TrES-4

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Exoplanet
TrES-4

Size comparison between Jupiter (left) and TrES-4 (computer graphics)

Size comparison between Jupiter (left) and TrES-4 (computer graphics)
Constellation Hercules
Position
equinox : J2000.0
Right ascension 17h 53m 13s
declination + 37 ° 12 ′ 42 ″
Orbit data
Central star GSC 02620-00648
Major semi-axis (0.0509 ± 0.0007) AE
Period of circulation 3.5539 days
Further data
diameter approx. 244,000 km
Dimensions (0.92 ± 0.07) M J
distance 1400 ly
(440 ± 60) pc
history
discovery TrES , Mandushev et al.
Date of discovery 2007
Catalog names
TrES-4
More information
 Hot Jupiter

TrES-4 , also called TrES-4 b , is an exoplanet in the constellation Hercules and about 440 parsecs (approx. 1,400  ly ) from Earth . It consists mainly of hydrogen and has an extremely low density . TrES-4 orbits the star GSC 02620-00648 with an orbital period of 3.55 days .

Physical Properties

TrES-4 has 1.704 times the diameter of Jupiter (this corresponds to approx. 244,000 km), but has only about 92 percent of its mass (1.75 · 10 27 kg). Its average density is around 0.33 grams per cubic centimeter and well below that of Jupiter. Due to its close proximity to the central star - the distance is around 7.5 million kilometers (0.05 AU ) - the planet has a surface temperature of around 1,600 Kelvin .

Theoretical problem

TrES-4 poses a theoretical problem. According to the Lowell Observatory, the planet is much too big for a gas planet , measured by its mass and temperature. The cause of this fact has not yet been clarified.

See also

Individual evidence

  1. ↑ a b c d e http://exoplanet.eu/star.php?st=TrES-4

Web links