Contents  on 3 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 3 March '12

Seven objects reported inside ten LD

Seven objects are reported passing inside ten lunar distances (LD) of Earth today. Within Earth's Hill sphere, 2012 EA comes its closest to Earth on this passage, reaching 2.63 LD at 0952 UTC. Further away, 2012 DS32 is departing, moving from 4.52 to 6.48 LD, 2012 DH54 travels from 8.6 to 7.6 LD*, 2012 DN31 is heading out from 8.24 to 8.79 LD, newly discovered 2012 EM1 comes in from 9.47 to 8.68 LD, 2012 DR32 goes from 8.75 to 9.88 LD, and 2012 DU60 gets its closest to Earth on this passage: 9.09 LD at 1114 UTC.

Coming toward Earth, risk-listed radar target 2012 DW60 arrives within ten LD tomorrow, as is also calculated with some uncertainty for returning 2008 EJ85, and 2007 HV4 comes inside on April 14th.

Update at 2357 UTC: At day's end, JPL has not yet posted an orbit solution for 2012 EZ1 (see below), which the Minor Planet Center MPES is reporting flew past Earth at less than a lunar distance on March 1st, based on a 2.49-hour observation span. Earlier we reported new discovery 2012 EM1 (MPEC) and follow-up in today's DOU MPEC for 2012 DW60, 2012 DU60, 2012 DJ54, 2012 DH54, 2012 DN31, and 2012 DA14. This report was previously updated at 0515, 1631, and 1821 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 3 March '12

The MPC's NEO Confirmation Page has 6 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had six objects listed. Of these, one was a "one nighter." So far The Tracking News has counted a total of sixteen 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 3 March '12

Minor Planet Electronic Circulars

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


MPEC 2012-E28 - "20:59 UT" - 2012 EB2


MPEC 2012-E27 - "20:57 UT" - 2012 EA2


MPEC 2012-E26 - "19:19 UT" - 2012 EZ1


MPEC 2012-E25 - "12:14 UT" - 2012 EM1


MPEC 2012-E24 - "12:11 UT" - 2012 EL1


MPEC 2012-E23 - "12:09 UT" - 2012 EK1


MPEC 2012-E22 - "12:07 UT" - 2012 EJ1


MPEC 2012-E21 - "11:51 UT" - 2012 DX75


<< DOU on 3 Mar. '12 >>  MPEC 2012-E20 - "06:07 UT" - Daily Orbit Update


MPEC 2012-E19 - "03:49 UT" - 2008 CS1

Observers  on 3 March '12

A total of 32 observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 7 in MPECs 2012-E19, 2012-E20, 2012-E21 & 2012-E27 -- 2012 EA2, 2012 DX75, 2012 DK31, 2012 DH54, 2012 CA21, 2012 AA11, 2008 CS1
C93Bellavista Obs. in Italy, 1 in MPEC 2012-E21 -- 2012 DX75
B75Betelgeuse Station in Italy, 4 in MPEC 2012-E20 -- 2012 DN31, 2012 CD29, 2012 BJ134, 2012 BC20
B88Bigmuskie Obs. in Italy, 1 in MPEC 2012-E20 -- 2012 EB
703Catalina Sky Survey (CSS) in Arizona, 11 in MPECs 2012-E20, 2012-E21, 2012-E23, 2012-E24 & 2012-E26 -- 2012 EZ1, 2012 EL1, 2012 EK1, 2012 DX75, 2012 CP36, 2012 CC17, 32906, 171819, 162038, 5620, 4055
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. in Chile, 1 in MPEC 2012-E23 -- 2012 EK1
G48Doc Greiner Research Obs. Rancho Hildalgo in New Mexico, 1 in MPEC 2012-E20 -- 2012 DF61
595Farra d'Isonzo Obs. in Italy, 2 in MPECs 2012-E21 & 2012-E25 -- 2012 EM1, 2012 DX75
F65%Tim Lister in southern California via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-E20 -- 2012 DG61
203GiaGa Obs. in Italy, 4 in MPECs 2012-E20 & 2012-E25 -- 2012 EM1, 2012 EB, 2012 DF61, 275558
J95Great Shefford Obs. in England, 2 in MPECs 2012-E27 & 2012-E28 -- 2012 EB2, 2012 EA2
695{Tomas Vorobjov in England via Kitt Peak Natl. Obs. in Arizona, 1 in MPEC 2012-E21 -- 2012 DX75
704LINEAR in New Mexico, 5 in MPEC 2012-E20 -- 2008 PF1, 2006 VY13, 85990, 9400, 1862
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 1 in MPEC 2012-E19 -- 2008 CS1
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2012-E21 -- 2012 DX75
5682David Tholen's team on Mauna Kea in Hawaii, 2 in MPEC 2012-E20 -- 2012 DY43, 2012 DX43
118Modra Obs. in Slovakia, 1 in MPEC 2012-E19 -- 2008 CS1
C91Montevenere Obs., 1 in MPEC 2012-E20 -- 2012 DN31
G84Mt. Lemmon SkyCenter in Arizona, 1 in MPEC 2012-E21 -- 2012 DX75
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2012-E19, 2012-E20, 2012-E22, 2012-E23, 2012-E24, 2012-E25, 2012-E27 & 2012-E28 -- 2012 EM1, 2012 EL1, 2012 EK1, 2012 EJ1, 2012 EB2, 2012 EA2, 2008 CS1, 2008 BX2, 68063
A24New Millennium Obs. in Italy, 23 in MPECs 2012-E20 & 2012-E21 -- 2012 EB, 2012 DX75, 2012 BT23, 2012 BC124, 2011 SL102, 85839, 32906, 313548, 275558, 21088, 163000, 162186, 162038, 154269, 153951, 143651, 142348, 141018, 138524, 138013, 101873, 6050, 3103
F51Pan-STARRS 1 (PS1) in Hawaii, 3 in MPEC 2012-E20 -- 2012 DJ61, 2011 EB12, 312942
D90`Kevin Hills in England via RAS Obs. Moorook in South Australia, 2 in MPEC 2012-E20 -- 2012 DU60, 2012 DK61
854Sabino Canyon Obs. in Arizona, 4 in MPECs 2012-E21, 2012-E23, 2012-E24 & 2012-E25 -- 2012 EM1, 2012 EL1, 2012 EK1, 2012 DX75
B04Saint-Barthelemy Obs. in Italy, 4 in MPECs 2012-E20 & 2012-E25 -- 2012 EM1, 2012 DA14, 99942, 175706
H36Sandlot Obs. in Kansas, 1 in MPEC 2012-E19 -- 2008 CS1
204Schiaparelli Obs. in Italy, 4 in MPECs 2012-E20, 2012-E21 & 2012-E25 -- 2012 EM1, 2012 DX75, 2012 DA14, 2011 EB12
691Spacewatch 0.9m telescope in Arizona, 6 in MPEC 2012-E20 -- 2012 DK61, 2004 QZ2, 1998 KN3, 96631, 267221, 153814
291Spacewatch 1.8m telescope in Arizona, 16 in MPECs 2012-E19, 2012-E20, 2012-E21 & 2012-E28 -- 2012 EB2, 2012 DY43, 2012 DX75, 2012 DX43, 2012 DX32, 2012 DW60, 2012 DV43, 2012 DK61, 2012 DJ61, 2012 DJ54, 2012 CA21, 2010 KY127, 2009 CS, 2008 YU32, 2008 NU, 2008 CS1
I93St. Pardon de Conques Obs. in France, 1 in MPEC 2012-E21 -- 2012 DX75
A78Stia Obs. in Italy, 2 in MPEC 2012-E20 -- 2012 DF61, 2012 BT23
C92Valdicerro Obs. in Italy, 1 in MPEC 2012-E21 -- 2012 DX75
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 March '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.
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 EB2JPL Sentry23592039-209172.3e-07-6.49-7.000JPL: "Analysis based on 12 observations spanning .56979 days (2012-Mar-03.2835 to 2012-Mar-03.85329)." Diameter approximately 0.042 km. from mean, weighted H=24.5.
2012 ECNEODyS16272061-2086103.86e-07-6.08-6.490NEODyS: "Based on 10 optical observations (of which 0 are rejected as outliers) from 2012-03-01.343 to 2012-03-02.411."
2012 DG61JPL Sentry16272034-210141.8e-09-5.14-5.540JPL: "Analysis based on 29 observations spanning 2.9333 days (2012-Feb-28.32729 to 2012-Mar-02.260629)." Diameter approximately 1.099 km. from mean, weighted H=17.5.
2012 DW60JPL Sentry16272069-21111552.9e-04-4.53-5.050JPL: "Analysis based on 20 observations spanning 1.9912 days (2012-Feb-29.49427 to 2012-Mar-02.48544)." Diameter approximately 0.019 km. from mean, weighted H=26.3.
NEODyS16272067-2090491.21e-04-4.87-5.110NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2012-02-29.495 to 2012-03-02.486."
2012 DJ54JPL Sentry16272068-2111211.0e-04-6.10-6.360JPL: "Analysis based on 17 observations spanning 3.8078 days (2012-Feb-27.46779 to 2012-Mar-02.27559)." Diameter approximately 0.006 km. from mean, weighted H=28.7.
NEODyS16272068-208655.17e-05-6.32-6.370NEODyS: "Based on 17 optical observations (of which 0 are rejected as outliers) from 2012-02-27.469 to 2012-03-02.276."
2012 DA14JPL Sentry16272020-20571182.2e-04-3.29-4.010JPL: "Analysis based on 88 observations spanning 8.9236 days (2012-Feb-23.03431 to 2012-Mar-02.95795)." Diameter approximately 0.044 km. from mean, weighted H=24.4.
NEODyS16272020-20903343.82e-04-3.16-3.980NEODyS: "Based on 85 optical observations (of which 3 are rejected as outliers) from 2012-02-23.029 to 2012-03-01.493."
2012 CA21JPL Sentry1627R E M O V E DJPL: Risk listing removed at 1050 UTC.

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 3 March '12

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

2359Noted that JPL Sentry has posted 2012 EB2 as an impact risk - see above
2357Updated Traffic Report
2201Grabbed MPEC 2012-E28 - 2012 EB2 - see above
2100Grabbed MPEC 2012-E27 - 2012 EA2 - see above
2000Grabbed MPEC 2012-E26 - 2012 EZ1 - see above
1629Grabbed MPEC 2012-E20 - Daily Orbit Update - see above
1627Noted that JPL Sentry has removed 2012 CA21 as an impact risk - 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 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 EC as an impact risk - see above
Grabbed MPEC 2012-E21 - 2012 DX75 - see above
Grabbed MPEC 2012-E22 - 2012 EJ1 - see above
Grabbed MPEC 2012-E23 - 2012 EK1 - see above
Grabbed MPEC 2012-E24 - 2012 EL1 - see above
Grabbed MPEC 2012-E25 - 2012 EM1 - see above
0508Grabbed MPEC 2012-E19 - 2008 CS1 - see above