Contents  on 24 January '12

Note: These A/CC news pages will update less often and less regularly than usual through Friday, January 27th.


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 24 January '12

Five objects reported inside ten LD

Five objects are reported moving inside ten lunar distances (LD) of Earth today. Within Earth's Hill sphere, risk-listed 2012 BY1 comes its closest to Earth this time around, reaching 2.04 LD at 0847 UTC, and its closest to the Moon--2.34 LD at 1330 UTC, 2012 BS1 is departing, traveling from 3.12 to 3.81 LD, and risk-listed 2012 BW13 enters Earth's Hill sphere. Further out, intruder 2012 BV1 is heading away from 7.15 to 9.06 LD and risk-listed 2012 BF27 departs from inside ten LD, passing from 9.78 to 12.84 LD.

Next up, 2012 BD14 arrives inside ten LD tomorrow and radar target 2011 CP4 arrives inside ten LD on February 22nd.

This report was updated at 1411 UTC with new discovery 2012 BF27 (MPEC) and follow-up in today's DOU MPEC for 2012 BD14, 2012 BW13, and 2012 BY1.

Notes: Ten LD has no astronomical significance but is a useful reporting boundary. Earth's Hill sphere (of gravitational influence) has a radius estimated at about 3.89 LD. 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 24 January '12

The MPC's NEO Confirmation Page has 5 listings

When last checked at 2352 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had five objects listed. All of these 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 24 January '12

Minor Planet Electronic Circulars

As of last check at 2352 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2012-B58 - "12:21 UT" - 2012 BF27

MPEC 2012-B57 - "12:19 UT" - 2012 BE27

MPEC 2012-B56 - "12:17 UT" - 2012 BD27

<< DOU on 24 Jan. '12 >>  MPEC 2012-B55 - "06:04 UT" - Daily Orbit Update

Observers  on 24 January '12

A total of 27 observers appear in today's MPECs.

CodeObserver / observatory
J94Abbeydale Obs. in England, 1 in MPEC 2012-B55 -- 21088
300Bisei Spaceguard Center in Japan, 2 in MPECs 2012-B55 & 2012-B58 -- 2012 BJ11, 2012 BF27
B66Casasco Obs. in Italy, 2 in MPEC 2012-B55 -- 310842, 1620
160Castelmartini Obs. in Italy, 2 in MPEC 2012-B55 -- 310842, 192642
703Catalina Sky Survey (CSS) in Arizona, 6 in MPECs 2012-B55, 2012-B56 & 2012-B58 -- 2012 BX13, 2012 BF27, 2012 BD27, 85990, 53319, 141765
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2012-B57 -- 2012 BE27
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2012-B55 -- 2012 BT23
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 2 in MPECs 2012-B55 & 2012-B57 -- 2012 BR23, 2012 BE27
E10Faulkes Telescope South in New South Wales, 1 in MPEC 2012-B55 -- 2012 BT23
203GiaGa Obs. in Italy, 4 in MPECs 2012-B55 & 2012-B56 -- 2012 BD27, 2012 BB2, 2012 AA11, 310442
J95Great Shefford Obs. in England, 4 in MPECs 2012-B55, 2012-B56 & 2012-B58 -- 2012 BY1, 2012 BW13, 2012 BF27, 2012 BD27
458Guadarrama Obs. in Spain, 1 in MPEC 2012-B55 -- 3200
379Hamamatsu-Yuto Obs. in Japan, 2 in MPEC 2012-B55 -- 2011 SL102, 209924
G47HillTopTop Obs., 3 in MPEC 2012-B55 -- 262623, 15817, 2340
695{Tomas Vorobjov in England via Kitt Peak Natl. Obs. (KPNO) in Arizona, 2 in MPECs 2012-B56 & 2012-B58 -- 2012 BF27, 2012 BD27
704LINEAR in New Mexico, 10 in MPEC 2012-B55 -- 2012 BA14, 2011 YV15, 96590, 275792, 209924, 190208, 138911, 137925, 4183, 1627
560Madonna di Dossobuono Obs. in Italy, 4 in MPEC 2012-B55 -- 2011 XO3, 2011 WV134, 2011 SL102, 2008 WZ13
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2012-B56 -- 2012 BD27
A24New Millennium Obs. in Italy, 18 in MPECs 2012-B55, 2012-B56 & 2012-B58 -- 2012 BF27, 2012 BD27, 2011 SL102, 1996 AE2, 99799, 85839, 32906, 29075, 21088, 162186, 153951, 142348, 141018, 10145, 6050, 3103, 1627, 1620
F51Pan-STARRS 1 (PS1) in Hawaii, 2 in MPECs 2012-B55 & 2012-B57 -- 2012 BE27, 3352
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 6 in MPEC 2012-B55 -- 2011 YV15, 2011 XE1, 2008 QY, 310442, 3103, 433
I20Rio Cuarto Obs. in Argentina, 1 in MPEC 2012-B55 -- 2012 BG11
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2012-B56 -- 2012 BD27
H36Sandlot Obs. in Kansas, 2 in MPEC 2012-B55 -- 2012 BD14, 2012 AS10
204Schiaparelli Obs. in Italy, 3 in MPECs 2012-B56, 2012-B57 & 2012-B58 -- 2012 BF27, 2012 BE27, 2012 BD27
645Sloan Digital Sky Survey (SDSS) in New Mexico, 15 in MPEC 2012-B55 -- 2005 LZ42, 2005 HB4, 2004 RK9, 2004 CR2, 2002 VD118, 2001 SD348, 54789, 26760, 240320, 223456, 21277, 211914, 21088, 209924, 20790
A48Verona Obs. in Italy, 1 in MPEC 2012-B55 -- 2012 BJ11
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 24 January '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2352 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 BF27JPL Sentry1410204319.9e-07-6.27-6.270JPL: "Analysis based on 28 observations spanning .66684 days (2012-Jan-23.33706 to 2012-Jan-24.0039)." Diameter approximately 0.020 km. from mean, weighted H=26.1.
2012 BW13JPL Sentry13002072-211185.1e-06-6.57-6.860JPL: "Analysis based on 24 observations spanning 4.8264 days (2012-Jan-19.20743 to 2012-Jan-24.03379)." Diameter approximately 0.013 km. from mean, weighted H=27.1.
NEODyS13002072-207216.82e-08-8.27-8.270NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2012-01-19.208 to 2012-01-24.035."
2012 BY1JPL Sentry13002043-210193.9e-06-5.55-5.840JPL: "Analysis based on 23 observations spanning 5.6321 days (2012-Jan-18.39002 to 2012-Jan-24.022092)." Diameter approximately 0.023 km. from mean, weighted H=25.8.
NEODyS13002043-208193.56e-06-5.58-5.850NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2012-01-18.391 to 2012-01-24.023."

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 24 January '12

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

1411Posted Traffic Report
1410Noted that JPL Sentry has posted 2012 BF27 as an impact risk - see above
1300Noted that JPL Sentry has updated its 2012 BW13 risk assessment - see above
Noted that NEODyS has updated its 2012 BW13 risk assessment - see above
Noted that JPL Sentry has updated its 2012 BY1 risk assessment - see above
Noted that NEODyS has updated its 2012 BY1 risk assessment - see above
Grabbed MPEC 2012-B55 - Daily Orbit Update - see above
Grabbed MPEC 2012-B56 - 2012 BD27 - see above
Grabbed MPEC 2012-B57 - 2012 BE27 - see above
Grabbed MPEC 2012-B58 - 2012 BF27 - see above