Contents  on 1 May '12

Note: These A/CC news pages will update infrequently through Thursday, May 3rd, possibly less than daily.

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 May '12

Four objects reported inside ten LD

Four visitors are reported moving within ten lunar distances (LD) of our planet today. Risk-listed 2012 HE31 exits Earth's Hill sphere, passing from 3.12 to 4.74 LD, and newly discovered 2012 HA34 enters the sphere, going from 4.84 to 3.12 LD.

Further away, radar target 2012 HM is outbound from 3.97 to 5.33 LD and unreported 1992 JD is inbound from 9.7 to 9.5 LD*.

Coming toward Earth next, 2010 KK37 arrives inside ten LD on May 15th.

This report was generated at 2320 UTC with new discovery 2012 HA34 (MPEC) and follow-up in today's DOU MPEC for 2012 HD25 and 2012 HG2, plus 2004 observation of currently distant 2011 LT17.

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 1 May '12

The MPC's NEO Confirmation Page has 5 listings

When last checked at 2359 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 1 May '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-J05 - "18:32 UT" - 2006 FZ51

MPEC 2012-J04 - "16:04 UT" - 2008 CB22

<< DOU on 1 May '12 >>  MPEC 2012-J03 - "06:03 UT" - Daily Orbit Update

MPEC 2012-J02 - "01:27 UT" - 2012 HA34

MPEC 2012-J01 - "01:25 UT" - 2012 HZ33

Observers  on 1 May '12

A total of 22 observers appear in today's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2012-J01 -- 2012 HZ33
300Bisei Spaceguard Center in Japan, 1 in MPEC 2012-J01 -- 2012 HZ33
160Castelmartini Obs. in Italy, 9 in MPEC 2012-J03 -- 2012 HL, 2006 VY13, 2004 FF29, 2003 WH166, 1994 NK, 86667, 186823, 141531, 141018
703Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2012-J01, 2012-J02 & 2012-J03 -- 2012 HZ33, 2012 HA34, 2011 YV15, 186823, 152754, 143947, 9400
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 2 in MPEC 2012-J03 -- 2012 HR2, 2012 HN13
448Desert Moon Obs. in New Mexico, 4 in MPEC 2012-J03 -- 2012 HO15, 2012 HD20, 2012 HC20, 302830
I48El Catalejo Obs., 2 in MPEC 2012-J03 -- 308242, 242450
595Farra d'Isonzo Obs. in Italy, 1 in MPEC 2012-J01 -- 2012 HZ33
C73Galati Obs. in Romania, 1 in MPEC 2012-J01 -- 2012 HZ33
704LINEAR in New Mexico, 9 in MPEC 2012-J03 -- 2012 HJ1, 2004 FF29, 2003 WH166, 1998 HE3, 86667, 312473, 297274, 154007, 6455
950.Ovidiu Vaduvescu via La Palma in the Canary Islands, 3 in MPEC 2012-J03 -- 2011 WV95, 2011 WQ46, 2011 UH21
130Lumezzane Obs. in Italy, 6 in MPEC 2012-J03 -- 2012 DO, 2004 FF29, 1998 HE3, 1994 NK, 317643, 138095
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-J04 -- 2008 CB22
G96Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2012-J01 & 2012-J03 -- 2012 HZ33, 137158, 5836
H45Petit Jean Mtn. South Obs. (PJMSO) in Arkansas, 6 in MPEC 2012-J03 -- 2012 HJ1, 2012 DO, 2006 VY13, 2004 VB, 1998 HE3, 1994 NK
H06.Cristovao Jacques in Brazil via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-J02 -- 2012 HA34
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-J05 -- 2006 FZ51
510Siegen Obs. in Germany, 1 in MPEC 2012-J03 -- 141018
645Sloan Digital Sky Survey (SDSS) in New Mexico, 13 in MPEC 2012-J03 -- 2011 XE, 2011 XC, 2011 UU20, 2011 LT17, 2006 WO3, 162566, 162273, 159923, 106589, 3988, 3908, 1580, 1221
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2012-J03 -- 2007 UB6
291Spacewatch 1.8m telescope in Arizona, 15 in MPEC 2012-J03 -- 2012 HY1, 2012 HO13, 2012 HM8, 2012 HM1, 2012 HJ31, 2012 HH31, 2012 HG8, 2012 HG31, 2012 HG2, 2012 HD25, 2012 HD20, 2012 GV17, 2012 GV11, 2010 KX7, 2007 RT147
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2012-J01 & 2012-J02 -- 2012 HZ33, 2012 HA34
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 1 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 Sentry1910208811.5e-08-7.65-7.650JPL: "Analysis based on 12 observations spanning 2.9514 days (2012-Apr-28.28455 to 2012-May-01.23598)." Diameter approximately 0.047 km. from mean, weighted H=24.3.
NEODyS19102088-208812.41e-08-7.45-7.450NEODyS: "Based on 12 optical observations (of which 0 are rejected as outliers) from 2012-04-28.285 to 2012-05-01.237."
2012 HG8JPL Sentry1910203014.0e-09-5.14-5.140JPL: "Analysis based on 145 observations spanning 10.965 days (2012-Apr-20.25484 to 2012-May-01.22003)." Diameter approximately 0.370 km. from mean, weighted H=19.8.
2012 HG2JPL Sentry19102053-2060231.2e-04-5.05-5.770JPL: "Analysis based on 132 observations spanning 9.9386 days (2012-Apr-20.37147 to 2012-Apr-30.31012)." Diameter approximately 0.014 km. from mean, weighted H=27.0.
NEODyS19102053-20912491.01e-03-4.20-4.930NEODyS: "Based on 132 optical observations (of which 9 are rejected as outliers) from 2012-04-20.372 to 2012-04-30.311."
2011 LT17NEODyS1910R E M O V E D-

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 May '12

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

2320Generated Traffic Report
1910Noted that NEODyS has removed 2011 LT17 as an impact risk - see above
Noted that JPL Sentry has updated its 2012 HG2 risk assessment - see above
Noted that NEODyS has updated its 2012 HG2 risk assessment - see above
Noted that JPL Sentry has updated its 2012 HG8 risk assessment - see above
Noted that JPL Sentry has updated its 2012 HJ31 risk assessment - see above
Noted that NEODyS has updated its 2012 HJ31 risk assessment - see above
Grabbed MPEC 2012-J01 - 2012 HZ33 - see above
Grabbed MPEC 2012-J02 - 2012 HA34 - see above
Grabbed MPEC 2012-J03 - Daily Orbit Update - see above
Grabbed MPEC 2012-J04 - 2008 CB22 - see above
Grabbed MPEC 2012-J05 - 2006 FZ51 - see above