Friday8 October 20049:41pm MDT2004-10-09 UTC 0341 last
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News briefs

SOHO news:  The government-published Taiwan Journal has a long article today, “Stargazing hobbyist discovers new comet,” about the September 22nd discovery of C/SOHO-838 by Tsai Yuan-sheng, “Taiwan's first discoverer of a comet using the SOHO images.”

Crater news:  American Scientist posted an article today about the nature of the scientific debate over whether circular depressions in the Sirente plain of Italy were caused by impacts in the late Roman era. See also articles in Tumbling Stone #18 and #25 [temporary link].

WISE news:  NASA has decided to proceed to the preliminary design phase for the Wide-field Infrared Survey Explorer (WISE) mission, which would launch in 2008. See a University of California at Los Angeles news release from yesterday. The mission's science page states that, among other tasks, it “will be able to measure the diameters of more than 100,000 asteroids” and will study comet tails and the dust/debris disks of the Sun and other stars.

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Today's issue status: done, updated

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FMOP news:  Current NEOCP object SW40HK [now designated 2004 TJ10] was discovered today by FMO Project online volunteer Robert Klein.

Extrasolar news:  An Astronomy magazine article yesterday tells that a silicate dust belt has been newly discovered 6.4 AU from beta Pictoris in addition to belts already known at 16 and 30 AU. Commentator Steve Desch is quoted: “All the grains we see in Beta Pic were liberated from larger bodies — comets or planetesimals — in the last few thousand years. This is a system that's still in the process of creating terrestrial planets.” (Some of that dust flows into our own Solar System — see news links.)

Risk monitoring - panel 1/1 Major News for 8 Oct. 2004 previous
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Risk monitoring yesterday 8 Oct. tomorrow

The Friday Daily Orbit Update MPEC (DOU) has observation of 2004 TN from the Spacewatch 1.8m telescope in Arizona yesterday morning, and today NEODyS slightly lowered its risk assessment for this object while cutting its impact solution count from 48 to six.

The DOU also reports observation of 2004 RQ252 yesterday by the Siding Spring Survey in Australia. Today NEODyS very slightly lowered its overall risk assessment for this small object while increasing its solution count from one to three.


Late update:  JPL posted 2004 TN today, on October 8th UTC.

Thanks to Stu Megan for assistance with this risk monitoring report.

Summary Risk Table - sources checked at 0331 UTC, 9 Oct

Object

Assessment

Years

VI
PS
cum
PS
max
T
S
Arc 
days
 2004 TN1 NEODyS 10/72013-206412-3.65-3.7001.764
JPL 10/72013-209318-3.50-3.5501.764
 2004 TNJPL 10/82023-20736-6.37-6.8903.008
 NEODyS 10/82023-20706-5.38-5.8903.008
 2004 RQ252 NEODyS 10/82017-20553-6.42-6.52021.791
JPL 10/3R 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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