Contents  on 4 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 4 March '12

Ten objects reported inside ten LD

Ten asteroids are reported traveling inside ten lunar distances (LD) of our planet today. Within Earth's Hill sphere, 2012 EA is heading out from 2.71 to 3.19 LD. More distant, 2012 DS32 is departing, moving from 6.48 to 8.50 LD, radar target 2012 DH54 travels from 7.62 to 6.66 LD, newly discovered intruder 2012 EZ1 is preliminarily calculated to leave ten LD, passing from 8.1 to 11.2 LD*, while 2012 EM1 flies from 8.68 to 8.08 LD, 2012 DN31 from 8.79 to 9.62 LD, and 2012 DU60 from 9.14 to 9.52 LD. Returning 2008 EJ85 comes inside ten LD, traveling from 10.1 to 9.6 LD*, as does risk-listed radar target 2012 DW60, moving from 11.13 to 9.90 LD, and 2012 DR32 exits, going from 9.88 to 12.05 LD.

The next known arrival is 2007 HV4, which comes inside ten LD on April 14th.

This report was updated at 1825 UTC to note that JPL has posted the Minor Planet Center's orbit solution for 2012 EA, the discovery of which was announced yesterday based on a very short discovery arc. We updated earlier with follow-up in today's DOU MPEC for 2012 EA, 2012 DW60, 2012 DJ54, 2012 DH54, 2012 DN31, and 2012 DA14. This report was previously updated at 1616 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 4 March '12

The MPC's NEO Confirmation Page has 5 listings

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had five objects listed. Of these, two were "one nighters." So far The Tracking News has counted a total of eight 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 4 March '12

Minor Planet Electronic Circulars

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


MPEC 2012-E32 - "21:38 UT" - 2012 EP3


MPEC 2012-E31 - "21:36 UT" - 2012 EO3


MPEC 2012-E30 - "21:28 UT" - 2012 EN3


<< DOU on 4 Mar. '12 >>  MPEC 2012-E29 - "06:06 UT" - Daily Orbit Update

Observers  on 4 March '12

A total of 26 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 3 in MPECs 2012-E30, 2012-E31 & 2012-E32 -- 2012 EP3, 2012 EO3, 2012 EN3
J51Atlante Obs. in the Canary Islands, 2 in MPEC 2012-E29 -- 24475, 3103
703Catalina Sky Survey (CSS) in Arizona, 8 in MPECs 2012-E29 & 2012-E30 -- 2012 EN3, 2012 DQ8, 2012 CD29, 2004 QJ7, 1998 KN3, 155334, 6053, 5587
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPEC 2012-E29 -- 2012 DU30, 2012 DP32, 2012 DG31, 2012 AT22
970Chelmsford Obs. in England, 1 in MPEC 2012-E31 -- 2012 EO3
850Cordell-Lorenz Obs. in Tennessee, 2 in MPECs 2012-E30 & 2012-E31 -- 2012 EO3, 2012 EN3
106Crni Vrh Obs. in Slovenia, 1 in MPEC 2012-E29 -- 2004 QJ7
734Farpoint Obs. in Kansas, 1 in MPEC 2012-E31 -- 2012 EO3
J95Great Shefford Obs. in England, 3 in MPECs 2012-E29, 2012-E30 & 2012-E31 -- 2012 EO3, 2012 EN3, 2012 EA
H15ISON-NM Obs. in New Mexico, 1 in MPEC 2012-E29 -- 2012 DA14
682Kanab Obs. in Utah, 1 in MPEC 2012-E29 -- 2012 DX75
704LINEAR in New Mexico, 1 in MPEC 2012-E29 -- 275792
J75La Sagra Obs. in Spain, 1 in MPEC 2012-E29 -- 2012 DA14
I48MPC code I48, 1 in MPEC 2012-E30 -- 2012 EN3
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-E29 -- 2012 DJ54
G96Mt. Lemmon Survey (MLS) in Arizona, 5 in MPECs 2012-E29, 2012-E31 & 2012-E32 -- 2012 EP3, 2012 EO3, 2012 BK77, 2012 BJ134, 7753
F51Pan-STARRS 1 in Hawaii, 1 in MPEC 2012-E29 -- 66407
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 8 in MPEC 2012-E29 -- 2012 DN31, 2012 BC20, 2011 YV15, 2010 SV3, 2006 VY13, 263976, 6455, 3554
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 1 in MPEC 2012-E30 -- 2012 EN3
J41Raheny Obs. in Ireland, 1 in MPEC 2012-E31 -- 2012 EO3
854Sabino Canyon Obs. in Arizona, 2 in MPECs 2012-E30 & 2012-E31 -- 2012 EO3, 2012 EN3
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-E30 -- 2012 EN3
204Schiaparelli Obs. in Italy, 3 in MPEC 2012-E29 -- 2012 DZ32, 2012 DW60, 2012 DK61
J84South Obs. in England, 1 in MPEC 2012-E29 -- 2012 DN31
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2012-E29 -- 2002 CW46, 32906, 267221, 5324
291Spacewatch 1.8m telescope in Arizona, 23 in MPECs 2012-E29, 2012-E30 & 2012-E31 -- 2012 EO3, 2012 EN3, 2012 EC, 2012 DY43, 2012 DX75, 2012 DW60, 2012 DV32, 2012 DT32, 2012 DP8, 2012 DO8, 2012 DN, 2012 DL31, 2012 DK61, 2012 DJ4, 2012 DH54, 2012 DG61, 2012 CQ36, 2012 CP36, 2012 CM29, 2012 CL29, 2012 CA55, 2010 LR33, 2009 WG54
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 4 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 EB2NEODyS16152039-206852.76e-07-6.42-6.890NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2012-03-03.284 to 2012-03-03.854."
2012 ECJPL Sentry16152033-2109861.9e-06-5.30-5.570JPL: "Analysis based on 13 observations spanning 1.9806 days (2012-Mar-01.3419 to 2012-Mar-03.32252)." Diameter approximately 0.064 km. from mean, weighted H=23.6.
NEODyS16152030-208485.76e-08-6.51-6.590NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2012-03-01.343 to 2012-03-03.323."
2012 DG61JPL Sentry16152083-208926.9e-09-4.65-4.840JPL: "Analysis based on 32 observations spanning 3.9657 days (2012-Feb-28.32729 to 2012-Mar-03.29301)." Diameter approximately 1.100 km. from mean, weighted H=17.4.
2012 DW60JPL Sentry16152069-207878.4e-06-5.97-6.170JPL: "Analysis based on 25 observations spanning 2.9410 days (2012-Feb-29.49427 to 2012-Mar-03.4353)." Diameter approximately 0.019 km. from mean, weighted H=26.3.
NEODyS16152069-2090421.8e-04-4.72-4.950NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2012-02-29.495 to 2012-03-03.436."
2012 DJ54JPL Sentry16152068-2102101.0e-04-6.04-6.290JPL: "Analysis based on 23 observations spanning 3.8078 days (2012-Feb-27.46779 to 2012-Mar-02.27559)." Diameter approximately 0.007 km. from mean, weighted H=28.6.
NEODyS16152068-208655.31e-05-6.24-6.290NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2012-02-27.469 to 2012-03-02.276."
2012 DA14JPL Sentry16152020-20571192.2e-04-3.29-4.010JPL: "Analysis based on 93 observations spanning 10.166 days (2012-Feb-23.03431 to 2012-Mar-04.200111)." Diameter approximately 0.044 km. from mean, weighted H=24.4.
NEODyS16152020-20903403.61e-04-3.16-3.920NEODyS: "Based on 91 optical observations (of which 3 are rejected as outliers) from 2012-02-23.029 to 2012-03-02.959."

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 4 March '12

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

2202Grabbed MPEC 2012-E30 - 2012 EN3 - see above
Grabbed MPEC 2012-E31 - 2012 EO3 - see above
Grabbed MPEC 2012-E32 - 2012 EP3 - see above
1825Updated Traffic Report
1615Noted 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 JPL Sentry has updated its 2012 DG61 risk assessment - see above
Noted that JPL Sentry has updated its 2012 DJ54 risk assessment - see above
Noted that NEODyS has updated its 2012 DJ54 risk assessment - see above
Noted that JPL Sentry has updated its 2012 DW60 risk assessment - see above
Noted that NEODyS has updated its 2012 DW60 risk assessment - see above
Noted that NEODyS has posted 2012 EB2 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 EC risk assessment - see above
Noted that NEODyS has updated its 2012 EC risk assessment - see above
Grabbed MPEC 2012-E29 - Daily Orbit Update - see above