Contents  on 3 May '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 May '12

Four objects reported inside ten LD

Four asteroids are reported moving within ten lunar distances (LD) of Earth today. 2012 HA34 exits Earth's Hill sphere, traveling from 3.21 to 5.00 LD. Further away, radar target 2012 HM is outbound from 6.73 to 8.14 LD, risk-listed 2012 HE31 from 6.80 to 9.01 LD, and 1992 JD from perhaps 9.6 to 9.9 LD*.

Coming our way next, 2010 KK37 arrives inside ten LD on May 15th.

This report was generated at 1923 UTC with follow-up in today's DOU MPEC for 2012 HD25 and 2012 HG2.

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. Object distances are interpreted by A/CC from JPL Horizons data. "LD*" indicates some passage uncertainty. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 3 May '12

The MPC's NEO Confirmation Page has 1 listing

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one object listed. This was a "one nighter."

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 May '12

Minor Planet Electronic Circulars

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

MPEC 2012-J13 - "12:56 UT" - 2011 CO2

<< DOU on 3 May '12 >>  MPEC 2012-J12 - "06:04 UT" - Daily Orbit Update

Observers  on 3 May '12

Fifteen observers appear in today's MPECs.

CodeObserver / observatory
H21Astronomical Research Obs. Westfield in Illinois, 17 in MPEC 2012-J12 -- 2012 HZ33, 2012 HO, 2012 HN8, 2012 HN2, 2012 HN13, 2012 HM8, 2012 HL31, 2012 HL, 2012 HJ1, 2012 HH31, 2012 HG8, 2012 HG2, 2012 HD20, 2012 GK, 2012 FR62, 2012 DO, 2009 NH
703Catalina Sky Survey in Arizona, 1 in MPEC 2012-J12 -- 186823
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 8 in MPEC 2012-J12 -- 2012 HL31, 2012 HJ31, 2012 HD25, 2012 HB25, 2012 BZ76, 2011 YU62, 2011 XO3, 2011 WO4
821Cordoba Obs. Bosque Alegre Station in Argentina, 3 in MPEC 2012-J12 -- 2011 QD48, 2001 QD96, 101955
C73Galati Obs. in Romania, 4 in MPEC 2012-J12 -- 2012 HM8, 2012 HJ1, 2012 FY23, 2007 UB6
203GiaGa Obs. in Italy, 5 in MPEC 2012-J12 -- 2012 HZ33, 2012 HM8, 2012 HL, 86667, 141018
A17Guidestar Obs. in Germany, 5 in MPEC 2012-J12 -- 2012 HR2, 2012 HN2, 2012 HN13, 2012 HG8, 2011 YU62
704LINEAR in New Mexico, 3 in MPEC 2012-J12 -- 2011 WV134, 1998 HE3, 297274
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 1 in MPEC 2012-J12 -- 2009 WG54
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-J13 -- 2011 CO2
A13Naef Obs. in Switzerland, 2 in MPEC 2012-J12 -- 1998 HE3, 1994 NK
645Sloan Digital Sky Survey (SDSS) in New Mexico, 39 in MPEC 2012-J12 -- 2007 BE49, 2006 YF, 2005 VE7, 2005 SS4, 2005 SQ9, 2005 RD34, 2005 LD, 2005 EU95, 2005 BS27, 2005 BN1, 2004 US1, 2004 TD18, 2004 SB20, 2004 RX164, 2004 RU331, 2004 QZ1, 2004 HC2, 2004 BG11, 2003 UO25, 2003 SY17, 2003 SU84, 2002 TV55, 2002 RQ25, 2002 AK14, 2002 AC, 2001 UX4, 2001 SH276, 2001 QD96, 2001 FF90, 2000 TL1, 2000 SL10, 1999 VS6, 1997 WB21, 1994 XG, 1991 TF3, 1990 UO, 322705, 314079, 100004
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2012-J12 -- 2012 HJ1, 2002 GK8, 65909, 10636
291Spacewatch 1.8m telescope in Arizona, 17 in MPEC 2012-J12 -- 2012 HY33, 2012 HS15, 2012 HN13, 2012 HM8, 2012 HJ31, 2012 HH31, 2012 HG31, 2012 HG2, 2012 HD25, 2012 GX11, 2012 GS5, 2012 GK, 2012 GB5, 2010 SO16, 2010 KX7, 2010 JU39, 2008 OX2
2905Richard P. Boyle via Vatican Advanced Technology Telescope in Arizona, 1 in MPEC 2012-J12 -- 138911
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 3 May '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 HJ31JPL Sentry1658R E M O V E DJPL: Risk listing removed at 1032 UTC.
NEODyS1658R E M O V E D-
2012 HB25NEODyS16592023-209063.6e-05-3.85-3.870NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2012-04-24.354 to 2012-05-02.244."
JPL Sentry16582023-209073.6e-05-3.84-3.860JPL: "Analysis based on 25 observations spanning 7.8902 days (2012-Apr-24.35308 to 2012-May-02.24328)." Diameter approximately 0.037 km. from mean, weighted H=24.8.
2012 HG8JPL Sentry1658R E M O V E DJPL: Risk listing removed at 0953 UTC.
2012 HG2NEODyS17012053-20912341.06e-03-4.18-4.90NEODyS: "Based on 146 optical observations (of which 9 are rejected as outliers) from 2012-04-20.372 to 2012-05-02.307."
JPL Sentry16582053-2058134.4e-05-5.48-5.940JPL: "Analysis based on 146 observations spanning 11.935 days (2012-Apr-20.37147 to 2012-May-02.3064)." Diameter approximately 0.014 km. from mean, weighted H=27.0.

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 May '12

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

1923Generated Traffic Report
1701Noted that NEODyS has updated its 2012 HG2 risk assessment - see above
1659Noted that NEODyS has updated its 2012 HB25 risk assessment - see above
1658Noted that JPL Sentry has updated its 2012 HB25 risk assessment - see above
Noted that JPL Sentry has updated its 2012 HG2 risk assessment - see above
Noted that JPL Sentry has removed 2012 HG8 as an impact risk - see above
Noted that JPL Sentry has removed 2012 HJ31 as an impact risk - see above
Noted that NEODyS has removed 2012 HJ31 as an impact risk - see above
Grabbed MPEC 2012-J12 - Daily Orbit Update - see above
Grabbed MPEC 2012-J13 - 2011 CO2 - see above