Contents  on 16 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 16 January '13

One object reported inside ten LD

There is one visitor reported to be inside a radius of ten lunar distances (LD) from our planet today. 2013 AP72 is within Earth's Hill sphere and comes its closest to us on this passage, reaching 1.92 LD at 1335 UT, and its closest to the Moon -- 2.78 LD at 0948 UT. Coming our way next, 2013 AT72 arrives inside ten LD on January 19th and intruder 2012 DA14 (risk-listed radar target) arrives on February 8th.

This report was generated at 1743 UTC with follow-up in today's DOU MPEC for 2013 AT72, 2013 AP72, and departed objects 2013 AG69, 2013 AB65, and 2013 AH53 (the first follow-up for all except AP72).

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 16 January '13

The MPC's NEO Confirmation Page has 140 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 140 objects listed. Of these, 130 were "one nighters." So far The Tracking News has counted a total of 159 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 16 January '13

Minor Planet Electronic Circulars

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

MPEC 2013-B06 - "18:39 UT" - 2013 AT76

MPEC 2013-B05 - "15:51 UT" - 2011 BB45

MPEC 2013-B04 - "15:49 UT" - 2011 BA45

MPEC 2013-B03 - "15:45 UT" - 2003 BB21

MPEC 2013-B02 - "14:56 UT" - 2013 AS76

<< DOU on 16 Jan. '13 >>  MPEC 2013-B01 - "06:03 UT" - Daily Orbit Update

Observers  on 16 January '13

Seventeen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 20 in MPECs 2013-B01, 2013-B04 & 2013-B05 -- 2013 AX60, 2013 AV60, 2013 AS27, 2013 AO60, 2013 AO27, 2013 AL11, 2013 AB65, 2013 AB32, 2012 YO3, 2012 YN6, 2012 YL7, 2012 XY6, 2012 XR134, 2012 XQ111, 2012 XG55, 2012 VJ6, 2012 PQ28, 2011 BB45, 2011 BA45, 2010 AB78
I74Baxter Garden Obs. in England, 1 in MPEC 2013-B01 -- 262623
703Catalina Sky Survey (CSS) in Arizona, 10 in MPECs 2013-B01 & 2013-B06 -- 2013 AT76, 2013 AR27, 2012 XF17, 2012 FS62, 349068, 276397, 154347, 153249, 153243, 1916
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 14 in MPECs 2013-B01, 2013-B04 & 2013-B05 -- 2013 AV60, 2013 AT72, 2013 AS72, 2013 AN60, 2013 AM60, 2012 XZ6, 2012 XD133, 2012 XC55, 2011 BB45, 2011 BA45, 2009 DK46, 2008 CJ70, 2004 BE85, 1999 JU6
970Chelmsford Obs. in England, 1 in MPEC 2013-B06 -- 2013 AT76
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 10 in MPECs 2013-B01, 2013-B02, 2013-B03 & 2013-B06 -- 2013 AT76, 2013 AS76, 2013 AL20, 2013 AK20, 2013 AJ11, 2013 AH53, 2013 AG69, 2013 AB65, 2003 BB21, 1916
F65$Ernesto Guido in Italy via Faulkes Telescope North in Hawaii, 1 in MPEC 2013-B06 -- 2013 AT76
J95Great Shefford Obs. in England, 3 in MPECs 2013-B01, 2013-B02 & 2013-B06 -- 2013 AT76, 2013 AS76, 2013 AP72
W85LCOGT Cerro Tololo A in Chile, 2 in MPEC 2013-B01 -- 285263, 163364
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2013-B02 -- 2013 AS76
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-B01 -- 2013 AJ11
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPEC 2013-B01 -- 2012 WB25, 65674, 262623
C39Nijmegen Obs., 3 in MPEC 2013-B01 -- 68548, 229672, 138937
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2013-B01 -- 2013 AP72
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2013-B06 -- 2013 AT76
H36Sandlot Obs. in Kansas, 3 in MPECs 2013-B01, 2013-B02 & 2013-B06 -- 2013 AT76, 2013 AS76, 2013 AS27
926Tenagra II Obs. in Arizona, 1 in MPEC 2013-B01 -- 198752
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 January '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
2013 AB65JPL Sentry17372087-2113124.8e-06-6.50-6.660JPL: "Analysis based on 26 observations spanning 2.9790 days (2013-Jan-12.28046 to 2013-Jan-15.259462)." Diameter approximately 0.010 km. from mean, weighted H=27.6.
NEODyS17372094-209411.91e-07-7.82-7.820NEODyS: "Based on 29 optical observations (of which 3 are rejected as outliers) from 2013-01-12.281 to 2013-01-15.260."
2010 XW58NEODyS1737R 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 16 January '13

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

1844Grabbed MPEC 2013-B06 - 2013 AT76 - see above
1743Generated Traffic Report
1737Noted that NEODyS has removed 2010 XW58 as an impact risk - see above
Noted that JPL Sentry has updated its 2013 AB65 risk assessment - see above
Noted that NEODyS has updated its 2013 AB65 risk assessment - see above
Grabbed MPEC 2013-B01 - Daily Orbit Update - see above
Grabbed MPEC 2013-B02 - 2013 AS76 - see above
Grabbed MPEC 2013-B03 - 2003 BB21 - see above
Grabbed MPEC 2013-B04 - 2011 BA45 - see above
Grabbed MPEC 2013-B05 - 2011 BB45 - see above