Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cygnus |
Right ascension | 21h 34m 46.58574s [1] |
Declination | +38° 32′ 02.6267″ [1] |
Apparent magnitude (V) | 4.87 [2] |
Characteristics | |
Spectral type | K0.5 III Fe0.5 [3] or K0.5 III CN 0.5 [4] + M5 [5] |
B−V color index | 1.092 [6] |
Astrometry | |
Radial velocity (Rv) | −68.12±0.11 [6] km/s |
Proper motion (μ) |
RA: +113.665
[1]
mas/
yr Dec.: +100.403 [1] mas/ yr |
Parallax (π) | 14.2468 ± 0.1339 mas [1] |
Distance | 229 ± 2
ly (70.2 ± 0.7 pc) |
Absolute magnitude (MV) | 0.62 [2] |
Details | |
Mass | 1.70 [7] M☉ |
Radius | 14 [6] R☉ |
Luminosity | 69 [7] L☉ |
Surface gravity (log g) | 2.68±0.04 [8] cgs |
Temperature | 4,640±25 [7] K |
Metallicity [Fe/H] | 0.18 [8] dex |
Rotational velocity (v sin i) | 1.4 [6] km/s |
Age | 900±200 [8] Myr |
Other designations | |
Database references | |
SIMBAD | data |
72 Cygni is a star in the northern constellation of Cygnus, located 299 light years from the Sun [1] and a member of the Hercules stream. [8] It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.87. [2] 72 Cyg is moving closer to the Earth with a heliocentric radial velocity of −68 km/s. [6] It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.154 ″ per year. [10]
This is an aging giant star with a stellar classification of K0.5 III Fe0.5, [3] where the suffix notation indicates a mild underabundance of iron in the spectrum. It has 1.7 [7] times the mass of the Sun but has expanded to 14 [6] times the Sun's radius. The star is radiating 69 [7] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,640 K. [7]
72 Cygni has a wide companion at an angular separation of 66.1″, corresponding to a projected separation of 4,690 AU. This star has a J band (infrared) magnitude of 13.224±0.025 and a class of M5. [5]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Cygnus |
Right ascension | 21h 34m 46.58574s [1] |
Declination | +38° 32′ 02.6267″ [1] |
Apparent magnitude (V) | 4.87 [2] |
Characteristics | |
Spectral type | K0.5 III Fe0.5 [3] or K0.5 III CN 0.5 [4] + M5 [5] |
B−V color index | 1.092 [6] |
Astrometry | |
Radial velocity (Rv) | −68.12±0.11 [6] km/s |
Proper motion (μ) |
RA: +113.665
[1]
mas/
yr Dec.: +100.403 [1] mas/ yr |
Parallax (π) | 14.2468 ± 0.1339 mas [1] |
Distance | 229 ± 2
ly (70.2 ± 0.7 pc) |
Absolute magnitude (MV) | 0.62 [2] |
Details | |
Mass | 1.70 [7] M☉ |
Radius | 14 [6] R☉ |
Luminosity | 69 [7] L☉ |
Surface gravity (log g) | 2.68±0.04 [8] cgs |
Temperature | 4,640±25 [7] K |
Metallicity [Fe/H] | 0.18 [8] dex |
Rotational velocity (v sin i) | 1.4 [6] km/s |
Age | 900±200 [8] Myr |
Other designations | |
Database references | |
SIMBAD | data |
72 Cygni is a star in the northern constellation of Cygnus, located 299 light years from the Sun [1] and a member of the Hercules stream. [8] It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.87. [2] 72 Cyg is moving closer to the Earth with a heliocentric radial velocity of −68 km/s. [6] It has a relatively high proper motion, traversing the celestial sphere at the rate of 0.154 ″ per year. [10]
This is an aging giant star with a stellar classification of K0.5 III Fe0.5, [3] where the suffix notation indicates a mild underabundance of iron in the spectrum. It has 1.7 [7] times the mass of the Sun but has expanded to 14 [6] times the Sun's radius. The star is radiating 69 [7] times the Sun's luminosity from its enlarged photosphere at an effective temperature of 4,640 K. [7]
72 Cygni has a wide companion at an angular separation of 66.1″, corresponding to a projected separation of 4,690 AU. This star has a J band (infrared) magnitude of 13.224±0.025 and a class of M5. [5]