Contents  on 15 February '12


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 15 February '12

No objects reported inside ten LD

No objects are reported traveling within ten lunar distances (LD) of Earth today. Headed our way, radar target 2011 CP4 arrives inside ten LD on February 22nd and 2008 EJ85 comes inside ten LD on March 4th.

This report was updated at 1651 UTC with follow-up in today's DOU MPEC for 2011 CP4. This report was first posted at 0043 UTC.

Notes: Ten LD has no astronomical significance but is a useful reporting boundary. Distances are interpreted by A/CC from JPL Horizons data. See also today's timeline plus current additional details, sky chart, and ephemerides.

Radar Astrometry  on 15 February '12

Radar observation of two objects

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

Data update noted at 0042 UTC when the database was dated 14 Feb.

Data update noted at 2359 UTC when the database was dated 15 Feb.

NEOCP Activity  on 15 February '12

The MPC's NEO Confirmation Page has 26 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 26 objects listed. Of these, 21 were "one nighters." So far The Tracking News has counted a total of 39 listings on the NEOCP today.

New MPECs  on 15 February '12

Minor Planet Electronic Circulars

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

MPEC 2012-C58 - "20:38 UT" - 2012 CM29

MPEC 2012-C57 - "20:10 UT" - 2012 CL29

MPEC 2012-C56 - "17:43 UT" - 2010 DO

MPEC 2012-C55 - "12:57 UT" - 2012 CD29

MPEC 2012-C54 - "12:55 UT" - 2012 CC29

<< DOU on 15 Feb. '12 >>  MPEC 2012-C53 - "06:03 UT" - Daily Orbit Update

MPEC 2012-C52 - "04:04 UT" - Comet C/2012 C2 (Bruenjes)

Observers  on 15 February '12

A total of 24 observers appear in today's MPECs.

CodeObserver / observatory
251Arecibo in Puerto Rico, 2 in radar -- 2011 WN2, 162421
C77Bernezzo Obs. in Italy, 1 in MPEC 2012-C52 -- C/2012 C2
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPECs 2012-C53 & 2012-C55 -- 2012 CD29, 2012 BO77, 2012 AT22
822Cordoba Obs. in Argentina, 1 in MPEC 2012-C53 -- 2012 BT23
I17Cupillari Obs. in Pennsylvania, 11 in MPECs 2012-C52 & 2012-C53 -- C/2012 C2, 2012 BT23, 2012 BC124, 85839, 32906, 21088, 162186, 153951, 143651, 138524, 138013
719Etscorn Obs. in New Mexico, 1 in MPEC 2012-C53 -- 1917
F65$Ernesto Guido in Italy via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-C55 -- 2012 CD29
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 2 in MPECs 2012-C54 & 2012-C56 -- 2012 CC29, 2010 DO
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 162421
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2012-C55 -- 2012 CD29
168Kourovskaya Obs. in Russia, 7 in MPEC 2012-C53 -- 310442, 29075, 263976, 162421, 153951, 141018, 1620
J75La Sagra Obs. in Spain, 1 in MPEC 2012-C55 -- 2012 CD29
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-C53 -- 2012 BL77
I89Nerpio Obs. in Italy, 1 in MPEC 2012-C52 -- C/2012 C2
A24New Millennium Obs. in Italy, 1 in MPEC 2012-C55 -- 2012 CD29
F51Pan-STARRS 1 (PS1) in Hawaii, 14 in MPECs 2012-C53, 2012-C54 & 2012-C56 -- 2012 CC29, 2010 DO, 2002 XQ40, 35396, 312942, 289315, 276049, 275976, 238063, 192642, 163000, 162038, 152667, 3271
H36Sandlot Obs. in Kansas, 3 in MPECs 2012-C55, 2012-C57 & 2012-C58 -- 2012 CM29, 2012 CL29, 2012 CD29
D93Sendai Obs. in Japan, 1 in MPEC 2012-C52 -- C/2012 C2
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-C53 -- 2011 CP4
691Spacewatch 0.9m telescope in Arizona, 2 in MPECs 2012-C57 & 2012-C58 -- 2012 CM29, 2012 CL29
291Spacewatch 1.8m telescope in Arizona, 5 in MPECs 2012-C54, 2012-C55, 2012-C56, 2012-C57 & 2012-C58 -- 2012 CM29, 2012 CL29, 2012 CD29, 2012 CC29, 2010 DO
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2012-C52 -- C/2012 C2
H47Vicksburg Obs. in Mississippi, 1 in MPEC 2012-C52 -- C/2012 C2
367Yatsuka Obs. in Japan, 1 in MPEC 2012-C52 -- C/2012 C2
J08Zonalunar Obs. in Spain, 1 in MPEC 2012-C52 -- C/2012 C2
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 15 February '12

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
2012 CC29JPL Sentry16492079-208722.7e-09-6.99-7.270JPL: "Analysis based on 16 observations spanning 2.0006 days (2012-Feb-13.45335 to 2012-Feb-15.454)." Diameter approximately 0.133 km. from mean, weighted H=22.1.
2012 CA21NEODyS16502030-207845.2e-07-3.12-3.410NEODyS: "Based on 34 optical observations (of which 1 are rejected as outliers) from 2012-02-12.121 to 2012-02-14.039."

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 15 February '12

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

2359Noted Radar Astrometry database update - see above
2101Grabbed MPEC 2012-C58 - 2012 CM29 - see above
2015Grabbed MPEC 2012-C57 - 2012 CL29 - see above
1906Grabbed MPEC 2012-C56 - 2010 DO - see above
1651Updated Traffic Report
1649Noted that NEODyS has posted 2012 CA21 as an impact risk - see above
Noted that JPL Sentry has posted 2012 CC29 as an impact risk - see above
Grabbed MPEC 2012-C53 - Daily Orbit Update - see above
Grabbed MPEC 2012-C54 - 2012 CC29 - see above
Grabbed MPEC 2012-C55 - 2012 CD29 - see above
0449Grabbed MPEC 2012-C52 - Comet C/2012 C2 (Bruenjes) - see above
0042Noted Radar Astrometry database update - see above