Contents on 26 April '09
- IAU Minor Planet Center
- NEOCP Activity -- three listings: 3 updated
- New MPECs -- five MPECs
- Observers -- 22 observing facilities
- Impact Risk Monitoring -- two 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 26 April '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. Of these, two were "one nighters." So far The Tracking News has counted a total of nine 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 26 April '09
Minor Planet Electronic Circulars
As of last check at 2358 UTC, there have been five MPECs posted today from the International Astronomical Union's Minor Planet Center in Cambridge, Massachusetts.
- MPEC 2009-H55 time-stamped "06:09 UT" - Daily Orbit Update - see below
- MPEC 2009-H56 time-stamped "16:41 UT" - Comet C/2001 D1 = 2004 X7 = 2008 S2 = 1997 J6 (SOHO) - see below
- MPEC 2009-H57 time-stamped "22:18 UT" - 2009 HT58 - see below
- MPEC 2009-H58 time-stamped "22:21 UT" - 2009 HU58 - see below
- MPEC 2009-H59 time-stamped "22:23 UT" - 2009 HV58
MPEC 2009-H59 - "22:23 UT" - 2009 HV58
- K09H58V 2009 HV58 (i=44.4°, H=19.5 ~426m) was discovered at 0927 UT on 25 April by the Mt. Lemmon Survey (MLS), which observed it at April 25.39-49p16 and 26.41-43p4.
MPEC 2009-H58 - "22:21 UT" - 2009 HU58
- K09H58U 2009 HU58 (i=36.3°, q=0.186 AU, Q=4.135 AU, H=18.9 ~562m) was discovered at 0555 UT on 25 April by the Catalina Sky Survey (CSS), which observed it at April 25.25-26p4, 25.38p2, and 26.27p4. The discovery was confirmed by Modra Obs. (April 25.83-84p2), Bergen-Enkheim Obs. (April 25.86-89p3), Drebach Obs. (April 25.87-90p4), Great Shefford Obs. (April 25.89p3), Guidestar Obs. (April 25.89-92p3), Remanzacco Obs. (April 25.96p2), Jim Young via Table Mtn. Obs. (April 26.32-34p4), and Dave Balam via Plaskett 1.8m Telescope (April 26.33-34p3).
MPEC 2009-H57 - "22:18 UT" - 2009 HT58
- K09H58T 2009 HT58 (small asteroid, H=25.2 ~31m) was discovered at 0501 UT on 24 April by MLS, which observed it at April 24.21-27p8, 24.35p4, 24.40p4, 25.19p3, and 26.26-28p3. The discovery was confirmed by Sabino Canyon Obs. (April 24.32-33p3), Great Shefford Obs. (April 25.90-91p3), the Spacewatch 1.8m telescope (April 26.19p2), and Young/Table Mtn. (April 26.27-29p4).
MPEC 2009-H56 - "16:41 UT" - Comet C/2001 D1 = 2004 X7 = 2008 S2 = 1997 J6 (SOHO)
- CJ97J060 C/1997 J6 from the LASCO Coronagraph 2 aboard the Solar & Heliospheric Obs. (SOHO) (1997 May 1.92-98p6)
<< DOU on 26 Apr. '09 >> MPEC 2009-H55 - "06:09 UT" - Daily Orbit Update
- Observations of risk-listed objects
- K09H51X 2009 HX51 (arc=2 days, H=21.2 ~195m) from Spacewatch 1.8m (April 25.43-44p3)
- K09H00C 2009 HC (small asteroid, arc=9 days, H=24.8 ~37m) from Schiaparelli Obs. (April 21.99-00p3) and Naef Obs. (April 25.89-91p2)
- Observations of small asteroids (H>22.0)
- K09H21B 2009 HB21 (i=39.6°, arc=6 days, H=22.9 ~89m) from Schiaparelli Obs. (April 22.01-02p2) and Great Shefford Obs. (April 26.05-07p3)
- K09H00D 2009 HD (arc=8 days, H=22.7 ~98m) from Schiaparelli Obs. (April 21.98p5)
- Observations of other objects
- K09H44V 2009 HV44 (i=38.1°, arc=4 days, H=18.9 ~562m) from Bisei Spaceguard Center (April 23.65p5) and Great Shefford Obs. (April 26.12p3)
- K09C02R 2009 CR2 (Q=5.036 AU, arc=81 days, H=16.7 ~1.55 km) from CSS (April 25.22-24p7)
- K09C01Q 2009 CQ1 (arc=93 days, H=20.7 ~245m) from Schiaparelli Obs. (April 22.05-07p5)
- K08S11V 2008 SV11 (Q=4.511 AU, arc=2 opp, H=18.4 ~708m) from Castelmartini Obs. (April 24.99-00p3)
- K08J19V 2008 JV19 (arc=2 opp, H=20.7 ~245m) from CSS (April 25.27-29p4)
- K07B02T 2007 BT2 (arc=3 opp, H=17.1 ~1.29 km) from Schonfeld Obs. (April 24.88-92p3)
- K02E06L 2002 EL6 (arc=3 opp, H=18.0 ~851m) from Schiaparelli Obs. (April 22.13-14p3)
- K00F01L 2000 FL1 (i=43.6°, Q=4.177 AU, arc=2 opp, H=15.4 ~2.82 km, q=1.291 AU) from CSS (April 25.38-40p4)
- H7614 177614 2004 HK33 from Purple Mtn. Obs. XuYi Station (XuYi Sta.) (April 25.57-61p4)
- H5706 175706 1996 FG3 from Thompsonville Obs. (April 26.18-19p6)
- E3651 143651 2003 QO104 from Foerster Obs. (April 18.91-94p5) and Cyclops Obs. (April 24.91-93p4)
- 90367 90367 2003 LC5 from Naef Obs. (April 25.91p1)
- 37655 37655 Illapa (1994 PM) from CSS (April 25.38-40p4)
- 05604 5604 1992 FE from Thompsonville Obs. (April 26.20-21p6)
- 05011 5011 Ptah (6743 P-L) from Thompsonville Obs. (April 26.16-18p6)
- 03554 3554 Amun (1986 EB) from Thompsonville Obs. (April 26.13-14p6)
Observers on 26 April '09
A total of 22 observing facilities appear in today's MPECs.
| Code | Observer / observatory |
|---|---|
| A74 | Bergen-Enkheim Obs. in Germany, 1 in MPEC 2009-H58 -- 2009 HU58 |
| 300 | Bisei Spaceguard Center in Japan, 1 in MPEC 2009-H55 -- 2009 HV44 |
| 160 | Castelmartini Obs. in Italy, 1 in MPEC 2009-H55 -- 2008 SV11 |
| 703 | Catalina Sky Survey (CSS) in Arizona, 5 in MPECs 2009-H55 & 2009-H58 -- 2009 HU58, 2009 CR2, 2008 JV19, 2000 FL1, 37655 |
| B84 | Cyclops Obs. in The Netherlands, 1 in MPEC 2009-H55 -- 143651 |
| 113 | Drebach Obs. in Germany, 1 in MPEC 2009-H58 -- 2009 HU58 |
| 544 | Foerster Obs. in Germany, 1 in MPEC 2009-H55 -- 143651 |
| J95 | Great Shefford Obs. in England, 4 in MPECs 2009-H55, 2009-H57 & 2009-H58 -- 2009 HV44, 2009 HU58, 2009 HT58, 2009 HB21 |
| A17 | Guidestar Obs. in Germany, 1 in MPEC 2009-H58 -- 2009 HU58 |
| 118 | Modra Obs. in Slovakia, 1 in MPEC 2009-H58 -- 2009 HU58 |
| G96 | Mt. Lemmon Survey (MLS) in Arizona, 2 in MPECs 2009-H57 & 2009-H59 -- 2009 HV58, 2009 HT58 |
| A13 | Naef Obs. in Switzerland, 2 in MPEC 2009-H55 -- 2009 HC, 90367 |
| 6581 | Dave Balam via Plaskett 1.8m Telescope in British Columbia, 1 in MPEC 2009-H58 -- 2009 HU58 |
| D29 | Purple Mtn. Obs. XuYi Station in China, 1 in MPEC 2009-H55 -- 177614 |
| 473 | Remanzacco Obs. in Italy, 1 in MPEC 2009-H58 -- 2009 HU58 |
| 854 | Sabino Canyon Obs. in Arizona, 1 in MPEC 2009-H57 -- 2009 HT58 |
| 204 | Schiaparelli Obs. in Italy, 5 in MPEC 2009-H55 -- 2009 HD, 2009 HC, 2009 HB21, 2009 CQ1, 2002 EL6 |
| B76 | Schonfeld Obs. in Germany, 1 in MPEC 2009-H55 -- 2007 BT2 |
| 2492 | LASCO Coronagraph 2 aboard the Solar & Heliospheric Obs. in Earth-Sun L1 HALO orbit, 1 in MPEC 2009-H56 -- C/1997 J6 |
| 291 | Spacewatch 1.8m telescope in Arizona, 2 in MPECs 2009-H55 & 2009-H57 -- 2009 HX51, 2009 HT58 |
| 6735 | Jim Young via Table Mtn. Obs. in southern California, 2 in MPECs 2009-H57 & 2009-H58 -- 2009 HU58, 2009 HT58 |
| H53 | Thompsonville Obs. in Illinois, 4 in MPEC 2009-H55 -- 175706, 5604, 5011, 3554 |
| For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page. | |
Impact Risk Monitoring on 26 April '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 HX51 | JPL Sentry | 1501 | R E M O V E D | JPL: Risk listing removed at 0850 UTC. | |||||
| NEODyS | 1501 | R E M O V E D | - | ||||||
| 2009 HC | JPL Sentry | 1501 | 2095-2097 | 5 | 1.1e-06 | -6.36 | -6.83 | 0 | JPL: "Analysis based on 76 observations spanning 8.6735 days (2009-Apr-17.23164 to 2009-Apr-25.90511)." 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 26 April '09
Times are UTC for when items were noted or added by The Tracking News.
| 2302 | Grabbed MPEC 2009-H57 - 2009 HT58 - see above Grabbed MPEC 2009-H58 - 2009 HU58 - see above Grabbed MPEC 2009-H59 - 2009 HV58 - see above |
| 1702 | Grabbed MPEC 2009-H56 - Comet C/2001 D1 = 2004 X7 = 2008 S2 = 1997 J6 (SOHO) - see above |
| 1501 | Noted that JPL Sentry has updated its 2009 HC risk assessment - see above Noted that JPL Sentry has removed 2009 HX51 as an impact risk - see above Noted that NEODyS has removed 2009 HX51 as an impact risk - see above Grabbed MPEC 2009-H55 - Daily Orbit Update - see above |
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