Contents  on 1 March '12

Asteroid/Comet Connection (A/CC) Resources:

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 1 March '12

Eight objects reported inside ten LD

Eight asteroids are reported moving within ten lunar distances (LD) of our planet today. Inside Earth's Hill sphere, 2012 DS32 comes its closest to Earth this time around, reaching 1.87 LD at 0036 UTC, and newly discovered 2012 EA travels from 3.81 to 3.09 LD. Out further, risk-listed 2012 CS46 is calculated with great uncertainty to be headed away from 7.1 to 8.6 LD*, 2012 DN31 comes its closest to Earth on this passage -- 8.02 LD at 2139 UTC, and risk-listed 2012 DJ54 leaves ten LD, traveling from 8.97 to 10.18 LD. Meanwhile, 2012 DR32 comes inside ten LD, passing from 10.67 to 9.05 LD, newly announced 2012 DU60 comes within, traveling from 10.2 to 9.5 LD*, and 2012 DH54 also enters "the bubble," moving from 10.7 to 9.7 LD*.

Coming toward Earth, newly discovered and risk-listed 2012 DW60 and returning 2008 EJ85 come inside ten LD on March 4th.

This report was updated at 2228 UTC with new discoveries 2012 EA (MPEC), 2012 DW60 (MPEC), and 2012 DU60 (MPEC) and, earlier, follow-up in today's DOU MPEC for 2012 DR32, 2012 DN31, and 2012 DA14. This report was previously updated at 1605 UTC.


Notes: Ten times the distance to the Moon (ten LD) has no astronomical significance but is a useful reporting boundary. Earth's Hill sphere (of gravitational influence) is estimated to extend out to around 3.89 LD. Distances are interpreted by A/CC from JPL Horizons data. "LD*" indicates some passage uncertainty. See also today's timeline, current sky chart and object details (alt-details), and ephemerides.

NEOCP Activity  on 1 March '12

The MPC's NEO Confirmation Page has 13 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had thirteen objects listed. Of these, six were "one nighters." So far The Tracking News has counted a total of 44 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 1 March '12

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been twelve MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2012-E12 - "23:29 UT" - 2012 DJ61


MPEC 2012-E11 - "23:27 UT" - 2012 DH61


MPEC 2012-E10 - "23:24 UT" - 2012 DG61


MPEC 2012-E09 - "23:22 UT" - 2012 DF61


MPEC 2012-E08 - "23:20 UT" - 2012 DE61


MPEC 2012-E07 - "23:18 UT" - 2012 DD61


MPEC 2012-E06 - "20:30 UT" - 2012 EA


MPEC 2012-E05 - "18:58 UT" - 2012 DW60


MPEC 2012-E04 - "18:55 UT" - 2012 DV60


MPEC 2012-E03 - "18:52 UT" - 2012 DU60


MPEC 2012-E02 - "18:50 UT" - 2012 DT60


<< DOU on 1 Mar. '12 >>  MPEC 2012-E01 - "06:04 UT" - Daily Orbit Update

Observers  on 1 March '12

A total of 35 observers appear in today's MPECs.

CodeObserver / observatory
J94Abbeydale Obs. in England, 1 in MPEC 2012-E01 -- 1627
J16An Carraig Obs. in Northern Ireland, 1 in MPEC 2012-E09 -- 2012 DF61
J51Atlante Obs. in the Canary Islands, 2 in MPEC 2012-E01 -- 32906, 192642
C93Bellavista Obs. in Italy, 1 in MPEC 2012-E09 -- 2012 DF61
703Catalina Sky Survey (CSS) in Arizona, 14 in MPECs 2012-E01, 2012-E06 & 2012-E07 -- 2012 EA, 2012 DR32, 2012 DQ32, 2012 DD61, 2012 BJ134, 2006 VY13, 2002 AW, 85990, 53319, 311554, 163000, 6050, 3103, 1862
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPECs 2012-E01 & 2012-E07 -- 2012 DO8, 2012 DD61
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2012-E12 -- 2012 DJ61
G48Doc Greiner Research Obs. Rancho Hildalgo (DGRO-RH) in New Mexico, 3 in MPECs 2012-E01 & 2012-E09 -- 2012 DQ8, 2012 DN31, 2012 DF61
151Eschenberg Obs. in Switzerland, 4 in MPECs 2012-E01, 2012-E06 & 2012-E09 -- 2012 EA, 2012 DR32, 2012 DF61, 2012 BT23
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2012-E09 & 2012-E11 -- 2012 DH61, 2012 DF61
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-E08 -- 2012 DE61
F657Paul Roche in Wales via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-E07 -- 2012 DD61
J95Great Shefford Obs. in England, 5 in MPECs 2012-E02, 2012-E05, 2012-E09, 2012-E11 & 2012-E12 -- 2012 DW60, 2012 DT60, 2012 DJ61, 2012 DH61, 2012 DF61
704LINEAR in New Mexico, 5 in MPECs 2012-E01, 2012-E03 & 2012-E09 -- 2012 DU60, 2012 DF61, 310402, 21277, 4055
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 1 in MPEC 2012-E01 -- 2008 JQ14
J75La Sagra Obs. in Spain, 1 in MPEC 2012-E01 -- 2012 DA14
560Madonna di Dossobuono Obs. in Italy, 4 in MPEC 2012-E01 -- 2012 DN31, 2012 BT23, 2012 BJ134, 2011 SL102
H01Magdalena Ridge Obs. (MRO) in New Mexico, 6 in MPECs 2012-E02, 2012-E08, 2012-E09, 2012-E10, 2012-E11 & 2012-E12 -- 2012 DT60, 2012 DJ61, 2012 DH61, 2012 DG61, 2012 DF61, 2012 DE61
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-E08 -- 2012 DE61
B67Mirasteilas Obs. in Switzerland, 2 in MPEC 2012-E01 -- 2012 DQ32, 2012 DL31
C91Montevenere Obs., 3 in MPECs 2012-E01 & 2012-E09 -- 2012 DN31, 2012 DF61, 2012 BT23
900Moriyama Obs. in Japan, 1 in MPEC 2012-E09 -- 2012 DF61
G96Mt. Lemmon Survey (MLS) in Arizona, 12 in MPECs 2012-E01, 2012-E02, 2012-E03, 2012-E04, 2012-E07 & 2012-E09 -- 2012 DV60, 2012 DU60, 2012 DT60, 2012 DJ4, 2012 DF61, 2012 DD61, 1995 DW1, 99799, 68359, 27002, 172722, 4055
I89Nerpio Obs. in Italy, 1 in MPEC 2012-E01 -- 2012 DA14
A24New Millennium Obs. in Italy, 6 in MPECs 2012-E01, 2012-E02, 2012-E09, 2012-E10, 2012-E11 & 2012-E12 -- 2012 DT60, 2012 DJ61, 2012 DH61, 2012 DG61, 2012 DF61, 2012 DA14
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPECs 2012-E08, 2012-E10, 2012-E11 & 2012-E12 -- 2012 DJ61, 2012 DH61, 2012 DG61, 2012 DE61
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2012-E09 -- 2012 DF61
H36Sandlot Obs. in Kansas, 2 in MPECs 2012-E10 & 2012-E11 -- 2012 DH61, 2012 DG61
204Schiaparelli Obs. in Italy, 5 in MPECs 2012-E05, 2012-E09, 2012-E10, 2012-E11 & 2012-E12 -- 2012 DW60, 2012 DJ61, 2012 DH61, 2012 DG61, 2012 DF61
E12Siding Spring Survey (SSS) in New South Wales, 4 in MPEC 2012-E01 -- 2012 DK31, 2011 US63, 1995 FX, 1980
691Spacewatch 0.9m telescope in Arizona, 2 in MPEC 2012-E01 -- 2003 DE6, 312942
291Spacewatch 1.8m telescope in Arizona, 17 in MPECs 2012-E01, 2012-E02, 2012-E04, 2012-E05, 2012-E08, 2012-E09, 2012-E10, 2012-E11 & 2012-E12 -- 2012 DZ32, 2012 DW60, 2012 DV60, 2012 DT60, 2012 DN, 2012 DJ61, 2012 DH61, 2012 DG61, 2012 DF61, 2012 DE61, 2012 DA33, 2012 DA14, 2012 CL19, 2012 BJ86, 2012 BB124, 2010 LN14, 2010 DO
I93St. Pardon de Conques Obs. in France, 4 in MPECs 2012-E06, 2012-E09, 2012-E10 & 2012-E12 -- 2012 EA, 2012 DJ61, 2012 DG61, 2012 DF61
A78Stia Obs. in Italy, 2 in MPEC 2012-E01 -- 2011 SL102, 101873
C92Valdicerro Obs. in Italy, 1 in MPEC 2012-E09 -- 2012 DF61
C44Volta Obs. in Italy, 4 in MPECs 2012-E02, 2012-E09, 2012-E10 & 2012-E11 -- 2012 DT60, 2012 DH61, 2012 DG61, 2012 DF61
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 March '12

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2358 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 DW60JPL Sentry22012059-21112362.0e-05-5.70-6.920JPL: "Analysis based on 17 observations spanning .95487 days (2012-Feb-29.49427 to 2012-Mar-01.44914)." Diameter approximately 0.019 km. from mean, weighted H=26.3.
2012 DJ54NEODyS16032064-2090132.86e-05-6.58-6.630NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2012-02-27.469 to 2012-02-29.717."
2012 DZ32JPL Sentry1603R E M O V E DJPL: Risk listing removed at 0848 UTC.
2012 DA14JPL Sentry16032020-2042267.0e-05-3.57-4.020JPL: "Analysis based on 73 observations spanning 7.0627 days (2012-Feb-23.03431 to 2012-Mar-01.09702)." Diameter approximately 0.044 km. from mean, weighted H=24.4.
NEODyS16032020-20903633.25e-04-3.19-3.990NEODyS: "Based on 58 optical observations (of which 3 are rejected as outliers) from 2012-02-23.029 to 2012-02-29.086."
2012 BJ86JPL Sentry1603211216.1e-08-5.75-5.750JPL: "Analysis based on 68 observations spanning 31.192 days (2012-Jan-29.10142 to 2012-Feb-29.29359)." Diameter approximately 0.160 km. from mean, weighted H=21.6.
NEODyS16032090-209014.31e-08-5.83-5.830NEODyS: "Based on 60 optical observations (of which 0 are rejected as outliers) from 2012-01-29.102 to 2012-02-29.294."

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 1 March '12

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

2358Grabbed MPEC 2012-E07 - 2012 DD61 - see above
Grabbed MPEC 2012-E08 - 2012 DE61 - see above
Grabbed MPEC 2012-E09 - 2012 DF61 - see above
Grabbed MPEC 2012-E10 - 2012 DG61 - see above
Grabbed MPEC 2012-E11 - 2012 DH61 - see above
Grabbed MPEC 2012-E12 - 2012 DJ61 - see above
2228Updated Traffic Report
2201Noted that JPL Sentry has posted 2012 DW60 as an impact risk - see above
2105Grabbed MPEC 2012-E02 - 2012 DT60 - see above
Grabbed MPEC 2012-E03 - 2012 DU60 - see above
Grabbed MPEC 2012-E04 - 2012 DV60 - see above
Grabbed MPEC 2012-E05 - 2012 DW60 - see above
Grabbed MPEC 2012-E06 - 2012 EA - see above
1603Noted that JPL Sentry has updated its 2012 BJ86 risk assessment - see above
Noted that NEODyS has updated its 2012 BJ86 risk assessment - see above
Noted that JPL Sentry has updated its 2012 DA14 risk assessment - see above
Noted that NEODyS has updated its 2012 DA14 risk assessment - see above
Noted that NEODyS has posted 2012 DJ54 as an impact risk - see above
Noted that JPL Sentry has removed 2012 DZ32 as an impact risk - see above
Grabbed MPEC 2012-E01 - Daily Orbit Update - see above