Friday30 April 20044:29pm MDT2004-04-30 UTC 2229 back top next  

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


Today's issue status: done
yesterdayApriltomorrowIndex

Cover: Comet C/2003 H1 (LINEAR) by Bill Yeung from April 9th. During the four-minute exposure, a satellite appeared in the frame, varying in brightness as it rotated. C/2003 H1 was at perihelion on February 22nd at 2.24 AU, out past Mars, in an extremely eccentric (e=0.9992), retrograde (138.7°) orbit. According to the JPL Orbit Viewer, it will be back in about 141,054 years after passing aphelion beyond 5,417 AU (just over a light month).

News briefs – panel 1/1 Major News for 30 April 2004 back top next  
News briefs

Bits & pieces:  MPEC 2004-H90 today shows that an asteroidal object that travels an orbit between Mars and Jupiter has been redesignated as comet P/2004 HC18 (LINEAR). It is calculated to be at its closest to the Sun on June 18th.

A/CC has published a number of "cover" images of minor objects with satellite streaks, such as today's above. The FMO Project tells that a bright fast-moving object reported by an online volunteer reviewing images from the Spacewatch 0.9m telescope on the 28th, and submitted to the Minor Planet Center, came back identified as a satellite.

Using that same telescope in Arizona, Jim Scotti found an object April 25th that is likely to be a comet. It was confirmed on 26 and 28 April, and this morning with the Spacewatch 1.8m telescope, without cometary activity being noted, and it was announced in MPEC 2004-H91 today with asteroidal designation 2004 HV60. But, the preliminary orbit calculation has it traveling nearly perpendicularly to the ecliptic

(i=93.2°) on a path between 3 and 348 AU from the Sun. Absolute magnitude is put at H=16.8, which, from a standard formula for roughly converting brightness to size, could be upwards of 3.3 km. (2 miles) in diameter if it has the dark surface typical of comet nuclei.

Risk monitoring - panel 1/1 Major News for 30 April 2004 back top next  
Risk monitoring 30 April

The coming full Moon interferes with the discovery and tracking of potentially hazardous objects, so it is no surprise that the Friday Daily Orbit Update MPEC (DOU) has new data for only one of the seven recently in view that have impact solutions. 2004 HQ1 is reported from David Tholen's team at the University of Hawaii 2.2m Telescope on Mauna Kea from early Wednesday, within the current observation arc. Today NEODyS and JPL both cut their 2004 HQ1 risk assessments down to just one very low rated impact solution in the year 2065.

Summary Risk Table - sources checked at 2159 UTC, 30 Apr

Object

Assessment

Years

VI
PS
cum
PS
max
T
S
Arc 
days
 2004 HZ NEODyS 4/262023-207617-2.61-2.6506.672
JPL 4/262023-206410-2.68-2.7206.672
 2004 HW NEODyS 4/292016-20453-4.82-5.1306.891
JPL 4/292092-20921-3.50-3.5006.891
 2004 HQ1 NEODyS 4/302065-20651-7.57-7.5709.741
JPL 4/302065-20651-7.73-7.7309.741
 2004 HMJPL 4/292101-21042-5.05-5.05010.990
 2004 HK33JPL 4/282019-21019-2.85-3.1805.997
 NEODyS 4/282019-207110-2.32-2.4805.997
 2004 GE2JPL 4/242100-21001-6.02-6.02011.811
 2004 GA1JPL 4/282083-20831-4.12-4.12015.708
NEODyS 4/19R E M O V E D
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.
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