21 Arietis
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| Observation data Epoch J2000 Equinox J2000 |
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|---|---|
| Constellation | Aries |
| Right ascension | 02h 15m 42.7773s |
| Declination | +25° 02′ 34.956″ |
| Apparent magnitude (V) | 5.585 |
| Characteristics | |
| Spectral type | F6V |
| U-B color index | 0.01 |
| B-V color index | 0.49 |
| Astrometry | |
| Radial velocity (Rv) | -44.3 km/s |
| Proper motion (μ) | RA: -88.69 mas/yr Dec.: -87.16 mas/yr |
| Parallax (π) | 20.77 ± 0.89 mas |
| Distance | 157 ± 7 ly (48 ± 2 pc) |
| Absolute magnitude (MV) | 6.051 |
| Details | |
| Mass | 1,7 M☉ |
| Radius | 1,4 R☉ |
| Luminosity | 6 L☉ |
| Temperature | 6,000–7,500 K |
| Orbit | |
| Companion | CCDM 02157+2503 B |
| Period (P) | 19.35 yr |
| Semimajor axis (a) | 0.17" |
| Eccentricity (e) | 0.71 |
| Inclination (i) | 135.6° |
| Longitude of the node (Ω) | 134.3° |
| Periastron epoch (T) | 1975.94 |
| Other designations | |
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CCDM J02157+2503, GCRV 1242, IRAS 02128+2448, TD1 1310, 2MASS J02154278+2502349, TYC 1769-1309-1, COU 79AB, GSC 01769-01309, N30 460, UBV M 8823, COU 79, HD 13872, PMC 90-93 697, uvby98 100013872, AG+24° 201, HIC 10535, PPM 91494, YZ 24 681, BD+24° 329, HIP 10535, SAO 75238, WDS J02157+2503, FK5 1059, HR 657, GC 2706, IDS 02101+2435, SRS 31059.
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| Database references | |
| SIMBAD | data |
| Data sources: | |
| Hipparcos Catalogue, CCDM (2002), Bright Star Catalogue (5th rev. ed.) |
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21 Arietis is a star in the constellation Aries. Its apparent magnitude is 5.57.
[edit] References
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