Contents  on 18 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.

Radar Astrometry  on 18 September '09

Radar observation of one object

The JPL Solar System Dynamics Group Radar Astrometry database has added or updated the following small-body radar observing work:


Data update noted at 1906 UTC when the database was dated 18 Sept.

NEOCP Activity  on 18 September '09

The MPC's NEO Confirmation Page has 16 listings: 3 new, 13 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three new and thirteen updated listings. Of these, fifteen were "one nighters." So far The Tracking News has counted a total of 35 listings on the NEOCP at some point today.

New MPECs  on 18 September '09

Minor Planet Electronic Circulars

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


MPEC 2009-S43 - "16:21 UT" - 2009 SN1


MPEC 2009-S42 - "16:17 UT" - 2009 SM1


MPEC 2009-S41 - "16:14 UT" - 2009 SL1


MPEC 2009-S40 - "16:09 UT" - 2009 SK1


MPEC 2009-S39 - "15:45 UT" - 2009 SJ1


MPEC 2009-S38 - "15:35 UT" - 2009 SH1


MPEC 2009-S37 - "12:38 UT" - 2009 SD1


MPEC 2009-S36 - "12:35 UT" - 2009 SC1


MPEC 2009-S35 - "09:44 UT" - 2009 SY


MPEC 2009-S34 - "09:40 UT" - 2009 SX


MPEC 2009-S33 - "09:37 UT" - 2009 SW


MPEC 2009-S32 - "09:34 UT" - 2009 SV


MPEC 2009-S31 - "09:31 UT" - 2009 SU


MPEC 2009-S30 - "09:22 UT" - 2009 ST


MPEC 2009-S29 - "09:16 UT" - 2009 SS


<< DOU on 18 Sept. '09 >>  MPEC 2009-S28 - "06:07 UT" - Daily Orbit Update

Observers  on 18 September '09

Nineteen observing facilities appear in today's MPECs.

CodeObserver / observatory
H55Astronomical Research Obs. (ARO) in Illinois, 4 in MPECs 2009-S30, 2009-S33, 2009-S35 & 2009-S40 -- 2009 SY, 2009 SW, 2009 ST, 2009 SK1
B88Bigmuskie Obs. in Italy, 1 in MPEC 2009-S28 -- 2009 RB4
160Castelmartini Obs. in Italy, 2 in MPEC 2009-S28 -- 2009 MC9, 2002 NP1
703Catalina Sky Survey (CSS) in Arizona, 14 in MPECs 2009-S28, 2009-S37 & 2009-S40 -- 2009 SK1, 2009 SD1, 2009 RN, 2009 LX, 2009 KJ22, 2009 FY29, 2002 TN30, 2002 EL6, 1991 LH, 162980, 137805, 137078, 5751, 1943
H26Doc Greiner Research Obs. in Wisconsin, 1 in MPEC 2009-S28 -- 152664
F656Richard Miles in England via Faulkes Telescope North in Hawaii, 12 in MPECs 2009-S28, 2009-S31, 2009-S32, 2009-S33, 2009-S34, 2009-S35, 2009-S36, 2009-S37, 2009-S40, 2009-S41, 2009-S42 & 2009-S43 -- 2009 SY, 2009 SX, 2009 SW, 2009 SV, 2009 SU, 2009 SN1, 2009 SM1, 2009 SL1, 2009 SK1, 2009 SG, 2009 SD1, 2009 SC1
253Goldstone DSS-14 70m antenna in southern California, 1 in radar -- 2000 CO101
683Goodricke-Pigott Obs. in Arizona, 1 in MPEC 2009-S28 -- 143678
J81Guirguillano Obs. in Spain, 2 in MPEC 2009-S28 -- 2009 MC9, 2005 MC
J75La Sagra Obs. in Spain, 1 in MPEC 2009-S28 -- 55408
560Madonna di Dossobuono Obs. in Italy, 2 in MPEC 2009-S28 -- 2009 QZ6, 2009 MC9
G96Mt. Lemmon Survey (MLS) in Arizona, 18 in MPECs 2009-S28, 2009-S29, 2009-S30, 2009-S31, 2009-S32, 2009-S33, 2009-S34, 2009-S35, 2009-S36, 2009-S38, 2009-S39, 2009-S41, 2009-S42 & 2009-S43 -- 2009 SY, 2009 SX, 2009 SW, 2009 SV, 2009 SU, 2009 ST, 2009 SS, 2009 SN1, 2009 SM1, 2009 SL1, 2009 SJ1, 2009 SH1, 2009 SC1, 2009 QC36, 2004 QV16, 2000 RH60, 162181, 154278
644NEAT's Mt. Palomar telescope in southern California, 1 in MPEC 2009-S28 -- 2009 QY33
H36Sandlot Obs. in Kansas, 1 in MPEC 2009-S40 -- 2009 SK1
204Schiaparelli Obs. in Italy, 1 in MPEC 2009-S28 -- 2009 SN
691Spacewatch 0.9m telescope in Arizona, 9 in MPECs 2009-S28 & 2009-S31 -- 2009 SU, 2009 QZ34, 2007 RQ17, 2006 SP134, 2005 YX128, 2001 QK142, 1993 RA, 96536, 140158
291Spacewatch 1.8m telescope in Arizona, 16 in MPECs 2009-S28, 2009-S30, 2009-S31, 2009-S32, 2009-S34, 2009-S35, 2009-S39 & 2009-S42 -- 2009 SY, 2009 SX, 2009 SV, 2009 SU, 2009 ST, 2009 SM1, 2009 SJ1, 2009 RZ3, 2009 QO8, 2009 QO5, 2009 QF34, 2006 YY2, 2005 UK1, 2005 QS10, 2000 YF29, 1999 VO11
C00Velikie Luki Obs. in Russia, 1 in MPEC 2009-S28 -- 17274
G56Walnut Creek Obs. in northern California, 1 in MPEC 2009-S28 -- 2008 JO
For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring  on 18 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 SN1JPL Sentry18342032-208368.4e-09-8.03-8.420JPL: "Analysis based on 11 observations spanning .16279 days (2009-Sep-18.33912 to 2009-Sep-18.501911)." Diameter approximately 0.029 km. from mean, weighted H=25.3.
2009 SM1JPL Sentry18342013-21091067.4e-07-6.11-6.870JPL: "Analysis based on 18 observations spanning .25942 days (2009-Sep-18.23648 to 2009-Sep-18.495904)." Diameter approximately 0.034 km. from mean, weighted H=25.0.
2009 SK1JPL Sentry18342025-206691.5e-09-5.34-5.970JPL: "Analysis based on 15 observations spanning 1.1079 days (2009-Sep-17.41109 to 2009-Sep-18.519018)." Diameter approximately 0.710 km. from mean, weighted H=18.4.
2009 SH1JPL Sentry19062062-2107361.3e-06-8.35-8.620JPL: "Analysis based on 11 observations spanning .17911 days (2009-Sep-18.21141 to 2009-Sep-18.39052)." Diameter approximately 0.004 km. from mean, weighted H=29.5.
2009 SVJPL Sentry13412082-2108113.5e-09-6.04-6.690JPL: "Analysis based on 14 observations spanning 1.0104 days (2009-Sep-17.19449 to 2009-Sep-18.20489)." Diameter approximately 0.380 km. from mean, weighted H=19.7.
2009 SKNEODyS13412065-208071.4e-06-6.20-6.550NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2009/09/17.302 to 2009/09/17.474."
2009 SDNEODyS13412021-20851042.92e-05-4.45-5.310NEODyS: "Based on 15 optical observations (of which 0 are rejected as outliers) from 2009/09/16.285 to 2009/09/17.229."
2009 SBNEODyS20302012-20871371.16e-07-4.08-4.850NEODyS: "Based on 18 optical observations (of which 0 are rejected as outliers) from 2009/09/16.245 to 2009/09/17.322."
2009 RZ3JPL Sentry13412021-2107631.9e-07-3.01-3.560JPL: "Analysis based on 25 observations spanning 2.9393 days (2009-Sep-14.20535 to 2009-Sep-17.14466)." Diameter approximately 0.628 km. from mean, weighted H=18.7.
NEODyS13412021-2090491.36e-07-3.10-3.610NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2009/09/14.206 to 2009/09/17.145."

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 18 September '09

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

2030Noted that NEODyS has posted 2009 SB as an impact risk - see above
1906Noted that JPL Sentry has posted 2009 SH1 as an impact risk - see above
Noted Radar Astrometry database update - see above
1834Noted that JPL Sentry has posted 2009 SK1 as an impact risk - see above
Noted that JPL Sentry has posted 2009 SM1 as an impact risk - see above
Noted that JPL Sentry has posted 2009 SN1 as an impact risk - see above
1651Grabbed MPEC 2009-S38 - 2009 SH1 - see above
Grabbed MPEC 2009-S39 - 2009 SJ1 - see above
Grabbed MPEC 2009-S40 - 2009 SK1 - see above
Grabbed MPEC 2009-S41 - 2009 SL1 - see above
Grabbed MPEC 2009-S42 - 2009 SM1 - see above
Grabbed MPEC 2009-S43 - 2009 SN1 - see above
1341Noted 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 NEODyS has posted 2009 SD as an impact risk - see above
Noted that NEODyS has posted 2009 SK as an impact risk - see above
Noted that JPL Sentry has posted 2009 SV as an impact risk - see above
Grabbed MPEC 2009-S28 - Daily Orbit Update - see above
Grabbed MPEC 2009-S29 - 2009 SS - see above
Grabbed MPEC 2009-S30 - 2009 ST - see above
Grabbed MPEC 2009-S31 - 2009 SU - see above
Grabbed MPEC 2009-S32 - 2009 SV - see above
Grabbed MPEC 2009-S33 - 2009 SW - see above
Grabbed MPEC 2009-S34 - 2009 SX - see above
Grabbed MPEC 2009-S35 - 2009 SY - see above
Grabbed MPEC 2009-S36 - 2009 SC1 - see above
Grabbed MPEC 2009-S37 - 2009 SD1 - see above