Contents  on 16 January '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 16 January '12

Two objects reported inside ten LD

Two objects are reported passing within ten lunar distances (LD) of our planet today. 2012 AQ10 comes its closest to Earth on this passage -- 2.24 LD at 1252 UTC, and its closest to the Moon -- 2.08 LD at 2134 UTC. And radar target 2011 YH40 comes its closest to Earth this time around -- 5.36 LD at 1736 UTC.

Headed our way, radar target 2011 CP4 arrives inside ten LD on February 22nd.

This report was updated at 1656 UTC with follow-up in today's DOU MPEC for 2012 AQ10 and 2011 YH40, and for departed 2012 AW10 and 2012 AP10.

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 16 January '12

The MPC's NEO Confirmation Page has 9 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nine objects listed. Of these, two were "one nighters." So far The Tracking News has counted a total of fourteen 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 16 January '12

Minor Planet Electronic Circulars

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

<< DOU on 16 Jan. '12 >>  MPEC 2012-B01 - "06:03 UT" - Daily Orbit Update

Observers  on 16 January '12

Eighteen observers appear in today's MPEC.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 10 in MPEC 2012-B01 -- 2012 AY, 2012 AW10, 2012 AW, 2012 AS10, 2012 AQ10, 2012 AM10, 2012 AE1, 2012 AA3, 2011 YH40, 2011 VW5
160Castelmartini Obs. in Italy, 1 in MPEC 2012-B01 -- 2011 XO3
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 3 in MPEC 2012-B01 -- 2011 YH28, 2011 WA96, 2006 WN3
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 3 in MPEC 2012-B01 -- 2012 AN10, 2011 XE1, 2003 AF23
151Eschenberg Obs. in Switzerland, 3 in MPEC 2012-B01 -- 2011 WV134, 2008 WZ13, 2003 AF23
J95Great Shefford Obs. in England, 4 in MPEC 2012-B01 -- 2012 AS10, 2012 AQ10, 2012 AP10, 2011 YH40
240Herrenberg Obs. in Germany, 2 in MPEC 2012-B01 -- 225586, 152671
704LINEAR in New Mexico, 4 in MPEC 2012-B01 -- 2012 AB11, 2006 MJ10, 85839, 237805
844Los Molinos Obs. in Uruguay, 1 in MPEC 2012-B01 -- 312473
608NEAT's USAF Haleakala telescope in Hawaii, 1 in MPEC 2012-B01 -- 85989
A24New Millennium Obs. in Italy, 2 in MPEC 2012-B01 -- 2011 YH40, 2003 AF23
J69North Obs. in England, 1 in MPEC 2012-B01 -- 2012 AQ10
J43Oukaimeden Obs. in Morocco, 1 in MPEC 2012-B01 -- 138911
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2012-B01 -- 25916
104San Marcello Pistoiese Obs. in Italy, 3 in MPEC 2012-B01 -- 2011 YZ28, 2011 YH28, 2003 AF23
204Schiaparelli Obs. in Italy, 8 in MPEC 2012-B01 -- 2012 AQ10, 2011 YH40, 2011 SR69, 2011 QF14, 2011 FZ2, 2002 AC, 29075, 175706
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2012-B01 -- 2012 AA11
H47Vicksburg Obs. in Mississippi, 3 in MPEC 2012-B01 -- 2011 YV15, 2011 YH40, 433
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 16 January '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 AS10JPL Sentry1602R E M O V E DJPL: Risk listing removed at 0852 UTC.
2012 AP10JPL Sentry16022062-2111951.4e-04-4.83-5.550JPL: "Analysis based on 43 observations spanning 4.7847 days (2012-Jan-11.08359 to 2012-Jan-15.86831)." Diameter approximately 0.019 km. from mean, weighted H=26.3.
2011 YH28JPL Sentry1602R E M O V E DJPL: Risk listing removed at 0849 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 16 January '12

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

1656Updated Traffic Report
1602Noted that JPL Sentry has removed 2011 YH28 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 AP10 risk assessment - see above
Noted that JPL Sentry has removed 2012 AS10 as an impact risk - see above
Grabbed MPEC 2012-B01 - Daily Orbit Update - see above