Contents on 26 April '10
- IAU Minor Planet Center
- Observers -- twelve observing facilities
- Impact Risk Monitoring -- two objects
- Consolidated Risk Tables - the CRT page
- Earth's Busy Neighborhood Traffic Report
- Ephemerides for risk-rated and nearby objects
- News image catalog
- Old & new CRT Archive
- Old News Archive & Small Objects Archive
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 '10
The MPC's NEO Confirmation Page has 11 listings: 6 new, 5 updated
When last checked at 2358 UTC today, the Minor Planet Center's Near Earth Object discovery Confirmation Page (NEOCP) had six new and five updated listings. Of these, six were "one nighters." So far The Tracking News has counted a total of sixteen 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 '10
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 2010-H63 time-stamped "06:12 UT" - Daily Orbit Update - see below
- MPEC 2010-H64 time-stamped "16:10 UT" - 2010 HV20 - see below
- MPEC 2010-H65 time-stamped "16:24 UT" - 2010 HW20
MPEC 2010-H65 - "16:24 UT" - 2010 HW20
- K10H20W 2010 HW20 (small asteroid, Earth MOID=4.2 LD, H=26.1 ~20m) was discovered at 1026 UT on 25 April by the Mt. Lemmon Survey (MLS), which observed it at April 25.43-49p11, 26.32p5, and 26.44p4. The discovery was confirmed by Magdalena Ridge Obs. (MRO) (April 25.47-48p2). This object will be coming within ten lunar distances (LD) of Earth, reaching 9.9 LD on 29 April.
MPEC 2010-H64 - "16:10 UT" - 2010 HV20
- K10H20V 2010 HV20 (risk-listed, Q=4.747 AU, H=21.9 ~141m) was discovered at 0845 UT on 25 April by MLS, which observed it at April 25.36-40p8, 25.46p4, 26.32p5, and 26.44p3. The discovery was confirmed by MRO (April 25.42-46p5), Rodeo Obs. (April 25.44-45p3 & 26.47p7), Tenagra II Obs. (April 25.48p2 & 26.32p3), and Modra Obs. (April 26.05-06p2).
- Observations of recently (no longer) risk-listed objects
- K10H20G 2010 HG20 (arc=5 days, H=21.3 ~186m) from Tenagra II Obs. (April 24.44p2 & 25.46p1), the Spacewatch 1.8m telescope (April 25.37p3), and MLS (April 25.43-45p4)
- K10G35E 2010 GE35 (small asteroid, arc=14 days, H=23.0 ~85m) from Great Shefford Obs. (April 25.88p3)
- K10G07T 2010 GT7 (Q=4.608 AU, arc=18 days, H=20.2 ~309m) from Desert Moon Obs. (April 25.25-28p3) and Rodeo Obs. (April 25.46p5)
- K10G07S 2010 GS7 (Q=4.472 AU, arc=19 days, H=21.5 ~170m) from Walnut Creek Obs. (April 26.19p3)
- Observations of small asteroids (H>22.0)
- K10H00F 2010 HF (arc=6 days, H=26.2 ~19m) from Tenagra II Obs. (April 24.46p2)
- K10F81A 2010 FA81 (arc=27 days, H=22.2 ~123m) from the Spacewatch 0.9m telescope (April 25.34-35p3)
- Observations of other objects
- K10G75R 2010 GR75 (arc=12 days, H=19.6 ~407m) from Tenagra II Obs. (April 24.45-46p3), Desert Moon Obs. (April 25.30-33p3), Spacewatch 0.9m (April 25.30p2), and Rodeo Obs. (April 25.47p2)
- K10G62W 2010 GW62 (arc=15 days, H=19.3 ~467m) from Tenagra II Obs. (April 24.47-48p3) and Spacewatch 0.9m (April 25.32p3)
- K10G33O 2010 GO33 (Q=4.089 AU, arc=14 days, H=19.1 ~513m) from Desert Moon Obs. (April 25.18-22p3)
- K10G21U 2010 GU21 (arc=21 days, H=21.0 ~214m) from Atlante Obs. (April 25.95-97p3)
- K10F81H 2010 FH81 (arc=25 days, H=21.7 ~155m) from MRO (April 25.45-47p4)
- K10E45V 2010 EV45 (arc=41 days, H=19.8 ~371m) from Desert Moon Obs. (April 25.36-38p3)
- K09J02O 2009 JO2 (arc=2 opp, H=19.3 ~467m) from Tenagra II Obs. (April 24.48-49p3)
- K05GC0B 2005 GB120 (arc=2 opp, H=20.6 ~257m) from Desert Moon Obs. (April 25.45-47p3)
- K00H74D 2000 HD74 (i=49.2°, Q=4.664 AU, arc=3 opp, H=18.0 ~851m) from Bergen-Enkheim Obs. (April 24.99-05p4)
- L8017 218017 2001 XV266 from Spacewatch 0.9m (April 25.43-47p3)
- 85839 85839 1998 YO4 from Atlante Obs. (April 25.90-92p3)
Observers on 26 April '10
Twelve observing facilities appear in today's MPECs.
|Code||Observer / observatory|
|J51||Atlante Obs. in the Canary Islands, 2 in MPEC 2010-H63 -- 2010 GU21, 85839|
|A74||Bergen-Enkheim Obs. in Germany, 1 in MPEC 2010-H63 -- 2000 HD74|
|448||Desert Moon Obs. in New Mexico, 5 in MPEC 2010-H63 -- 2010 GT7, 2010 GR75, 2010 GO33, 2010 EV45, 2005 GB120|
|J95||Great Shefford Obs. in England, 1 in MPEC 2010-H63 -- 2010 GE35|
|H01||Magdalena Ridge Obs. (MRO) in New Mexico, 3 in MPECs 2010-H63, 2010-H64 & 2010-H65 -- 2010 HW20, 2010 HV20, 2010 FH81|
|118||Modra Obs. in Slovakia, 1 in MPEC 2010-H64 -- 2010 HV20|
|G96||Mt. Lemmon Survey (MLS) in Arizona, 3 in MPECs 2010-H63, 2010-H64 & 2010-H65 -- 2010 HW20, 2010 HV20, 2010 HG20|
|H11||Rodeo Obs. in New Mexico, 3 in MPECs 2010-H63 & 2010-H64 -- 2010 HV20, 2010 GT7, 2010 GR75|
|691||Spacewatch 0.9m telescope in Arizona, 4 in MPEC 2010-H63 -- 2010 GW62, 2010 GR75, 2010 FA81, 218017|
|291||Spacewatch 1.8m telescope in Arizona, 1 in MPEC 2010-H63 -- 2010 HG20|
|926||Tenagra II Obs. in Arizona, 6 in MPECs 2010-H63 & 2010-H64 -- 2010 HV20, 2010 HG20, 2010 HF, 2010 GW62, 2010 GR75, 2009 JO2|
|G56||Walnut Creek Obs. in northern California, 1 in MPEC 2010-H63 -- 2010 GS7|
|For a list of all participating observatories that have Web addresses, see A/CC's Observatory Links page.|
Impact Risk Monitoring on 26 April '10
Notes for Today's Latest Risk Assessments
|2010 HV20||JPL Sentry||1830||2092-2106||3||1.7e-08||-6.14||-6.26||0||JPL: "Analysis based on 42 observations spanning 1.1078 days (2010-Apr-25.36474 to 2010-Apr-26.47256)." Diameter approximately 0.140 km. from mean, weighted H=21.9.|
|2010 HS20||NEODyS||1340||2017-2089||82||3.85e-06||-4.54||-5.03||0||NEODyS: "Based on 26 optical observations (of which 0 are rejected as outliers) from 2010/04/20.420 to 2010/04/25.488."|
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 '10
Times are UTC for when items were noted or added by The Tracking News.
|1830||Noted that JPL Sentry has posted 2010 HV20 as an impact risk - see above|
|1632||Grabbed MPEC 2010-H64 - 2010 HV20 - see above|
Grabbed MPEC 2010-H65 - 2010 HW20 - see above
|1340||Noted that NEODyS has posted 2010 HS20 as an impact risk - see above|
Grabbed MPEC 2010-H63 - Daily Orbit Update - see above