2009-04-30 Tracking News

Contents on 30 April '09

IAU Minor Planet Center
- NEOCP Activity -- twelve listings: 4 new, 8 updated
- New MPECs -- three MPECs
Observers -- thirteen observing facilities
Impact Risk Monitoring -- four 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 30 April '09

The MPC's NEO Confirmation Page has 12 listings: 4 new, 8 updated

When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had four new and eight updated listings. Of these, seven were "one nighters." So far The Tracking News has counted a total of fourteen 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 30 April '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-H81 time-stamped "06:10 UT" - Daily Orbit Update - see below
MPEC 2009-H82 time-stamped "14:06 UT" - 2009 HU77 - see below
MPEC 2009-H83 time-stamped "14:09 UT" - 2009 HV77

MPEC 2009-H83 - "14:09 UT" - 2009 HV77

K09H77V 2009 HV77 (H=20.6 ~257m) was discovered at 2238 UT on 29 April by La Sagra Obs., which observed it at April 29.94-97p3 and 30.11-13p3. The discovery was confirmed by the Mt. Lemmon Survey (MLS) (April 20.36-38p4 & 27.30-32p4).

MPEC 2009-H82 - "14:06 UT" - 2009 HU77

K09H77U 2009 HU77 (small asteroid, H=23.4 ~71m) was discovered at 0621 UT on 29 April by the Catalina Sky Survey (CSS), which observed it at April 29.26-29p4 and 29.34-37p3. The discovery was confirmed by the Siding Spring Survey (SSS) (April 29.61p2) and MLS (April 30.33-36p4).

<< DOU on 30 Apr. '09 >> MPEC 2009-H81 - "06:10 UT" - Daily Orbit Update

Observations of risk-listed objects
K09H73M 2009 HM73 (small asteroid, arc=2 days, H=23.0 ~85m) from MLS (April 29.31-33p4) and the Spacewatch 1.8m telescope (April 30.21-22p3)
K09H67W 2009 HW67 (small asteroid, arc=3 days, H=26.1 ~20m) from Spacewatch 1.8m (April 29.24-25p3 & 30.22-23p3)
K09H58V 2009 HV58 (i=42.7°, arc=4 days, H=19.6 ~407m) from Spacewatch 1.8m (April 29.37-38p3)
K09H00C 2009 HC (small asteroid, arc=12 days, H=24.8 ~37m) from Spacewatch 1.8m (April 29.27-28p2)
Observations of recently (no longer) risk-listed objects
K09H51X 2009 HX51 (arc=7 days, H=21.1 ~204m) from Spacewatch 1.8m (April 30.18-19p3)
K09H21L 2009 HL21 (small asteroid, arc=8 days, H=22.5 ~107m) from the Spacewatch 0.9m telescope (April 29.14-18p3)
Observations of small asteroids (H>22.0)
K09H73K 2009 HK73 (arc=0 days, H=26.3 ~19m) from Bisei Spaceguard Center (April 29.61p4) and SSS (April 29.62p4)
K09H60G 2009 HG60 (arc=2 days, H=22.7 ~98m) from Walnut Creek Obs. (April 29.27-28p3)
K09F44H 2009 FH44 (arc=30 days, H=22.7 ~98m) from Spacewatch 1.8m (April 29.26p3 & 30.16-17p3)
Observations of other objects
K09H51Y 2009 HY51 (arc=6 days, H=20.7 ~245m) from Spacewatch 1.8m (April 29.32p2) and Spacewatch 0.9m (April 29.36-39p2)
K09H44V 2009 HV44 (i=37.6°, arc=8 days, H=18.9 ~562m) from Hamamatsu-Yuto Obs. (April 29.73-75p8) and El Condor Obs. (April 30.16-17p3)
K09H00B 2009 HB (arc=13 days, H=18.0 ~851m) from CSS (April 29.26-29p4)
K09F19F 2009 FF19 (arc=39 days, H=21.3 ~186m) from MLS (April 29.20-23p4)
K09D47E 2009 DE47 (arc=60 days, H=18.8 ~589m) from Hamamatsu-Yuto Obs. (April 29.64-66p5)
K09D01L 2009 DL1 (arc=70 days, H=18.9 ~562m) from El Condor Obs. (April 30.12-15p3)
K08Y27S 2008 YS27 (arc=122 days, H=21.1 ~204m) from Spacewatch 1.8m (April 30.14-15p3)
K08W60L 2008 WL60 (arc=157 days, H=18.0 ~851m) from Walnut Creek Obs. (April 29.23p3) and Hamamatsu-Yuto Obs. (April 29.66-69p7)
K08SF0W 2008 SW150 (arc=2 opp, H=19.4 ~446m) from MLS (April 29.27-30p4)
K08S11V 2008 SV11 (Q=4.511 AU, arc=2 opp, H=18.4 ~708m) from Hamamatsu-Yuto Obs. (April 29.57-60p6)
K07B02T 2007 BT2 (arc=3 opp, H=17.1 ~1.29 km) from Hamamatsu-Yuto Obs. (April 29.51-54p7)
K05S71A 2005 SA71 (arc=3 opp, H=18.7 ~616m) from Spacewatch 0.9m (April 29.15-18p3)
K02L38T 2002 LT38 (arc=2 opp, H=20.0 ~339m) from Zadko Obs. (April 28.72p1 & 28.82p2)
K02H08F 2002 HF8 (arc=3 opp, H=18.4 ~708m) from MLS (April 29.24-26p4)
H7614 177614 2004 HK33 from Bigmuskie Obs. (April 29.87-90p2)
D6874 136874 1998 FH74 from Spacewatch 0.9m (April 29.14-18p3)
D6617 136617 1994 CC from El Condor Obs. (April 30.09-11p3)
A8519 108519 2001 LF from Boambee Obs. (April 28.39p1, 28.44p1 & 29.48-52p3)
39557 39557 Gielgud (1992 JG) from MLS (April 29.27-30p4)
35396 35396 1997 XF11 from CSS (April 29.21-23p4)
08035 8035 1992 TB from CSS (April 29.47-48p3)
05604 5604 1992 FE from CSS (April 29.16-17p4)
03199 3199 Nefertiti (1982 RA) from Boambee Obs. (April 27.41-43p2, 28.36-40p3, 29.48p1 & 29.53p2)
01036 1036 Ganymed (1924 TD) from El Condor Obs. (April 30.01-04p3)

Observers on 30 April '09

Thirteen observing facilities appear in today's MPECs.

Code	Observer / observatory
`B88`	Bigmuskie Obs. in Italy, 1 in MPEC 2009-H81 -- 177614
`300`	Bisei Spaceguard Center in Japan, 1 in MPEC 2009-H81 -- 2009 HK73
`432`	Boambee Obs. in New South Wales, 2 in MPEC 2009-H81 -- 108519, 3199
`703`	Catalina Sky Survey (CSS) in Arizona, 5 in MPECs 2009-H81 & 2009-H82 -- 2009 HU77, 2009 HB, 35396, 8035, 5604
`I21`	El Condor Obs. in Argentina, 4 in MPEC 2009-H81 -- 2009 HV44, 2009 DL1, 136617, 1036
`379`	Hamamatsu-Yuto Obs. in Japan, 5 in MPEC 2009-H81 -- 2009 HV44, 2009 DE47, 2008 WL60, 2008 SV11, 2007 BT2
`J75`	La Sagra Obs. in Spain, 1 in MPEC 2009-H83 -- 2009 HV77
`G96`	Mt. Lemmon Survey (MLS) in Arizona, 7 in MPECs 2009-H81, 2009-H82 & 2009-H83 -- 2009 HV77, 2009 HU77, 2009 HM73, 2009 FF19, 2008 SW150, 2002 HF8, 39557
`E12`	Siding Spring Survey (SSS) in New South Wales, 2 in MPECs 2009-H81 & 2009-H82 -- 2009 HU77, 2009 HK73
`691`	Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2009-H81 -- 2009 HY51, 2009 HL21, 2005 SA71, 136874
`291`	Spacewatch 1.8m telescope in Arizona, 8 in MPEC 2009-H81 -- 2009 HY51, 2009 HX51, 2009 HW67, 2009 HV58, 2009 HM73, 2009 HC, 2009 FH44, 2008 YS27
`G56`	Walnut Creek Obs. in northern California, 2 in MPEC 2009-H81 -- 2009 HG60, 2008 WL60
`D20`	Zadko Obs. in Western Australia, 1 in MPEC 2009-H81 -- 2002 LT38

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

Impact Risk Monitoring on 30 April '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 HM73	JPL Sentry	1327	2066	1	3.2e-10	-8.52	-8.52	0	JPL: "Analysis based on 20 observations spanning 1.8418 days (2009-Apr-28.37383 to 2009-Apr-30.21564)." Diameter approximately 0.096 km. from mean, weighted H=22.7.
2009 HM73	NEODyS	1327	2086	1	4.3e-11	-9.68	-9.68	0	NEODyS: "Based on 20 optical observations (of which 0 are rejected as outliers) from 2009/04/28.375 to 2009/04/30.216."

2009 HW67	JPL Sentry	1327	2046-2079	4	1.3e-06	-6.17	-6.51	0	JPL: "Analysis based on 26 observations spanning 2.9325 days (2009-Apr-27.29601 to 2009-Apr-30.22847)." Diameter approximately 0.020 km. from mean, weighted H=26.1.
2009 HW67	NEODyS	1327	2046-2079	6	1.51e-06	-6.08	-6.43	0	NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2009/04/27.297 to 2009/04/30.229."

2009 HV58	JPL Sentry	1327	2011-2108	45	5.5e-08	-3.33	-3.49	0	JPL: "Analysis based on 23 observations spanning 3.9831 days (2009-Apr-25.39439 to 2009-Apr-29.37752)." Diameter approximately 0.451 km. from mean, weighted H=19.4.
2009 HV58	NEODyS	1327	2011-2090	41	3.74e-08	-3.39	-3.49	0	NEODyS: "Based on 23 optical observations (of which 0 are rejected as outliers) from 2009/04/25.395 to 2009/04/29.378."

2009 HC	JPL Sentry	1327	2097-2099	5	1.0e-06	-6.40	-6.93	0	JPL: "Analysis based on 99 observations spanning 12.045 days (2009-Apr-17.23164 to 2009-Apr-29.2771)." 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 30 April '09

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

1433

Grabbed MPEC 2009-H82 - 2009 HU77 - see above
Grabbed MPEC 2009-H83 - 2009 HV77 - see above

1327

Noted that JPL Sentry has updated its 2009 HC risk assessment - see above
Noted that JPL Sentry has updated its 2009 HM73 risk assessment - see above
Noted that NEODyS has posted 2009 HM73 as an impact risk - see above
Noted that JPL Sentry has posted 2009 HV58 as an impact risk - see above
Noted that NEODyS has updated its 2009 HV58 risk assessment - see above
Noted that JPL Sentry has updated its 2009 HW67 risk assessment - see above
Noted that NEODyS has updated its 2009 HW67 risk assessment - see above
Grabbed MPEC 2009-H81 - Daily Orbit Update - see above

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