HD 210277
HD 210277 is a star of magnitude 7 mag in the constellation Aquarius . The yellow dwarf star of the spectral type G0V is similar in size, luminosity and diameter to our sun. The age of HD 210277 is estimated to be 12 billion years (the sun is less than 5 billion years old). Due to its 69 light-year distance from the solar system , the star is only visible with telescopes and binoculars. In 1998 a companion was discovered spectroscopically, which orbits the star at a distance of 1.138 ± 0.066 AU and bears the systematic designation HD 210277 b .
HD 210277 b
HD 210277 b was discovered in 1998 by the California and Carnegie Planet Search Team by determining the radial velocity . The discovered planet has a mass at least 24% greater than Jupiter and orbits its sun at about the same distance as Earth orbits the sun, but its orbit is significantly more eccentric (i.e. the planet's distance from the sun fluctuates relatively strongly).
Based on data from the astrometry satellite Hipparcos , a group of scientists suggested in 2000 that the planet's inclination be assumed to be 175.8 ° and that the actual mass should be 18 times the mass of Jupiter. This would make the companion of HD 210277 not a planet, but a brown dwarf . However, this claim was not confirmed and the probability that the assumptions or statements are correct is very low due to statistical considerations.
Individual evidence
- ^ G. Gonzalez, G. Wallerstein, SH Saar: Parent Stars of Extrasolar Planets. IV.14 Herculis, HD 187123, and HD 210277 . In: Astrophysical Journal . 511, 1999, pp. L111 - L114. ( Page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
- ^ Butler, R. et al .: Catalog of Nearby Exoplanets . In: The Astrophysical Journal . 646, 2006, pp. 505 - 522. ( Page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice. ( Online version )
- ^ GW Marcy, RP Butler, SS Vogt, D. Fischer, MC Liu: Two New Candidate Planets in Eccentric Orbits . In: Astrophysical Journal . 520, 1999, pp. 239 - 247. ( Page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
- ^ I. Han, DC Black, G. Gatewood: Preliminary Astrometric Masses for Proposed Extrasolar Planetary Companions . In: Astrophysical Journal . 548, 2001, pp. L57-L60. ( Page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
- ^ DE Trilling, RH Brown, AS Rivkin: Circumstellar Dust Disks around Stars with Known Planetary Companions . In: Astrophysical Journal . 529, 2000, pp. 499 - 505. ( Page no longer available , search in web archives ) Info: The link was automatically marked as defective. Please check the link according to the instructions and then remove this notice.
