Saturday15 May 20046:28pm MDT2004-05-16 UTC 0028 back top next  

The Asteroid/Comet Connection's
daily news journal about
asteroids, comets, and meteors

Today's issue status: done

Cover: Small object 2004 JO12 as caught by Peter Birtwhistle at Great Shefford Observatory in England last night while it was posted for confirmation with temporary designation SW40DV after discovery by FMO Project online volunteer Lisa Turner of Texas. She found it yesterday morning while reviewing images from the Spacewatch 0.9m telescope in Arizona. See more info below.

Details: SW40DV 2004 May 14 2203-2210 UT. Mag +18.4. 21x8 sec exposures (total exposure 2m48s). Binned 2x2 and enlarged x2. Motion 25"/min in p.a. 16°. Field 10'x10', N up. 0.30m f/6.3 Schmidt-Cassegrain + CCD. J95
News briefs – panel 1/2 Major News for 15 May 2004 back top next  
News briefs

FMOP news:  In the last couple days, the FMO Project has had three objects from the Spacewatch 0.9m telescope in Arizona placed on the Minor Planet Center NEO Confirmation Page (NEOCP), and two have now been announced in discovery MPECs. The first MPEC, as noted in late reporting yesterday, was for 2004 JO12 (see "cover" above). Found that morning by online volunteer Lisa Turner of Texas, it had been described by Spacewatch as having "poor" confirmation prospects but was picked up by three European observatories during a four-hour period overnight.

At 0538 UT this morning, three hours after the first, the second MPEC announced 2004 JP12, which had been found by online volunteer Franco Mallia of Italy and temporarily designated SW40DT (see a brief report). Its confirmation prospects had been called "good," and it was caught by the Spacewatch 1.8m telescope yesterday morning and early today, and by Great Shefford Observatory in England last night.

The MPECs put absolute magnitude (brightness) at H=23.8 for both objects, which converts to roughly 60 meters/yards wide. According to the FMOP tally, these are the fourth and fifth volunteer discoveries to receive MPC designations (the first was in January).

The news page maintained for FMOP participants reports that one other object was put on the NEOCP yesterday, found by volunteer Richard Broad moving at "30 deg/day," probably too fast to be confirmed.

more news >>

Big NEO:  MPEC 2004-J75 today announces 2004 JN13 as discovered this morning by LINEAR in New Mexico and matched with observations from the Catalina Sky Survey (CSS) April 23rd and LONEOS May 13th, both in Arizona, and also from LINEAR yesterday. The MPEC has H=14.7, which converts by standard formula to a rough width estimate of 3.89 km. (2.42 miles)

News briefs – panel 2/2 Major News for 15 May 2004 back top next  

<< continued from panel 1

Hayabusa flyby:  The Japan Aerospace Exploration Agency (JAXA) Institute of Space and Astronautical Science (ISAS) home page has this item dated May 13th about its MUSES-C "Hayabusa" asteroid mission:

Around 11:00 (AM, JST) of May 12, Deep Space Control Center of ISAS, JAXA, successfully made fine adjustment to asteroid explorer "Hayabusa" which had been launched May 9, 2003. The adjustment was the preparatory operation toward the Earth swingby scheduled for May 19. At the instant of the propulsive operation at 11:00 of May 12, the distance between Hayabusa and Earth was 2.5 million km, and the velocity of Hayabusa was about 4 km/s. [Delta] V was 13.2 cm/s. The final results of the swingby including the closest approach to Hayabusa will be confirmed in the morning of May 20. The success would be the world-first swingby for spacecraft using an ion engine as a main thruster. 

ISAS also has a feature article dated May 11th, "High Hopes for the Age of Epic Space Voyages," by Hitoshi Kuninaka about Hayabusa and ion propulsion.

Comet news:  Update MPEC 2004-J71 today for the first time shows a closed orbit for C/2004 F4 (Bradfield), with eccentricity at e=0.999320 as compared with e=1.0 before this. Coincidentally, IAUC 8320 of April 12th with C/2004 F4's discovery details has now been made public.

The Unione Astrofili Italiani Comet Section has a page with many images of C/2001 Q4 (NEAT), including some that closely examine the coma dust shells and tail details through image processing.

Risk monitoring - panel 1/1 Major News for 15 May 2004 back top next  
Risk monitoring 15 May

The Saturday Daily Orbit Update MPEC (DOU) has observations of 2004 JO2 from Junk Bond Observatory in Arizona yesterday morning and last night from KLENOT in the Czech Republic, Great Shefford Observatory in England, and Consell Observatory in Spain. That work extended what had been a 1.055-day observing arc with 17 positions by 1.682 days with another 12 observations. And today JPL removed its single impact solution for this kilometer-size object, and NEODyS removed its three solutions, including one 173 days away.

The DOU also has observation of 2004 JQ1 from the Spacewatch 1.8m telescope in Arizona yesterday morning and early today from Consell Observatory. These eight observations added 2.662 days to what had been a 1.079-day observing arc with 20 positions, and that was all it took for JPL to remove all of its 29 impact solutions and for NEODyS to remove its 213.

Summary Risk Table - sources checked at 2359 UTC, 15 May




 2004 JQ1JPL 5/15R E M O V E D
NEODyS 5/15R E M O V E D
 2004 JO2JPL 5/15R E M O V E D
NEODyS 5/15R E M O V E D
 2004 HZNEODyS 5/14R E M O V E D
JPL 5/142023-20231-4.69-4.69018.114
 2004 HQ1 NEODyS 5/112079-20791-6.85-6.85019.218
JPL 5/3R E M O V E D
 2004 HMJPL 5/142104-21041-7.25-7.25026.957
 2004 GE2JPL 4/242100-21001-6.02-6.02011.811
VI = count of "virtual impactors" (impact solutions)
See A/CC's Consolidated Risk Tables for more and maybe
  newer details, and check the monitors' links for latest info.
Note that only objects recently in view are shown here.

Note: The above Summary Risk Table and A/CC's Consolidated Risk Tables (CRT) page are used to follow the cycle of observation and analysis for objects under current observation that have impact solutions, so 2004 GE2, which hasn't been reported since April 24th, will be pulled from these listings tomorrow.   [ top ]
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