Contents  on 15 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 15 January '13

Two objects reported inside ten LD

There are two asteroids reported passing within ten lunar distances (LD) of our planet today. Inside Earth's Hill sphere, 2013 AP72 is inbound from 3.61 to 2.21 LD and, further out, 2013 AB4 exits ten LD, traveling from 8.86 to 10.32 LD.

On approach 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 1643 UTC with the recovery of distant risk-listed 2010 XW58 (MPEC) and follow-up in today's DOU MPEC for 2013 AP72 and departed objects 2013 AF53 and 2013 AC53.

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 15 January '13

The MPC's NEO Confirmation Page has 25 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 25 objects listed. Of these, thirteen were "one nighters." So far The Tracking News has counted a total of 35 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 15 January '13

Minor Planet Electronic Circulars

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

MPEC 2013-A97 - "18:35 UT" - 2013 AH76

MPEC 2013-A96 - "18:32 UT" - 2013 AG76

MPEC 2013-A95 - "15:59 UT" - 2010 XW58

<< DOU on 15 Jan. '13 >>  MPEC 2013-A94 - "06:03 UT" - Daily Orbit Update

Observers  on 15 January '13

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

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2013-A96 -- 2013 AG76
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2013-A94 & 2013-A96 -- 2013 AN20, 2013 AG76, 2012 XH55
300Bisei Spaceguard Center in Japan, 1 in MPEC 2013-A96 -- 2013 AG76
160Castelmartini Obs. in Italy, 5 in MPEC 2013-A94 -- 2012 XD112, 345722, 249886, 229672, 137805
703Catalina Sky Survey (CSS) in Arizona, 12 in MPECs 2013-A94, 2013-A96 & 2013-A97 -- 2013 AH76, 2013 AG76, 2013 AC53, 2012 XH55, 2012 VA5, 2010 XL69, 2005 TE15, 175706, 163364, 138175, 12538, 4660
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPECs 2013-A94 & 2013-A96 -- 2013 AG76, 2012 QQ50, 2012 QE50, 2010 VA1, 2006 VA3, 2004 TU11, 276409
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 5 in MPECs 2013-A94, 2013-A96 & 2013-A97 -- 2013 AH76, 2013 AG76, 2013 AF69, 2013 AA53, 2012 XH55
I48El Catalejo Obs. in Argentina, 1 in MPEC 2013-A96 -- 2013 AG76
J95Great Shefford Obs. in England, 2 in MPECs 2013-A94 & 2013-A97 -- 2013 AP72, 2013 AH76
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-A95 -- 2010 XW58
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2013-A96 -- 2013 AG76
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2013-A96 -- 2013 AG76
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2013-A96 -- 2013 AG76
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2013-A96 -- 2013 AG76
H36Sandlot Obs. in Kansas, 3 in MPECs 2013-A94, 2013-A96 & 2013-A97 -- 2013 AH76, 2013 AG76, 2012 XH55
204Schiaparelli Obs. in Italy, 13 in MPEC 2013-A94 -- 2013 AO20, 2013 AH11, 2013 AF53, 2013 AF4, 2013 AB53, 2012 YL7, 2012 YK7, 2012 YF8, 2012 XQ93, 2012 XP111, 2012 XE112, 2009 BD2, 99942 Canary Islands Obs. in the Canary Islands, 1 in MPEC 2013-A96 -- 2013 AG76
K21St. Saturnin les Avignon Obs., 2 in MPEC 2013-A94 -- 99942, 4179
926Tenagra II Obs. in Arizona, 4 in MPEC 2013-A94 -- 68548, 329614, 4179, 1036
Q622program code 2 via iTelescope Obs. Siding Spring in New South Wales, 1 in MPEC 2013-A96 -- 2013 AG76
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 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
2010 XW58JPL Sentry1816R E M O V E DJPL: Risk listing removed at 1753 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 15 January '13

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

1841Grabbed MPEC 2013-A96 - 2013 AG76 - see above
Grabbed MPEC 2013-A97 - 2013 AH76 - see above
1816Noted that JPL Sentry has removed 2010 XW58 as an impact risk - see above
1643Generated Traffic Report
1640Grabbed MPEC 2013-A94 - Daily Orbit Update - see above
Grabbed MPEC 2013-A95 - 2010 XW58 - see above