Contents  on 29 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 29 December '13

One object reported inside ten LD

One object is reported to be possibly flying within ten lunar distances (LD) of Earth today. Unrecovered 2011 YD29 is calculated with major uncertainty to be outbound from 6.1 to 6.4 LD. Coming into the neighborhood next, 2013 YL2 arrives inside ten LD on January 1st.

This report was generated at 1610 UTC with follow-up in today's DOU MPEC for 2013 YL2 and departed 2013 YD.

Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. 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 29 December '13

The MPC's NEO Confirmation Page has 22 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 22 objects listed. Of these, nine were "one nighters."

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 29 December '13

Minor Planet Electronic Circulars

As of last check at 2359 UTC, there have been two MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2013-Y56 - "15:14 UT" - 2013 EO126

<< DOU on 29 Dec. '13 >>  MPEC 2013-Y55 - "14:03 UT" - Daily Orbit Update

Observers  on 29 December '13

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
703Catalina Sky Survey (CSS) in Arizona, 2 in MPEC 2013-Y55 -- 2013 YB14, 2013 XM24
448Desert Moon Obs. in New Mexico, 3 in MPEC 2013-Y55 -- 2009 WE253, 2006 YF13, 381906
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2013-Y55 -- 2013 YC14
C43Hoyerswerda Obs. in Germany, 1 in MPEC 2013-Y55 -- 2013 YZ13
I36Los Campitos Obs. in Argentina, 2 in MPEC 2013-Y55 -- 2013 YL2, 2013 YD
C41MASTER-II Obs. Kislovodsk in Russia, 1 in MPEC 2013-Y55 -- 2012 ER14
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPECs 2013-Y55 & 2013-Y56 -- 2013 EO126, 2012 UE34
J93Mt. Tuffley Obs. in England, 2 in MPEC 2013-Y55 -- 162566, 2062
J43Oukaimeden Obs. in Morocco, 3 in MPEC 2013-Y55 -- 2009 XZ1, 153201, 144411
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 5 in MPEC 2013-Y55 -- 2013 XX8, 2013 XH4, 2013 XA4, 2010 XZ67, 2009 XZ1
D29Purple Mtn. Obs. Xuyi Station in China, 5 in MPEC 2013-Y55 -- 53435, 377097, 249595, 138205, 10165
L04ROASTERR-1 Obs., 1 in MPEC 2013-Y55 -- 21088
033Schwarzschild Obs. in Germany, 2 in MPEC 2013-Y55 -- 2013 YZ13, 2013 YB14
J84South Obs. in England, 1 in MPEC 2013-Y55 -- 2013 YD
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2013-Y55 -- 376778
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2013-Y55 -- 2013 XZ20, 2013 XN24, 2007 RN7, 277616
926Tenagra II Obs. in Arizona, 1 in MPEC 2013-Y55 -- 2013 YD
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 December '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: JPL at 2359 UTC, NEODyS unavailable)
See the CRT page for a list of all objects rated recently as risks and our ephemerides page for a list of risk-listed objects under current observation.
The time horizon for JPL is 100 years from today and for NEODyS is usually the year 2090. Both also post impact solutions beyond 100 years for a few special objects.
For the latest official risk assessments, and for explanations of the terminology, see the JPL NEO Program Sentry and NEODyS CLOMON2 risk pages.





Notes for Today's Latest Risk Assessments
2012 UE34NEODyS1702R E M O V E D-
JPL Sentry1702R E M O V E DJPL: Risk listing removed at 1649 UTC.

Legend: VI# = VI count, Prob Cum = cumulative probability, PS Cum/Max = cumulative/maximum Palermo Scale, TS = Torino Scale

An impact solution, also known as a "virtual impactor" (VI), is not a prediction but rather a possibility derived from a variant orbit calculation that cannot be eliminated yet based on the existing data. Elimination can come quickly with just a little further observation or may take weeks or months, sometimes years. Once superceded or eliminated, a former impact solution has zero relevance to an object's risk. See Jon Giorgini's "Understanding Risk Pages" to learn more.

Chronology  on 29 December '13

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

1702Noted that JPL Sentry has removed 2012 UE34 as an impact risk - see above
Noted that NEODyS has removed 2012 UE34 as an impact risk - see above
1610Grabbed MPEC 2013-Y55 - Daily Orbit Update - see above
Grabbed MPEC 2013-Y56 - 2013 EO126 - see above
Generated Traffic Report