3 Juno from Mt. Wilson with Hooker Telescope 
adaptive optics. Credit Sallie Baliunas et al.

Sky & Telescope and NASA JPL are helping backyard observers to spot the presently bright tenth largest Main Belt asteroid, now visible with binoculars (in good seeing conditions) in Pisces not too far from Jupiter. This adaptive optics image of 3 Juno came from Sallie Baliunas et al. in 2003 using the 2.54-meter Hooker Telescope on Mt. Wilson.


Contents  on 20 September '09

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 20 September '09

The MPC's NEO Confirmation Page has 9 listings: 4 new, 5 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four new and five updated listings. Of these, seven were "one nighters." The Tracking News counted a total of fourteen listings on the NEOCP at some point on this day.

New MPECs  on 20 September '09

Minor Planet Electronic Circulars

There were five MPECs posted this day from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.


MPEC 2009-S59 - "23:56 UT" - 2009 MS9


MPEC 2009-S58 - "14:45 UT" - 2009 SD15


MPEC 2009-S57 - "14:42 UT" - 2009 SC15


MPEC 2009-S56 - "14:39 UT" - 2009 SB15


<< DOU on 20 Sept. '09 >>  MPEC 2009-S55 - "06:08 UT" - Daily Orbit Update

Observers  on 20 September '09

A total of 21 observing facilities appeared in this day's MPECs.

CodeObserver / observatory
B03Alter Satzberg Obs. in Austria, 1 in MPEC 2009-S55 -- 2009 QK2
H55Astronomical Research Obs. (ARO) in Illinois, 7 in MPECs 2009-S55 & 2009-S56 -- 2009 SX1, 2009 SQ, 2009 SK2, 2009 SF2, 2009 SB15, 2009 RZ3, 2009 RD1
B75Betelgeuse Station in Italy, 2 in MPEC 2009-S55 -- 2008 EE5, 12711
703Catalina Sky Survey (CSS) in Arizona, 7 in MPEC 2009-S55 -- 2009 SG, 2002 TN30, 38091, 218017, 20826, 159402, 143487
H26Doc Greiner Research Obs. in Wisconsin, 1 in MPEC 2009-S55 -- 2009 SQ
I21El Condor Obs. in Argentina, 1 in MPEC 2009-S55 -- 2009 QL8
J95Great Shefford Obs. in England, 2 in MPEC 2009-S55 -- 2009 SN, 2009 SJ1
A17Guidestar Obs. in Germany, 1 in MPEC 2009-S55 -- 2009 QK2
B15Inastars Obs. in Germany, 3 in MPEC 2009-S55 -- 2000 SO10, 163697, 8035
568Mauna Kea in Hawaii, 1 in MPEC 2009-S59 -- 2009 MS9
G96Mt. Lemmon Survey (MLS) in Arizona, 6 in MPECs 2009-S55, 2009-S56, 2009-S57 & 2009-S58 -- 2009 SD15, 2009 SC15, 2009 SB15, 2004 RK9, 162168, 143409
675Mt. Palomar in southern California, 1 in MPEC 2009-S59 -- 2009 MS9
D90|H. Sato in Japan via RAS Obs. Moorook in South Australia, 1 in MPEC 2009-S55 -- 3552
I20Rio Cuarto Obs. in Argentina, 5 in MPEC 2009-S55 -- 2009 RZ3, 2009 RT1, 2009 RM, 2009 RH, 2001 HA4
H36Sandlot Obs. in Kansas, 5 in MPECs 2009-S55 & 2009-S57 -- 2009 SW1, 2009 SK2, 2009 SC15, 2009 QE34, 159402
E12Siding Spring Survey (SSS) in New South Wales, 4 in MPEC 2009-S55 -- 2009 NH, 2005 RQ6, 2004 JR1, 2001 TX44
691Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2009-S55 -- 30825
291Spacewatch 1.8m telescope in Arizona, 9 in MPECs 2009-S55 & 2009-S57 -- 2009 SK, 2009 SD, 2009 SC15, 2009 SC, 2009 SB, 2009 RV1, 2009 QA35, 2006 SP134, 2004 RK9
6735Jim Young via Table Mtn. Obs. in southern California, 2 in MPEC 2009-S55 -- 2009 SH2, 2009 SG2
C00Velikie Luki Obs. in Russia, 1 in MPEC 2009-S55 -- 2009 KC3
G56Walnut Creek Obs. in northern California, 3 in MPEC 2009-S55 -- 2009 SQ, 2009 QO, 2009 QC36
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 20 September '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.
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
2009 SD15JPL Sentry16592066-210551.0e-06-7.03-7.130JPL: "Analysis based on 12 observations spanning 1.1430 days (2009-Sep-19.24181 to 2009-Sep-20.38483)." Diameter approximately 0.014 km. from mean, weighted H=26.9.
2009 SC15JPL Sentry18012013-2107653.7e-07-4.28-4.350JPL: "Analysis based on 18 observations spanning 1.1093 days (2009-Sep-19.2394 to 2009-Sep-20.34871)." Diameter approximately 0.153 km. from mean, weighted H=21.7.
2009 SB15JPL Sentry1659201611.7e-10-7.72-7.720JPL: "Analysis based on 18 observations spanning 2.0748 days (2009-Sep-18.39595 to 2009-Sep-20.47073)." Diameter approximately 0.130 km. from mean, weighted H=22.1.
2009 SK2JPL Sentry1443R E M O V E DJPL: Risk listing removed at 1027 UTC.
2009 SH2JPL Sentry14432041-2082762.3e-05-4.61-5.170JPL: "Analysis based on 13 observations spanning .68945 days (2009-Sep-18.76541 to 2009-Sep-19.45486)." Diameter approximately 0.045 km. from mean, weighted H=24.4.
NEODyS14432035-2089391.9e-05-4.69-5.250NEODyS: "Based on 13 optical observations (of which 0 are rejected as outliers) from 2009/09/18.766 to 2009/09/19.456."
2009 SG2JPL Sentry1443R E M O V E DJPL: Risk listing removed at 1030 UTC.
2009 SX1NEODyS1443R E M O V E D-
JPL Sentry1443R E M O V E DJPL: Risk listing removed at 1041 UTC.
2009 SW1NEODyS1443R E M O V E D-
JPL Sentry1443R E M O V E DJPL: Risk listing removed at 0950 UTC.
2009 SBJPL Sentry14432033-2108128.9e-08-4.47-4.990JPL: "Analysis based on 24 observations spanning 3.0207 days (2009-Sep-16.24433 to 2009-Sep-19.26508)." Diameter approximately 0.290 km. from mean, weighted H=20.3.
NEODyS14432022-2068112.27e-08-4.75-5.000NEODyS: "Based on 24 optical observations (of which 0 are rejected as outliers) from 2009/09/16.245 to 2009/09/19.266."
2009 RZ3JPL Sentry14432025-2108283.8e-07-2.96-3.650JPL: "Analysis based on 40 observations spanning 4.9625 days (2009-Sep-14.20535 to 2009-Sep-19.1679)." Diameter approximately 0.631 km. from mean, weighted H=18.7.
NEODyS14432025-2090221.31e-07-3.28-3.800NEODyS: "Based on 40 optical observations (of which 0 are rejected as outliers) from 2009/09/14.206 to 2009/09/19.169."

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 20 September '09

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

0017 9/21Grabbed MPEC 2009-S59 - 2009 MS9 - see above
1801Noted that JPL Sentry has posted 2009 SC15 as an impact risk - see above
1659Noted that JPL Sentry has posted 2009 SB15 as an impact risk - see above
Noted that JPL Sentry has posted 2009 SD15 as an impact risk - see above
1538Grabbed MPEC 2009-S57 - 2009 SC15 - see above
Grabbed MPEC 2009-S58 - 2009 SD15 - see above
1443Noted that JPL Sentry has updated its 2009 RZ3 risk assessment - see above
Noted that NEODyS has updated its 2009 RZ3 risk assessment - see above
Noted that JPL Sentry has updated its 2009 SB risk assessment - see above
Noted that NEODyS has updated its 2009 SB risk assessment - see above
Noted that JPL Sentry has removed 2009 SG2 as an impact risk - see above
Noted that JPL Sentry has updated its 2009 SH2 risk assessment - see above
Noted that NEODyS has posted 2009 SH2 as an impact risk - see above
Noted that JPL Sentry has removed 2009 SK2 as an impact risk - see above
Noted that JPL Sentry has removed 2009 SW1 as an impact risk - see above
Noted that NEODyS has removed 2009 SW1 as an impact risk - see above
Noted that JPL Sentry has removed 2009 SX1 as an impact risk - see above
Noted that NEODyS has removed 2009 SX1 as an impact risk - see above
Grabbed MPEC 2009-S55 - Daily Orbit Update - see above
Grabbed MPEC 2009-S56 - 2009 SB15 - see above