HD 209458

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Stern
HD 209458 / V376 Pegasi
Pegasus HD209458 location.png
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Pegasus
Right ascension 22 h 03 m 10.77 s
declination + 18 ° 53 ′ 3.5 ″
Apparent brightness 7.65 likes
Typing
Known exoplanets 1
B − V color index +0.58 
Spectral class G0 V
Variable star type Coverage variable 
Astrometry
Radial velocity (−14.8 ± 0.2) km / s
parallax (20.67 ± 0.05)  mas
distance (157.7 ± 0.4)  ly
(48.4 ± 0.1)  pc
Visual absolute brightness M vis +4.2 mag
Proper movement 
Rec. Share: (+29.58 ± 0.08)  mas / a
Dec. portion: (−17.89 ± 0.08)  mas / a
Physical Properties
Dimensions (1.1 ± 0.1)  M ☉
radius (1.12 ± 0.02)  R ☉
Effective temperature (6090 ± 100)  K.
Metallicity [Fe / H] (+0.02 ± 0.05)
Age (4 ± 2) bill.  A
Other names
and catalog entries
Bonn survey BD + 18 ° 4917
Henry Draper Catalog HD 209458 [1]
Hipparcos catalog HIP 108859 [2]
SAO catalog SAO 107623 [3]
Tycho catalog TYC 1688-1821-1 [4]Template: Infobox star / maintenance / specification of the TYC catalog
2MASS catalog 2MASS J22031077 + 1853036 [5]
Other names V376 Pegasi
annotation
  1. ↑ estimated from apparent brightness and distance

HD 209458 , also known by its variable designation V376 Pegasi is a star with the apparent magnitude 8 may in the constellation Pegasus . The star is very similar to the sun , has the spectral class G0 V and is 160 light years away from the sun  . In 1999, two teams independently discovered the existence of a companion named HD 209458 b .

Data of the star

The mass of the star is about 110% of the solar mass, the radius is about 1.1 times larger than that of the sun. The surface temperature of 6000  Kelvin produces a luminosity 1.6 times brighter than that of the sun. The age of the star is estimated at 4 to 7 billion years, the rotation around its own axis takes 14.4 days.

Companion data

The planet with the designation HD 209458 b is in the focus of research because the first investigations found strong signs of water vapor . The mass of the planet is 69% that of Jupiter . With an orbit radius of 0.045  AU, it orbits its central star 8 times closer than Mercury . One cycle only takes three and a half days.

Web links

Commons : HD 209458  - Collection of images, videos and audio files

Individual evidence

  1. ↑ a b c d V376 Peg. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed on January 13, 2019 .
  2. ^ Hipparcos catalog (ESA 1997)
  3. ↑ a b Brown, Timothy M .; Charbonneau, David; et al. "Hubble Space Telescope Time-Series Photometry of the Transiting Planet of HD 209458" in "The Astrophysical Journal", Volume 552, Issue 2, pp. 699-709, bibcode : 2001ApJ ... 552..699B
  4. ↑ Pulkovo radial velocities for 35493 HIP stars
  5. ↑ Gonzalez, Guillermo et al. "Parent Stars of Extrasolar Planets." in "The Astronomical Journal", Volume 121, Issue 1, pp. 432-452, bibcode : 2001AJ .... 121..432G
  6. ↑ a b c HD 209458 b. In: Extrasolar Planets Encyclopaedia . Retrieved January 13, 2019 .