Alpha Cephei
Sign in to saveAlso known as Alderamin, 1RXS J211837.1+623513, α Cephei, α Cep, GJ 826, HIP 105199, HIC 105199, ROT 3108
star in the constellation of Cepheus
Key facts
- Constellation
- Cepheus
- Right ascension
- 21 18 34.7723
- Declination
- +62 ° 35 ′ 08.069 ″
- Evolutionary stage
- Subgiant
- Spectral type
- A8Vn or A7IV-V
- U b color index
- +0.12
- B v color index
- +0.21
- Variable type
- δ Sct + γ Dor
via Wikipedia infobox
Wikidata facts
- Instance of
- pulsating variable star
- Part of
- Castor Moving Group
- Constellation
- Cepheus
- Distance from Earth
- 48.8
- Radius
- 2.3
- Mass
- 1.74
- Image
- Cepheus constellation map-fr.png
Show 16 more facts
- catalog code
- TYC 4252-1870-1
- spectral class
- A5
- stellar rotational velocity
- 190
- apparent magnitude
- 2.428267
- effective temperature
- 7300
- right ascension
- 319.644884697
- declination
- 62.585574464
- parallax
- 66.84
- radial velocity
- -5.5
- epoch
- J2000.0
- metallicity
- 0.36
- surface gravity
- 1600
- absolute magnitude
- 1.57
- right ascension component of proper motion
- 151
- declination component of proper motion
- 49
- age estimated by a dating method
- 0.82
via Wikidata · CC0
~4 min read
Encyclopedic overview
Alpha Cephei is a second magnitude star in the northern constellation of Cepheus. It has the official name Alderamin, pronounced /ælˈdɛrəmɪn/; Alpha Cephei is its Bayer designation, which is Latinized from α Cephei and abbreviated Alpha Cep or α Cep. 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.
Nomenclature
Excerpted from Wikipedia’s “Alpha Cephei” article, available under the CC BY-SA 4.0 licence.