Saturday24 April 200410:55pm MDT2004-04-25 UTC 0455 back top next  

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


Today's issue status: done & updated
yesterdayApriltomorrowIndex

Cover: Comet C/2004 F4 (Bradfield) from Juan Lacruz, who writes, "I composed this average of three 5-sec frames at 1.25 arc sec/pxl resolution taken from La Canada this morning." See the whole image at 50% and more info below, and on his Web site you can see the full-res 195Kb image as normal, reversed, and with Larson-Sekanina analysis.

News briefs – panel 1/2 Major News for 24 April 2004 back top next  
News briefs

FMOP news:  MPEC 2004-H60 today announces 2004 HC33, which is the object temporarily designated SW40DK reported yesterday as having been discovered by Spacewatch FMO Project online volunteer Robert Gagliano of Arizona while reviewing images from the Spacewatch 0.9m telescope in Arizona. It was quickly confirmed with the Spacewatch 1.8m telescope, and was further confirmed last night by Great Shefford Observatory in England and this morning by Grasslands Observatory in Arizona. At absolute magnitude (brighness) H=25.8, this object is estimated at roughly 20 meters/yards wide. The JPL Close Approaches page shows that it will pass Earth at about 7.2 lunar distances tomorrow.

Today's Daily Orbit Update MPEC includes positions for NEO 2004 HA1 from the 0.9m telescope that online volunteer Andrew Walker of Sydney, Australia reported as an FMO discovery candidate yesterday morning.

more news briefs >>

C/2004 F4 (Bradfield) from 
La Canada Obs. 24 April 2004

The C/2004 F4 (Bradfield) image Juan Lacruz sent from La Canada Observatory from this morning, shown whole at 50% size. The cover above shows it cropped at 100%.

Comet Bradfield:  MPEC 2004-H64 today updates comet C/2004 F4 (Bradfield) using the first MPEC-reported ground-based CCD observations for this object, from Ageo Observatory beginning at 1904 UT yesterday in Japan and this morning from Montcabre Observatory in Spain.

News briefs - panel 2/2 Major News for 24 April 2004 back top next  

<< continued from panel 1

Comet news:  MPEC 2004-H66 today announces comet P/2004 H3 (Larsen), the second in a row with that name (see April 21st). Like the other, it comes to perihelion out past the orbit of Mars (on February 29th this year, according to the first preliminary calculation). Jeff Larsen spotted it Thursday morning with the Spacewatch 0.9m telescope in Arizona, and it was confirmed by six other observing facilities through this morning.

Extrasolar minor objects:  An Astrobiology Magazine article today, "Nearby Planet Nursery," tells about correlating what's being observed around AU Microscopii (AU Mic), a "dim red dwarf star . . . a mere 33 light years away," with dust and minor objects in our own Solar System. A page about AU Mic and its siblings reports that they are believed to be part of a group including beta Pictoris, which not only has a planetary disk but is also believed to be feeding dust into our own Solar System (see Index).

Precovery:  MPEC 2004-H67 today reports that Andrew Lowe has located 2004 FN18 in images from the Mt. Palomar 1.2m Schmidt telescope from 5 October 1954 as well as 1 and 7 June 2002. The earliest position for this object until now had been its discovery observation on March 27th. And this object, which is now estimated at just under a kilometer in diameter, was listed by NEODyS with impact solutions from March 30th to April 2nd.

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Risk monitoring 24 April

The Saturday Daily Orbit Update MPEC (DOU) has observation of 2004 HW from yesterday morning from the Spacewatch 1.8m telescope in Arizona, the first to report it besides the Siding Spring Survey (SSS) 0.5m telescope in Australia, which discovered, confirmed, and has been following this object since the 18th. And this DOU includes a restatement of all 26 SSS-reported positions. JPL has now removed its last impact solution, while NEODyS today raised its still low-rated overall risk assessment for 2004 HW.

The DOU has two positions reported for 2004 HZ from Great Shefford Observatory in England last night. Today both risk monitors cut their impact solution counts (from 116 to 53 at NEODyS) for this small object while slightly raising their overall risk ratings.

Two positions were reported for 2004 HE12 from the Spacewatch 1.8m telescope from yesterday morning, and today both risk monitors cut solution counts (from 139 to 28 at JPL) and lowered risk assessments for this object.

Summary Risk Table - sources checked at 0434 UTC, 25 Apr

Object

Assessment

Years

VI
PS
cum
PS
max
T
S
Arc 
days
 2004 HZ NEODyS 4/242020-207753-2.88-3.1004.797
JPL 4/242023-208744-2.79-3.0004.797
 2004 HW NEODyS 4/242023-20803-5.31-5.3504.734
JPL 4/24R E M O V E D
 2004 HQ1 NEODyS 4/242077-20806-6.14-6.3804.828
JPL 4/242071-210111-5.18-5.3204.828
 2004 HMJPL 4/242104-21041-5.29-5.2907.691
 2004 HK33JPL 4/252010-210345-2.38-3.0603.012
 2004 HF12JPL 4/232104-21041-5.33-5.3302.756
 2004 HE12 NEODyS 4/242013-207923-3.76-4.0602.999
JPL 4/242015-209628-3.98-4.3202.999
 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.

Begues Observatory in Spain observed 2004 HM early today, and JPL has now narrowed its risk assessment down to one low-rated solution, for the 15th of April 100 years from now.

more risk monitoring >>

Risk monitoring - panel 2/2 Major News for 24 April 2004 back top next  

<< continued from panel 1

2004 HQ1 is reported from Great Shefford last night, and today JPL very slightly raised its low ratings for this object, while NEODyS slightly lowered its risk assessment.

And Great Shefford reported 2004 GE2 from early today. JPL has again slightly lowered its risk assessment for this object, which was shown on yesterday's A/CC news "cover" and is passing the Earth at 12.9 lunar distances today.

2004 HF12 is the only object missing from today's DOU that has impact solutions and is currently in view.

Late update:  JPL has posted 2004 HK33, announced in MPEC 2004-H69 with a time stamp of 2309 on the 24th UT as discovered on the morning of the 21st by LINEAR, which also confirmed it on the 22nd and the 24th, as did CINEOS in Italy early on the 23rd. JPL puts this object's diameter at 1.6 km. (0.99 mile)

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