Contents  on 22 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 22 December '13

No objects reported inside ten LD

There are no objects reported to be within a radius of ten lunar distances (LD) from Earth today. Next up is returning 2011 YD29, which is calculated to arrive inside ten LD on December 23rd, but with an uncertainty of more than 17 hours.

This report was generated at 1628 UTC with follow-up in today's DOU MPEC for departed radar target 2013 XY8, and updated at 1812 UTC to note the July-August recovery of distant risk-listed intruder 2010 RX30 (MPEC).

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 22 December '13

The MPC's NEO Confirmation Page has 3 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three objects listed. Of these, two were "one nighters." So far The Tracking News has counted a total of four 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 22 December '13

Minor Planet Electronic Circulars

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

MPEC 2013-Y19 - "17:08 UT" - 2013 XM24

<< DOU on 22 Dec. '13 >>  MPEC 2013-Y18 - "14:02 UT" - Daily Orbit Update

MPEC 2013-Y17 - "04:43 UT" - 2010 RX30

Observers  on 22 December '13

Twelve observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2013-Y19 -- 2013 XM24
160Castelmartini Obs. in Italy, 17 in MPEC 2013-Y18 -- 2013 VD13, 2013 UR3, 2012 ER14, 2010 XZ67, 2009 XZ1, 381906, 377097, 369264, 340666, 294739, 279744, 262623, 251346, 249595, 215188, 153201, 138095
703Catalina Sky Survey in Arizona, 1 in MPEC 2013-Y18 -- 2013 NX23
958Dax Obs. in France, 1 in MPEC 2013-Y19 -- 2013 XM24
J95Great Shefford Obs. in England, 1 in MPEC 2013-Y19 -- 2013 XM24
844Los Molinos Obs. in Uruguay, 2 in MPEC 2013-Y18 -- 2013 XA4, 2102
A06Mataro Obs. in Spain, 1 in MPEC 2013-Y18 -- 163696
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPECs 2013-Y17 & 2013-Y18 -- 2013 XY20, 2010 RX30
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2013-Y19 -- 2013 XM24
A24New Millennium Obs. in Italy, 4 in MPEC 2013-Y18 -- 89830, 53435, 361071, 137062
G404Don Cranford, Jr. in North Carolina via Canary Islands Obs. in the Canary Islands, 1 in MPEC 2013-Y18 -- 2013 VD13
926Tenagra II Obs. in Arizona, 2 in MPECs 2013-Y18 & 2013-Y19 -- 2013 XY8, 2013 XM24
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 December '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2359 UTC)
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
2010 RX30JPL Sentry1627R E M O V E DJPL: Risk listing removed at 0727 UTC.
2008 CK70NEODyS1627R E M O V E D-

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 22 December '13

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

1715Grabbed MPEC 2013-Y19 - 2013 XM24 - see above
1628Generated Traffic Report
1627Noted that NEODyS has removed 2008 CK70 as an impact risk - see above
Noted that JPL Sentry has removed 2010 RX30 as an impact risk - see above
Grabbed MPEC 2013-Y18 - Daily Orbit Update - see above
0500Grabbed MPEC 2013-Y17 - 2010 RX30 - see above