  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Andromeda |
| Right ascension | 01h 02m 54.25356s [1] |
| Declination | +41° 20′ 42.7673″ [1] |
| Apparent magnitude (V) | 5.95 [2] |
| Characteristics | |
| Spectral type | kA3hA7VmA9 [3] |
| B−V color index | +0.161±0.009 [2] |
| Astrometry | |
| Radial velocity (Rv) | +3.1±0.9 [4] km/s |
| Proper motion (μ) | RA: −17.558 [1] mas/yr Dec.: −18.400 [1] mas/yr |
| Parallax (π) | 9.5725±0.0805 mas [1] |
| Distance | 341 ± 3 ly (104.5 ± 0.9 pc) |
| Absolute magnitude (MV) | 0.80 [2] |
| Details | |
| Radius | 1.2 [5] R☉ |
| Luminosity | 39.95 [2] L☉ |
| Surface gravity (log g) | 3.93 [6] cgs |
| Temperature | 8,073 [6] K |
| Metallicity [Fe/H] | +0.13 [6] dex |
| Rotational velocity (v sin i) | 34 [6] km/s |
| Other designations | |
| 39 And, BD+40°209, HD 6116, HIP 4903, HR 290, SAO 36874, PPM 43575, WDS J01029+4121A [7] | |
| Database references | |
| SIMBAD | data |
39 Andromedae, abbreviated 39 And, is a double star in the northern constellation Andromeda. 39 Andromedae is the Flamsteed designation. Its apparent visual magnitude is 5.95, [2] which indicates it is near the lower limit on visibility to the naked eye. The distance to this star, as estimated from its annual parallax shift of 9.57 mas , [1] is 341 light years. It is a suspected member of the Ursa Major Moving Group, although King et al. (2003) list it as a probable non-member. [8]
The brighter component is a confirmed Am star [9] with a stellar classification of kA3hA7VmA9. [3] This notation indicates its spectrum displays the calcium K line of an A3 star, the hydrogen lines of an A7 V, or A-type main-sequence star, and the metal lines of an A9 star. It is radiating 40 [2] times the Sun's luminosity from its photosphere at an effective temperature of 8,073 K. [6] As of 2015, the magnitude 12.48 companion star is located at an angular separation of 20.5″ along a position angle of 3° from the primary. [10]
