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Legend - object IDs plus links to more info

Data compiled at 1754 UTC on 4 July 2015 for seven known objects during a period of seven days from 1 to 7 July 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 HM101.15 LDinbound
KK572015 KK578.67 LD+/- 5 minutesoutbound
MA542015 MA5414.72 LD  departed
MC2015 MC34.92 LD  departed
MO1162015 MO1164.94 LD+/- 3 minutesinbound
MZ532015 MZ5323.4 LD+/- 11 minutes  departed
UW158436724 2011 UW15816.90 LDapproaching
DateTfc.Time
1 July '15Rept. Line
2 July '15Rept. Line
3 July '15Rept. Line
4 July '15Rept. Line
5 July '15Rept. Line
6 July '15 Line
7 July '15 Line

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

2015 MO116   -   inbound
Approximate diameter53 meters (H=24.03)
Closest Earth approach4.94 LD at 0008 UT on 7 July 2015 - Note: JPL reports an approach uncertainty of +/- 3 minutes
Inside ten LD of Earth2 to 11 July 2015
Data based onJPL SSD orbit solution #1 downloaded from JPL on 1 July 2015 UTC
based on 22 observations spanning one day
Optical observation  
  • reported from 6 observing codes during 1.4405 days: 118, 160, 958, F51, H21, J95
  • designation assigned to Pan-STARRS 1 observation at 1030 UT 29 June 2015
  • last observed at 2105 UT on 30 June 2015 by Castelmartini Obs.
Links  
2015 MA54   -     departed
Approximate diameter29 meters (H=25.332)
Closest Earth approach6.80 LD at 0607 UT on 25 June 2015
Inside ten LD of Earth22 to 28 June 2015
Data based onJPL SSD orbit solution #6 downloaded from JPL on 25 June 2015 UTC
based on 69 observations spanning 4 days
Optical observation  
  • reported from 11 observing codes during 4.0661 days: 104, 203, 691, 703, 926, 958, H21, I52, I93, J69, J95
  • designation assigned to Catalina Sky Survey observation at 0454 UT 20 June 2015
  • last observed at 0629 UT on 24 June 2015 by Tenagra II Obs.
Notesradar target
Links  
2015 MZ53   -     departed
Approximate diameter10 meters (H=27.584)
Closest Earth approach5.56 LD at 0011 UT on 9 June 2015 - Note: JPL reports an approach uncertainty of +/- 11 minutes
Inside ten LD of Earth31 May until 17 June 2015
Data based onJPL SSD orbit solution #1 downloaded from JPL on 22 June 2015 UTC
based on 7 observations spanning 2 days
Optical observation  
  • reported from 2 observing codes during 2.0279 days: 568, F51
  • designation assigned to Pan-STARRS 1 observation at 1223 UT 19 June 2015
  • last observed at 1303 UT on 21 June 2015 by David Tholen's team on Mauna Kea
NotesNHATS target
Links  
2015 MC   -     departed
Approximate diameter49 meters (H=24.185)
Closest Earth approach6.73 LD at 2019 UT on 10 June 2015
Inside ten LD of Earth6 to 15 June 2015
Data based onJPL SSD orbit solution #9 downloaded from JPL on 28 June 2015 UTC
based on 92 observations spanning 10 days
Optical observation  
  • reported from 17 observing codes during 10.6353 days: 291, 461, 587, 703, 807, 926, B49, C47, C77, F51, G40, H21, H45, I52, I93, J95, U69
  • designation assigned to Catalina Sky Survey observation at 0831 UT 17 June 2015
  • last observed at 2346 UT on 27 June 2015 by St. Pardon de Conques Obs.
NotesNHATS target
Links  
2015 KK57   -   outbound
Approximate diameter11 meters (H=27.5)
Closest Earth approach8.32 LD at 0401 UT on 23 June 2015 - Note: JPL reports an approach uncertainty of +/- 5 minutes
Inside ten LD of Earth7 June until 11 July 2015
Data based onJPL SSD orbit solution #6 downloaded from JPL on 16 June 2015 UTC
based on 24 observations spanning 26 days
Optical observation  
  • reported from 4 observing codes during 25.9388 days: 291, 568, 675, F51
  • designation assigned to Pan-STARRS 1 observation at 1023 UT 19 May 2015
  • last observed at 0855 UT on 14 June 2015 by the Spacewatch 1.8m telescope
NotesNHATS target
Links  
2015 HM10   -   inbound
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 #15 downloaded from JPL on 4 July 2015 UTC
based on 81 observations spanning 75 days
Optical observation  
  • reported from 9 observing codes during 75.6468 days: 291, 568, 926, F51, K91, K93, W84, W86, W87
  • designation assigned to Lori Allen via DECam observation at 0145 UT 19 April 2015
  • last observed at 1717 UT on 3 July 2015 by LCOGT Sutherland A
Notesradar target
Links  
436724 2011 UW158   -   approaching
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 #50 downloaded from JPL on 2 July 2015 UTC
based on 196 observations spanning 2011-2015
Optical observation  
  • reported from 9 observing codes during 111.9495 days: 291, 691, 703, 807, C51, F51, K95, Q62, Y00
  • first observed at 1049 UT on 11 March 2015 by the Spacewatch 1.8m telescope
  • last observed at 0937 UT on 1 July 2015 by Steven M. Tilley via iTelescope Obs. Siding Spring
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.