Contents  on 22 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 22 February '13

Five objects reported inside ten LD

Five asteroids are reported to be within ten lunar distances (LD) of Earth today. 2013 DS9 is inbound from 9.81 to 9.17 LD while the other four are oubound, including two which leave the ten-LD "bubble" today. 2013 CZ87 moves from 8.26 to 9.18 LD, radar target 2013 BS45 from 8.36 to 8.94 LD, radar target intruder 2012 DA14 from 8.64 to 10.01 LD, and 2013 DB from 9.48 to 10.66 LD.

Next known to be coming into the bubble is risk-listed 2007 EO88, which arrives on March 15th.

This report was generated at 1518 UTC with follow-up in today's DOU MPEC for departed 2013 DC1 and distant 136617 1994 CC as well as observation of 2012 XK134 from mid-January, adding 22.18 days to its previous 8.13-day observing arc.

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 February '13

The MPC's NEO Confirmation Page has 2 listings

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

Minor Planet Electronic Circulars

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

<< DOU on 22 Feb. '13 >>  MPEC 2013-D47 - "06:05 UT" - Daily Orbit Update

Observers  on 22 February '13

Seven observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 18 in MPEC 2013-D47 -- 2013 DU, 2013 DT, 2013 DR9, 2013 DC1, 2013 DA, 2013 CZ133, 2013 CX129, 2013 CW83, 2013 CU129, 2013 CT36, 2013 CR35, 2013 CQ35, 2013 CN129, 2013 BY45, 2010 DE, 2006 FJ9, 19764, 3752
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 17 in MPEC 2013-D47 -- 2013 DZ, 2013 DM1, 2013 CX129, 2013 CK129, 2013 AQ27, 2012 PP28, 2011 CS4, 2007 EF, 2006 KY86, 2005 LY19, 2003 EO16, 2003 BB21, 2002 JW15, 2001 YF1, 37336, 243147, 162168
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2013-D47 -- 2013 CN129
168Kourovskaya Obs. in Russia, 1 in MPEC 2013-D47 -- 99942
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2013-D47 -- 2012 XK134, 2012 UE34
711McDonald Obs. in Texas, 6 in MPEC 2013-D47 -- 2013 BU2, 2013 AP27, 2013 AO60, 2013 AO27, 2013 AA53, 2012 XY6
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPEC 2013-D47 -- 2013 AW60, 2011 SD173, 2006 DY, 25916, 136617, 8507, 3671
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 February '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 CU129JPL Sentry1515R E M O V E DJPL: Risk listing removed at 1050 UTC.
2013 CK129JPL Sentry1515R E M O V E DJPL: Risk listing removed at 1050 UTC.
2012 XK134NEODyS1515R E M O V E D-
2012 UE34JPL Sentry15152095-210574.5e-07-5.88-6.370JPL: "Analysis based on 45 observations spanning 85.993 days (2012-Oct-18.393533 to 2013-Jan-12.386296)." Diameter approximately 0.081 km. from mean, weighted H=23.1.
NEODyS15152091-209943.99e-07-5.92-5.960NEODyS: "Based on 45 optical observations (of which 0 are rejected as outliers) from 2012-10-18.394 to 2013-01-12.387."
99942 Apophis (2004 MN4)NEODyS15152036-2105203.48e-0610.1410.140NEODyS: "Based on 444 optical observations (of which 0 are rejected as outliers) from 2004-03-15.108 to 2012-12-29.580 and also on seven radar data points on 2005-01-27, 2005-01-29, 2005-01-31, 2005-08-07 and 2006-05-06."

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 February '13

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

1518Generated Traffic Report
1515Noted that NEODyS has updated its 99942 Apophis (2004 MN4) risk assessment - see above
Noted that JPL Sentry has updated its 2012 UE34 risk assessment - see above
Noted that NEODyS has updated its 2012 UE34 risk assessment - see above
Noted that NEODyS has removed 2012 XK134 as an impact risk - see above
Noted that JPL Sentry has removed 2013 CK129 as an impact risk - see above
Noted that JPL Sentry has removed 2013 CU129 as an impact risk - see above
Grabbed MPEC 2013-D47 - Daily Orbit Update - see above