Contents  on 8 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 8 January '13

Two objects reported inside ten LD

There are two objects reported moving within ten lunar distances (LD) of our planet today. 2013 AB4 comes inside ten LD, traveling from 10.17 to 8.72 LD, and 2013 AD4 leaves ten LD, passing from 9.89 to 11.67 LD. Next known to be coming this close is intruder 2012 DA14, a risk-listed radar target that arrives inside ten LD on February 8th.

This report was generated at 1726 UTC with the discovery of 2013 AT27 (MPEC), which dipped inside ten LD on the last day of the year, and today's DOU MPEC with the first follow-up for departed 2013 AC4 as well as observations of departed objects 2012 XO134 and 2012 XJ134.


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.

Radar Astrometry  on 8 January '13

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 2048 UTC when the database was dated 8 Jan.

NEOCP Activity  on 8 January '13

The MPC's NEO Confirmation Page has 24 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 24 objects listed. Of these, fourteen were "one nighters." So far The Tracking News has counted a total of 38 listings on the NEOCP today.

New MPECs  on 8 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-A45 - "22:50 UT" - Comet P/2013 A2 (Scotti)


MPEC 2013-A44 - "15:38 UT" - 2013 AU27


MPEC 2013-A43 - "13:53 UT" - 2013 AT27


MPEC 2013-A42 - "13:40 UT" - 2013 AS27


MPEC 2013-A41 - "13:37 UT" - 2013 AR27


MPEC 2013-A40 - "13:22 UT" - 2013 AQ27


MPEC 2013-A39 - "13:19 UT" - 2013 AP27


MPEC 2013-A38 - "13:16 UT" - 2013 AO27


<< DOU on 8 Jan. '13 >>  MPEC 2013-A37 - "06:03 UT" - Daily Orbit Update

Observers  on 8 January '13

A total of 39 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 28 in MPECs 2013-A37, 2013-A38, 2013-A40, 2013-A41, 2013-A42, 2013-A43 & 2013-A44 -- 2013 AU27, 2013 AT27, 2013 AS27, 2013 AR27, 2013 AQ27, 2013 AO27, 2013 AL11, 2013 AK11, 2013 AJ11, 2013 AE4, 2013 AC4, 2012 YY6, 2012 YQ1, 2012 YO1, 2012 YK, 2012 XY6, 2012 XT93, 2012 XR111, 2012 XO134, 2012 XH55, 2012 XC112, 2012 TQ139, 2012 TM139, 2012 QY14, 2012 LE11, 2002 XQ40, 2000 BO28, 18106
C77Bernezzo Obs. in Italy, 2 in MPECs 2013-A42 & 2013-A44 -- 2013 AU27, 2013 AS27
B88Bigmuskie Obs. in Italy, 1 in MPEC 2013-A37 -- 2012 YN6
300Bisei Spaceguard Center in Japan, 3 in MPECs 2013-A41, 2013-A42 & 2013-A44 -- 2013 AU27, 2013 AS27, 2013 AR27
235CAST Obs. in Italy, 3 in MPECs 2013-A37, 2013-A42 & 2013-A44 -- 2013 AU27, 2013 AS27, 2013 AN20
160Castelmartini Obs. in Italy, 13 in MPEC 2013-A37 -- 2012 YQ1, 2012 XE112, 2012 XD112, 349068, 345722, 338049, 331509, 249886, 230111, 229672, 214869, 203471, 137805
703Catalina Sky Survey (CSS) in Arizona, 9 in MPECs 2013-A37, 2013-A38 & 2013-A44 -- 2013 AU27, 2013 AO27, 52762, 285110, 154347, 12538, 6569, 5828, 3838
470Ceccano Obs. in Italy, 2 in MPECs 2013-A42 & 2013-A44 -- 2013 AU27, 2013 AS27
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2013-A38 -- 2013 AO27
850Cordell-Lorenz Obs. in Tennessee, 2 in MPECs 2013-A42 & 2013-A44 -- 2013 AU27, 2013 AS27
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2013-A37 -- 2012 XE133
I19El Gato Gris Obs. in Argentina, 1 in MPEC 2013-A38 -- 2013 AO27
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2013-A42 -- 2013 AS27
F65$Ernesto Guido in Italy via Faulkes Telescope North in Hawaii, 2 in MPECs 2013-A44 & 2013-A45 -- 2013 AU27, P/2013 A2
157Frasso Sabino Obs. in Italy, 3 in MPECs 2013-A37 & 2013-A38 -- 2013 AO27, 2012 XS93, 343098
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2002 AY1
651Grasslands Obs. in Arizona, 1 in MPEC 2013-A38 -- 2013 AO27
704LINEAR in New Mexico, 1 in MPEC 2013-A38 -- 2013 AO27
699LONEOS in Arizona, 1 in MPEC 2013-A37 -- 2012 XM145
J87La Canada Obs. in Spain, 1 in MPEC 2013-A38 -- 2013 AO27
J38La Vara Obs. in Spain, 1 in MPEC 2013-A37 -- 99942
H01Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2013-A38, 2013-A39 & 2013-A41 -- 2013 AR27, 2013 AP27, 2013 AO27
B67Mirasteilas Obs. in Switzerland, 1 in MPEC 2013-A42 -- 2013 AS27
900Moriyama Obs. in Japan, 2 in MPECs 2013-A38 & 2013-A44 -- 2013 AU27, 2013 AO27
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2013-A37, 2013-A38, 2013-A39, 2013-A40, 2013-A41, 2013-A42 & 2013-A43 -- 2013 AT27, 2013 AS27, 2013 AR27, 2013 AQ27, 2013 AP27, 2013 AO27, 2013 AF4, 2002 XQ40
A24New Millennium Obs. in Italy, 1 in MPEC 2013-A42 -- 2013 AS27
F51Pan-STARRS 1 (PS1) in Hawaii, 13 in MPEC 2013-A37 -- 2012 YP6, 2012 YL7, 2012 XQ93, 2012 XP111, 2009 YG, 2005 UC, 2002 AW, 1994 XD, 277127, 262623, 153958, 13553, 5587
461SZTE Asteroid Program in Hungary, 3 in MPECs 2013-A38, 2013-A42 & 2013-A44 -- 2013 AU27, 2013 AS27, 2013 AO27
104San Marcello Pistoiese Obs. in Italy, 5 in MPECs 2013-A38, 2013-A41, 2013-A42, 2013-A43 & 2013-A44 -- 2013 AU27, 2013 AT27, 2013 AS27, 2013 AR27, 2013 AO27
H36Sandlot Obs. in Kansas, 3 in MPECs 2013-A38, 2013-A42 & 2013-A44 -- 2013 AU27, 2013 AS27, 2013 AO27
204Schiaparelli Obs. in Italy, 5 in MPECs 2013-A38, 2013-A41, 2013-A42, 2013-A43 & 2013-A44 -- 2013 AU27, 2013 AT27, 2013 AS27, 2013 AR27, 2013 AO27
G25Sherbrooke Obs., 2 in MPEC 2013-A37 -- 6455, 1862
E12Siding Spring Survey in New South Wales, 1 in MPEC 2013-A37 -- 2005 DD
691Spacewatch 0.9m telescope in Arizona, 8 in MPECs 2013-A37, 2013-A39 & 2013-A45 -- 2013 AP27, P/2013 A2, 2012 QC8, 2002 AW, 2001 XP88, 85490, 136793, 4486
291Spacewatch 1.8m telescope in Arizona, 13 in MPECs 2013-A37, 2013-A39, 2013-A40, 2013-A41 & 2013-A45 -- 2013 AR27, 2013 AQ27, 2013 AP27, P/2013 A2, 2012 YK7, 2012 XS93, 2012 XQ111, 2012 XM134, 2012 XJ134, 2012 XH55, 2012 XF112, 2012 VP76, 2002 XQ40
C92Valdicerro Obs. in Italy, 1 in MPEC 2013-A43 -- 2013 AT27
I42Westport Obs. in Massachusetts, 3 in MPEC 2013-A37 -- 2012 YN6, 2012 XY6, 2012 XF112
I15Wishing Star Obs. in Rhode Island, 3 in MPEC 2013-A37 -- 2012 XS93, 2012 XF112, 2002 AY1
I89iTelescope Obs. Nerpio in Spain, 2 in MPECs 2013-A42 & 2013-A44 -- 2013 AU27, 2013 AS27
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 8 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2013 AE4JPL Sentry16282083-210132.8e-09-6.63-6.800JPL: "Analysis based on 25 observations spanning 3.9241 days (2013-Jan-03.46992 to 2013-Jan-07.394017)." Diameter approximately 0.220 km. from mean, weighted H=20.9.
2012 YQ1JPL Sentry1628R E M O V E DJPL: Risk listing removed at 0951 UTC.
2012 XE133JPL Sentry16282083-209132.7e-08-7.02-7.320JPL: "Analysis based on 99 observations spanning 23.689 days (2012-Dec-12.43361 to 2013-Jan-05.12216)." Diameter approximately 0.071 km. from mean, weighted H=23.4.

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 8 January '13

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

2359Grabbed MPEC 2013-A45 - Comet P/2013 A2 (Scotti) - see above
2048Noted Radar Astrometry database update - see above
1726Generated Traffic Report
1628Noted that JPL Sentry has updated its 2012 XE133 risk assessment - see above
Noted that JPL Sentry has removed 2012 YQ1 as an impact risk - see above
Noted that JPL Sentry has posted 2013 AE4 as an impact risk - see above
Grabbed MPEC 2013-A37 - Daily Orbit Update - see above
Grabbed MPEC 2013-A38 - 2013 AO27 - see above
Grabbed MPEC 2013-A39 - 2013 AP27 - see above
Grabbed MPEC 2013-A40 - 2013 AQ27 - see above
Grabbed MPEC 2013-A41 - 2013 AR27 - see above
Grabbed MPEC 2013-A42 - 2013 AS27 - see above
Grabbed MPEC 2013-A43 - 2013 AT27 - see above
Grabbed MPEC 2013-A44 - 2013 AU27 - see above