Monday12 April 20042:22pm MDT2004-04-12 UTC 2022 back top next  

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


Today's issue status: done
yesterdayApriltomorrowIndex

Cover: Two images of comet C/2004 G1 (LINEAR) from the confirmation work of Robert Hutsebaut using a rented telescope at New Mexico Skies (large background image, a stack of four 20-sec. frames centered on 0555 UT on April 10th) and Juan Lacruz in Spain (inset, a stack of twelve 60-sec. frames centered on 2109 UT on the 10th). Juan Lacruz notes that "It was very windy, so I had to discard some shifted images, and I also had thin cirrus clouds, so the image contrast is not very high."

News briefs – panel 1/1 Major News for 12 April 2004 back top next  
News briefs

C/2004 F4 (Bradfield):  The IAU CBAT/MPC Astronomical Headlines page has at the top of its "Comets" section this information today: "C/2004 F4 (Bradfield). Visual discovery (his 18th — third most in history, after Pons and Brooks)." It is referring to the 18th discovery by famed Australian comet seeker William A. Bradfield. This is also the year's first amateur and first visual comet discovery. CBAT has made public the second of two circulars issued today about this comet, IAUC 8320, which provides an ephemeris but no other details. An image of C/2004 F4 made with a Canon camera and 100mm lens has been posted by Terry Lovejoy in Australia.

The German Comet Section reports that C/2004 F4 was discovered on March 23rd and was observed again the next day and on April 8th, then confirmed by others. The preliminary calculation has perihelion five days from now, viewable online via the SOHO LASCO C3 camera.

Readings:  The Sydney Morning Herald tomorrow (and, slightly different, The Age tomorrow) has an article telling of the third discovery by the Siding Spring Survey (SSS). This is 2004 GD, the only small object discovery announced last week from anywhere in the world (see A/CC report). It will fly past Earth at about 5.9 lunar distances on April 20th.

Space.com has an article today, "Catastrophe Calculator: Estimate Asteroid Impact Effects Online," that takes readers through some example scenarios with the University of Arizona's new Earth Impact Effects calculator page (see A/CC links). It reports that, "in coming weeks . . . background information explaining the complex calculations behind the program" will be posted.

Xinhua reports today, "Shanghai seeks to switch off 'light pollution,'" that "the city government plans to crack down on the emerging pollution problem by releasing regulations on illumination at night" and "Experts are appealing for national legislation and State standards against the so-called light pollution."

Risk monitoring - panel 1/1 Major News for 12 April 2004 back top next  
Risk monitoring 12 April

The Minor Planet Center Last Observation page is showing that 2004 FU4 was caught this morning with the 1.8m Vatican Advanced Technology Telescope (VATT) in Arizona, which may be the first that FU4 has been reported since the 1st of this month.

Summary Risk Table - sources checked at 2022 UTC, 12 Apr

Object

Assessment

Years

VI
PS
cum
PS
max
T
S
Arc 
days
 2004 FU4NEODyS 4/2R E M O V E D
JPL 4/22085-20851-3.07-3.07013.259
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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