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Legend - object IDs plus links to more info

Data compiled at 1825 UTC on 19 Dec. 2014 for eleven known objects during a period of seven days from 16 to 22 Dec. 2014. Orange is for objects with a new JPL orbit solution (usually from new observation).

Chart
ID

Full ID
Period
Closest
Passage
Uncertainty

Status
UV2102014 UV2107.25 LD+/- 2 minutesoutbound
WB3662014 WB36615.98 LD  departed
WD3662014 WD36626.01 LD  departed
WO3652014 WO36537.05 LD  departed
WR3622014 WR36266.70 LD  departed
WU2002014 WU2002.58 LDoutbound
WX2022014 WX2022.47 LDoutbound intruder
WY3622014 WY36294.6 LD+/- 37 minutes  departed
XB62014 XB68.03 LD  departed
XC82014 XC812.42 LD  departed
XO72014 XO724.87 LD+/- 2 minutes  departed
DateTfc.Time
16 Dec. '14Rept. Line
17 Dec. '14Rept. Line
18 Dec. '14Rept. Line
19 Dec. '14Rept. Line
20 Dec. '14Rept. Line
21 Dec. '14 Line
22 Dec. '14 Line

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

2014 XC8   -     departed
Approximate diameter19 meters (H=26.235)
Closest Earth approach4.13 LD at 1747 UT on 11 Dec. 2014
Inside ten LD of Earth8 to 15 Dec. 2014
Data based onJPL SSD orbit solution #2 downloaded from JPL on 19 Dec. 2014 UTC
based on 24 observations spanning 4 days
Optical observation  
  • reported from 4 observing codes during 4.0979 days: 291, 703, 958, H36
  • designation assigned to Catalina Sky Survey observation at 0539 UT 15 Dec. 2014
  • last observed at 0800 UT on 19 Dec. 2014 by the Spacewatch 1.8m telescope
Notesrisk
Links  
2014 XO7   -     departed
Approximate diameter14 meters (H=26.956)
Closest Earth approach3.21 LD at 2025 UT on 6 Dec. 2014 - Note: JPL reports an approach uncertainty of +/- 2 minutes
Inside ten LD of Earth3 to 10 Dec. 2014
Data based onJPL SSD orbit solution #2 downloaded from JPL on 16 Dec. 2014 UTC
based on 15 observations spanning 3 days
Optical observation  
  • reported from 4 observing codes during 2.7820 days: 291, 568, F51, K93
  • designation assigned to Pan-STARRS 1 observation at 1137 UT 12 Dec. 2014
  • last observed at 0623 UT on 15 Dec. 2014 by the Spacewatch 1.8m telescope
Links  
2014 XB6   -     departed
Approximate diameter17 meters (H=26.464)
Closest Earth approach7.55 LD at 0716 UT on 14 Dec. 2014
Inside ten LD of Earth10 to 18 Dec. 2014
Data based onJPL SSD orbit solution #3 downloaded from JPL on 12 Dec. 2014 UTC
based on 27 observations spanning one day
Optical observation  
  • reported from 4 observing codes during 1.3507 days: 703, 958, G96, V37
  • designation assigned to Catalina Sky Survey observation at 0302 UT 10 Dec. 2014
  • last observed at 1127 UT on 11 Dec. 2014 by LCOGT Fort Davis
Links  
2014 WD366   -     departed
Approximate diameter11 meters (H=27.457)
Closest Earth approach8.27 LD at 0036 UT on 1 Dec. 2014
Inside ten LD of Earth27 Nov. until 4 Dec. 2014
Data based onJPL SSD orbit solution #1 downloaded from JPL on 2 Dec. 2014 UTC
based on 32 observations spanning one day
Optical observation  
  • reported from 4 observing codes during 1.5490 days: 300, 958, G96, H21
  • designation assigned to Mt. Lemmon Survey observation at 1001 UT 29 Nov. 2014
  • last observed at 2311 UT on 30 Nov. 2014 by Dax Obs.
Links  
2014 WB366   -     departed
Approximate diameter38 meters (H=24.748)
Closest Earth approach8.03 LD at 0652 UT on 5 Dec. 2014
Inside ten LD of Earth30 Nov. until 9 Dec. 2014
Data based onJPL SSD orbit solution #5 downloaded from JPL on 15 Dec. 2014 UTC
based on 55 observations spanning 13 days
Optical observation  
  • reported from 10 observing codes during 12.9631 days: 160, 300, 703, A48, G96, H01, I52, I89, I93, J95
  • first observed at 0315 UT on 29 Nov. 2014 by the Catalina Sky Survey
  • designation assigned to Mt. Lemmon Survey observation at 0322 UT 29 Nov. 2014
  • last observed at 0222 UT on 12 Dec. 2014 by Castelmartini Obs.
Links  
2014 WO365   -     departed
Approximate diameter21 meters (H=26.082)
Closest Earth approach3.20 LD at 0138 UT on 1 Dec. 2014
Inside ten LD of Earth27 Nov. until 4 Dec. 2014
Data based onJPL SSD orbit solution #1 downloaded from JPL on 1 Dec. 2014 UTC
based on 21 observations spanning 2 days
Optical observation  
  • reported from 4 observing codes during 1.9837 days: G96, H01, I52, J95
  • designation assigned to Mt. Lemmon Survey observation at 0440 UT 28 Nov. 2014
  • last observed at 0416 UT on 30 Nov. 2014 by Magdalena Ridge Obs.
Links  
2014 WY362   -     departed
Approximate diameter25 meters (H=25.647)
Closest Earth approach8.43 LD at 1512 UT on 6 Nov. 2014 - Note: JPL reports an approach uncertainty of +/- 37 minutes
Inside ten LD of Earth4 to 9 Nov. 2014
Data based onJPL SSD orbit solution #1 downloaded from JPL on 28 Nov. 2014 UTC
based on 10 observations spanning 5 days
Optical observation  
  • reported from 2 observing codes during 4.9025 days: 291, F51
  • designation assigned to Pan-STARRS 1 observation at 1135 UT 22 Nov. 2014
  • last observed at 0915 UT on 27 Nov. 2014 by Pan-STARRS 1
Links  
2014 WR362   -     departed
Approximate diameter12 meters (H=27.29)
Closest Earth approach1.39 LD at 1711 UT on 22 Nov. 2014
Inside Earth SOI22 to 23 Nov. 2014
Inside ten LD of Earth19 to 26 Nov. 2014
Closest Moon approach1.93 LD at 1137 UT on 22 Nov. 2014
Data based onJPL SSD orbit solution #1 downloaded from JPL on 27 Nov. 2014 UTC
based on 24 observations spanning 3 days
Optical observation  
  • reported from 5 observing codes during 2.9688 days: 291, 474, 703, G96, H36
  • designation assigned to Catalina Sky Survey observation at 0706 UT 24 Nov. 2014
  • last observed at 0621 UT on 27 Nov. 2014 by the Spacewatch 1.8m telescope
Links  
2014 WX202   -   outbound intruder
Approximate diameter4 meters (H=29.629)
Closest Earth approach0.98 LD at 2008 UT on 7 Dec. 2014
Inside Earth-Moon system0249 on 7 Dec. until 1324 UT on 8 Dec. 2014
Inside Earth SOI29 Nov. until 15 Dec. 2014
Inside ten LD of Earth30 Oct. until 18 Jan. 2015
Closest Moon approach0.58 LD at 0541 UT on 4 Dec. 2014
Inside one LD of Moon1653 on 2 Dec. until 2107 UT on 5 Dec. 2014
Data based onJPL SSD orbit solution #7 downloaded from JPL on 8 Dec. 2014 UTC
based on 43 observations spanning 14 days including radar
Optical observation  
  • reported from 7 observing codes during 13.7135 days: 291, G58, G96, H01, H21, H36, J95
  • designation assigned to Mt. Lemmon Survey observation at 0925 UT 24 Nov. 2014
  • last observed at 0232 UT on 8 Dec. 2014 by Magdalena Ridge Obs.
Radar observation  
  • observed once from one location
  • observed at 0443 UT on 27 Nov. 2014 by Arecibo
Notesradar target
Links  
2014 WU200   -   outbound
Approximate diameter6 meters (H=28.91)
Closest Earth approach1.17 LD at 1630 UT on 10 Dec. 2014
Inside Earth SOI5 to 15 Dec. 2014
Inside ten LD of Earth17 Nov. until 2 Jan. 2015
Closest Moon approach1.47 LD at 1420 UT on 7 Dec. 2014
Data based onJPL SSD orbit solution #8 downloaded from JPL on 10 Dec. 2014 UTC
based on 44 observations spanning 18 days
Optical observation  
  • reported from 8 observing codes during 17.9371 days: 204, 291, 568, G96, H36, J69, J95, K51
  • designation assigned to Mt. Lemmon Survey observation at 0656 UT 22 Nov. 2014
  • last observed at 0525 UT on 10 Dec. 2014 by Schiaparelli Obs.
Notesrisk
Links  
2014 UV210   -   outbound
Approximate diameter13 meters (H=27.011)
Closest Earth approach7.20 LD at 1748 UT on 13 Dec. 2014 - Note: JPL reports an approach uncertainty of +/- 2 minutes
Inside ten LD of Earth24 Nov. until 31 Dec. 2014
Data based onJPL SSD orbit solution #5 downloaded from JPL on 18 Dec. 2014 UTC
based on 25 observations spanning 53 days
Optical observation  
  • reported from 5 observing codes during 53.5245 days: 703, F51, H15, K32, K33
  • designation assigned to Pan-STARRS 1 observation at 0958 UT 25 Oct. 2014
  • last observed at 2234 UT on 17 Dec. 2014 by Maritime Alps Obs.
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.