HD 208527

HD 208527
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pegasus
Right ascension 21h 56m 23.98467s[1]
Declination +21° 14′ 23.4961″[1]
Apparent magnitude (V) +6.39
Characteristics
Spectral type M1III[2][3]
Astrometry
Radial velocity (Rv)4.79 ± 0.06[3] km/s
Proper motion (μ) RA: 2.00[1] mas/yr
Dec.: 15.30[1] mas/yr
Parallax (π)2.48 ± 0.38[1] mas
Distanceapprox. 1,300 ly
(approx. 400 pc)
Absolute magnitude (MV)–1.24[3]
Details
Mass1.6 ± 0.4[2] M☉
Radius51.1 ± 8.3[2] R☉
Surface gravity (log g)1.6 ± 0.3[3] cgs
Temperature4035 ± 65[3] K
Metallicity [Fe/H]−0.09 ± 0.16[2] dex
Rotational velocity (v sin i)3.6[3] km/s
Age2 ± 1.3[2] Gyr
Other designations
BD+20° 5046, GJ 841.1, HD 208527, HIP 108296, HR 8372, SAO 90112
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia		data

HD 208527 is a M1III red giant star located in Pegasus.

It has been considered K5V, but is now known as M1III due to radius, as well as surface gravity.[3]

Planetary system

From September 2008 to June 2012, the team B.-C. Lee, I. Han and M.-G. Park observed HD 208527 with "the high-resolution spectroscopy of the fiber-fed Bohyunsan Observatory Echelle Spectrograph (BOES) at Bohyunsan Optical Astronomy Observatory (BOAO)".

In 2012, a long-period, wide-orbiting planet was deduced by radial velocity. This was published in November, gaining the designation HD 208527 b.[2] Along with HD 220074 b this is one of the first two planets proposed around a red giant.

The HD 208527 planetary system[2]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b >9.9 ± 1.7 MJ 2.1 ± 0.2 875.5 ± 5.8 0.08 ± 0.04 — —

References

  1. 1 2 3 4 5 van Leeuwen, F.; et al. (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.
  2. 1 2 3 4 5 6 7 "hd_208527_b".
  3. 1 2 3 4 5 6 7 B.-C. Lee; I. Han; M.-G. Park (2012). "Planetary companions orbiting M giants HD 208527 and HD 220074". Astronomy & Astrophysics. 549: A2. arXiv:1211.2051. Bibcode:2013A&A...549A...2L. doi:10.1051/0004-6361/201220301.
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