Gamma Cephei
Sign in to saveAlso known as Alrai, Errai, 35 Cephei, 35 Cep, γ Cep, γ Cephei, GJ 903, GCRV 14826
star in the constellation of Cephei
Key facts
- Constellation
- Cepheus
- Right ascension
- 23 39 20.910
- Declination
- +77 ° 37 ′ 56.51 ″
- Evolutionary stage
- Red-giant branch
- Spectral type
- K1III-IV CN1
- U b color index
- +0.94
- B v color index
- +1.03
- Variable type
- Suspected
via Wikipedia infobox
Wikidata facts
- Constellation
- Cepheus
- Child body
- Gamma Cephei Ab
- Distance from Earth
- 13.79
- Diameter
- 6860000
- Radius
- 4.9
- Mass
- 1.4
- Image
- Cepheus constellation map.png
Show 17 more facts
- catalog code
- UBV M 27166
- spectral class
- K0IV
- topic's main category
- Category:Gamma Cephei
- radial velocity
- -43.668
- apparent magnitude
- 3.22
- metallicity
- 0.15
- parallax
- 72.5167
- absolute magnitude
- 2.52
- effective temperature
- 4800
- epoch
- J2000.0
- stellar rotational velocity
- 5.0
- surface gravity
- 2000
- right ascension component of proper motion
- -65
- declination component of proper motion
- 154
- age estimated by a dating method
- 6.6
- right ascension
- 354.83712672241
- declination
- 77.63236410594
Sources (1)
via Wikidata · CC0
~5 min read
Encyclopedic overview
Gamma Cephei is a binary star system in the northern constellation of Cepheus. Its name is a Bayer designation that is Latinized from γ Cephei, and abbreviated Gamma Cep or γ Cep. This system is visible to the naked eye as a point of light with a combined apparent visual magnitude of 3.21. Based on parallax measurements, it is located at a distance of approximately 45 light-years from Earth.
The primary, Gamma Cephei A, is officially named Errai, pronounced /ɛˈreɪ.iː/, the traditional name of the system. It is a stellar class K1 orange giant or subgiant star. The companion, Gamma Cephei B, is a low mass red dwarf star. A conformed exoplanet is orbiting the primary; it is designated Gamma Cephei Ab, later named Tadmor.
Excerpted from Wikipedia’s “Gamma Cephei” article, available under the CC BY-SA 4.0 licence.