Contents  on 21 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 21 May '12

Three objects reported inside ten LD

Three asteroids are reported flying inside ten lunar distances (LD) of Earth today. Within Earth's Hill sphere, 2012 KW comes its closest to Earth this time around, reaching 3.38 LD at 2046 UTC. Further away, unseen 2010 KK37 is calculated to be outbound from 4.4 to 6.7 LD (with an Earth passage uncertainty of +/- 1.160 days) and 2012 JV11 is inbound from 8.07 to 6.68 LD.

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

This report was generated at 1526 UTC with follow-up in today's DOU MPEC for 2012 KW, 2012 JV11, and departed 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. See also current sky chart and object details (alt-details), ephemerides, and today's timeline.

NEOCP Activity  on 21 May '12

The MPC's NEO Confirmation Page has 27 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 27 objects listed. Of these, 20 were "one nighters." So far The Tracking News has counted a total of 62 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 21 May '12

Minor Planet Electronic Circulars

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

MPEC 2012-K37 - "22:18 UT" - Comet P/2005 K3 = 2012 K2 (McNaught)

MPEC 2012-K36 - "17:53 UT" - Comet C/2012 K1 (Panstarrs)

MPEC 2012-K35 - "17:01 UT" - 2012 KO11

MPEC 2012-K34 - "16:59 UT" - 2012 KN11

MPEC 2012-K33 - "16:57 UT" - 2012 KM11

MPEC 2012-K32 - "16:55 UT" - 2012 KL11

MPEC 2012-K31 - "16:53 UT" - 2012 KK11

MPEC 2012-K30 - "16:51 UT" - 2012 KJ11

<< DOU on 21 May '12 >>  MPEC 2012-K29 - "06:03 UT" - Daily Orbit Update

Observers  on 21 May '12

Nineteen observers appear in today's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2012-K29 -- 2012 KD6
C60Argelander Institute for Astronomy Obs. in Germany, 5 in MPEC 2012-K29 -- 2011 WV134, 2010 LJ14, 162980, 7889, 1866
H21Astronomical Research Obs. Westfield in Illinois, 17 in MPECs 2012-K29 & 2012-K36 -- 2012 KY3, 2012 KX, 2012 KW, 2012 KA4, C/2012 K1, 2012 JT17, 2012 JR17, 2012 JB16, 2012 HS15, 2012 HR15, 2012 HK31, 2012 HK, 2012 CL2, 2012 BD27, 2009 KL2, 2004 PM2, 2004 FJ29
I47Auger Obs. in Argentina, 1 in MPEC 2012-K37 -- P/2012 K2
160Castelmartini Obs. in Italy, 5 in MPEC 2012-K29 -- 2011 WV134, 326732, 322966, 312473, 141018
703Catalina Sky Survey (CSS) in Arizona, 3 in MPEC 2012-K29 -- 297274, 154555, 1620
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 18 in MPECs 2012-K29, 2012-K32, 2012-K33, 2012-K34 & 2012-K35 -- 2012 KO11, 2012 KN11, 2012 KM11, 2012 KL11, 2012 KD6, 2012 JW11, 2012 JV11, 2012 JR17, 2012 JQ4, 2012 JQ, 2012 JN4, 2012 JM4, 2012 HO1, 2012 HC34, 2012 DX75, 2012 DW30, 2012 AA11, 2005 MB
106Crni Vrh Obs. in Slovenia, 2 in MPEC 2012-K29 -- 2012 KC6, 2012 HJ1
E100Tim Lister in southern California via Faulkes Telescope South in New South Wales, 5 in MPECs 2012-K31, 2012-K32, 2012-K33, 2012-K34 & 2012-K35 -- 2012 KO11, 2012 KN11, 2012 KM11, 2012 KL11, 2012 KK11
H01Magdalena Ridge Obs. (MRO) in New Mexico, 4 in MPECs 2012-K30, 2012-K31, 2012-K32 & 2012-K34 -- 2012 KN11, 2012 KL11, 2012 KK11, 2012 KJ11
932McCarthy Obs. in Connecticut, 1 in MPEC 2012-K29 -- 2012 JB16
118Modra Obs. in Slovakia, 2 in MPECs 2012-K29 & 2012-K36 -- 2012 KD6, C/2012 K1
G96Mt. Lemmon Survey (MLS) in Arizona, 9 in MPECs 2012-K29, 2012-K30, 2012-K31, 2012-K33 & 2012-K36 -- 2012 KM11, 2012 KK11, 2012 KJ11, C/2012 K1, 2012 JO4, 2012 HJ1, 2009 KJ22, 2008 MZ, 1998 HJ3
F51Pan-STARRS 1 (PS1) in Hawaii, 7 in MPECs 2012-K29, 2012-K31, 2012-K32, 2012-K33, 2012-K34, 2012-K35 & 2012-K36 -- 2012 KO11, 2012 KN11, 2012 KM11, 2012 KL11, 2012 KK11, C/2012 K1, 2012 JR4
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-K36 -- C/2012 K1
461SZTE Asteroid Program in Hungary, 1 in MPEC 2012-K36 -- C/2012 K1
H36Sandlot Obs. in Kansas, 3 in MPECs 2012-K29, 2012-K31 & 2012-K35 -- 2012 KO11, 2012 KK11, 2012 HK31
691Spacewatch 0.9m telescope in Arizona, 3 in MPEC 2012-K29 -- 2012 HY33, 2012 HG31, 2010 XG11
291Spacewatch 1.8m telescope in Arizona, 11 in MPECs 2012-K29 & 2012-K32 -- 2012 KL11, 2012 JU11, 2012 JS11, 2012 JR17, 2012 HN13, 2012 HG2, 2010 NT1, 2010 JU39, 2009 SD229, 2006 SW5, 1999 LK1
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 21 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 Sentry19392017-2110179.3e-09-3.01-3.140JPL: "Analysis based on 23 observations spanning 4.0250 days (2012-May-17.14893 to 2012-May-21.1739)." Diameter approximately 1.600 km. from mean, weighted H=16.7.
2012 KD6JPL Sentry1458R E M O V E DJPL: Risk listing removed at 0851 UTC.
2012 JR17JPL Sentry1458209511.5e-08-4.45-4.450JPL: "Analysis based on 55 observations spanning 6.0194 days (2012-May-14.41872 to 2012-May-20.43808)." Diameter approximately 1.100 km. from mean, weighted H=17.4.
2012 JS11JPL Sentry14582069-207421.2e-08-5.41-5.440JPL: "Analysis based on 26 observations spanning 5.0363 days (2012-May-15.35926 to 2012-May-20.39556)." Diameter approximately 0.360 km. from mean, weighted H=19.9.
2012 HG2JPL Sentry14582053-205435.6e-06-6.35-6.430JPL: "Analysis based on 175 observations spanning 30.038 days (2012-Apr-20.37147 to 2012-May-20.40907)." Diameter approximately 0.014 km. from mean, weighted H=27.0.
NEODyS14582053-20912421.17e-03-4.14-4.870NEODyS: "Based on 172 optical observations (of which 9 are rejected as outliers) from 2012-04-20.372 to 2012-05-20.410."

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 21 May '12

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

2307Grabbed MPEC 2012-K37 - Comet P/2005 K3 = 2012 K2 (McNaught) - see above
1939Noted that JPL Sentry has posted 2012 KJ11 as an impact risk - see above
1832Grabbed MPEC 2012-K36 - Comet C/2012 K1 (Panstarrs) - see above
1715Grabbed MPEC 2012-K30 - 2012 KJ11 - see above
Grabbed MPEC 2012-K31 - 2012 KK11 - see above
Grabbed MPEC 2012-K32 - 2012 KL11 - see above
Grabbed MPEC 2012-K33 - 2012 KM11 - see above
Grabbed MPEC 2012-K34 - 2012 KN11 - see above
Grabbed MPEC 2012-K35 - 2012 KO11 - see above
1526Generated Traffic Report
1458Noted 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 removed 2012 KD6 as an impact risk - see above
Grabbed MPEC 2012-K29 - Daily Orbit Update - see above