from 11 observing codes during 94.9078 days: 246, 461, 568, 703, 807, B18, F51, H21, H36, J95, V37
  • first observed at 1105 UT on 8 Jan. 2015 by Pan-STARRS 1
  • designation assigned to Pan-STARRS 1 observation at 1552 UT 17 Feb. 2015
  • last observed at 0853 UT on 13 April 2015 by Pan-STARRS 1
Radar observation  
Notesradar target, NHATS target
Links  
2014 WP362   -     distant
Approximate diameter81 meters (H=23.1)
Distance from Earth452.1 - 466.2 LD min-max during the observation period
Data based onJPL SSD orbit solution #5 downloaded from JPL on 10 April 2015 UTC
based on 19 observations spanning 2014-2015
Optical observation  
  • reported from one observing code during 10.0094 days: 309
  • first observed at 0926 UT on 30 March 2015 by Marco Micheli via Cerro Paranal
  • last observed at 0940 UT on 9 April 2015 by Marco Micheli via Cerro Paranal
Notesprevious passage June 2011 at 8.2 LD +/- 24 mins. uncertainty (unobserved) and observation Nov. 2014
Links  
2007 CT26   -     distant
Approximate diameter71 meters (H=23.4)
Distance from Earth59.4 - 60.1 LD min-max during the observation period
Data based onJPL SSD orbit solution #19 downloaded from JPL on 17 April 2015 UTC
based on 113 observations spanning 2007-2015
Optical observation  
  • reported from one observing code during 23.059 hours: 474
  • first observed at 1225 UT on 15 April 2015 by Mt. John Obs.
  • last observed at 1128 UT on 16 April 2015 by Mt. John Obs.
Notesprevious passage Feb. 2007 at 2.40 LD and observation March 2011
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.