HD 178911

HD 178911 is a triple star system in the constellation Lyra. The secondary star (designated as HD 178911 B) has an apparent magnitude of 6.74 and a spectral type of G1V, which is very similar to our Sun at a distance of 160 light years. The age of the star is slightly older and have significantly higher metallicity than our Sun.

HD 178911
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Lyra
Right ascension 19h 09m 04.3838s
Declination +34° 36′ 01.625″
Apparent magnitude (V) 6.74
Distance160 ly
(49.0 pc)
Spectral typeG1V
Other designations
BD+34° 3439, HIP 94076, HR 7272, LTT 15608, SAO 67879
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

Stellar system

The HD 178911 system consists of HD 178911A and HD 178911B in a 1300-day orbit with HD 178911B being a more distant common proper motion companion and HD 178911A is in fact a tight binary pair consisting of HD 178911Aa and Ab.[1] An additional companion HD 178911C is a chance optical alignment and is not part of the system.[2]

Planetary system

In 2001 an extrasolar planet was discovered in orbit around HD 178911B.[3][4]

The HD 178911 planetary system[5]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b >7.35 ± 0.60 MJ 0.345 ± 0.20 71.511 ± 0.011 0.139 ± 0.014 — —

See also
  • List of extrasolar planets

References
  1. McAlister, H.A.; et al. (1987). "ICCD speckle observations of binary stars. I - A survey for duplicity among the bright stars". The Astronomical Journal. 93: 183–194. Bibcode:1987AJ.....93..183M. doi:10.1086/114297.
  2. Farrington, C. D.; et al. (2014). "Separated Fringe Packet Observations with the CHARA Array. II. omega Andromeda, HD 178911, and xi Cephei" (PDF). The Astronomical Journal. 148 (3). 48. arXiv:1407.0639. Bibcode:2014AJ....148...48F. doi:10.1088/0004-6256/148/3/48. S2CID 12909818. Archived from the original (PDF) on 2014-10-16.
  3. "Exoplanets: The Hunt Continues!" (Press release). Garching, Germany: European Southern Observatory. April 4, 2001. Retrieved December 29, 2012.
  4. Zucker, S.; et al. (2002). "A Planet Candidate in the Stellar Triple System HD 178911". The Astrophysical Journal. 568 (1): 363–368. arXiv:astro-ph/0111550. Bibcode:2002ApJ...568..363Z. doi:10.1086/338892. S2CID 16548934.
  5. Butler, R. P.; et al. (2006). "Catalog of Nearby Exoplanets". The Astrophysical Journal. 646 (1): 505–522. arXiv:astro-ph/0607493. Bibcode:2006ApJ...646..505B. doi:10.1086/504701. S2CID 119067572.


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