Contents  on 11 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 11 February '13

Five objects reported inside ten LD

There are five asteroids reported flying within ten lunar distances (LD) of Earth today. Radar target 2013 BV15 is inbound from 5.63 to 4.41 LD, radar target 2013 BS45 from 4.94 to 4.89 LD, and intruder 2012 DA14 (risk-listed radar target) from 6.74 to 5.35 LD, while risk-listed intruder 2013 CY is outbound from 8.21 to 8.81 LD and 2013 BA74 exits ten LD, traveling from 8.72 to 10.13 LD.

Next known to be coming into the ten-LD "bubble" are newly announced 2013 CE82, which arrives inside ten LD on February 14th, and risk-listed 2007 EO88, arriving on March 15th.

This report was generated at 1906 UTC with new discovery 2013 CE82 (MPEC) and follow-up in today's DOU MPEC for 2013 BV15, 2012 DA14, and departed risk-listed 2013 CL22 (extending its observing arc from 2.09 to 4.90 days).

2359 UTC update: JPL is reporting radar observation of 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.

Radar Astrometry  on 11 February '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 2359 UTC when the database was dated 11 Feb.

NEOCP Activity  on 11 February '13

The MPC's NEO Confirmation Page has 43 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 43 objects listed. Of these, eighteen were "one nighters." So far The Tracking News has counted a total of 51 listings on the NEOCP today.

New MPECs  on 11 February '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-C48 - "17:13 UT" - 2013 CE82

MPEC 2013-C47 - "14:24 UT" - 2013 BO76

<< DOU on 11 Feb. '13 >>  MPEC 2013-C46 - "06:03 UT" - Daily Orbit Update

MPEC 2013-C45 - "03:37 UT" - 2008 AU26

Observers  on 11 February '13

A total of 22 observers appear in today's MPECs.

CodeObserver / observatory
924Cegep de Trois-Rivieres Obs. in Quebec, 1 in MPEC 2013-C46 -- 2013 BV15
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 6 in MPECs 2013-C46 & 2013-C48 -- 2013 CR35, 2013 CN35, 2013 CE82, 2012 QP17, 2010 QD2, 2008 DG17
639Dresden Obs. in Germany, 2 in MPEC 2013-C46 -- 99942, 11405
157Frasso Sabino Obs. in Italy, 2 in MPEC 2013-C46 -- 2013 CR35, 2002 BP26
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2013 BV15
D00ISON-Kislovodsk Obs., 2 in MPEC 2013-C46 -- 2013 CL22, 2006 DY
W86LCOGT Cerro Tololo B in Chile, 1 in MPEC 2013-C46 -- 2012 DA14
J131National Schools Obs. via the Liverpool Telescope in the Canary Islands, 13 in MPEC 2013-C46 -- 2012 YQ1, 2012 YN6, 2012 XD133, 2012 VE37, 2012 QJ2, 2012 QB17, 2009 SB15, 2006 WR127, 2004 TL19, 339714, 329275, 281375, 189173
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2013-C46 -- 2013 CL22, 2012 RV16
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2013-C47 -- 2013 BO76
474Mt. John Obs. in New Zealand, 2 in MPECs 2013-C45 & 2013-C46 -- 2012 DA14, 2008 AU26
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2013-C48 -- 2013 CE82
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2013-C46 -- 2009 SC15
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2013-C46 -- 329669
A24New Millennium Obs. in Italy, 10 in MPEC 2013-C46 -- 2012 QF49, 2012 PQ28, 349068, 177651, 177049, 153219, 5646, 3908, 2212, 2062
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2013-C46 -- 2101
I61Ourense Obs., 1 in MPEC 2013-C46 -- 99942
C27Pallerols Obs. in Spain, 4 in MPEC 2013-C46 -- 99942, 343098, 152889, 4179
F51Pan-STARRS 1 (PS1) in Hawaii, 16 in MPECs 2013-C46, 2013-C47 & 2013-C48 -- 2013 CP35, 2013 CE82, 2013 BR45, 2013 BO76, 2013 AW52, 2013 AP27, 2012 XF17, 2012 LK9, 2005 SG19, 296318, 177049, 163697, 137925, 11054, 9172, 8507
D29Purple Mtn. Obs. Xuyi Station in China, 6 in MPEC 2013-C46 -- 2013 CW35, 68278, 350513, 137925, 11284, 4179
291Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2013-C47 -- 2013 BO76
926Tenagra II Obs. in Arizona, 1 in MPEC 2013-C46 -- 2011 BK24
J08Zonalunar Obs. in Spain, 1 in MPEC 2013-C46 -- 99942
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 11 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 CL22JPL Sentry1725206433.4e-06-5.41-5.600JPL: "Analysis based on 55 observations spanning 4.9009 days (2013-Feb-05.05792 to 2013-Feb-09.9588)." Diameter approximately 0.039 km. from mean, weighted H=24.7.
NEODyS17252064-206426.3e-07-6.14-6.190NEODyS: "Based on 55 optical observations (of which 1 are rejected as outliers) from 2013-02-05.059 to 2013-02-09.960."
2012 DA14JPL Sentry17252080-210952.0e-05-4.60-4.670JPL: "Analysis based on 268 observations spanning 353.49 days (2012-Feb-23.03431 to 2013-Feb-10.5288)." Diameter approximately 0.051 km. from mean, weighted H=24.1.
NEODyS17252080-209778.75e-05-3.93-3.960NEODyS: "Based on 271 optical observations (of which 4 are rejected as outliers) from 2012-02-23.029 to 2013-02-10.530."

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 11 February '13

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

2359Noted Radar Astrometry database update - see above
1906Generated Traffic Report
1725Noted that JPL Sentry has updated its 2012 DA14 risk assessment - see above
Noted that NEODyS has updated its 2012 DA14 risk assessment - see above
Noted that JPL Sentry has updated its 2013 CL22 risk assessment - see above
Noted that NEODyS has updated its 2013 CL22 risk assessment - see above
Grabbed MPEC 2013-C46 - Daily Orbit Update - see above
Grabbed MPEC 2013-C47 - 2013 BO76 - see above
Grabbed MPEC 2013-C48 - 2013 CE82 - see above
0556Grabbed MPEC 2013-C45 - 2008 AU26 - see above