HD 166
| Observation data Epoch J2000.0 Equinox J2000.0 |
|
|---|---|
| Constellation | Andromeda |
| Right ascension | 00h 06m 36.78482s[2] |
| Declination | +29° 01′ 17.4038″[2] |
| Apparent magnitude (V) | 6.09[3] |
| Characteristics | |
| Spectral type | G8V[4] |
| U−B color index | +0.30[3] |
| B−V color index | +0.755[3] |
| Variable type | BY Dra[5] |
| Astrometry | |
| Radial velocity (Rv) | −6.59[6] km/s |
| Proper motion (μ) | RA: 380.98 ± 0.57[2] mas/yr Dec.: −178.68 ± 0.29[2] mas/yr |
| Parallax (π) | 73.15 ± 0.56[2] mas |
| Distance | 44.6 ± 0.3 ly (13.7 ± 0.1 pc) |
| Details | |
| Mass | 0.889[4] M☉ |
| Radius | 0.9172 ± 0.0090[4] R☉ |
| Luminosity | 0.6078 ± 0.0099[4] L☉ |
| Temperature | 5,327 ± 39[4] K |
| Metallicity [Fe/H] | 0.08[4] dex |
| Rotation | 6.23 ± 0.01 days[7] |
| Age | 9.6[4] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 166 or V439 Andromedae (ADS 69 A) is a 6th magnitude star in the constellation Andromeda, approximately 45 light years away from Earth. It is a variable star of the BY Draconis type,[5] with a variation in brightness smaller than 0.2 magnitude. This is a G-type main sequence star like our Sun, yet cooler and dimmer, having a stellar classification of G8V and an effective temperature of 5,327 kelvin.[4] It appears within one degree of the star Alpha Andromedae.[8]
The star has a proper motion of 0.422 arcsecond per year (114.1° from north). It has an estimated visual luminosity of 61% of Sol. It has a diameter that is about 0.9 × Sol and has a radial velocity of -6.6 km/s. Age estimates range from as low as 200 million years old based on its chromospheric activity,[9] up to 9.6[4] billion years. X-ray emission has been detected from this star, with an estimated luminosity of 8.5 × 1028 erg s−1.[10]
An infrared excess has been detected around this star, most likely indicating the presence of a circumstellar disk at a radius of 7.5 AU. The temperature of this dust is 90 K.[11]
References
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- ↑ 2.0 2.1 2.2 2.3 2.4 Lua error in package.lua at line 80: module 'strict' not found.Vizier catalog entry
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- ↑ Autostar Suite Astronomer Edition. CD-ROM. Meade, April 2006.
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