![]() ![]() Location of α Cephei (circled) |
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Observation data Epoch J2000 Equinox J2000 |
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Constellation | Cepheus |
Right ascension | 21 |
Declination | 62° 35′ 08.061″ |
Apparent magnitude (V) | 2.5141 |
Characteristics | |
Spectral type | A7IV-V |
U−B color index | +0.12 |
B−V color index | +0.21 |
Variable type | Delta Scuti |
Astrometry | |
Radial velocity (Rv) | -10 km/s |
Proper motion (μ) | RA: +150.55 mas/yr |
Parallax (π) | 66.50 ± 0.11mas |
Distance | 49.05 ± 0.08 ly (15.04 ± 0.02 pc) |
Absolute magnitude (MV) | 1.57 |
Details | |
Mass | 1.74M☉ |
Radius | 2.3R☉ |
Luminosity | 17L☉ |
Surface gravity (log g) | 3.99 |
Temperature | 7,740 ± 170K |
Rotational velocity (v sin i) | 246 km/s |
Other designations | |
Alderamin, 5 Cep, 2MASS J21183475+6235081, AG+62° 1226, BD +61°2111, CCDM J21186+6236A, FK5 803, GCTP 5139.00, Gl 826, HD 203280, HIP 105199, HR 8162, SAO 19302.
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Database references | |
SIMBAD | data |