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News Release Archive:

News Release 494 of 948

March 12, 2003 02:00 PM (EST)

News Release Number: STScI-2003-08

Too Close for Comfort: Hubble Discovers an Evaporating Planet

Technical facts about this news release:

About the Object
Object Name: HD 209458
Object Description: Host Star to Transiting Planet HD 209458b
Position (J2000): R.A. 22h 03m 10.8s
Dec. +18° 53' 04.0''
Constellation: Pegasus
Distance From Earth: 46 parsecs (150 light-years)

Object Name: HD 209458b
Object Description: Extrasolar Planet Transiting HD 209458
Jupiter-like Planet with Detected Atmosphere
Orbital Period: 3.5 days
Distance Above Star's Surface: 4 million miles (6.4 million kilometers)
Estimated Mass: 0.7 times Jupiter's mass
220 times the Earth's mass
Maximum Temperature: 2000 degrees Fahrenheit (1100 degrees Celsius)
About the Data
Data Description: These data are from the HST archived proposal 9064. The science team is composed A. Vidal-Madjar, A. Lecavelier des Etangs and J.-M. Désert (Institut d'Astrophysique de Paris, CNRS, France), G. Ballester (University of Arizona), R. Ferlet and G. Hébrard (Institut d'Astrophysique de Paris, France), and M. Mayor (Geneve Observatory, Switzerland).
Instrument: STIS
Exposure Date(s): August 11, 2001; September 7/14/15, 2001; October 30, 2001
Exposure Time: 7 hours
Filters: G140M (1150-1700 Å), G430L (2900-5700 Å), E140M (1150-1700 Å)
About the Image
Release Credit: ESA, A. Vidal-Madjar (Institut d'Astrophysique de Paris, CNRS, France) and NASA
Release Date: March 12, 2003 2:00 pm (EST)/20:00 (CET)