Contents  on 25 June '09


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 25 June '09

The MPC's NEO Confirmation Page has 3 listings: 1 new, 2 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one new and two updated listings. All of these were "one nighters." So far The Tracking News has counted a total of four listings on the NEOCP at some point 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 25 June '09

Minor Planet Electronic Circulars

As of last check at 2358 UTC, there have been three MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.

MPEC 2009-M37 - "22:22 UT" - Comets C/2009 B6, 2009 B7, 2009 C1, 2009 C2 (STEREO)

MPEC 2009-M36 - "15:05 UT" - 2009 MX6

<< DOU on 25 June '09 >>  MPEC 2009-M35 - "06:07 UT" - Daily Orbit Update

Observers  on 25 June '09

Sixteen observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 12 in MPEC 2009-M35 -- 2009 MU, 2009 MS, 2009 MG1, 2009 MA, 2009 KV2, 2009 KK8, 2009 KJ22, 2009 KD5, 2009 KC7, 2009 HV77, 2009 FN28, 2009 AS
432Boambee Obs. in New South Wales, 5 in MPEC 2009-M35 -- 207945, 143651, 108519, 4954, 3552
I77CEAMIG-REA in Brazil, 1 in MPEC 2009-M36 -- 2009 MX6
B09Capannoli Obs. in Italy, 1 in MPEC 2009-M35 -- 2002 LV
703Catalina Sky Survey (CSS) in Arizona, 8 in MPEC 2009-M35 -- 2009 MW, 2009 KD5, 2004 LC2, 2002 LT38, 39557, 214088, 5693, 433
850Cordell-Lorenz Obs. in Tennessee, 1 in MPEC 2009-M36 -- 2009 MX6
I21El Condor Obs. in Argentina, 1 in MPEC 2009-M35 -- 2009 KN4
734Farpoint Obs. in Kansas, 1 in MPEC 2009-M35 -- 2009 AS
B28Mandi Obs. in Italy, 1 in MPEC 2009-M35 -- 2001 FE90
G96Mt. Lemmon Survey (MLS) in Arizona, 4 in MPEC 2009-M35 -- 2009 KK8, 2009 AS, 2004 HM1, 162900
A13Naef Obs. in Switzerland, 2 in MPEC 2009-M35 -- 2009 KJ22, 2002 LV
C494HI1-A instrument (4) aboard STEREO-A in heliocentric orbit leading Earth, 4 in MPEC 2009-M37 -- C/2009 C2, C/2009 C1, C/2009 B7, C/2009 B6
E12Siding Spring Survey (SSS) in New South Wales, 8 in MPECs 2009-M35 & 2009-M36 -- 2009 MX6, 2009 MM1, 2009 LX, 2009 KN4, 2009 KE3, 2009 KC3, 2004 MW2, 9950
B40Skylive Obs. in Italy, 2 in MPEC 2009-M35 -- 2009 KL2, 2002 LV
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2009-M35 -- 2009 KJ22
291Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2009-M35 -- 2009 MS, 2009 LW2, 2009 KT21, 2009 AS
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 25 June '09

Summary Risk Table for Risk Assessments Updated Today   (last checks: NEODyS and JPL at 2358 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. Beginning Jan. 22nd, both are also posting impact solutions beyond 100 years for a few 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.





Notes for Today's Latest Risk Assessments
2009 MG1JPL Sentry17342079-208333.7e-07-5.96-6.210JPL: "Analysis based on 18 observations spanning 2.9300 days (2009-Jun-21.27223 to 2009-Jun-24.20218)." Diameter approximately 0.053 km. from mean, weighted H=24.0.
NEODyS17342079-208333.38e-07-5.99-6.230NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2009/06/21.273 to 2009/06/24.203."
2009 MUJPL Sentry1734209612.5e-07-6.58-6.580JPL: "Analysis based on 88 observations spanning 4.8184 days (2009-Jun-19.30659 to 2009-Jun-24.12497)." Diameter approximately 0.042 km. from mean, weighted H=24.5.
2009 MSJPL Sentry1734R E M O V E DJPL: Risk listing removed at 1650 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 25 June '09

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

2309Grabbed MPEC 2009-M37 - Comets C/2009 B6, 2009 B7, 2009 C1, 2009 C2 (STEREO) - see above
1734Noted that JPL Sentry has updated its 2009 MG1 risk assessment - see above
Noted that NEODyS has updated its 2009 MG1 risk assessment - see above
Noted that JPL Sentry has removed 2009 MS as an impact risk - see above
Noted that JPL Sentry has updated its 2009 MU risk assessment - see above
1600Grabbed MPEC 2009-M35 - Daily Orbit Update - see above
Grabbed MPEC 2009-M36 - 2009 MX6 - see above