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[1][2] |
| 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 | 1,044 ± 199 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
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.
| 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
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