Contents  on 25 January '12

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

Resources:

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Traffic Report  on 25 January '12

Five objects reported inside ten LD

Five objects are reported inside ten lunar distances (LD) of Earth today. Risk-listed 2012 BW13 moves from 3.74 to 1.85 LD inside Earth's Hill sphere while 2012 BS1 and risk-listed 2012 BY1 exit Earth's Hill sphere. Further out, intruder 2012 BV1 departs from inside ten LD, traveling from 9.06 to 10.98 LD, and 2012 BD14 enters ten LD, moving from 11.18 to 9.83 LD.

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

This report was updated at 1443 UTC with follow-up in today's DOU MPEC for 2012 BD14, 2012 BZ13, 2012 BW13, 2012 BY1, and 2012 BX1.


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 25 January '12

The MPC's NEO Confirmation Page has 61 listings

When last checked at 2030 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 61 objects listed. Of these, 57 were "one nighters." The Tracking News counted a total of 68 listings on the NEOCP on this day.

New MPECs  on 25 January '12

Minor Planet Electronic Circulars

There were two MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2012-B60 - "22:41 UT" - 2010 ON101


<< DOU on 25 Jan. '12 >>  MPEC 2012-B59 - "06:04 UT" - Daily Orbit Update

Observers  on 25 January '12

Eighteen observers appeared in this day's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPEC 2012-B59 -- 2012 BV13, 2012 BB2, 2012 AY, 2012 AC3, 2012 AA11, 2011 YY62, 2011 YH6
I99Blanquita Obs. in Spain, 2 in MPEC 2012-B59 -- 2011 WV134, 2005 NJ1
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPEC 2012-B59 -- 2012 BZ13, 2012 BV13, 2012 BG14, 2012 BG11, 2012 BF14, 2012 BD14, 2012 AA3, 189008, 138127
J01Cielo Profundo Obs. in Spain, 1 in MPEC 2012-B59 -- 32906
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2012-B59 -- 433
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2012-B59 -- 2012 BX1
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-B59 -- 2012 BJ14
J95Great Shefford Obs. in England, 1 in MPEC 2012-B59 -- 2012 BY1
379Hamamatsu-Yuto Obs. in Japan, 3 in MPEC 2012-B59 -- 2011 SL102, 2008 WZ13, 1036
A24New Millennium Obs. in Italy, 23 in MPEC 2012-B59 -- 2011 YV15, 2011 SL102, 1996 AE2, 99799, 85839, 32906, 29075, 21088, 20826, 162186, 153951, 142348, 141018, 101873, 10145, 8567, 6050, 4183, 3103, 2201, 1866, 1627, 1620
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPECs 2012-B59 & 2012-B60 -- 2010 ON101, 2004 BH41, 281365
B49Paus Obs. in Spain, 1 in MPEC 2012-B59 -- 2012 BW13
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 7 in MPEC 2012-B59 -- 2011 XE1, 2008 WZ13, 2008 QY, 2006 VY13, 2005 NJ1, 138524, 4183
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2012-B59 -- 2012 BD27
204Schiaparelli Obs. in Italy, 9 in MPEC 2012-B59 -- 2012 BV26, 2012 BB2, 2012 AX, 2011 YW1, 2011 XO3, 2011 VW5, 2008 YT30, 2005 NJ1, 2002 AN11
645Sloan Digital Sky Survey (SDSS) in New Mexico, 9 in MPEC 2012-B59 -- 54690, 34613, 32906, 31221, 31210, 27346, 246138, 236716, 210012
J84South Obs. in England, 1 in MPEC 2012-B59 -- 2012 BY1
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2012-B59 & 2012-B60 -- 2011 YV62, 2010 ON101
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 January '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2030 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.
0000NNN000

Object

Risk
Monitor
When
Noted
UTC
0000T0000
Year
Range

VI
#
000NN00
Prob
Cum
T0000
PS
Cum
T0000
PS
Max

T
S


Notes for Today's Latest Risk Assessments
2012 BJ14JPL Sentry13252077-211132.6e-07-6.24-6.370JPL: "Analysis based on 24 observations spanning 3.9733 days (2012-Jan-20.51304 to 2012-Jan-24.486296)." Diameter approximately 0.044 km. from mean, weighted H=24.4.
NEODyS13252077-207736.22e-08-6.69-6.730NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2012-01-20.514 to 2012-01-24.487."
2012 BW13JPL Sentry13252072-211194.5e-06-6.65-6.970JPL: "Analysis based on 27 observations spanning 5.6870 days (2012-Jan-19.20743 to 2012-Jan-24.89438)." Diameter approximately 0.012 km. from mean, weighted H=27.2.
NEODyS13252072-209035.9e-08-8.35-8.370NEODyS: "Based on 27 optical observations (of which 0 are rejected as outliers) from 2012-01-19.208 to 2012-01-24.895."
2012 BY1JPL Sentry13252043-207474.3e-06-5.48-5.720JPL: "Analysis based on 43 observations spanning 5.7181 days (2012-Jan-18.39002 to 2012-Jan-24.108101)." Diameter approximately 0.024 km. from mean, weighted H=25.8.
NEODyS13252043-207482.22e-06-5.69-5.760NEODyS: "Based on 43 optical observations (of which 2 are rejected as outliers) from 2012-01-18.391 to 2012-01-24.109."
2011 YV62JPL Sentry13252078-208747.1e-08-5.17-5.200JPL: "Analysis based on 44 observations spanning 21.100 days (2011-Dec-30.23271 to 2012-Jan-20.332898)." Diameter approximately 0.210 km. from mean, weighted H=21.0.
NEODyS13252074-208036.52e-08-5.20-5.220NEODyS: "Based on 44 optical observations (of which 0 are rejected as outliers) from 2011-12-30.233 to 2012-01-20.334."

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 25 January '12

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

0017 1/26Grabbed MPEC 2012-B60 - 2010 ON101 - see above
1443Posted Traffic Report
1325Noted that JPL Sentry has updated its 2011 YV62 risk assessment - see above
Noted that NEODyS has updated its 2011 YV62 risk assessment - see above
Noted that JPL Sentry has updated its 2012 BJ14 risk assessment - see above
Noted that NEODyS has updated its 2012 BJ14 risk assessment - see above
Noted 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-B59 - Daily Orbit Update - see above