Contents  on 13 December '13

Asteroid/Comet Connection (A/CC) Resources:

The latest A/CC news is available via framed access, RSS news feed RSS news feed, or redirection. - Note: A/CC has a main Web site and also a backup site with its own duplicate RSS news feed.

Navigation tips: Use the << and >> arrows on the menus for each regular section (Observers, Risks, etc.) to move to the previous and next day's news for that section. Use the Index menu item to access specific days through a calendar interface. And use the all-up news archive to access news from any time since A/CC began in early 2002. To keep track of what's new each day, watch the Chronology section.

Traffic Report  on 13 December '13

Two objects reported inside ten LD

There are two asteroids reported traveling within ten lunar distances (LD) of Earth today. Radar target 2013 XY8 exits Earth's Hill sphere, passing from 3.68 to 5.50 LD. And, further out, 2013 XH17 is outbound from 8.41 to 9.83 LD.

This report was generated at 1522 UTC with first follow-up in today's DOU MPEC for 2013 XH17 and follow-up for radar targets 2013 XY8 and departed 2013 NJ.



Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Earth's Hill sphere (of gravitational influence) is estimated to extend out to around 3.89 LD. Object distances are interpreted by A/CC from JPL Horizons data. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

Radar Astrometry  on 13 December '13

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 2038 UTC when the database was dated 13 Dec.

NEOCP Activity  on 13 December '13

The MPC's NEO Confirmation Page has 33 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 33 objects listed. Of these, eleven were "one nighters." So far The Tracking News has counted a total of 44 listings on the NEOCP today.

New MPECs  on 13 December '13

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been five MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2013-X65 - "21:59 UT" - 2013 XA21


MPEC 2013-X64 - "21:53 UT" - 2013 XZ20


MPEC 2013-X63 - "21:46 UT" - 2013 XY20


<< DOU on 13 Dec. '13 >>  MPEC 2013-X62 - "14:03 UT" - Daily Orbit Update


MPEC 2013-X61 - "12:56 UT" - 2008 FG

Observers  on 13 December '13

A total of 25 observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 1 in radar -- 2013 XY8
H21Astronomical Research Obs. Westfield in Illinois, 19 in MPECs 2013-X62, 2013-X63 & 2013-X64 -- 2013 XZ9, 2013 XZ20, 2013 XY8, 2013 XY20, 2013 XV8, 2013 XG17, 2013 WW44, 2013 WB44, 2013 UR3, 2013 TS4, 2013 SK19, 2013 QG17, 251346, 16834, 163696, 142781, 138852, 2212, 1627
703Catalina Sky Survey (CSS) in Arizona, 4 in MPECs 2013-X62 & 2013-X65 -- 2013 XA4, 2013 XA21, 334673, 10165
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 17 in MPEC 2013-X62 -- 2013 VV4, 2013 VF13, 2013 VC10, 2013 UH9, 2013 TE6, 2013 LW28, 2012 AU10, 2011 XE, 2011 SG5, 2010 OQ1, 2010 LJ14, 2007 BG, 2006 WJ3, 2005 YV128, 2004 XN14, 1998 WP7, 153201
958Dax Obs. in France, 3 in MPECs 2013-X63, 2013-X64 & 2013-X65 -- 2013 XZ20, 2013 XY20, 2013 XA21
G32Elena Remote Obs., 1 in MPEC 2013-X62 -- 12923
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2013-X65 -- 2013 XA21
C94MASTER-II Obs. Tunka in Russia, 1 in MPEC 2013-X62 -- 137062
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-X61 -- 2008 FG
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2013-X62 -- 2013 XV8, 2013 NJ
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2013-X62, 2013-X63 & 2013-X65 -- 2013 XY20, 2013 XA21, 2012 AS10, 2002 LV, 85275, 162038, 152742, 13651, 1916
A24New Millennium Obs. in Italy, 5 in MPEC 2013-X62 -- 89830, 53435, 361071, 137062, 1943
0892Oleksandr V. Shulga via Nikolaev Obs. in the Ukraine, 1 in MPEC 2013-X62 -- 2013 XA4
583Odessa-Mayaki Obs. in the Ukraine, 1 in MPEC 2013-X62 -- 2013 RH74
C23Olmen Obs. in Belgium, 1 in MPEC 2013-X62 -- 2010 XZ67
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPECs 2013-X62 & 2013-X64 -- 2013 XZ20, 2013 XV18, 2013 TE6, 2009 XC2, 363305, 152756
D29Purple Mtn. Obs. Xuyi Station in China, 5 in MPEC 2013-X62 -- 2013 XH4, 2013 TH5, 53435, 249595, 137099
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2013-X63 -- 2013 XY20
H36Sandlot Obs. in Kansas, 1 in MPEC 2013-X63 -- 2013 XY20
204Schiaparelli Obs. in Italy, 2 in MPECs 2013-X64 & 2013-X65 -- 2013 XZ20, 2013 XA21
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2013-X63 & 2013-X64 -- 2013 XZ20, 2013 XY20
A84TUBITAK Natl. Obs. (TUG) in Turkey, 2 in MPEC 2013-X62 -- 285263, 10115
926Tenagra II Obs. in Arizona, 5 in MPEC 2013-X62 -- 2013 XV8, 2013 XH4, 2013 XH17, 2013 XA4, 163249
718Wiggins Obs. in Utah, 1 in MPEC 2013-X62 -- 2013 XA4
I15Wishing Star Obs. in Rhode Island, 2 in MPEC 2013-X62 -- 2013 WS43, 2013 VY13
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 13 December '13

At last check (NEODyS and JPL at 2359 UTC) there was no risk monitoring news to report yet today. Visit the CRT to view activity in the last four weeks and our ephemerides page for a complete list of risk-rated objects under current observation or having recent news.

Chronology  on 13 December '13

Times are UTC for when items were noted or added by The Tracking News.

2237Grabbed MPEC 2013-X63 - 2013 XY20 - see above
Grabbed MPEC 2013-X64 - 2013 XZ20 - see above
Grabbed MPEC 2013-X65 - 2013 XA21 - see above
2038Noted Radar Astrometry database update - see above
1522Generated Traffic Report
1517Grabbed MPEC 2013-X61 - 2008 FG - see above
Grabbed MPEC 2013-X62 - Daily Orbit Update - see above