Contents  on 3 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 3 February '12

Two objects reported inside ten LD

There are two visitors reported within ten lunar distances (LD) of Earth today. Risk-listed 2012 CU is outbound from 5.60 to 7.86 LD and 2012 BD14 is heading out from 7.61 to 8.75 LD. Up next, radar target 2011 CP4 arrives inside ten LD on February 22nd.

This report was updated at 2217 UTC with new discovery 2012 CU (MPEC) and follow-up in today's DOU MPEC for 2012 BO11. This report was previously updated at 1502 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 3 February '12

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 3 Feb.

NEOCP Activity  on 3 February '12

The MPC's NEO Confirmation Page has 18 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eighteen objects listed. Of these, ten were "one nighters." So far The Tracking News has counted a total of 31 listings on the NEOCP today.

New MPECs  on 3 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-C21 - "20:02 UT" - 2012 CU

MPEC 2012-C20 - "19:59 UT" - 2012 CT

MPEC 2012-C19 - "19:56 UT" - 2012 CS

MPEC 2012-C18 - "19:52 UT" - 2012 CR

MPEC 2012-C17 - "19:33 UT" - 2006 AL8

MPEC 2012-C16 - "13:12 UT" - 2012 CG

<< DOU on 3 Feb. '12 >>  MPEC 2012-C15 - "06:06 UT" - Daily Orbit Update

Observers  on 3 February '12

Sixteen observers appear in today's MPECs.

CodeObserver / observatory
I69AGM Obs., 1 in MPEC 2012-C15 -- 2011 YV15
703Catalina Sky Survey (CSS) in Arizona, 8 in MPEC 2012-C15 -- 2011 YV15, 2011 YM63, 21277, 137802, 7092, 4183, 3352, 1862
8073program code 3 via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPEC 2012-C15 -- 2012 BO77, 2012 BM77, 2012 AC3
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPECs 2012-C19, 2012-C20 & 2012-C21 -- 2012 CU, 2012 CT, 2012 CS
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2006 CJ
J95Great Shefford Obs. in England, 6 in MPECs 2012-C15, 2012-C16, 2012-C17, 2012-C19, 2012-C20 & 2012-C21 -- 2012 CU, 2012 CT, 2012 CS, 2012 CG, 2012 BC102, 2006 AL8
I67Hartley Wintney Obs., 1 in MPEC 2012-C15 -- 1036
704LINEAR in New Mexico, 4 in MPECs 2012-C15 & 2012-C21 -- 2012 CU, 2011 YM63, 308127, 153951
130Lumezzane Obs. in Italy, 4 in MPEC 2012-C15 -- 2012 AA11, 2005 NJ1, 2004 YU5, 2003 AF23
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-C15 -- 2012 BM86
G96Mt. Lemmon Survey (MLS) in Arizona, 8 in MPECs 2012-C15, 2012-C16, 2012-C18, 2012-C19 & 2012-C20 -- 2012 CT, 2012 CS, 2012 CR, 2012 CG, 2012 CA, 2011 SR69, 35396, 310402
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2012-C15 -- 1999 AU23
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 3 in MPECs 2012-C15 & 2012-C20 -- 2012 CT, 2012 BB124, 2011 YH28
854Sabino Canyon Obs. in Arizona, 2 in MPECs 2012-C20 & 2012-C21 -- 2012 CU, 2012 CT
691Spacewatch 0.9m telescope in Arizona, 8 in MPEC 2012-C15 -- 2012 BB124, 96631, 85990, 53319, 31346, 192642, 189008, 5693
291Spacewatch 1.8m telescope in Arizona, 19 in MPECs 2012-C15, 2012-C16, 2012-C18, 2012-C19 & 2012-C20 -- 2012 CT, 2012 CS, 2012 CR, 2012 CG, 2012 BZ34, 2012 BV26, 2012 BO11, 2012 BN11, 2012 BM86, 2012 BL86, 2012 BK11, 2012 BH86, 2012 BC77, 2012 AW12, 2011 YB29, 2011 WS2, 2011 WQ46, 2010 SO16, 2005 PO
H10Tzec Maun Obs. Mayhill in New Mexico, 1 in MPEC 2012-C15 -- 433
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 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 CUJPL Sentry2203204411.5e-10-10.01-10.00JPL: "Analysis based on 16 observations spanning .97758 days (2012-Feb-02.40401 to 2012-Feb-03.38159)." Diameter approximately 0.024 km. from mean, weighted H=25.7.
2012 BM86JPL Sentry1454210228.2e-08-5.64-5.660JPL: "Analysis based on 23 observations spanning 3.7692 days (2012-Jan-29.55767 to 2012-Feb-02.32688)." Diameter approximately 0.150 km. from mean, weighted H=21.8.
2012 BL86JPL Sentry1454R E M O V E DJPL: Risk listing removed at 0850 UTC.
2012 BJ86NEODyS14542085-208512.21e-07-5.06-5.060NEODyS: "Based on 31 optical observations (of which 0 are rejected as outliers) from 2012-01-29.102 to 2012-02-01.806."
2012 BO11NEODyS1454R E M O V E D-

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 3 February '12

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

2359Noted Radar Astrometry database update - see above
2217Updated Traffic Report
2203Noted that JPL Sentry has posted 2012 CU as an impact risk - see above
2040Grabbed MPEC 2012-C17 - 2006 AL8 - see above
Grabbed MPEC 2012-C18 - 2012 CR - see above
Grabbed MPEC 2012-C19 - 2012 CS - see above
Grabbed MPEC 2012-C20 - 2012 CT - see above
Grabbed MPEC 2012-C21 - 2012 CU - see above
1454Noted that NEODyS has updated its 2012 BJ86 risk assessment - see above
Noted that JPL Sentry has removed 2012 BL86 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 BM86 risk assessment - see above
Noted that NEODyS has removed 2012 BO11 as an impact risk - see above
Grabbed MPEC 2012-C15 - Daily Orbit Update - see above
Grabbed MPEC 2012-C16 - 2012 CG - see above