Contents  on 23 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 23 January '12

Four objects reported inside ten LD

There are four asteroids reported flying within ten lunar distances (LD) of our planet today. Risk-listed 2012 BY1 enters Earth's Hill sphere and 2012 BS1 comes its closest to Earth this time around, reaching 3.12 LD at 2129 UTC. Intruder 2012 BV1 moves outward from 5.25 to 7.15 LD and risk-listed 2012 BW13 comes inward from 8.79 to 6.21 LD.

Approaching our neighborhood, 2012 BD14 arrives inside ten LD on January 25th and radar target 2011 CP4 comes inside on February 22nd.

This report was updated at 1615 UTC with follow-up in today's DOU MPEC for 2012 BD14, 2012 BW13, 2012 BO11, 2012 BS1, and 2011 YH40.

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 23 January '12

The MPC's NEO Confirmation Page has 11 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had eleven objects listed. Of these, four were "one nighters." So far The Tracking News has counted a total of 22 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 23 January '12

Minor Planet Electronic Circulars

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

MPEC 2012-B54 - "23:24 UT" - 2012 BV26

MPEC 2012-B53 - "12:54 UT" - 2012 BT23

MPEC 2012-B52 - "12:52 UT" - 2012 BS23

MPEC 2012-B51 - "12:40 UT" - 2012 BR23

<< DOU on 23 Jan. '12 >>  MPEC 2012-B50 - "06:04 UT" - Daily Orbit Update

Observers  on 23 January '12

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

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 1 in MPEC 2012-B53 -- 2012 BT23
160Castelmartini Obs. in Italy, 11 in MPEC 2012-B50 -- 2012 AE1, 2011 YV15, 2011 XO3, 2011 XE1, 2011 WV134, 2008 WZ13, 2008 QY, 2003 AF23, 310842, 310442, 263976
703Catalina Sky Survey (CSS) in Arizona, 2 in MPECs 2012-B50 & 2012-B53 -- 2012 BT23, 2012 BS1
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 15 in MPECs 2012-B50 & 2012-B53 -- 2012 BW13, 2012 BV13, 2012 BT23, 2012 BO11, 2012 BN11, 2012 BG11, 2012 BF14, 2012 BD14, 2012 BB2, 2012 BB14, 2012 AU10, 2011 YM63, 2011 YJ28, 2011 YH40, 2009 AK15
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2012-B53 -- 2012 BT23
J19El Maestrat Obs. in Spain, 1 in MPEC 2012-B50 -- 4183
F65$Ernesto Guido in Italy via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-B54 -- 2012 BV26
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-B54 -- 2012 BV26
J95Great Shefford Obs. in England, 3 in MPECs 2012-B51, 2012-B52 & 2012-B54 -- 2012 BV26, 2012 BS23, 2012 BR23
695{Tomas Vorobjov in England via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2012-B51 -- 2012 BR23
704LINEAR in New Mexico, 4 in MPEC 2012-B50 -- 283729, 192642, 3103, 1943
844Los Molinos Obs. in Uruguay, 1 in MPEC 2012-B50 -- 141056
130Lumezzane Obs. in Italy, 7 in MPEC 2012-B50 -- 2012 AY, 2011 YV15, 1996 AE2, 32906, 308127, 275714, 192642
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2012-B51 & 2012-B52 -- 2012 BS23, 2012 BR23
G96Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2012-B51 & 2012-B52 -- 2012 BS23, 2012 BR23
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2012-B50 -- 154302
A24New Millennium Obs. in Italy, 8 in MPEC 2012-B50 -- 24475, 209924, 20826, 16816, 7358, 4183, 2201, 1866
F51Pan-STARRS 1 (PS1) in Hawaii, 10 in MPECs 2012-B50 & 2012-B54 -- 2012 BV26, 2011 YV15, 2002 AX1, 21088, 163000, 152941, 137925, 4183, 3352, 2368
B49Paus Obs. in Spain, 1 in MPEC 2012-B50 -- 2012 AE1
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2012-B53 -- 2012 BT23
I20Rio Cuarto Obs. in Argentina, 1 in MPEC 2012-B53 -- 2012 BT23
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2012-B52 -- 2012 BS23
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2012-B50 & 2012-B52 -- 2012 BS23, 2012 BS1
C92Valdicerro Obs. in Italy, 1 in MPEC 2012-B53 -- 2012 BT23
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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 BK14NEODyS13552014-20911502.18e-06-7.03-7.970NEODyS: "Based on 11 optical observations (of which 2 are rejected as outliers) from 2012-01-21.318 to 2012-01-21.466."
2012 BB14JPL Sentry1355R E M O V E DJPL: Risk listing removed at 0852 UTC.
2012 BW13JPL Sentry13552079-2111118.7e-06-6.32-6.450JPL: "Analysis based on 20 observations spanning 3.9207 days (2012-Jan-19.20743 to 2012-Jan-23.12816)." Diameter approximately 0.013 km. from mean, weighted H=27.1.
NEODyS13552072-208867.12e-07-7.29-7.480NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2012-01-19.208 to 2012-01-23.129."
2012 BO11NEODyS13552067-207623.02e-08-8.02-8.190NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2012-01-19.493 to 2012-01-22.283."

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 23 January '12

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

2359Grabbed MPEC 2012-B54 - 2012 BV26 - see above
1615Posted Traffic Report
1355Noted that JPL Sentry has removed 2012 BB14 as an impact risk - see above
Noted that NEODyS has posted 2012 BK14 as an impact risk - see above
Noted that NEODyS has updated its 2012 BO11 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
Grabbed MPEC 2012-B50 - Daily Orbit Update - see above
Grabbed MPEC 2012-B51 - 2012 BR23 - see above
Grabbed MPEC 2012-B52 - 2012 BS23 - see above
Grabbed MPEC 2012-B53 - 2012 BT23 - see above