2009-05-05 Tracking News

Contents on 5 May '09

IAU Minor Planet Center
- NEOCP Activity -- three listings: 3 updated
- New MPECs -- four MPECs
Observers -- thirteen observing facilities
Impact Risk Monitoring -- five objects
Chronology

Resources:

Consolidated Risk Tables - the CRT page
Earth's Busy Neighborhood Traffic Report
Ephemerides for risk-rated and nearby objects
Old & new CRT Archive
Old News Archive & Small Objects Archive

The latest A/CC news is available via framed access, 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 5 May '09

The MPC's NEO Confirmation Page has 3 listings: 3 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had three updated listings. All of these were "one nighters." So far The Tracking News has counted a total of six 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 5 May '09

Minor Planet Electronic Circulars

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

MPEC 2009-J24 time-stamped "06:10 UT" - Daily Orbit Update - see below
MPEC 2009-J25 time-stamped "17:54 UT" - 2009 JE1 - see below
MPEC 2009-J26 time-stamped "18:00 UT" - 2009 JF1 - see below
MPEC 2009-J27 time-stamped "18:02 UT" - 2009 JG1

MPEC 2009-J27 - "18:02 UT" - 2009 JG1

K09J01G 2009 JG1 (H=20.7 ~245m) was discovered at 1421 UT on 4 May by the Siding Spring Survey (SSS), which observed it at May 4.60-63p4, 4.69p2, 5.52-53p2, and 5.59p2.

MPEC 2009-J26 - "18:00 UT" - 2009 JF1

K09J01F 2009 JF1 (risk-listed, Earth MOID=0.5 LD, H=27.1 ~13m) was discovered at 1005 UT on 4 May by the Mt. Lemmon Survey (MLS), which observed it at May 4.42-47p8. The discovery was confirmed by SSS (May 5.51-54p13 & 5.66p4). This object is now within ten lunar distances (LD) of Earth, reaching 1.2 LD on 6 May.

MPEC 2009-J25 - "17:54 UT" - 2009 JE1

K09J01E 2009 JE1 (risk-listed, Earth MOID=3.9 LD, H=26.8 ~15m) was discovered at 0846 UT on 4 May by MLS, which observed it at May 4.37-43p10. This object is now within ten lunar distances (LD) of Earth, reaching 5.1 LD on 9 May.

<< DOU on 5 May '09 >> MPEC 2009-J24 - "06:10 UT" - Daily Orbit Update

Observations of risk-listed objects
K09H82C 2009 HC82 (i=154.6°, Q=4.415 AU, arc=6 days, H=16.2 ~1.95 km) from the Spacewatch 1.8m telescope (May 5.19-20p3)
K09H58V 2009 HV58 (i=48.8°, arc=9 days, H=19.4 ~446m) from Spacewatch 1.8m (May 4.27p2)
K09H00C 2009 HC (small asteroid, arc=18 days, H=24.8 ~37m) from Spacewatch 1.8m (May 5.21-22p3)
Observations of recently (no longer) risk-listed objects
K09H82F 2009 HF82 (i=43.2°, arc=4 days, H=20.0 ~339m) from Spacewatch 1.8m (May 4.17p3)
K09H21L 2009 HL21 (small asteroid, arc=9 days, H=22.5 ~107m) from La Sagra Obs. (April 29.97-00p3)
Observations of small asteroids (H>22.0)
K09H82M 2009 HM82 (arc=4 days, H=22.6 ~102m) from Castelmartini Obs. (May 3.93p2), Doc Greiner Research Obs. (DGRO) (May 4.23-24p4), and the Catalina Sky Survey (CSS) (May 4.26-28p4)
Observations of other objects
K09H82E 2009 HE82 (arc=5 days, H=18.2 ~776m) from MLS (May 4.40-41p4)
K09H44V 2009 HV44 (i=37.9°, arc=12 days, H=19.0 ~537m) from Castelmartini Obs. (May 3.94p5), DGRO (May 4.24-25p11), and CSS (May 4.26-28p3)
K09D01F 2009 DF1 (arc=75 days, H=20.6 ~257m) from Mirasteilas Obs. (May 4.96-98p3)
K09C01Q 2009 CQ1 (arc=104 days, H=20.7 ~245m) from La Sagra Obs. (May 2.91-93p3) and Castelmartini Obs. (May 3.89p5)
K08W02N 2008 WN2 (arc=191 days, H=20.8 ~234m) from Eridanus Obs. (April 20.96-98p4 & 21.96-97p5) and La Sagra Obs. (April 29.99-04p9 & May 2.98-01p3)
K08J19V 2008 JV19 (arc=2 opp, H=20.7 ~245m) from CSS (May 4.39-41p4)
K07B02T 2007 BT2 (arc=3 opp, H=17.1 ~1.29 km) from Balzaretto Obs. (May 3.85p4)
K05YG5S 2005 YS165 (arc=2 opp, H=17.4 ~1.12 km) from CSS (May 4.31-32p4)
K01SS6G 2001 SG286 (arc=2 opp, H=20.8 ~234m) from SSS (April 15.75p1)
K7945 207945 1991 JW from Castelmartini Obs. (May 3.92p4) and Atlante Obs. (May 4.88p3)
I4990 184990 2006 KE89 from CSS (May 4.41-43p4)
F9399 159399 1998 UL1 from Mirasteilas Obs. (May 4.93-94p3)
F4993 154993 2005 EA94 from MLS (May 4.21-23p4)
E3947 143947 2003 YQ117 from La Sagra Obs. (May 1.94-96p3)
E3651 143651 2003 QO104 from Atlante Obs. (May 4.86-87p3)
D8911 138911 2001 AE2 from La Sagra Obs. (May 3.11-14p9)
D8883 138883 2000 YL29 from CSS (May 4.42-44p4)
90367 90367 2003 LC5 from Jaen Obs. (May 4.87-90p2)
88254 88254 2001 FM129 from SSS (May 4.65-68p2)
86666 86666 2000 FL10 from La Sagra Obs. (May 3.87-90p3)
40329 40329 1999 ML from La Sagra Obs. (April 30.03-06p3 & May 1.98-01p3)
27346 27346 2000 DN8 from the Spacewatch 0.9m telescope (May 4.45-47p3)
05604 5604 1992 FE from Eridanus Obs. (April 20.94-95p3 & 21.90-92p3)
04954 4954 Eric (1990 SQ) from SSS (May 4.65-68p4)

Observers on 5 May '09

Thirteen observing facilities appear in today's MPECs.

Code	Observer / observatory
`J51`	Atlante Obs. in the Canary Islands, 2 in MPEC 2009-J24 -- 207945, 143651
`A81`	Balzaretto Obs. in Italy, 1 in MPEC 2009-J24 -- 2007 BT2
`160`	Castelmartini Obs. in Italy, 4 in MPEC 2009-J24 -- 2009 HV44, 2009 HM82, 2009 CQ1, 207945
`703`	Catalina Sky Survey (CSS) in Arizona, 6 in MPEC 2009-J24 -- 2009 HV44, 2009 HM82, 2008 JV19, 2005 YS165, 184990, 138883
`H26`	Doc Greiner Research Obs. (DGRO) in Wisconsin, 2 in MPEC 2009-J24 -- 2009 HV44, 2009 HM82
`A27`	Eridanus Obs. in Germany, 2 in MPEC 2009-J24 -- 2008 WN2, 5604
`J28`	Jaen Obs. in Spain, 1 in MPEC 2009-J24 -- 90367
`J75`	La Sagra Obs. in Spain, 7 in MPEC 2009-J24 -- 2009 HL21, 2009 CQ1, 2008 WN2, 86666, 40329, 143947, 138911
`B67`	Mirasteilas Obs. in Switzerland, 2 in MPEC 2009-J24 -- 2009 DF1, 159399
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 4 in MPECs 2009-J24, 2009-J25 & 2009-J26 -- 2009 JF1, 2009 JE1, 2009 HE82, 154993
`E12`	Siding Spring Survey (SSS) in New South Wales, 5 in MPECs 2009-J24, 2009-J26 & 2009-J27 -- 2009 JG1, 2009 JF1, 2001 SG286, 88254, 4954
`691`	Spacewatch 0.9m telescope in Arizona, 1 in MPEC 2009-J24 -- 27346
`291`	Spacewatch 1.8m telescope in Arizona, 4 in MPEC 2009-J24 -- 2009 HV58, 2009 HF82, 2009 HC82, 2009 HC

For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.

Impact Risk Monitoring on 5 May '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 JF1	JPL Sentry	2000	2022	1	3.3e-04	-3.59	-3.59	0	JPL: "Analysis based on 25 observations spanning 1.2388 days (2009-May-04.42059 to 2009-May-05.659412)." Diameter approximately 0.013 km. from mean, weighted H=27.1.

2009 JE1	JPL Sentry	2200	2044-2100	9	3.3e-08	-8.84	-8.97	0	JPL: "Analysis based on 10 observations spanning .06837 days (2009-May-04.36574 to 2009-May-04.43411)." Diameter approximately 0.013 km. from mean, weighted H=27.1.

2009 HC82	JPL Sentry	1305	2012-2038	3	3.4e-09	-2.15	-2.16	0	JPL: "Analysis based on 26 observations spanning 5.8252 days (2009-Apr-29.37373 to 2009-May-05.19896)." Diameter approximately 1.900 km. from mean, weighted H=16.3.
2009 HC82	NEODyS	1305	2012-2022	2	2.57e-09	-2.23	-2.23	0	NEODyS: "Based on 27 optical observations (of which 1 are rejected as outliers) from 2009/04/29.374 to 2009/05/05.200."

2009 HV58	JPL Sentry	1305	2011-2105	9	2.5e-07	-3.61	-4.23	0	JPL: "Analysis based on 33 observations spanning 8.8764 days (2009-Apr-25.39439 to 2009-May-04.2708)." Diameter approximately 0.440 km. from mean, weighted H=19.4.
2009 HV58	NEODyS	1305	2011-2090	8	1.62e-07	-3.74	-4.29	0	NEODyS: "Based on 33 optical observations (of which 0 are rejected as outliers) from 2009/04/25.395 to 2009/05/04.272."

2009 HC	NEODyS	1400	2090	1	4.95e-08	-7.67	-7.67	0	NEODyS: "Based on 113 optical observations (of which 2 are rejected as outliers) from 2009/04/17.232 to 2009/05/05.217."
2009 HC	JPL Sentry	1305	2079-2098	6	2.1e-06	-6.08	-6.71	0	JPL: "Analysis based on 111 observations spanning 17.985 days (2009-Apr-17.23164 to 2009-May-05.21619)." Diameter approximately 0.036 km. from mean, weighted H=24.9.

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 5 May '09

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

2200	Noted that JPL Sentry has posted 2009 JE1 as an impact risk - see above
2000	Noted that JPL Sentry has posted 2009 JF1 as an impact risk - see above
1900	Grabbed MPEC 2009-J25 - 2009 JE1 - see above Grabbed MPEC 2009-J26 - 2009 JF1 - see above Grabbed MPEC 2009-J27 - 2009 JG1 - see above
1400	Noted that NEODyS has posted 2009 HC as an impact risk - see above
1306	Grabbed MPEC 2009-J24 - Daily Orbit Update - see above
1305	Noted that JPL Sentry has updated its 2009 HC risk assessment - see above Noted that JPL Sentry has updated its 2009 HC82 risk assessment - see above Noted that NEODyS has updated its 2009 HC82 risk assessment - see above Noted that JPL Sentry has updated its 2009 HV58 risk assessment - see above Noted that NEODyS has updated its 2009 HV58 risk assessment - see above

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