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November 27, 2001 01:00 PM (EST)

News Release Number: STScI-2001-38

Hubble Makes First Direct Measurements of Atmosphere on World Around another Star

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Technical facts about this news release:

About this 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: 2,000 degrees Fahrenheit (1100 degrees Celsius)
About the Data 
Instrument: STIS
Spectral Wavelengths: G750M (581.3 to 638.2 nm)
Exposure Dates: Apr 25 2000; Apr 28 2000; May 5 2000; May 12 2000
Exposure Time: 7 hours
Principal Astronomers:

D. Charbonneau (CalTech and Harvard-Smithsonian CfA), T. Brown (High Altitude Observatory /NCAR), R. Noyes (Harvard-Smithsonian CfA), and R. Gilliland (Space Telescope Science Institute)
About this Release 
Release Date: November 27, 2001
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