Contents  on 19 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 19 December '13

One object reported inside ten LD

One object is reported passing within ten lunar distances (LD) of our planet today. 2013 XH22 exits Earth's Hill sphere, moving from 2.91 to 6.80 LD.

Next known to be on approach is returning 2011 YD29, calculated to arrive inside ten LD on December 23rd but with an uncertainty of 17-plus hours.

This report was generated at 1657 UTC with follow-up in today's DOU MPEC for 2013 XH22 and departed 2013 XH17, and we also note radar observation of 2013 XH22 reported yesterday.

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.

NEOCP Activity  on 19 December '13

The MPC's NEO Confirmation Page has 14 listings

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

To learn how observers use the NEOCP, see the Practical guide on how to observe NEOCP object at Suno Observatory by Birtwhistle et al.

New MPECs  on 19 December '13

Minor Planet Electronic Circulars

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

MPEC 2013-Y11 - "16:38 UT" - 2012 RX16

<< DOU on 19 Dec. '13 >>  MPEC 2013-Y10 - "14:02 UT" - Daily Orbit Update

Observers  on 19 December '13

A total of 20 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 6 in MPEC 2013-Y10 -- 2013 XW3, 2013 XV8, 2013 WT45, 55532, 381906, 16834
L22Barlad Obs., 3 in MPEC 2013-Y10 -- 2010 XZ67, 163696, 1627
C77Bernezzo Obs. in Italy, 2 in MPEC 2013-Y10 -- 2013 XH22, 21088
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2013-Y10 -- 2013 XG17
C41MASTER-II Obs. Kislovodsk in Russia, 2 in MPEC 2013-Y10 -- 53435, 1036
C94MASTER-II Obs. Tunka in Russia, 1 in MPEC 2013-Y10 -- 162566
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2013-Y10 -- 2013 XY20
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-Y10 -- 2009 FN28
568;Lucian Hudin on Mauna Kea in Hawaii, 1 in MPEC 2013-Y11 -- 2012 RX16
C91Montevenere Obs., 2 in MPEC 2013-Y10 -- 251346, 162566
A13Naef Obs. in Switzerland, 1 in MPEC 2013-Y10 -- 162566
A24New Millennium Obs. in Italy, 10 in MPEC 2013-Y10 -- 2013 UR3, 2010 XZ67, 53435, 52760, 361071, 251346, 21088, 162566, 138095, 137062
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2013-Y10 -- 2013 XZ9
A53Peschiera del Garda Obs. in Italy, 2 in MPEC 2013-Y10 -- 2011 CQ4, 163696
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 2 in MPEC 2013-Y10 -- 2013 XA4, 381906
071Rhozen Obs. in Bulgaria, 2 in MPEC 2013-Y10 -- 2013 TV135, 163249
C95SATINO-1 in France, 1 in MPEC 2013-Y10 -- 2013 XH22
H36Sandlot Obs. in Kansas, 1 in MPEC 2013-Y10 -- 2013 XH22
A84TUBITAK Natl. Obs. in Turkey, 1 in MPEC 2013-Y10 -- 1627
926Tenagra II Obs. in Arizona, 4 in MPEC 2013-Y10 -- 2013 XH17, 2013 XG10, 2013 XF22, 2013 WT67
I15Wishing Star Obs. in Rhode Island, 2 in MPEC 2013-Y10 -- 2013 XX8, 377097
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 19 December '13

At last check (NEODyS and JPL at 2358 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 19 December '13

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

1657Generated Traffic Report
1655Grabbed MPEC 2013-Y10 - Daily Orbit Update - see above
Grabbed MPEC 2013-Y11 - 2012 RX16 - see above