Earth's Busy Neighborhood banner
Sample screen shot from A/CC's animated HTML5 Skychart Viewer.
Sample screen shot from
A/CC's Skychart Viewer
which requires HTML5
and JavaScript run in
browsers such as
FireFox 3.6.3+, IE10,
Opera, or Safari.

Legend - object IDs plus links to more info

Data compiled at 1327 UTC on 26 July 2015 for five known objects during a period of seven days from 23 to 29 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
BQ182013 BQ1811.8 LD+/- 10.6667 hours  departed
NG132015 NG1335.7 LD+/- 14 minutes  departed
OA262015 OA2611.49 LD  departed
OQ212015 OQ211.48 LDoutbound Moon buzzer
UW158436724 2011 UW1587.87 LD  departed
DateTfc.Time
23 July '15Rept. Line
24 July '15Rept. Line
25 July '15Rept. Line
26 July '15Rept. Line
27 July '15Rept. Line
28 July '15 Line
29 July '15 Line

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

2015 OA26   -     departed
Approximate diameter47 meters (H=24.305)
Closest Earth approach2.38 LD at 1118 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 #1 downloaded from JPL on 26 July 2015 UTC
based on 44 observations spanning 2 days
Optical observation  
  • reported from 12 observing codes during 1.9372 days: 104, 204, 595, 807, 954, 958, E23, F51, H36, I93, N55, U69
  • designation assigned to Pan-STARRS 1 observation at 1054 UT 23 July 2015
  • last observed at 0923 UT on 25 July 2015 by B. Haeusler via iTelescope Obs. Auberry
Links  
2015 OQ21   -   outbound Moon buzzer
Approximate diameter8 meters (H=28.121)
Closest Earth approach1.48 LD at 2359 UT on 23 July 2015
Inside Earth SOI22 to 25 July 2015
Inside ten LD of Earth18 to 29 July 2015
Closest Moon approach0.89 LD at 0941 UT on 24 July 2015
Inside one LD of Moon0354-1527 UT on 24 July 2015
Data based onJPL SSD orbit solution #4 downloaded from JPL on 26 July 2015 UTC
based on 40 observations spanning 4 days
Optical observation  
  • reported from 7 observing codes during 3.7287 days: 291, 474, 568, F51, H21, J69, J95
  • designation assigned to Pan-STARRS 1 observation at 1234 UT 19 July 2015
  • last observed at 0603 UT on 23 July 2015 by ARO Westfield
NotesNHATS target
Links  
2015 NG13   -     departed
Approximate diameter36 meters (H=24.89)
Closest Earth approach2.36 LD at 0903 UT on 21 June 2015 - Note: JPL reports an approach uncertainty of +/- 14 minutes
Inside Earth SOI20 to 21 June 2015
Inside ten LD of Earth12 to 29 June 2015
Data based onJPL SSD orbit solution #3 downloaded from JPL on 26 July 2015 UTC (dated 23 July 2015 local)
based on 15 observations spanning 10 days
Optical observation  
  • reported from 3 observing codes during 10.0254 days: 568, F51, J04
  • designation assigned to Pan-STARRS 1 observation at 0717 UT 12 July 2015
  • last observed at 0754 UT on 22 July 2015 by David Tholen's team on Mauna Kea
NotesNHATS target
Links  
2013 BQ18   -     departed
Approximate diameter29 meters (H=25.3)
Closest Earth approach7.87 LD at 0456 UT on 20 July 2015 - Note: JPL reports an approach uncertainty of +/- 10.6667 hours
Inside ten LD of Earth18 to 22 July 2015
Data based onJPL SSD orbit solution #3 downloaded from JPL on 15 July 2015 UTC (dated 13 June 2014 local)
based on 22 observations spanning one day
Optical observation  
    none recent
Notes
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 #58 downloaded from JPL on 22 July 2015 UTC
based on 290 observations spanning 2011-2015
Optical observation  
  • reported from 23 observing codes during 131.7677 days: 291, 691, 703, 807, B38, C23, C51, C77, F51, H21, J69, J95, K14, K95, L04, Q62, Q64, V59, V78, W19, W85, W88, Y00
  • first observed at 1049 UT on 11 March 2015 by the Spacewatch 1.8m telescope
  • last observed at 0515 UT on 21 July 2015 by Spirit Marsh Obs.
Notesradar target, NHATS target
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.