Contents  on 14 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 14 February '12

No objects reported inside ten LD

No asteroids are reported inside ten lunar distances (LD) of Earth today. Coming up, radar target 2011 CP4 comes inside ten LD on February 22nd and 2008 EJ85 arrives on March 4th.

This report was posted at 1631 UTC with follow-up in today's DOU MPEC for 2011 CP4 and for departed 2012 CU, 2012 BV61, 2011 YT62, 2011 YL28, and 2011 YX15 .

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.

NEOCP Activity  on 14 February '12

The MPC's NEO Confirmation Page has 25 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 25 objects listed. Of these, nineteen were "one nighters." So far The Tracking News has counted a total of 39 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 14 February '12

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 2012-C51 - "13:09 UT" - 2012 CA21

MPEC 2012-C50 - "12:52 UT" - 2012 BJ134

<< DOU on 14 Feb. '12 >>  MPEC 2012-C49 - "06:03 UT" - Daily Orbit Update

MPEC 2012-C48 - "03:13 UT" - Comet C/2012 CH17 (MOSS)

Observers  on 14 February '12

A total of 23 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 18 in MPECs 2012-C49 & 2012-C51 -- 2012 CT, 2012 CC17, 2012 CA21, 2012 BT61, 2012 BO77, 2012 BL86, 2012 BK77, 2012 BE86, 2012 BC124, 2012 BB124, 2012 AS10, 2012 AE1, 2012 AA11, 2011 YT62, 2011 YL6, 2011 YG6, 2011 YB40, 2011 XE1
I47Auger Obs. in Argentina, 1 in MPEC 2012-C49 -- 2008 EP6
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2012-C48 & 2012-C51 -- C/2012 CH17, 2012 CA21
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPECs 2012-C49 & 2012-C51 -- 2012 CA21, 2012 BZ76, 2012 BB77
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2012-C49 -- 2012 BC124
106Crni Vrh Obs. in Slovenia, 2 in MPECs 2012-C49 & 2012-C50 -- 2012 BJ134, 137802
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 2 in MPEC 2012-C49 -- 2011 YX15, 2011 YL28
I19El Gato Gris Obs. in Argentina, 1 in MPEC 2012-C51 -- 2012 CA21
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-C51 -- 2012 CA21
118Modra Obs. in Slovakia, 1 in MPEC 2012-C51 -- 2012 CA21
G96Mt. Lemmon Survey in Arizona, 1 in MPEC 2012-C50 -- 2012 BJ134
I89Nerpio Obs. in Italy, 1 in MPEC 2012-C48 -- C/2012 CH17
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2012-C48 -- C/2012 CH17
F51Pan-STARRS 1 (PS1) in Hawaii, 9 in MPEC 2012-C49 -- 2012 CP2, 2012 BB124, 2002 EH1, 314079, 313548, 312956, 192642, 162038, 6050
5611Janos Kelemen via Piszkesteto Station in Hungary, 1 in MPEC 2012-C49 -- 311555
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-C50 -- 2012 BJ134
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-C49 -- 2011 CP4
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2012-C49 & 2012-C50 -- 2012 BJ134, 2011 PS, 276049, 4055
291Spacewatch 1.8m telescope in Arizona, 14 in MPECs 2012-C48, 2012-C49, 2012-C50 & 2012-C51 -- 2012 CU, 2012 CP2, C/2012 CH17, 2012 CA21, 2012 BV61, 2012 BS23, 2012 BN11, 2012 BL86, 2012 BK11, 2012 BJ134, 2012 BE124, 2012 AW12, 2012 AD3, 2000 JO78
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2012-C51 -- 2012 CA21
B18Terskol Obs. in Russia, 2 in MPECs 2012-C50 & 2012-C51 -- 2012 CA21, 2012 BJ134
B51Vallauris Obs. in France, 1 in MPEC 2012-C48 -- C/2012 CH17
A48Verona Obs. in Italy, 1 in MPEC 2012-C49 -- 2011 SL102
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 14 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 CA21JPL Sentry16272030-2101101.4e-06-2.79-3.270JPL: "Analysis based on 34 observations spanning 1.9184 days (2012-Feb-12.12022 to 2012-Feb-14.03858)." Diameter approximately 0.525 km. from mean, weighted H=19.1.
2012 CUJPL Sentry16272040-210041.4e-06-6.55-6.830JPL: "Analysis based on 44 observations spanning 11.015 days (2012-Feb-02.40401 to 2012-Feb-13.41894)." Diameter approximately 0.022 km. from mean, weighted H=26.0.
NEODyS16272040-208336.71e-08-7.46-7.490NEODyS: "Based on 40 optical observations (of which 0 are rejected as outliers) from 2012-02-02.405 to 2012-02-13.420."
2010 AR85JPL Sentry2204R E M O V E DJPL: Risk listing removed at 2127 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 14 February '12

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

2204Noted that JPL Sentry has removed 2010 AR85 as an impact risk - see above
1631Posted Traffic Report
1627Noted that JPL Sentry has posted 2012 CA21 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 CU risk assessment - see above
Noted that NEODyS has updated its 2012 CU risk assessment - see above
Grabbed MPEC 2012-C49 - Daily Orbit Update - see above
Grabbed MPEC 2012-C50 - 2012 BJ134 - see above
Grabbed MPEC 2012-C51 - 2012 CA21 - see above
0331Grabbed MPEC 2012-C48 - Comet C/2012 CH17 (MOSS) - see above