Contents  on 22 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 22 May '12

Four objects reported inside ten LD

Four objects are reported to be inside ten lunar distances (LD) of Earth today. Inside Earth's Hill sphere, newly announced 2012 KT12 moves from 2.0 to 1.6 LD*, and 2012 KW exits the sphere, traveling from 3.39 to 4.25 LD. Out further, 2010 KK37 is calculated with great uncertainty to be outbound from 6.7 to 9.0 LD* and 2012 JV11 comes its closest to Earth this time around, reaching 6.68 LD at 0050 UTC.

No other objects are predicted to be coming within ten LD until November.

This report was updated at 2051 UTC with new discovery 2012 KT12 (MPEC) and, earlier, follow-up in today's DOU MPEC for 2012 HG2. Today's first traffic report was generated at 1642 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. 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 22 May '12

The MPC's NEO Confirmation Page has 33 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 33 objects listed. Of these, 22 were "one nighters." So far The Tracking News has counted a total of 43 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 22 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-K42 - "21:36 UT" - Comet P/2012 H1 (Panstarrs)

MPEC 2012-K41 - "18:44 UT" - Comet P/2008 R1 (Garradd)

MPEC 2012-K40 - "17:59 UT" - 2012 KU12

MPEC 2012-K39 - "17:57 UT" - 2012 KT12

<< DOU on 22 May '12 >>  MPEC 2012-K38 - "06:03 UT" - Daily Orbit Update

Observers  on 22 May '12

A total of 20 observers appear in today's MPECs.

CodeObserver / observatory
I99Blanquita Obs. in Spain, 2 in MPEC 2012-K38 -- 86667, 141018
160Castelmartini Obs. in Italy, 1 in MPEC 2012-K38 -- 312473
703Catalina Sky Survey (CSS) in Arizona, 11 in MPEC 2012-K38 -- 2012 KD6, 2011 YV15, 2006 VY13, 66407, 65909, 222073, 163243, 152754, 10302, 6455, 3352
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 9 in MPECs 2012-K38 & 2012-K40 -- 2012 KY3, 2012 KU12, 2012 JW11, 2012 JR17, 2012 JQ4, 2012 JM4, 2006 MD12, 2003 KU2, 2001 LM5
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 1 in MPEC 2012-K40 -- 2012 KU12
704LINEAR in New Mexico, 13 in MPECs 2012-K38 & 2012-K39 -- 2012 KT12, 2012 HN40, 2012 HJ1, 2009 KJ22, 86667, 85628, 328059, 322966, 297274, 6455, 5836, 4055, 3352
H01Magdalena Ridge Obs. in New Mexico, 1 in MPEC 2012-K40 -- 2012 KU12
568_Marco Micheli on Mauna Kea in Hawaii, 1 in MPEC 2012-K41 -- P/2008 R1
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPEC 2012-K38 -- 2012 JO4, 2009 KL2, 2006 WN1, 2003 WO7, 1999 YA, 16960, 138013, 100926, 1221
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2012-K42 -- P/2012 H1
F51Pan-STARRS 1 (PS1) in Hawaii, 14 in MPECs 2012-K38 & 2012-K40 -- 2012 KU12, 2012 KO1, 2012 KB4, 2011 MB2, 2009 OC, 2004 VB, 2004 FF29, 65909, 328059, 258325, 154715, 154555, 4947, 1221
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-K38 -- 2012 GS5
I33SOAR in Chile, 1 in MPEC 2012-K41 -- P/2008 R1
H36Sandlot Obs. in Kansas, 2 in MPEC 2012-K38 -- 2012 JS11, 2012 HK31
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-K38 -- 4179
0945program code 5 via Simeis Obs. in the Ukraine, 3 in MPEC 2012-K38 -- 2012 HG2, 326290, 312473
691Spacewatch 0.9m telescope in Arizona, 4 in MPECs 2012-K38 & 2012-K42 -- P/2012 H1, 2011 UL21, 2004 RU331, 2002 JE9
291Spacewatch 1.8m telescope in Arizona, 13 in MPECs 2012-K38 & 2012-K40 -- 2012 KU12, 2012 KJ11, 2012 JS11, 2012 HN13, 2012 HG2, 2012 FQ1, 2012 FK35, 2010 UT7, 2010 SO16, 2010 OS22, 2010 HQ80, 2007 JJ35, 2004 JN2
C36Starry Wanderer Obs., 1 in MPEC 2012-K38 -- 2011 WV134
H47Vicksburg Obs. in Mississippi, 2 in MPEC 2012-K38 -- 2011 WV134, 322966
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 22 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 KJ11JPL Sentry16402017-2110134.9e-09-3.21-3.330JPL: "Analysis based on 26 observations spanning 4.9977 days (2012-May-17.14893 to 2012-May-22.14668)." Diameter approximately 1.600 km. from mean, weighted H=16.6.
NEODyS16402017-2089165.91e-09-3.06-3.180NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2012-05-17.150 to 2012-05-22.147."
2012 JR17JPL Sentry1640209511.4e-08-4.51-4.510JPL: "Analysis based on 57 observations spanning 7.0146 days (2012-May-14.41872 to 2012-May-21.43335)." Diameter approximately 1.100 km. from mean, weighted H=17.5.
2012 JS11JPL Sentry1640206911.6e-09-6.28-6.280JPL: "Analysis based on 31 observations spanning 5.9928 days (2012-May-15.35926 to 2012-May-21.35203)." Diameter approximately 0.360 km. from mean, weighted H=19.9.
2012 HG2JPL Sentry16402053-205672.6e-05-5.70-5.980JPL: "Analysis based on 196 observations spanning 30.992 days (2012-Apr-20.37147 to 2012-May-21.36336)." Diameter approximately 0.014 km. from mean, weighted H=27.0.
NEODyS16402053-20912341.26e-03-4.11-4.790NEODyS: "Based on 193 optical observations (of which 9 are rejected as outliers) from 2012-04-20.372 to 2012-05-21.364."

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 22 May '12

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

2156Grabbed MPEC 2012-K42 - Comet P/2012 H1 (Panstarrs) - see above
2051Updated Traffic Report
1930Grabbed MPEC 2012-K41 - Comet P/2008 R1 (Garradd) - see above
1849Grabbed MPEC 2012-K39 - 2012 KT12 - see above
Grabbed MPEC 2012-K40 - 2012 KU12 - see above
1640Noted 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 JR17 risk assessment - see above
Noted that JPL Sentry has updated its 2012 JS11 risk assessment - see above
Noted that JPL Sentry has updated its 2012 KJ11 risk assessment - see above
Noted that NEODyS has posted 2012 KJ11 as an impact risk - see above
Grabbed MPEC 2012-K38 - Daily Orbit Update - see above