HD 196885

From Wikipedia, the free encyclopedia
Jump to: navigation, search

HD 196885 is a 6th magnitude binary star in the constellation Delphinus. According to its parallax of 29.83 milliarcseconds,[1] it is located at a distance of 109 light years from Earth. In 2004, a planet was announced to be orbiting the star in a 386-day orbit.[2] Follow-up work published in 2008 did not confirm the original candidate but instead found evidence of a planet in a 1349-day orbit.[3]

The star BD+10 4351B, located 192 arcseconds away from HD 196885 is located at the same distance and may be a physically bound companion star, in which case HD 196885 is a triple system.[4] If it is bound, then the separation is at least 6600 AU (the separation along the line-of-sight is unknown, so this value represents a lower limit on the true separation).

HD 196885 A[edit]

HD 196885 A
Observation data
Epoch 2000      Equinox 2000
Constellation Delphinus
Right ascension 20h 39m 51.8756s
Declination +11° 14′ 58.737″
Apparent magnitude (V) 6.39
Distance 112 ly
(34.3 pc)
Spectral type F8IV
Other designations
BD+10° 4351, GC 28784, GCRV 12946, HIP 101966, HR 7907, SAO 106360, WDS 20399+1115
Database references
SIMBAD data
Extrasolar Planets
Encyclopaedia
data

HD 196885 A is an F6IV star. It has a mass of 1.33 solar masses and a radius of 1.79 times that of our Sun.[5]

Planetary system[edit]

The HD 196885 system
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b >2.96 MJ 2.60[6] 1349 0.48 ± 0.02

HD 196885 B[edit]

HD 196885 B
Observation data
Epoch 2000      Equinox 2000
Constellation Delphinus
Right ascension 20h 39m 51s
Declination +11° 14′ 58″
Distance 112 ly
(34.3 pc)
Spectral type M1V

HD 196885 B is a red dwarf star separated by 0.7 arcseconds from the primary star.[4] At a distance of 112 light years, this corresponds to a separation of 24 AU between the stars.[7] Since the separation along the line-of-sight is unknown, this represents a lower limit on the true separation.

See also[edit]

References[edit]

  1. ^ van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
  2. ^ "The Planet Around HD 196885". California & Carnegie Planet Search Team (Internet Archive link). Archived from the original on 2004-12-27. Retrieved 2008-08-19. 
  3. ^ Correia, A. C. M.; Udry, S.; Mayor, M.; Eggenberger, A.; Naef, D.; Beuzit, J.-L.; Perrier, C.; Queloz, D.; Sivan, J.-P.; Pepe, F.; Santos, N. C.; Ségransan, D. (2008). "The ELODIE survey for northern extra-solar planets. IV. HD 196885, a close binary star with a 3.7-year planet". Astronomy and Astrophysics 479 (1): 271–275. Bibcode:2008A&A...479..271C. doi:10.1051/0004-6361:20078908. 
  4. ^ a b "HD 196885 A page". Geneva Observatory. Retrieved 2008-08-19. 
  5. ^ Schneider, J. "Notes for star HD 196885". The Extrasolar Planets Encyclopaedia. Retrieved 2008-08-19. 
  6. ^ Chauvin et al. (2011). "Planetary systems in close binary stars: the case of HD 196885" (abstract). Astronomy and Astrophysics 528: A8. Bibcode:2011A&A...528A...8C. doi:10.1051/0004-6361/201015433.  (web preprint)
  7. ^ Chauvin, G. et al. (2007). "Characterization of the long-period companions of the exoplanet host stars: HD 196885, HD 1237 and HD 27442". Astronomy and Astrophysics 475 (2): 723–727. arXiv:0710.5918. Bibcode:2007A&A...475..723C. doi:10.1051/0004-6361:20067046. 

External links[edit]

Coordinates: Sky map 20h 39m 51.8756s, +11° 14′ 58.737″