Contents  on 23 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 23 May '12

Four objects reported inside ten LD

There are four asteroids reported passing within ten lunar distances (LD) of our planet today. Inside Earth's Hill sphere, 2012 KT12 comes its closest to Earth on this passage, reaching 1.4 LD* at 1712 UTC (uncertainty: +/- 16 minutes), and its closest to the Moon -- 1.5 LD* at 2040 UTC. Further away, 2012 KW is departing, moving from 4.25 to 5.91 LD, 2012 JV11 departs from inside ten LD, passing from 7.91 to 10.91 LD, and 2010 KK37, with no recovery reported yet, is calculated with great uncertainty to leave ten LD, traveling from 9.0 to 11.4 LD*.

No other known objects are predicted to come within ten LD until November.

This report was generated at 1540 UTC with follow-up in today's DOU MPEC for departed 2012 HG2 and distant 68216 2001 CV26.


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 23 May '12

The MPC's NEO Confirmation Page has 19 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had nineteen objects listed. Of these, sixteen were "one nighters." So far The Tracking News has counted a total of 38 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 23 May '12

Minor Planet Electronic Circulars

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


MPEC 2012-K50 - "19:47 UT" - Comet P/2012 K3 (Gibbs)


MPEC 2012-K49 - "16:25 UT" - 2012 KO18


MPEC 2012-K48 - "16:23 UT" - 2012 KN18


MPEC 2012-K47 - "16:21 UT" - 2012 KM18


MPEC 2012-K46 - "16:20 UT" - 2012 KL18


MPEC 2012-K45 - "16:18 UT" - 2012 KK18


MPEC 2012-K44 - "16:16 UT" - 2012 KJ18


<< DOU on 23 May '12 >>  MPEC 2012-K43 - "06:03 UT" - Daily Orbit Update

Observers  on 23 May '12

A total of 24 observers appear in today's MPECs.

CodeObserver / observatory
E23Arcadia Obs. in New South Wales, 1 in MPEC 2012-K50 -- P/2012 K3
H21Astronomical Research Obs. Westfield in Illinois, 16 in MPECs 2012-K43, 2012-K44, 2012-K45, 2012-K47, 2012-K48, 2012-K49 & 2012-K50 -- 2012 KY3, 2012 KX, 2012 KO18, 2012 KN18, 2012 KM18, 2012 KK18, 2012 KJ18, 2012 KD6, 2012 KA4, P/2012 K3, 2012 JR17, 2012 JB16, 2012 HZ33, 2012 HN8, 2012 HK31, 2012 HJ1
160Castelmartini Obs. in Italy, 5 in MPEC 2012-K43 -- 2011 WV134, 2000 JB6, 1994 NK, 326732, 322966
703Catalina Sky Survey (CSS) in Arizona, 7 in MPECs 2012-K43 & 2012-K49 -- 2012 KO18, 2010 LJ14, 2009 XG8, 2003 HP32, 2002 JC9, 24475, 141018
807|Robert Holmes in Illinois via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 12 in MPECs 2012-K43, 2012-K44, 2012-K45, 2012-K46 & 2012-K50 -- 2012 KO11, 2012 KL18, 2012 KL11, 2012 KK18, 2012 KK11, 2012 KJ18, P/2012 K3, 2012 JW11, 68216, 276397, 5645, 3908
J04ESA Optical Ground Station in the Canary Islands, 1 in MPEC 2012-K50 -- P/2012 K3
F657Paul Roche in Wales via Faulkes Telescope North in Hawaii, 1 in MPEC 2012-K50 -- P/2012 K3
E102Ernesto Guido in Italy via Faulkes Telescope South in New South Wales, 1 in MPEC 2012-K50 -- P/2012 K3
E105Richard Miles in England via Faulkes Telescope South in New South Wales, 1 in MPEC 2012-K46 -- 2012 KL18
J87La Canada Obs. in Spain, 1 in MPEC 2012-K49 -- 2012 KO18
H01Magdalena Ridge Obs. (MRO) in New Mexico, 2 in MPECs 2012-K43 & 2012-K49 -- 2012 KZ3, 2012 KO18
5682David Tholen's team on Mauna Kea in Hawaii, 1 in MPEC 2012-K43 -- 2012 BV26
711McDonald Obs. in Texas, 1 in MPEC 2012-K50 -- P/2012 K3
474Mt. John Obs. in New Zealand, 1 in MPEC 2012-K46 -- 2012 KL18
G96Mt. Lemmon Survey (MLS) in Arizona, 12 in MPECs 2012-K43, 2012-K44, 2012-K45, 2012-K47, 2012-K48, 2012-K49 & 2012-K50 -- 2012 KO18, 2012 KN18, 2012 KM18, 2012 KK18, 2012 KJ18, P/2012 K3, 2007 VH186, 2006 SW5, 66272, 18109, 172722, 12923
I89Nerpio Obs. in Italy, 1 in MPEC 2012-K50 -- P/2012 K3
F51Pan-STARRS 1 (PS1) in Hawaii, 4 in MPEC 2012-K43 -- 2012 JH11, 66272, 297274, 7088
H06|Hidetaka Sato in Japan via RAS Obs. Mayhill in New Mexico, 1 in MPEC 2012-K50 -- P/2012 K3
854Sabino Canyon Obs. in Arizona, 1 in MPEC 2012-K49 -- 2012 KO18
H36Sandlot Obs. in Kansas, 5 in MPECs 2012-K43 & 2012-K49 -- 2012 KO18, 2012 KC6, 2012 JX11, 2012 JS17, 2012 JO4
E12Siding Spring Survey in New South Wales, 1 in MPEC 2012-K46 -- 2012 KL18
691Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2012-K43 -- 2011 MB2, 2005 YS165, 2002 JE9, 24445
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2012-K43 -- 2012 HG2, 2012 HD20, 2012 CP2, 2011 SJ16
C36Starry Wanderer Obs., 1 in MPEC 2012-K43 -- 2011 WV134
B18Terskol Obs. in Russia, 1 in MPEC 2012-K49 -- 2012 KO18
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 23 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.
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 KN18JPL Sentry18232056-211141.7e-08-7.48-7.640JPL: "Analysis based on 15 observations spanning .98162 days (2012-May-22.30292 to 2012-May-23.28454)." Diameter approximately 0.044 km. from mean, weighted H=24.4.
2012 JR17JPL Sentry1538209516.8e-09-4.82-4.820JPL: "Analysis based on 60 observations spanning 7.9709 days (2012-May-14.41872 to 2012-May-22.3896)." Diameter approximately 1.100 km. from mean, weighted H=17.5.
2012 HG2JPL Sentry15382053-21113522.0e-03-3.94-4.380JPL: "Analysis based on 199 observations spanning 32.019 days (2012-Apr-20.37147 to 2012-May-22.39027)." Diameter approximately 0.014 km. from mean, weighted H=27.0.
NEODyS15382053-20902081.22e-03-4.13-4.780NEODyS: "Based on 196 optical observations (of which 9 are rejected as outliers) from 2012-04-20.372 to 2012-05-22.391."

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 23 May '12

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

2001Grabbed MPEC 2012-K50 - Comet P/2012 K3 (Gibbs) - see above
1823Noted that JPL Sentry has posted 2012 KN18 as an impact risk - see above
1635Grabbed MPEC 2012-K44 - 2012 KJ18 - see above
Grabbed MPEC 2012-K45 - 2012 KK18 - see above
Grabbed MPEC 2012-K46 - 2012 KL18 - see above
Grabbed MPEC 2012-K47 - 2012 KM18 - see above
Grabbed MPEC 2012-K48 - 2012 KN18 - see above
Grabbed MPEC 2012-K49 - 2012 KO18 - see above
1540Generated Traffic Report
1538Noted 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
Grabbed MPEC 2012-K43 - Daily Orbit Update - see above