HD 208527

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HD 208527
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Pegasus
Right ascension 21h 56m 23.98s[1]
Declination +21° 14′ 23.4″[1]
Apparent magnitude (V) +6.39
Characteristics
Spectral type M1III[2][1]
Astrometry
Radial velocity (Rv) 4.79 ± 0.06[2] km/s
Proper motion (μ) RA: ? mas/yr
Dec.: ? mas/yr
Parallax (π) 2.48 ± 0.38[2] ± ? mas
Distance ? ly
(320.2 ± 61.1[1] pc)
Absolute magnitude (MV) –1.24[2]
Details
Mass 1.6 ± 0.4 [1] M
Radius 51.1 ± 8.3[1] R
Luminosity L
Surface gravity (log g) 1.6 ± 0.3[2] cgs
Temperature 4035 ± 65[2] K
Metallicity -0.09 ± 0.16[1]
Rotation 51.1 ± 8.3[2]
Age 2 ± 1.3 × 109[1] years
Other designations
HD 208527, HIP 108296, HR 8372
Database references
SIMBAD data
Exoplanet Archive data
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 and surface gravity.[2]

Planetary system[edit]

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.[1] Along with HD 220074 b this is one of the first two planets proposed around a red giant.

The HD 208527 system[1]
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[edit]

  1. ^ a b c d e f g h i j "hd_208527_b". 
  2. ^ a b c d e f g h B.-C. Lee, I. Han, M.-G. Park (2012). "Planetary companions orbiting M giants HD 208527 and HD 220074". Astronomy & Astrophysics. arXiv:1211.2051. Bibcode:2013A&A...549A...2L. doi:10.1051/0004-6361/201220301.