60 Andromedae
Star system in the constellation Andromeda
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60 Andromedae is a star system in the northern constellation of Andromeda, located to the east-northeast of Gamma Andromedae. 60 Andromedae is the Flamsteed designation (abbreviated 60 And), though the star also bears the Bayer designation b Andromedae.[11] It is bright enough to be seen by the naked eye on a dark night, having an apparent visual magnitude of 4.82.[3] Based upon parallax measurements, it is located at a distance of approximately 620 light-years (190 parsecs) from Earth.[2] The system is drifting closer with a heliocentric radial velocity of –46 km/s.[5]
 | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Andromeda[1] |
| Right ascension | 02h 13m 13.322s[2] |
| Declination | +44° 13′ 53.93″[2] |
| Apparent magnitude (V) | +4.82[3] |
| Characteristics | |
| Spectral type | K3.5 III Ba0.4[4] |
| U−B color index | +1.74[3] |
| B−V color index | +1.48[3] |
| Astrometry | |
| Radial velocity (Rv) | –46.3[5] km/s |
| Proper motion (μ) | RA: –20.90 mas/yr[6] Dec.: –14.46 mas/yr[6] |
| Parallax (π) | 5.2634±0.2576 mas[2] |
| Distance | 620 ± 30 ly (190 ± 9 pc) |
| Absolute magnitude (MV) | −1.19[1] |
| Orbit[7] | |
| Period (P) | 748.2±0.4 days |
| Semi-major axis (a) | 2.4±0.6 mas |
| Eccentricity (e) | 0.80 |
| Inclination (i) | 54.1±19.9° |
| Longitude of the node (Ω) | 344.5±10.3° |
| Periastron epoch (T) | 37886±11 HJD |
| Argument of periastron (ω) (secondary) | 358±6° |
| Semi-amplitude (K1) (primary) | 4.88 km/s |
| Details | |
| 60 And A | |
| Mass | 2.0+0.7 −0.3[8] M☉ |
| Luminosity | 685[1] L☉ |
| Surface gravity (log g) | 1.70±0.44[9] cgs |
| Temperature | 4,054±42[9] K |
| Metallicity [Fe/H] | −0.13±0.12[9] dex |
| Age | 2.02[10] Gyr |
| 60 And B | |
| Mass | 0.5±0.1[8] M☉ |
| Other designations | |
| b Andromedae[11], BD+43 447, HD 13520, HIP 10340, HR 643, SAO 37867, PPM 44882, IRAS 02100+4359[12] | |
| Database references | |
| SIMBAD | data |
This system is known to have three components. The primary is an aging giant star with a stellar classification of K3.5 III Ba0.4, meaning that an overabundance of singly-ionized barium (Ba+ ion) is observed in the spectrum of the star, making it a barium star. This star is about 2[10] billion years old with double the mass of the Sun.[8] It is radiating 685[1] times the luminosity of the Sun from its enlarged photosphere at an effective temperature of 4,054 K.[9] The secondary component is likely a degenerate white dwarf with an orbital period of 748.2 days and an eccentricity of 0.34. There is a third component at an angular separation of 0.22 arcseconds.[4]