HD 47536
Star in the constellation Canis Major
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HD 47536 is a single[9] star in the southern constellation of Canis Major. It has an orange hue and is dimly visible to the naked eye with an apparent visual magnitude of +5.25.[1] The star is located at a distance of approximately 408 light years from the Sun based on parallax. It is drifting further away with a radial velocity of 80 km/s.[2]
Reproduced from the Digital Sky Survey.
  | |
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Canis Major[1] |
| Right ascension | 06h 37m 47.61811s[2] |
| Declination | −32° 20′ 23.0405″[2] |
| Apparent magnitude (V) | +5.25[1] |
| Characteristics | |
| Evolutionary stage | red giant branch[3] |
| Spectral type | K1 III[4] |
| B−V color index | +1.177±0.002[1] |
| Astrometry | |
| Radial velocity (Rv) | +79.64±0.13[2] km/s |
| Proper motion (μ) | RA: +107.755 mas/yr[2] Dec.: +65.122 mas/yr[2] |
| Parallax (π) | 7.9902±0.0535 mas[2] |
| Distance | 408 ± 3 ly (125.2 ± 0.8 pc) |
| Absolute magnitude (MV) | −0.17±0.15[5] |
| Details[5] | |
| Mass | 0.94±0.06 M☉ |
| Radius | 23.08+0.68 −0.81[6] R☉ |
| Luminosity | 177.2±2.3[6] L☉ |
| Surface gravity (log g) | 1.72±0.08 cgs |
| Temperature | 4,384+79 −64[6] K |
| Metallicity [Fe/H] | −0.68 dex |
| Rotation | 625 days[7] |
| Rotational velocity (v sin i) | 1.93±0.50[3] km/s |
| Age | 9.33±1.88 Gyr |
| Other designations | |
| CD−32°3216, HD 47536, HIP 31688, HR 2447, SAO 197019, GSC 07091-01257[8] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | data |
This is an aging, metal-poor giant star with a stellar classification of K1 III.[4] It is about 9.3 billion years old with 94% of the mass of the Sun. Having exhausted the supply of hydrogen at its core, the star cooled and expanded to 23 times the Sun's radius.[6] The star is spinning slowly, taking 1.71 years to complete its sidereal rotation. It is radiating 177[6] times the luminosity of the Sun from its swollen photosphere at an effective temperature of 4,384 K.[6] As of 2015, at least one planet is known to orbit this star.[10]
Planetary system
A planetary companion to this star, HD 47536 b, was discovered in 2003 by a team led by J. Setiawan.[11][3] A second planet candidate, HD 47536 c, was proposed in 2007,[12] but was not confirmed by any subsequent study. A follow-up study by Soto et al. in 2015 did not find any evidence of this second planet.[10]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | ≥4.0±0.4 MJ | 1.12±0.005 | 434.9±2.6 | 0.3±0.1 | — | — |