Bunches of Geminids
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Bunches & Bunches of Geminids
December 16, 1998:
When the Geminid meteors first appeared in the mid-1800's they were
unimpressive. Those early showers boasted a
mere 10-20 shooting stars per hour, barely above the background
level of sporadic meteors.
Since then the Geminid meteors have grown in number until
today they make up one of the most spectacular annual showers. In 1996,
the last time the Geminids appeared in a dark moon-less sky,
observers saw as many as 110 per hour. According to preliminary
reports from more than 40 sky-watchers, this year's shower
was even better, peaking at 140 +/- 40 meteors per hour
hourly rate) during the morning of December 14.
Observers around the globe were treated to one of the strongest
Geminid showers ever. Next year could be even better.
Above, right: "Geminid meteors in Orion" -- Clicking on the image above will activate a video clip of two meteors streaking through the constellation Orion. They were filmed by Dr. Tony Phillips in Aspendell, CA at approximately 1110 UT on December 13, 1998, the night before the maximum of the 1998 Geminid meteor shower. He used an Astrovid 2000 CCD video camera with a 12 mm f1.2 lens, and a shutter speed of 1/60 sec. The 30 frame sequence spans 2 seconds of actual time. The dimmer of the two shooting stars, which travels straight down from the top of the image, is a Geminid. The brighter, which zooms in from the left, comes from the general direction of the constellation Leo. It is probably a sporadic meteor or a Coma Berenicid, but it could also be a late-arriving Leonid.
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This account from long-time meteor observer Mark Balzer in Oklahoma is typical of the reports received so far:
"This shower is one of the best I've seen in my 25 years of observing meteors, but not as good as the Leonids less than a month ago. Some of the meteors are fairly bright, up to magnitude -1 (not as bright as many Leonid meteors), but none are leaving lasting trails.... The meteors sometimes appear in groups of two or three. These groups may consist of meteors in the same part of the sky or observed simultaneously (or nearly so) in different parts of the sky."
1999: A good year for Geminids?The source of the Geminid meteoroids is a curious object called 3200 Phaethon that looks like an asteroid, but may be an extinct comet. It travels in a highly elliptical 1.4 year orbit that brings it within 0.15 AU (astronomical units) of the Sun. Phaethon will pass through the inner solar system next year, coming within 1.2 AU of Earth on October 16th. If 3200 Phaethon is indeed the source of the Geminid meteoroids, then its close approach to Earth next year bodes well for another impressive Geminid shower in 1999.
Take a virtual tour of the solar system, complete with the curious asteroid 3200 Phaethon, the source of the Geminid meteors.
Meteors for kids - from the NASA Liftoff Space Academy
NASA Liftoff meteor shower pages - learn the basics about meteor showers. Includes tutorials, Java animations, and educational activities.
Eyewitness accounts of the historic 1966 Leonid storm -- an Ames Research Center Archive
Satellite Tracking - monitor satellites as they weather the storm
NASA's Office of Space Science - press releases and other news related to NASA and astrophysics
The Geminids -- from Gary Kronk Meteors and Comets web site
December's generous Geminids -- Sky &Telescope article
Related Stories:27 Nov. 1998: A bust or a blast? -- New images of 1998 Leonid fireballs and their smokey remnants.
23 Nov. 1998: Leonids Sample Return payload recovered! -- Scientists are scanning the "comet catcher" for signs of Leonid meteoroids.
19 Nov. 1998: Early birds catch the Leonids -- The peak of the Leonid meteor shower happened more than 14 hours earlier than experts had predicted.
18 Nov. 1998:
A high-altitude look at the Leonids -- NASA science balloon catches video of 8 fireballs.
16 Nov. 1998: The Leonid Sample Return Mission -- NASA scientists hope to capture a Leonid meteoroid and return it to Earth.
16 Nov. 1998: NASA Spacecraft take cover from the Leonids -- but the Hubble Space Telescope won't stop observing.
10 Nov. 1998: Great Expectations: the 1998 Leonid meteor shower -- the basics of what the Leonids are and what might happen on November 17.
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