Contents  on 31 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 31 January '13

One object reported inside ten LD

One object is reported to be inside ten lunar distances (LD) of our planet today. Radar target 2013 BS45 is inbound from 9.65 to 9.05 LD.

Next known to be coming our way are 2013 BV15 and intruder 2012 DA14 (risk-listed radar target), both arriving inside ten LD on February 8th.

This report was generated at 1736 UTC with follow-up in today's DOU MPEC for 2013 BV15 (observation arc extended from 4.99 to 13.73 days) and 2013 BS45, plus observation of intruder 2011 MD (links) from June 2011.

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 31 January '13

The MPC's NEO Confirmation Page has 20 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 20 objects listed. Of these, eighteen were "one nighters." So far The Tracking News has counted a total of 25 listings on the NEOCP today.

New MPECs  on 31 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-B99 - "15:10 UT" - 2013 BN73

MPEC 2013-B98 - "15:05 UT" - 2013 BP73

MPEC 2013-B97 - "15:00 UT" - 2013 BO73

<< DOU on 31 Jan. '13 >>  MPEC 2013-B96 - "06:02 UT" - Daily Orbit Update

Observers  on 31 January '13

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

CodeObserver / observatory
B17AZT-8 Evpatoria in the Ukraine, 1 in MPEC 2013-B96 -- 99942
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPEC 2013-B96 -- 2013 AJ91, 2005 DD, 277127, 136635, 11405, 3908, 2062
J51Atlante Obs. in the Canary Islands, 1 in MPEC 2013-B96 -- 2013 BE19
B88Bigmuskie Obs. in Italy, 1 in MPEC 2013-B96 -- 2012 PQ28
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPEC 2013-B96 -- 2013 BT18, 2013 BP18, 2013 AX52, 2013 AO20, 2012 SG32, 2012 QP10, 1999 LS7
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 2 in MPEC 2013-B96 -- 2013 BU15, 2013 BE19
E89Geyserland Obs. in New Zealand, 1 in MPEC 2013-B96 -- 2013 AU27
J95Great Shefford Obs. in England, 1 in MPEC 2013-B96 -- 2013 BE19
W85LCOGT Cerro Tololo A in Chile, 1 in MPEC 2013-B96 -- 3752
W87LCOGT Cerro Tololo C in Chile, 1 in MPEC 2013-B96 -- 2013 BS45
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2013-B96 -- 2001 HA4, 328059
711McDonald Obs. in Texas, 1 in MPEC 2013-B99 -- 2013 BN73
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2013-B97, 2013-B98 & 2013-B99 -- 2013 BP73, 2013 BO73, 2013 BN73
557Ondrejov Obs. in the Czech Republic, 1 in MPEC 2013-B96 -- 2013 BV15
I41Palomar Transient Factory in southern California, 1 in MPEC 2013-B96 -- 2011 MD
H36Sandlot Obs. in Kansas, 3 in MPEC 2013-B96 -- 2013 BV15, 2013 BT18, 2013 AS27
204Schiaparelli Obs. in Italy, 15 in MPEC 2013-B96 -- 2012 YY6, 2012 YD7, 2012 XY6, 2012 XT134, 2012 WP3, 2012 VJ82, 2012 KU42, 2012 HJ1, 2010 LR33, 2009 YG, 2009 WF106, 2004 XN14, 2004 LV3, 2004 CH52, 2003 YJ
291Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2013-B96, 2013-B97 & 2013-B98 -- 2013 BP73, 2013 BO73, 2013 BC18, 2013 AP60, 2013 AB32, 2012 XO111, 2012 TV78
926Tenagra II Obs. in Arizona, 1 in MPEC 2013-B96 -- 138175
2904Carl Hergenrother via Vatican Advanced Technology Telescope (VATT) in Arizona, 11 in MPEC 2013-B96 -- 2009 SQ104, 68278, 350713, 341050, 285263, 163364, 162783, 162004, 144411, 136793, 7350
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 31 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 BP73JPL Sentry17242051-2107651.6e-05-2.39-3.050JPL: "Analysis based on 15 observations spanning 8.9582 days (2013-Jan-22.24343 to 2013-Jan-31.20164)." Diameter approximately 0.310 km. from mean, weighted H=20.2.
2013 BJ18JPL Sentry23202020-2106211.7e-07-4.32-4.440JPL: "Analysis based on 18 observations spanning 3.9843 days (2013-Jan-16.50178 to 2013-Jan-20.4861)." Diameter approximately 0.240 km. from mean, weighted H=20.7.
2013 BU15JPL Sentry1724R E M O V E DJPL: Risk listing removed at 0952 UTC.
2013 AP60JPL Sentry1724R E M O V E DJPL: Risk listing removed at 0950 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 31 January '13

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

2320Noted that JPL Sentry has posted 2013 BJ18 as an impact risk - see above
1736Generated Traffic Report
1724Noted that JPL Sentry has removed 2013 AP60 as an impact risk - see above
Noted that JPL Sentry has posted 2013 BP73 as an impact risk - see above
Noted that JPL Sentry has removed 2013 BU15 as an impact risk - see above
Grabbed MPEC 2013-B96 - Daily Orbit Update - see above
Grabbed MPEC 2013-B97 - 2013 BO73 - see above
Grabbed MPEC 2013-B98 - 2013 BP73 - see above
Grabbed MPEC 2013-B99 - 2013 BN73 - see above