21 Arietis
| Observation data Epoch J2000 Equinox J2000 |
|
|---|---|
| Constellation | Aries |
| Right ascension | 02h 15m 42.77662s[1] |
| Declination | +25° 02′ 34.9627″[1] |
| Apparent magnitude (V) | 5.57[2] (6.40/6.48)[3] |
| Characteristics | |
| Spectral type | F6 V[4] |
| U−B color index | +0.00[5] |
| B−V color index | +0.50[5] |
| Astrometry | |
| Radial velocity (Rv) | –44.3 km/s |
| Proper motion (μ) | RA: –89.72[1] mas/yr Dec.: –86.42[1] mas/yr |
| Parallax (π) | 19.58 ± 0.61[1] mas |
| Distance | 167 ± 5 ly (51 ± 2 pc) |
| Absolute magnitude (MV) | 2.03[2] |
| Orbit[6] | |
| Period (P) | 23.70 ± 0.12 yr |
| Semi-major axis (a) | 0.2353 ± 0.0011" |
| Eccentricity (e) | 0.6816 ± 0.0037 |
| Inclination (i) | 104.52 ± 0.16° |
| Longitude of the node (Ω) | 236.44 ± 0.22° |
| Periastron epoch (T) | 1986.192 ± 0.012 |
| Argument of periastron (ω) (secondary) |
84.16 ± 0.16° |
| Details | |
| 21 Ari A | |
| Surface gravity (log g) | 4.12[7] cgs |
| Temperature | 6,299[7] K |
| Metallicity [Fe/H] | +0.02[7] dex |
| Rotational velocity (v sin i) | 12.6[8] km/s |
| Age | 2.2[2] Gyr |
| Other designations | |
21 Arietis (abbreviated 21 Ari) is a binary star[3] system in the northern constellation of Aries. 21 Arietis is the Flamsteed designation. It has a combined apparent visual magnitude is 5.57;[2] the brighter member is magnitude 6.40 while the fainter star is magnitude 6.48.[3] The distance to this star system, based upon an annual parallax shift of 19.58 mas,[1] is 167 light-years (51 parsecs). The pair orbit each other with a period of 23.70 years and an eccentricity of 0.68.[3]
References
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