Gamma Cygni
Sign in to saveAlso known as Sadr, 37 Cygni, γ Cygni, HIP 100453, HIC 100453, 37 Cyg, γ Cyg, HD 194093
star in the northern constellation Cygnus
Key facts
- Constellation
- Cygnus
- Right ascension
- 20 22 13.70184
- Declination
- +40 ° 15 ′ 24.0450 ″
- Spectral type
- F8 Iab
- U b color index
- +0.54
- B v color index
- +0.67
- Variable type
- suspected
via Wikipedia infobox
Wikidata facts
- Instance of
- yellow supergiant
- Part of
- Northern Cross
- Constellation
- Cygnus
- Distance from Earth
- 560
- Variable-star type
- Cepheid variable
Show 17 more facts
- catalog code
- UBV M 24788
- spectral class
- F8p
- stellar rotational velocity
- 20
- apparent magnitude
- 2.113725
- right ascension
- 305.55710787667
- declination
- 40.25667361143
- effective temperature
- 6000
- parallax
- 1.78
- radial velocity
- -5.906
- epoch
- J2000.0
- metallicity
- -0.04
- surface gravity
- 3.55
- luminosity
- 33023
- absolute magnitude
- -4.54
- right ascension component of proper motion
- -2
- declination component of proper motion
- 1
- age estimated by a dating method
- 12
Sources (3)
via Wikidata · CC0
~4 min read
Encyclopedic overview
Gamma Cygni is a star in the northern constellation of Cygnus, forming the intersection of an asterism of five stars called the Northern Cross. It is officially named Sadr /ˈsædər/; Gamma Cygni is its Bayer designation, which that is Latinized from γ Cygni, and abbreviated Gamma Cyg or γ Cyg. Based upon parallax measurements obtained during the Hipparcos mission, it is approximately 1,800 light-years (560 parsecs) from the Sun.
It forms the primary or 'A' component of a multiple star system designated WDS J20222+4015 (the secondary or 'BCD' component is WDS J20222+4015BCD, a close triplet of stars 41" away from γ Cygni).
Excerpted from Wikipedia’s “Gamma Cygni” article, available under the CC BY-SA 4.0 licence.