HD 188015

HD 188015 is an 8th magnitude star about 165.5 light-years away in the constellation of Vulpecula. It is a yellow subgiant, a Sun-like star that has ceased or is about to stop hydrogen fusion in its core. However, it is only slightly brighter than the Sun, but probably much older.

HD 188015
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Vulpecula
Right ascension 19h 52m 04.5430s[1]
Declination +28° 06′ 01.3417″[1]
Apparent magnitude (V) 8.242
Characteristics
Spectral type G5IV
Astrometry
Proper motion (μ) RA: 52.544±0.064[1] mas/yr
Dec.: −91.934±0.058[1] mas/yr
Parallax (π)19.7065 ± 0.0422[1] mas
Distance165.5 ± 0.4 ly
(50.7 ± 0.1 pc)
Details
Other designations
BD+27 3539, HIP 97769, 2MASS J19520455+2806015[2]
Database references
SIMBADdata

The star is almost twice as metal-rich as the Sun. Planets are common around such stars, and this star also has one known planet orbiting it.[3]

HD 188015 is in a binary star system, the second star is HD 188015 B, with a mass 0.210 of the Sun.[4]

The HD 188015 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
c (unconfirmed) >0.07 MJ 0.08 8.386 0.23 — —
b >1.50 ± 0.13 MJ 1.203 ± 0.070 461.2 ± 1.7 0.137 ± 0.026 — —

See also

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. "HD 188015". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-10-21.
  3. Marcy, Geoffrey W.; et al. (2005). "Five New Extrasolar Planets". The Astrophysical Journal. 619 (1): 570–584. Bibcode:2005ApJ...619..570M. CiteSeerX 10.1.1.516.6667. doi:10.1086/426384.
  4. Open Exoplanet Catalogue HD 18801


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