HD 69830

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Stern
HD 69830
artist's impression
artist's impression
AladinLite
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Aft deck of the ship
Right ascension 08 h 18 m 23.95 s
declination -12 ° 37 ′ 55.8 ″
Apparent brightness 5.95 likes
Typing
Known exoplanets 3
B − V color index +0.76 
U − B color index +0.33 
R − I index +0.38 
Spectral class K0 V
Astrometry
Radial velocity (30.29 ± 0.15) km / s
parallax (79.59 ± 0.06)  mas
distance (40.96 ± 0.03)  Lj
(12.564 ± 0.010)  pc
Visual absolute brightness M vis +5.47 mag
Proper movement 
Rec. Share: (278.79 ± 0.09)  mas / a
Dec. portion: (−988.29 ± 0.08)  mas / a
Physical Properties
Dimensions 0.86 ± 0.03  M ☉
radius 0.90 ± 0.01  R ☉
Luminosity

0.60 ± 0.03  L ☉

Effective temperature 5385 ± 20  K
Metallicity [Fe / H] −0.05 ± 0.02
Rotation time 21.5 days
Age 7 ± 3 billion  a
Other names
and catalog entries
Bonn survey BD -12 ° 2449
Bright Star Catalog HR 3259 [1]
Henry Draper Catalog HD 69830 [2]
Gliese catalog FY 302 [3]
Hipparcos catalog HIP 40693 [4]
SAO catalog SAO 154093 [5]
Tycho catalog TYC 5435-2991-1 [6]Template: Infobox star / maintenance / specification of the TYC catalog
2MASS catalog 2MASS J08182389-1237541 [7]
Other names LHS 245
annotation
  1. ↑ Calculated from apparent brightness and distance.

HD 69830 is a yellow-orange star in the aft deck of the ship (Puppis) constellation , around which both an asteroid belt and three exoplanets have been detected. The star has no proper name, so its catalog number is used as a designation in the Henry Draper catalog . HD 69830 is one of the stars closer to the sun and can barely be seen with the naked eye under favorable conditions. The mass, luminosity and surface temperature are slightly lower than those of the sun. It is about 41  light years from Earth.

companion

The asteroid belt was with infrared images from the Spitzer Space Telescope of NASA watched. It is about 25 times as massive as the asteroid belt between Mars and Jupiter.

HD 69830's planetary system is unusual in that Jupiter-sized gas giants do not exist, or at least have not yet been discovered. The mass of the three known exoplanets HD 69830 b , HD 69830 c and HD 69830 d lie between the earth and the planet Neptune or just above it. They orbit the star at intervals of 0.08 and 0.19 and 0.63 AU with orbital times of 8.7 and 31.6 and 197 days. Apart from the orbital time and that of the mass, no data are known, but the surface temperatures can be extrapolated. The two inner planets could be representatives of the so-called super - earths - that is, terrestrial planets with a solid surface and a multiple of the earth's mass. Their surfaces would heat up to several hundred degrees because of the short distance to the central star. The third planet is probably more of a Neptune-like gas planet. If it were also constructed similarly to the Earth, water could theoretically exist on it in liquid form. The three planet HD 69830 were from HARPS - spectrograph of the 3.6-meter telescope at the La Silla Observatory of the European Southern Observatory (ESO) detected.

literature

Web links

Commons : HD 69830  - Collection of images, videos and audio files

Individual evidence

  1. ↑ a b c d HD 69830. In: SIMBAD . Center de Données astronomiques de Strasbourg , accessed December 7, 2018 .
  2. ↑ a b Hipparcos catalog (ESA 1997)
  3. ↑ a b HD 69830. In: NASA Exoplanet Archive . Retrieved December 7, 2018 .
  4. ↑ a b c Bright Star Catalog
  5. ↑ a b c d e HD 69830 d. In: Extrasolar Planets Encyclopaedia . Retrieved December 7, 2018 .
  6. ^ Trio of Neptunes and their Belt: HARPS Instrument Finds Unusual Planetary System. ESO - Science release, May 18, 2006