Contents  on 21 February '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 21 February '13

Six objects reported inside ten LD

Six visitors are reported within ten lunar distances (LD) of Earth today, five of them outbound. Radar target intruder 2012 DA14 moves from 7.26 to 8.64 LD, 2013 CZ87 from 7.56 to 8.26 LD, radar target 2013 BS45 from 7.81 to 8.36 LD, 2013 DB from 8.36 to 9.48 LD, and, leaving ten LD, 2013 CW129 from 8.77 to 12.48 LD, while newly announced 2013 DS9 comes inside ten LD, traveling from 10.65 to 9.81 LD.

Next known to be approaching this close is risk-listed 2007 EO88, which arrives inside ten LD on March 15th.

This report was generated at 1633 UTC with new discovery 2013 DS9 (MPEC) and follow-up in today's DOU MPEC for 2012 DA14 and departed radar target 2013 BV15.

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 21 February '13

The MPC's NEO Confirmation Page has 8 listings

When last checked at 2321 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eight objects listed. All of these were "one nighters." So far The Tracking News has counted a total of eighteen 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 21 February '13

Minor Planet Electronic Circulars

As of last check at 2321 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2013-D46 - "11:21 UT" - 2013 DS9

MPEC 2013-D45 - "11:16 UT" - 2013 DR9

MPEC 2013-D44 - "11:11 UT" - 2013 DQ9

<< DOU on 21 Feb. '13 >>  MPEC 2013-D43 - "06:04 UT" - Daily Orbit Update

Observers  on 21 February '13

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 15 in MPECs 2013-D43, 2013-D44, 2013-D45 & 2013-D46 -- 2013 DZ, 2013 DS9, 2013 DR9, 2013 DQ9, 2013 CW83, 2013 CR35, 2013 CP35, 2013 CK89, 2013 AW52, 2013 AM20, 2008 RE80, 276732, 212359, 164201, 152561
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 5 in MPEC 2013-D43 -- 2012 XC55, 2009 BE77, 2008 RE80, 2005 XV77, 307918
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2013-D44 -- 2013 DQ9
J95Great Shefford Obs. in England, 2 in MPECs 2013-D45 & 2013-D46 -- 2013 DS9, 2013 DR9
D00ISON-Kislovodsk Obs., 3 in MPEC 2013-D43 -- 2012 CD29, 1999 CT8, 5828
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2013-D44 -- 2013 DQ9
C41MASTER-II Obs. Kislovodsk in Russia, 1 in MPEC 2013-D43 -- 1864
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-D43 -- 2013 AN60
C91Montevenere Obs., 2 in MPEC 2013-D43 -- 85990, 343098
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2013-D44, 2013-D45 & 2013-D46 -- 2013 DS9, 2013 DR9, 2013 DQ9
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2013-D43 -- 2012 UZ33
A24New Millennium Obs. in Italy, 3 in MPECs 2013-D43 & 2013-D46 -- 2013 DS9, 5828, 4179
586Pic du Midi Obs. in France, 1 in MPEC 2013-D43 -- 99942
H36Sandlot Obs. in Kansas, 1 in MPEC 2013-D45 -- 2013 DR9
204Schiaparelli Obs. in Italy, 16 in MPECs 2013-D43 & 2013-D46 -- 2013 DS9, 2013 DF, 2013 CW83, 2013 CW35, 2013 BV15, 2013 BD70, 2013 BC74, 2012 LK9, 2011 DL19, 2010 XL69, 2009 BE77, 2008 RE80, 2007 NS4, 2003 BN4, 2002 DU3, 2002 BP26
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2013-D45 -- 2013 DR9
Z86St. Mellons Obs., 1 in MPEC 2013-D43 -- 1864
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2013-D45 & 2013-D46 -- 2013 DS9, 2013 DR9
H068program code 8 via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2013-D43 -- 2012 DA14
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 February '13

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2321 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 Sentry23212036-2105193.5e-06-3.41-3.560JPL: "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 0.330 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 21 February '13

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

2321Noted that JPL Sentry has updated its 99942 Apophis (2004 MN4) risk assessment - see above
1705Noted that the NEOCP has become active
1633Generated Traffic Report
1535Grabbed MPEC 2013-D43 - Daily Orbit Update - see above
Grabbed MPEC 2013-D44 - 2013 DQ9 - see above
Grabbed MPEC 2013-D45 - 2013 DR9 - see above
Grabbed MPEC 2013-D46 - 2013 DS9 - see above
Noted that the NEOCP has become empty