All remaining impact solutions were removed today for highly unusual object 2009 HC82. Discovered April 29th by the Catalina Sky Survey, it was posted as a risk on May 4th following observations reported that morning from Peter Birtwhistle in England (including the frames stacked into this image, note the faint dot at center). 2009 HC82 is large for an NEO, and possibly larger yet if it is an inactive comet nucleus, as suggested by its retrograde orbit. Image ©copyright 2009 Great Shefford Observatory. See more info.
Contents on 6 May '09
- IAU Minor Planet Center
- NEOCP Activity -- one listing: 1 updated
- New MPECs -- four MPECs
- Observers -- thirteen observing facilities
- Impact Risk Monitoring -- three 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 6 May '09
The MPC's NEO Confirmation Page has 1 listing: 1 updated
When last checked at 2344 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had one updated listing. This was a "one nighter." 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 6 May '09
Minor Planet Electronic Circulars
As of last check at 2344 UTC, there have been four MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2009-J28 time-stamped "06:08 UT" - Daily Orbit Update - see below
- MPEC 2009-J29 time-stamped "18:19 UT" - 2009 JK1 - see below
- MPEC 2009-J30 time-stamped "18:26 UT" - 2009 JL1 - see below
- MPEC 2009-J31 time-stamped "18:30 UT" - 2009 JM1
MPEC 2009-J31 - "18:30 UT" - 2009 JM1
- K09J01M 2009 JM1 (small asteroid, Earth MOID=7.1 LD, H=23.3 ~74m) was discovered at 1112 UT on 5 May by the Spacewatch 1.8m telescope, which observed it at May 5.47p3, 6.26-36p11, and 6.45p2. The discovery was confirmed by the Spacewatch 0.9m telescope (May 5.41-43p2), the Siding Spring Survey (SSS) (May 6.66p2), and Faulkes Telescope South (May 6.66p3).
MPEC 2009-J30 - "18:26 UT" - 2009 JL1
- K09J01L 2009 JL1 (H=21.2 ~195m) was discovered at 0923 UT on 5 May by Spacewatch 0.9m, which observed it at May 5.39-43p3. The discovery was confirmed by the Mt. Lemmon Survey (MLS) (April 17.45-47p4), Spacewatch 1.8m (May 5.47p3, 6.29-34p6, 6.38-39p3 & 6.43-44p3), and Faulkes South (May 6.66p2).
MPEC 2009-J29 - "18:19 UT" - 2009 JK1
- K09J01K 2009 JK1 (H=19.5 ~426m) was discovered at 0916 UT on 5 May by Spacewatch 0.9m, which observed it at April 29.36-40p3, May 1.39-42p3, and 5.39-42p3. The discovery was confirmed by MLS (March 19.45-48p4) and Spacewatch 1.8m (May 6.24-25p3).
<< DOU on 6 May '09 >> MPEC 2009-J28 - "06:08 UT" - Daily Orbit Update
- Observations of risk-listed objects
- K09H82C 2009 HC82 (i=154.5°, Q=4.503 AU, arc=7 days, H=16.2 ~1.95 km) from Spacewatch 1.8m (May 6.22-23p3)
- K09H58V 2009 HV58 (i=47.8°, arc=10 days, H=19.5 ~426m) from Spacewatch 1.8m (May 5.46p1)
- Observations of recently (no longer) risk-listed objects
- K09H73M 2009 HM73 (small asteroid, arc=7 days, H=23.0 ~85m) from Spacewatch 1.8m (May 5.37-38p3)
- K09H21D 2009 HD21 (Q=4.669 AU, arc=42 days, H=18.0 ~851m) from Astronomical Research Obs. (ARO) (May 5.12-13p3)
- Observations of small asteroids (H>22.0)
- K09H82M 2009 HM82 (arc=6 days, H=22.6 ~102m) from Castelmartini Obs. (May 5.97p3)
- K09H60G 2009 HG60 (arc=8 days, H=22.7 ~98m) from ARO (May 5.14-15p4)
- Observations of other objects
- K09J01G 2009 JG1 (arc=1 day, H=20.8 ~234m) from SSS (May 5.74p1)
- K09J00R 2009 JR (arc=2 days, H=21.2 ~195m) from ARO (May 5.13-14p3)
- K09H88F 2009 HF88 (arc=5 days, H=19.6 ~407m) from Spacewatch 1.8m (May 5.39-40p2)
- K09H82D 2009 HD82 (arc=11 days, H=21.6 ~162m) from Spacewatch 0.9m (May 5.38-40p2)
- K09H67Y 2009 HY67 (i=36.7°, arc=4 days, H=21.7 ~155m) from Spacewatch 0.9m (May 1.35-37p2)
- K09H44V 2009 HV44 (i=38.0°, arc=14 days, H=18.9 ~562m) from Atlante Obs. (May 5.96-97p3) and Castelmartini Obs. (May 5.97p4)
- K09C02R 2009 CR2 (Q=5.036 AU, arc=91 days, H=16.7 ~1.55 km) from ARO (May 5.09p3)
- K09B02L 2009 BL2 (arc=107 days, H=19.3 ~467m) from ARO (May 5.10p2)
- K08W60L 2008 WL60 (arc=164 days, H=18.0 ~851m) from Doc Greiner Research Obs. (DGRO) (May 6.10p3)
- K07B02T 2007 BT2 (arc=3 opp, H=17.1 ~1.29 km) from ARO (May 5.13-14p3)
- K06UL6R 2006 UR216 (arc=2 opp, H=19.7 ~389m) from SSS (May 5.71-73p4)
- K05S71A 2005 SA71 (arc=3 opp, H=18.7 ~616m) from Spacewatch 0.9m (May 4.17-19p2)
- K00T02G 2000 TG2 (arc=4 opp, H=19.7 ~389m) from Spacewatch 0.9m (May 1.27-28p2)
- K7945 207945 1991 JW from Atlante Obs. (May 5.99-00p3)
- F9399 159399 1998 UL1 from Castelmartini Obs. (May 5.98p3) and Atlante Obs. (May 6.05-06p3)
- E3651 143651 2003 QO104 from Washington D.C. Obs. (April 18.10p1, 18.17p1, 27.11p1 & 27.19p1) and Castelmartini Obs. (May 5.86p3)
- D8911 138911 2001 AE2 from Purple Mtn. Obs. XuYi Station (XuYi Sta.) (May 5.72-76p4)
- D8883 138883 2000 YL29 from Castelmartini Obs. (May 5.95-96p3) and Atlante Obs. (May 6.03-04p3)
- D6874 136874 1998 FH74 from Spacewatch 0.9m (May 1.16-18p2)
- 99799 99799 2002 LJ3 from Spacewatch 0.9m (May 4.36-40p2)
- 90367 90367 2003 LC5 from Jaen Obs. (May 5.88-90p2)
- 85989 85989 1999 JD6 from Castelmartini Obs. (May 5.98-99p2)
- 05879 5879 Almeria (1992 CH1) from Spacewatch 0.9m (May 1.45-46p2 & 5.44-47p3)
- 05620 5620 Jasonwheeler (1990 OA) from XuYi Sta. (May 5.67-71p4) and Atlante Obs. (May 6.08-09p3)
- 03103 3103 Eger (1982 BB) from Andrushivka Obs. (April 28.89-90p3 & 28.95p1)
Observers on 6 May '09
Thirteen observing facilities appear in today's MPECs.
| Code | Observer / observatory |
|---|---|
| A50 | Andrushivka Obs. in the Ukraine, 1 in MPEC 2009-J28 -- 3103 |
| H55 | Astronomical Research Obs. (ARO) in Illinois, 6 in MPEC 2009-J28 -- 2009 JR, 2009 HG60, 2009 HD21, 2009 CR2, 2009 BL2, 2007 BT2 |
| J51 | Atlante Obs. in the Canary Islands, 5 in MPEC 2009-J28 -- 2009 HV44, 207945, 159399, 138883, 5620 |
| 160 | Castelmartini Obs. in Italy, 6 in MPEC 2009-J28 -- 2009 HV44, 2009 HM82, 85989, 159399, 143651, 138883 |
| H26 | Doc Greiner Research Obs. in Wisconsin, 1 in MPEC 2009-J28 -- 2008 WL60 |
| E10 | Faulkes Telescope South in New South Wales, 2 in MPECs 2009-J30 & 2009-J31 -- 2009 JM1, 2009 JL1 |
| J28 | Jaen Obs. in Spain, 1 in MPEC 2009-J28 -- 90367 |
| G96 | Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2009-J29 & 2009-J30 -- 2009 JL1, 2009 JK1 |
| D29 | Purple Mtn. Obs. XuYi Station (XuYi Sta.) in China, 2 in MPEC 2009-J28 -- 138911, 5620 |
| E12 | Siding Spring Survey (SSS) in New South Wales, 3 in MPECs 2009-J28 & 2009-J31 -- 2009 JM1, 2009 JG1, 2006 UR216 |
| 691 | Spacewatch 0.9m telescope in Arizona, 10 in MPECs 2009-J28, 2009-J29, 2009-J30 & 2009-J31 -- 2009 JM1, 2009 JL1, 2009 JK1, 2009 HY67, 2009 HD82, 2005 SA71, 2000 TG2, 99799, 136874, 5879 |
| 291 | Spacewatch 1.8m telescope in Arizona, 7 in MPECs 2009-J28, 2009-J29, 2009-J30 & 2009-J31 -- 2009 JM1, 2009 JL1, 2009 JK1, 2009 HV58, 2009 HM73, 2009 HF88, 2009 HC82 |
| I13 | Washington D.C. Obs. in Washington, D.C., 1 in MPEC 2009-J28 -- 143651 |
| For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page. | |
Impact Risk Monitoring on 6 May '09
| 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 | NEODyS | 1349 | 2022 | 1 | 3.14e-04 | -3.60 | -3.60 | 0 | NEODyS: "Based on 25 optical observations (of which 0 are rejected as outliers) from 2009/05/04.421 to 2009/05/05.660." |
| 2009 HC82 | JPL Sentry | 1349 | R E M O V E D | JPL: Risk listing removed at 0854 UTC. | |||||
| NEODyS | 1349 | R E M O V E D | - | ||||||
| 2009 HV58 | JPL Sentry | 1349 | 2011-2093 | 5 | 3.7e-08 | -4.45 | -5.01 | 0 | JPL: "Analysis based on 34 observations spanning 10.061 days (2009-Apr-25.39439 to 2009-May-05.45527)." Diameter approximately 0.440 km. from mean, weighted H=19.4. |
| NEODyS | 1349 | 2011-2090 | 6 | 2.95e-08 | -4.50 | -4.94 | 0 | NEODyS: "Based on 34 optical observations (of which 0 are rejected as outliers) from 2009/04/25.395 to 2009/05/05.456." | |
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 6 May '09
Times are UTC for when items were noted or added by The Tracking News.
| 1900 | Grabbed MPEC 2009-J29 - 2009 JK1 - see above Grabbed MPEC 2009-J30 - 2009 JL1 - see above Grabbed MPEC 2009-J31 - 2009 JM1 - see above |
| 1349 | Noted that JPL Sentry has removed 2009 HC82 as an impact risk - see above Noted that NEODyS has removed 2009 HC82 as an impact risk - 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 Noted that NEODyS has posted 2009 JF1 as an impact risk - see above Grabbed MPEC 2009-J28 - Daily Orbit Update - see above |
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