Dawn spacecraft. 
Credit: Dawn mission.

The Dawn mission reported Friday that the spacecraft is now sneaking up to 4 Vesta "at only 240 meters per second (540 mph)." On June 6th it will be just one lunar distance from the second largest Main Belter, which presently is a very bright light to the onboard cameras but will soon begin to loom large. Illustration credit: Dawn mission.


Contents  on 29 May '11

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.

NEOCP Activity  on 29 May '11

The MPC's NEO Confirmation Page has 55 listings

When last checked at 2359 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had 55 objects listed. Of these, 31 were "one nighters." So far The Tracking News has counted a total of 73 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 29 May '11

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 2011-K49 - "22:55 UT" - 2011 KY15


MPEC 2011-K48 - "19:14 UT" - 2011 KX15


MPEC 2011-K47 - "17:27 UT" - 2011 KW15


MPEC 2011-K46 - "17:24 UT" - 2011 KV15


MPEC 2011-K45 - "17:04 UT" - 2011 KU15


MPEC 2011-K44 - "16:45 UT" - 2011 KT15


<< DOU on 29 May '11 >>  MPEC 2011-K43 - "07:07 UT" - Daily Orbit Update


MPEC 2011-K42 - "02:13 UT" - 2011 KK15


MPEC 2011-K41 - "01:57 UT" - 2011 KJ15

Observers  on 29 May '11

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

CodeObserver / observatory
703Catalina Sky Survey in Arizona, 1 in MPEC 2011-K42 -- 2011 KK15
807|Robert Holmes via Cerro Tololo Inter-American Obs. (CTIO) in Chile, 4 in MPECs 2011-K41, 2011-K43 & 2011-K47 -- 2011 KW15, 2011 KJ15, 2011 KD11, 2011 HO5
J04ESA Optical Ground Station (ESA OGS) in the Canary Islands, 4 in MPECs 2011-K41, 2011-K45, 2011-K46 & 2011-K48 -- 2011 KX15, 2011 KV15, 2011 KU15, 2011 KJ15
704LINEAR in New Mexico, 8 in MPECs 2011-K42, 2011-K43 & 2011-K49 -- 2011 KY15, 2011 KN9, 2011 KK15, 2011 HP, 2011 HO, 2011 HL7, 2011 GQ65, 3103
H01Magdalena Ridge Obs. (MRO) in New Mexico, 6 in MPECs 2011-K41, 2011-K42, 2011-K44, 2011-K45, 2011-K46 & 2011-K48 -- 2011 KX15, 2011 KV15, 2011 KU15, 2011 KT15, 2011 KK15, 2011 KJ15
B67Mirasteilas Obs. in Switzerland, 3 in MPEC 2011-K43 -- 2010 TV149, 2006 OY10, 2004 JO2
118Modra Obs. in Slovakia, 1 in MPEC 2011-K43 -- 2011 EZ78
C65Montsec Obs., 1 in MPEC 2011-K43 -- 263976
G96Mt. Lemmon Survey (MLS) in Arizona, 11 in MPECs 2011-K42, 2011-K43, 2011-K44, 2011-K45, 2011-K46 & 2011-K48 -- 2011 KX15, 2011 KV15, 2011 KU15, 2011 KT15, 2011 KK15, 2011 JL, 275714, 226554, 217390, 139047, 106589
A24New Millennium Obs. in Italy, 35 in MPEC 2011-K43 -- 2011 JR13, 2011 HQ, 2011 HP, 2011 HO, 2011 GQ65, 2011 EZ78, 2011 CH71, 2011 AO52, 2010 TU5, 2008 RJ1, 2008 GV20, 2007 PP6, 68348, 37336, 267759, 267494, 263976, 24445, 188174, 163696, 163250, 162474, 162463, 159399, 137170, 8567, 7889, 7482, 5626, 3988, 3288, 3103, 1917, 1866, 1036
D29Purple Mtn. Obs. Xuyi Station in China, 2 in MPEC 2011-K43 -- 2004 JO2, 7358
104San Marcello Pistoiese Obs. in Italy, 1 in MPEC 2011-K43 -- 2011 KK15
233San Vito Obs. in Italy, 1 in MPEC 2011-K43 -- 4954
204Schiaparelli Obs. in Italy, 3 in MPECs 2011-K41, 2011-K42 & 2011-K49 -- 2011 KY15, 2011 KK15, 2011 KJ15
E12Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2011-K42 & 2011-K47 -- 2011 KW15, 2011 KK15
691Spacewatch 0.9m telescope in Arizona, 2 in MPECs 2011-K41 & 2011-K43 -- 2011 KJ15, 138883
291Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2011-K41 & 2011-K43 -- 2011 KJ15, 2006 LK
I93St. Pardon de Conques Obs. in France, 2 in MPECs 2011-K41 & 2011-K48 -- 2011 KX15, 2011 KJ15
A92Urseanu Obs. in Romania, 1 in MPEC 2011-K43 -- 36284
H47Vicksburg Obs. in Mississippi, 1 in MPEC 2011-K43 -- 137170
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 29 May '11

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 CLOMON (backup) 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
2011 KE15NEODyS16242018-2071169.23e-05-4.45-4.950NEODyS: "Based on 11 optical observations (of which 0 are rejected as outliers) from 2011-05-26.262 to 2011-05-28.286."
2011 HO5JPL Sentry1624R E M O V E DJPL: Risk listing removed at 1051 UTC.

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 29 May '11

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

2306Grabbed MPEC 2011-K49 - 2011 KY15 - see above
2014Grabbed MPEC 2011-K48 - 2011 KX15 - see above
1820Grabbed MPEC 2011-K47 - 2011 KW15 - see above
1734Grabbed MPEC 2011-K46 - 2011 KV15 - see above
1705Grabbed MPEC 2011-K44 - 2011 KT15 - see above
Grabbed MPEC 2011-K45 - 2011 KU15 - see above
1624Noted that JPL Sentry has removed 2011 HO5 as an impact risk - see above
Noted that NEODyS has posted 2011 KE15 as an impact risk - see above
Grabbed MPEC 2011-K43 - Daily Orbit Update - see above
0242Grabbed MPEC 2011-K41 - 2011 KJ15 - see above
Grabbed MPEC 2011-K42 - 2011 KK15 - see above