Contents  on 21 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 21 January '13

Three objects reported inside ten LD

Three asteroids are reported passing within a radius of ten lunar distances (LD) from our planet today. 2013 BT15 is outbound from 4.57 to 4.84 LD and the other two leave ten LD. 2013 AP72 travels from 8.86 to 10.76 LD and 2013 AT72 from 9.96 to 10.75 LD.

Coming our way next, risk-listed 2013 BV15 is calculated with great uncertainty to come inside ten LD on February 6th and intruder 2012 DA14 (risk-listed radar target) arrives on February 8th.

This report was generated at 1705 UTC with follow-up in today's DOU MPEC for 2013 AT72 and with the discovery of tiny intruder 2013 BR27 (MPEC), which is calculated with some uncertainty to have flown past Earth at 0.6 LD on January 15th and is now risk listed.

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 January '13

The MPC's NEO Confirmation Page has 57 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 57 objects listed. Of these, 45 were "one nighters." So far The Tracking News has counted a total of 106 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 January '13

Minor Planet Electronic Circulars

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

MPEC 2013-B66 - "22:31 UT" - 2012 SD22

MPEC 2013-B65 - "18:27 UT" - 2007 WY3

MPEC 2013-B64 - "12:45 UT" - 2013 BN27

MPEC 2013-B63 - "12:42 UT" - 2013 BR27

MPEC 2013-B62 - "12:39 UT" - 2013 BQ27

MPEC 2013-B61 - "12:36 UT" - 2013 BP27

MPEC 2013-B60 - "12:33 UT" - 2013 BO27

<< DOU on 21 Jan. '13 >>  MPEC 2013-B59 - "06:04 UT" - Daily Orbit Update

MPEC 2013-B58 - "02:41 UT" - P/2006 K2 = 2013 B1 (McNaught)

Observers  on 21 January '13

A total of 21 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPEC 2013-B59 -- 2013 AS27, 2013 AL11, 2013 AJ91, 2013 AG76, 2013 AB53, 2012 XF112, 2010 BB, 2006 KY86, 277039, 159533
I47Auger Obs. in Argentina, 1 in MPEC 2013-B59 -- 99942
300Bisei Spaceguard Center in Japan, 2 in MPECs 2013-B59 & 2013-B64 -- 2013 BN27, 12711
703Catalina Sky Survey (CSS) in Arizona, 13 in MPECs 2013-B59 & 2013-B64 -- 2013 BN27, 2013 AY52, 2008 RE80, 96315, 52762, 285263, 203471, 162011, 12711, 10165, 5836, 3199, 1036
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 7 in MPEC 2013-B59 -- 2013 BW2, 2013 BU2, 2013 BT18, 2013 BP18, 2012 XD55, 2012 XC112, 2012 SA22
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2013-B64 -- 2013 BN27
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2013-B59 -- 2013 BE19
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2013-B64 -- 2013 BN27
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2013-B59 -- 2012 YQ1
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2013-B65 -- 2007 WY3
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2013-B59 -- 2012 XF112
900Moriyama Obs. in Japan, 1 in MPEC 2013-B59 -- 12711
G96Mt. Lemmon Survey (MLS) in Arizona, 11 in MPECs 2013-B59, 2013-B60, 2013-B61, 2013-B62 & 2013-B63 -- 2013 BR27, 2013 BQ27, 2013 BP27, 2013 BO27, 2013 AT72, 2012 XF17, 2012 TQ78, 2005 MM13, 2004 TU11, 136793, 8013
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2013-B66 -- 2012 SD22
H36Sandlot Obs. in Kansas, 3 in MPECs 2013-B59, 2013-B62 & 2013-B64 -- 2013 BQ27, 2013 BN27, 2013 AS27
204Schiaparelli Obs. in Italy, 1 in MPEC 2013-B64 -- 2013 BN27
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2013-B59 -- 2001 XP88, 2000 BG19
291Spacewatch 1.8m telescope in Arizona, 10 in MPECs 2013-B58, 2013-B59 & 2013-B60 -- 2013 BP15, 2013 BO27, 2013 BJ18, 2013 BH18, 2013 BF18, P/2013 B1, 2013 AL20, 2013 AE69, 2012 YY6, 2012 YO1
926Tenagra II Obs. in Arizona, 1 in MPEC 2013-B59 -- 99942
2904Carl Hergenrother via Vatican Advanced Technology Telescope (VATT) in Arizona, 6 in MPEC 2013-B59 -- 2013 BN18, 2013 AS27, 2013 AR27, 2013 AQ60, 2013 AN20, 2012 XE17
H06iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2013-B64 -- 2013 BN27
H06|Hidetaka Sato in Japan via iTelescope Obs. Mayhill in New Mexico, 1 in MPEC 2013-B64 -- 2013 BN27
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 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 BR27JPL Sentry16042072-2084293.7e-05-5.88-6.270JPL: "Analysis based on 16 observations spanning .86546 days (2013-Jan-20.39041 to 2013-Jan-21.25587)." Diameter approximately 0.010 km. from mean, weighted H=27.7.
NEODyS16042069-2100876.08e-05-5.69-6.310NEODyS: "Based on 16 optical observations (of which 0 are rejected as outliers) from 2013-01-20.391 to 2013-01-21.257."
2013 BF18JPL Sentry1604R E M O V E DJPL: Risk listing removed at 0951 UTC.
99942 Apophis (2004 MN4)NEODyS16042036-2105197.4e-06-3.20-3.330NEODyS: "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 21 January '13

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

2308Grabbed MPEC 2013-B66 - 2012 SD22 - see above
1909Grabbed MPEC 2013-B65 - 2007 WY3 - see above
1705Generated Traffic Report
1604Noted that NEODyS has updated its 99942 Apophis (2004 MN4) risk assessment - see above
Noted that JPL Sentry has removed 2013 BF18 as an impact risk - see above
Noted that JPL Sentry has posted 2013 BR27 as an impact risk - see above
Noted that NEODyS has posted 2013 BR27 as an impact risk - see above
Grabbed MPEC 2013-B59 - Daily Orbit Update - see above
Grabbed MPEC 2013-B60 - 2013 BO27 - see above
Grabbed MPEC 2013-B61 - 2013 BP27 - see above
Grabbed MPEC 2013-B62 - 2013 BQ27 - see above
Grabbed MPEC 2013-B63 - 2013 BR27 - see above
Grabbed MPEC 2013-B64 - 2013 BN27 - see above
0358Grabbed MPEC 2013-B58 - P/2006 K2 = 2013 B1 (McNaught) - see above