April 2003 Asteroid/Comet News
Updated: 13 July 2004
<<March 2003 News ^UP^ May 2003 News>>
Space.com had an April 1st article exploring "What is a Moon? Definition Lags Behind Soaring Satellite Tally." It reports some possible new terms such as "minor," "irregular," and "ring" moons to help better describe the range of objects being discovered. Minor objects, too, can have natural satellites, or can be binary pairs that orbit about a point in space between themselves, and some irregular planetary moons may be captured minor objects.
2 April 2003
The 3 April edition of the journal Nature has two articles for purchase about asteroid formation: "Structure and thermal history of the H-chondrite parent asteroid revealed by thermochronometry," by Mario Trieloff et al., and "Planetary science: Of asteroids and onions," by John A. Wood. Space.com had a 2 April summary article, "New Study: Some Asteroids are Like Onions." And, speaking of asteroids with differentiated layers, Science@NASA on 2 April has a picture of 4 Vesta taken from aboard the International Space Station. This month Vesta is in good view for ground-based observers of all experience levels, as Sky & Telescope explained, along with a lot of interesting information.
3 April 2003
A new Centaur, 2003 CC22, was announced in MPEC 2003-G16 on 3 April. It was discovered by Scott S. Sheppard et al. on 8 Feb. on Mauna Kea in Hawaii, and also found in Kitt Peak images of 2 and 4 Feb. Its lowly-inclined orbit is calculated to run between 4.20 and 10.79 AU, just barely crossing the orbits of Jupiter (q = 4.95 AU) and Saturn (Q = 10.05 AU).
David Morrison on 3 April posted the text and links of the final report from the Workshop on Near Earth Objects: Risks, Policies and Actions held 20-22 Jan. 2003 in Frascati, Italy by the European Organisation for Economic Co-operation and Development (OECD) Global Science Forum. There's more about this also at Tumbling Stone.
5 April 2003
MPEC 2003-G25 on April 5th announced 2003 GS, rated by the Minor Planet Center as a PHO. This is another object that travels mostly inside Earth's orbit, with initial calculations showing aphelion at 1.088 AU. It was discovered the morning before by Michael Van Ness at LONEOS. The MPEC showed 83 follow-up observations from overnight from 16 professional and amateur observatories in Europe and the U.S.
7 April 2003
Cambridge Conference Correspondence for 4 April, posted on the 7th, has the text of a 3 April news item which may be the first public notice in English of a new Main Belt asteroid mission proposal, the Bering Probe, which comes from scientists belonging to several Danish institutes. In January 2003, at the New Trends in Astrodynamics and Applications conference at the University of Maryland, a paper on "The 'Bering' Small Vehicle Asteroid Mission Concept" was scheduled from Rene Michelsen, Anja Andersen, et al. The Technical University of Denmark Measurement & Instrumentation Systems department has an undated Bering introduction page, which says that the "entirely Danish project," to be "launched around 2006 at an estimated cost of $170 millions," is designed to carry a telescope, laser ranging device, magnetometers, and star trackers. With a 40-minute radio delay, the spacecraft will need to operate autonomously.
8 April 2003
Cambridge Conference Correspondence for 8 April (and a SpaceRef.com 7 April posting) carried the text of an April 4th letter to NASA from U.S. NEO scientists urging NASA to add a new, exciting, and affordable goal for human spaceflight and the use of the space station. This is the inclusion of "mitigation" or "NEO deflection studies" (i.e., how to prepare for a comet or asteroid that is found on an Earth-threatening path), as one of NASA's primary goals. . . [We] propose a new goal for human and robotic space flight: Show how humans and robots can work together on small objects in near-Earth interplanetary space. Space.com had an article about this on the 9th.
9 April 2003
It was announced April 9th that "This week NASA gave The Johns Hopkins University Applied Physics Laboratory [JHU/APL], Southwest Research Institute [SwRI] and their partners the go-ahead to start full development of the first mission to Pluto and the Kuiper Belt . . . to go forward with spacecraft and ground system construction," as explained in separate news releases from APL and SwRI. UPI ran a 9 April story quoting APL's Thomas Coughlin: "We're ready to start cutting metal." And Astronomy.com had a 12 April article. For more info about the mission, which is scheduled for launch in 2006, see A/CC's New Horizons and Pluto/Charon archives.
10 April 2003
A BBC 10 April article, "Voyage to the asteroid belt," tells about a new Main Belt mission proposal named Apies (Asteroid Population Investigation and Exploration Swarm), for which ESA "has given the go-ahead for a feasibility study" led by Astrium. It would reportedly involve "30 or more" micro-spacecraft powered by conventional rockets or solar sails.
12 April 2003
UPI had a 12 April article about "Space stations built by radio," telling about Narayanan Komerath's concept of using radio waves as force fields to someday build "sanctuaries against the deadly radiation storms of interplanetary space assembled from tens of thousands of tons of extraterrestrial rubble." See also A/CC's earlier report, "Reconstituting pulverized asteroids."
14 April 2003
Ball Aerospace in a news release dated 14 April announced that NASA has selected it to be a member of the team assembling the proposal for the Widefield Infrared Survey Explorer (WISE), with responsibility for building and operating the spacecraft. If the proposal is accepted next year, the mission could launch in 2008. Among other goals are asteroid observations, to "provide a vast database of new astrometric and radiometric information on [known and] previously unknown [Main Belt] asteroids . . . larger than 3 km." And, "WISE will always be scanning 90° away from the Sun and thus will be quite good at detecting near Earth objects." 200m objects will be "easily detectable" at 1 AU from Earth.
20 April 2003
This was posted to the JPL home page between 16 and 20 April:
Changing of the GuardNothing is said about continuity of the NEAT program, and "Quest," as an acronym for "Quasar Equatorial Survey Team," doesn't sound like anything to do with minor objects. However, this change-out had been long anticipated by NEAT. A NASA NEO awarded proposals page, for example, has a statement from NEAT that its "discovery efficiency is expected at least to double, and perhaps quadruple" with the Quest camera.
The Yale Quest program has a camera page, and the page for its Palomar project says that observations will begin "later" this year. NEAT has a page showing its old camera.
Updates: Some observations from the telescope appeared in the MPECs from June 16th, and more were reported beginning July 8th, including discovery credit for NEO 2003 NL7 in MPEC 2003-N41 of July 11th. JPL put out a 15 July news release about this discovery and progress in commissioning the new 161-megapixel camera, and Astronomy.com had a July 27th article.
Indiana University issued a July 29th news release, "World's largest astronomical CCD camera installed on Palomar Observatory telescope."
22 April 2003
An April 22nd at the University of Maryland Diamondback student newspaper talks about cost, scheduling, and technical difficulties with the coming Deep Impact comet mission, planned to launch in late December next year or early January.
23 April 2003
A University of Arizona news release reports that 23 April 2003 was the 80th anniversary of the formal dedication of the Steward Observatory's 0.9-meter telescope, an event attended by the then Vice President of the United States, Calvin Coolidge. The telescope was moved in 1962 to Kitt Peak from its original location in Tucson, Arizona, and in 1982 it was turned over to Spacewatch, which used it to discover many NEOs while pioneering the computer-aided CCD sky scanning process used by today's large NEO programs. Spacewatch built a larger telescope, the 1.8m, which began service in 2001. Then, a year ago today, the 0.9m was taken out of action for overhaul, getting a new CCD mosaic and primary mirror. Its return to duty was marked by the announcements of its first NEO discovery on March 10th, and of its first PHO discovery on May 9th, 2003 JC13.
24 April 2003
The Sloan Digital Sky Survey (SDSS) Moving Object Catalog was updated on April 24th in its second release, which lists "astrometric and photometric data for 134,335 moving objects observed prior to March 11, 2003. The catalog also includes orbital elements for 26,847 previously known objects. . . Objects from the first release are included in the second release because the photometric pipeline and flatfield vectors changed a bit between the two releases."
26 April 2003
Sky & Telescope has an article about the upcoming occultation of a star in the constellation Cancer by Main Belt asteroid 74 Galatea. Observing such events is an important worldwide activity, carried out mostly by amateurs, that can lead to information about an asteroid's size and shape, and even whether it may be a binary object. An observer in the path of a predicted star shadow uses a telescope and camcorder to carefully time the duration of the stellar eclipse. Predictions of time and path are posted at various sites, such as one for Galatea for 16 May, which is a link from the Western Hemisphere page of the International Occultation Timing Association (IOTA).
27 April 2003
The coming week's issue of Newsweek had an article posted 27 April on MSNBC about the mostly quiet efforts of several dot.com entrepreneurs to invest their fortunes in new space businesses. While the focus is on human flight and space tourism, increased public interest and lower-cost access to space, when it comes, will also help boost low-budget missions to minor objects. Space.com on 16 April told about SpaceX, noted in the Newsweek piece as maybe the most promising effort. See also articles about SpaceX 22 April on Wired News and 15 April at USA Today.
28 April 2003
The new Planetary Science Research Discoveries article, "Asteroidal Lava Flows," posted April 28th, tells how researchers believe they "may have pieces of lava flows from five different asteroids," including 4 Vesta and another body of similar size that hasn't been identified and may no longer exist.
29 April 2003
The Meteoritical Society posted a news item 29 April about allocating particle samples when returned from 81P/Wild 2 by the Stardust mission. A workshop on the nature of interplanetary and interstellar dust will be held in August (see A/CC's Calendar item) as the first of a series, with another next year about extracting particles from the aerogel collecting medium.
30 April 2003
Space.com had an article April 30th, "'Shocking' Experiment Reveals How Asteroids Explode," summarizing an article on "Interplanetary dust from the explosive dispersal of hydrated asteroids by impacts" in the May 1st edition of the journal Nature. Researchers Kazushige Tomeoka et al. conclude from physical testing of meteorite samples that "Hydrous material shatters over a much broader pressure range than anhydrous, suggesting that collisions between asteroids produce a preponderance of hydrated material in the interplanetary dust."
A University of Arizona news release April 30th announced that planetary scientist and cratering expert H. Jay Melosh has been elected to the U.S. National Academy of Sciences.
Today was the tenth anniversary of the European Organization for Nuclear Research (CERN) putting the World Wide Web into the public domain, as documented in a CERN news release of 29 April. In the decade since, the larger astronomical community has been at the forefront of putting this new communications medium to good use.
The week of 1-8 April was designated National Dark-Sky Week in the U.S., as announced 8 Jan. by the International Dark-Sky Association with facts and illustrations. Space.com had articles 21 March and 27 March about the issue of light pollution. UPI put a story on the wires 29 March. And Sky and Telescope had a 1 April article and an interview with activist Jennifer Barlow.
SIRTF stands down
With the Space Infrared Telescope Facility (SIRTF) launch planned for mid-April, there were news releases April 3rd from Ball Aerospace (with pictures) and the University of Minnesota about their participation in the mission.
UK/Ireland National Astronomy Meeting
CHFT: The National Research Council of Canada had a news release April 8th, "National Research Council's engineers help build the biggest astronomical camera in the world," and BBC had a report April 11th. They tell about upgrading the 3.6m Canada-France-Hawaii Telescope (CFHT) on Mauna Kea with a new camera that combines 40 CCDs (a "CCD mosaic") to take images made up of 324 million pixels. BBC: "It has an unusually large field of view of one square degree, the size of four full Moons," and has already been used to look at near-Earth objects. "It has also started the CFHT Legacy Survey which will comprise 500 nights over the next five years for studying the Kuiper Belt and the large scale structures of the Universe." The camera manufacturing facility in France has a MegaCam page with technical details, and see CFHT's MegaPrime page for more details.
Risk concerns removed during April 2003