Contents  on 11 January '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 11 January '13

Three objects reported inside ten LD

There are three visitors reported to be inside ten lunar distances (LD) of our planet today. 2013 AB4, which has had no follow-up observation reported since its January 5th discovery announcement, is calculated to come its closest to Earth on this passage, reaching an uncertain 6.5 LD at around 2234 UT. 2013 AC53 is outbound from 7.30 to 8.66 LD and 2013 AF53 from 7.48 to 7.82 LD.

The next known object to come within the ten-LD "bubble" is intruder 2012 DA14, a small risk-listed radar target that arrives inside ten LD on February 8th.

This report was generated at 1710 UTC with follow-up in today's DOU MPEC for departed 2012 XJ134.

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 11 January '13

The MPC's NEO Confirmation Page has 34 listings

When last checked at 2310 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 34 objects listed. Of these, seventeen 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 11 January '13

Minor Planet Electronic Circulars

As of last check at 2310 UTC, there has been one MPEC posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

<< DOU on 11 Jan. '13 >>  MPEC 2013-A67 - "06:03 UT" - Daily Orbit Update

Observers  on 11 January '13

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

CodeObserver / observatory
I47Auger Obs. in Argentina, 2 in MPEC 2013-A67 -- 99942, 4179
I56Beckman Obs. in Spain, 1 in MPEC 2013-A67 -- 343098
300Bisei Spaceguard Center in Japan, 2 in MPEC 2013-A67 -- 2013 AY52, 2013 AX52
726Brainerd Obs. in Minnesota, 2 in MPEC 2013-A67 -- 262623, 203471
703Catalina Sky Survey (CSS) in Arizona, 8 in MPEC 2013-A67 -- 2009 XF2, 349068, 162900, 162011, 137925, 5836, 4486, 1862
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 15 in MPEC 2013-A67 -- 2013 AO20, 2013 AL11, 2013 AH11, 2013 AB53, 2012 SA22, 2011 YX10, 2009 YO, 2009 ST, 2005 XV77, 2000 BG19, 313809, 285263, 276786, 152889, 136635
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2013-A67 -- 2013 AU27
G27Fabra Obs., 1 in MPEC 2013-A67 -- 4179
157Frasso Sabino Obs. in Italy, 3 in MPEC 2013-A67 -- 2012 YO3, 2012 YN6, 2012 XY6
704LINEAR in New Mexico, 15 in MPEC 2013-A67 -- 2013 AX52, 2013 AO27, 2012 YF8, 2012 XF112, 2008 XE2, 2002 AY1, 52762, 330825, 203471, 144411, 137199, 6455, 5828, 5646, 2212
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPEC 2013-A67 -- 2013 AS27, 2010 XL69, 8507
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2013-A67 -- 2003 BN4
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2013-A67 -- 4486
F51Pan-STARRS 1 (PS1) in Hawaii, 6 in MPEC 2013-A67 -- 2012 VF80, 2009 OP9, 349068, 219071, 162011, 136793
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2013-A67 -- 2013 AW52
B74Santa Maria de Montmagastrell Obs. in Spain, 1 in MPEC 2013-A67 -- 99942
204Schiaparelli Obs. in Italy, 6 in MPEC 2013-A67 -- 2013 AN20, 2012 XM134, 2012 XC133, 2012 VN82, 2012 VG6, 2009 SQ104
E12Siding Spring Survey (SSS) in New South Wales, 5 in MPEC 2013-A67 -- 2012 QP17, 2009 BD2, 99942, 87024, 310560
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2013-A67 -- 2013 AP27, 2002 AW, 1998 QR15, 22753
291Spacewatch 1.8m telescope in Arizona, 15 in MPEC 2013-A67 -- 2013 AO27, 2013 AC, 2013 AB32, 2012 YY6, 2012 YP6, 2012 YN6, 2012 YK7, 2012 YD7, 2012 XT134, 2012 XS134, 2012 XJ134, 2012 XF112, 2012 CD29, 2010 WE9, 2007 ES
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 January '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2310 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
99942 Apophis (2004 MN4)JPL Sentry01042036-2105197.4e-06-3.20-3.330JPL: "Analysis based on 2 radar delay, 5 Doppler, and 444 optical observations spanning 3211.5 days (2004-Mar-15.10789 to 2012-Dec-29.58034)." Diameter approximately 0.270 km. from mean, weighted H=19.7.

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 11 January '13

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

1710Generated Traffic Report
1709Grabbed MPEC 2013-A67 - Daily Orbit Update - see above
0104Noted that JPL Sentry has updated its 99942 Apophis (2004 MN4) risk assessment - see above