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Alpha Cephei

"Alderamin" redirects here. It is not to be confused with Aldebaran or Alderaan.
α Cephei
Location of α Cephei (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Cepheus
Right ascension 21h 18m 34.7715s[1]
Declination +62° 35′ 08.061″[1]
Apparent magnitude (V) 2.46[2]
Characteristics
Spectral type A8Vn[3] or A7IV-V[4]
U−B color index +0.12[5]
B−V color index +0.21[5]
Variable type suspected δ Sct[6]
Astrometry
Radial velocity (Rv)−10[1] km/s
Proper motion (μ) RA: +150.55[7] mas/yr
Dec.: 49.09[7] mas/yr
Parallax (π)66.50 ± 0.11 mas[7]
Distance49.05 ± 0.08 ly
(15.04 ± 0.02 pc)
Absolute magnitude (MV)1.57[8]
Details[4]
Mass2.00±0.15 M☉
Radius2.175±0.046 (polar)
2.823±0.097 (equator) R☉
Luminosity17[9] L☉
Surface gravity (log g)3.99[9] cgs
Temperature8,440+430
−700 (polar)
7,600 (equator) K
Metallicity [Fe/H]0.09 dex
Rotation12.11±0.26 h
Rotational velocity (v sin i)283±19 km/s
Age820 Myr
Other designations
Alderamin, α Cep, 5 Cep, AG+62° 1226, BD+61°2111, FK5 803, GJ 826, HD 203280, HIP 105199, HR 8162, SAO 19302, CCDM J21186+6236A, 2MASS J21183475+6235081[1]
Database references
SIMBADdata

Alpha Cephei (α Cephei, abbreviated Alpha Cep, α Cep), officially named Alderamin /ælˈdɛrəmɪn/,[10][11] is a second magnitude star in the constellation of Cepheus near the northern pole. The star is relatively close to Earth at 49 light years (ly) and drifting closer with a heliocentric radial velocity of about −16 km/s.

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  2. ^ Cite error: The named reference AAVSO was invoked but never defined (see the help page).
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  4. ^ a b Cite error: The named reference vanBelle2006 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference MERMILLIOD was invoked but never defined (see the help page).
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  7. ^ a b c Cite error: The named reference LEEUWEN was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference aaa361_614 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference aass85_3_1015 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Kunitzsch was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference IAU-CSN was invoked but never defined (see the help page).
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