Another morning meteor shower - Saturday morning 9/1/07

Here is another reason to wake up early on Saturday morning - a rare meteor shower! Bright shooting stars should be visible even with a big old bright moon, and our city light pollution. Look to the East and Northeast. "Some time in the 40 years or so around 4 A.D., comet Kiess (C/1911 N1) passed by the Sun, ejecting a cloud of dust particles. The comet returned in 1911, after completing one orbit. The dust particles were pushed by the Sun's light into slightly wider orbits and have been returning ever since, forming a thin ongoing stream of dust that usually passes just outside Earth's orbit. On occasion, the combined gravity of the solar system's planets moves this dust trail into Earth's path. Earth encountered this 2000-year-old dust in 1935, 1986, and 1994, causing a meteor shower known as the Aurigids." http://aurigids.seti.org/ Best viewing direction: Best viewing: Keep Moon out of field of view (best to block behind obstruction such as telephone pole, then watch whole sky), avoid city haze that scatters moonlight Best direction: East and Northeast Best time: Start one hour before peak, then see the rate of meteors increase and decrease while Earth travels through the shower When: Date: 2007 September 1 Peak time: about 11:33 +/- 20 minutes UT (= 04:33 a.m. Pacific Daylight Savings Time). Duration: about 1.5-hour Width: 25 minutes above half the peak rate What: Peak rate: ZHR (Zenithal Hourly Rate) = 200 per hour (10-minute interval) Meteor brightness: mostly -3 to +3 magnitude Shower radiant: constellation Auriga (Radiant at RA = 92, Decl. = +39) Entry speed: Vinf = 67 km/s Where: Visible from: California, Oregon, Hawaii, Alaska, Mexico [see flux applet for visibility from your location] Moon: 4 days past Full Moon, high in the sky Important because: Once in a lifetime crossing of the dust trail of a known long period comet (comet Kiess). Public interest: When you make a wish, consider that each meteoroid was released at some unknown moment during the period 36 B.C. - A.D. 45. Links: NASA Ames News Release: http://www.nasa.gov/centers/ames/news/releases/2007/07_59AR.html -- Jane Houston Jones Senior Outreach Specialist, Cassini Program JPL - 4800 Oak Grove Drive, MS 230-205 Pasadena, CA 91109 818-393-6435 jane.h.jones(a)jpl.nasa.gov Cassini SOC http://soc.jpl.nasa.gov/index.cfm What's Up? http://education.jpl.nasa.gov/amateurastronomy/index.html