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Legend - object IDs plus links to more info

Data compiled at 1619 UTC on 24 July 2014 for three known objects during a period of seven days from 21 to 27 July 2014. Orange is for objects with a new JPL orbit solution (usually from new observation).


Full ID

AB22007 AB2202.9 LDdistant observation
PU12011 PU19.54 LDdeparted
RZ532013 RZ5312.4 LD+/- 20 minutesapproaching
21 July '14Rept. Line
22 July '14Rept. Line
23 July '14Rept. Line
24 July '14Rept. Line
25 July '14Rept. Line
26 July '14 Line
27 July '14 Line

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

2013 RZ53   -   approaching
Approximate diameter2 meters (H=31.1)
Closest Earth approach1.90 LD at 0403 UT on 9 Sept. 2014 - Note: JPL reports an approach uncertainty of +/- 20 minutes
Inside Earth SOI4 to 13 Sept. 2014
Inside ten LD of Earth5 Aug. until 12 Oct. 2014
Closest Moon approach2.26 LD at 0407 UT on 5 Sept. 2014
Data based onJPL SSD orbit solution #6 downloaded from JPL on 21 July 2014 UTC (dated 13 June 2014 local)
based on 31 observations spanning 3 days
Optical observation  
    none recent
previous passage Sept. 2013 at 0.63 LD
2011 PU1   -   departed
Approximate diameter34 meters (H=25.)
Closest Earth approach8.51 LD at 0234 UT on 17 July 2014
Inside ten LD of Earth12 to 21 July 2014
Data based onJPL SSD orbit solution #20 downloaded from JPL on 24 July 2014 UTC
based on 64 observations spanning 2011-2014
Optical observation  
  • reported from 2 observing codes during 110.3737 days: 291, 568
  • first observed at 0604 UT on 4 April 2014 by David Tholen's team on Mauna Kea
  • last observed at 1502 UT on 23 July 2014 by David Tholen's team on Mauna Kea
Notesradar target, potential mission destination
previous passage July 2011 at 0.87 LD
2007 AB2   -   distant observation
Approximate diameter295 meters (H=20.3)
Distance from Earth217.6 - 217.7 LD min-max during the observation period
Data based onJPL SSD orbit solution #39 downloaded from JPL on 23 July 2014 UTC
based on 430 observations spanning 2007-2014
Optical observation  
  • reported from one observing code during 0.403 hours: H36
  • first observed at 0805 UT on 23 July 2014 by Sandlot Obs.
  • last observed at 0829 UT on 23 July 2014 by Sandlot Obs.
Notesprevious passage Dec. 2006 at 5.4 LD, observation Feb. 2010, and observation May 2013


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.