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]
GaiaDR2
was invoked but never defined (see the help page).Anderson2012
was invoked but never defined (see the help page).perkins1989
was invoked but never defined (see the help page).Keenan1987
was invoked but never defined (see the help page).Deacon2014
was invoked but never defined (see the help page).Massarotti2008
was invoked but never defined (see the help page).Luck2015
was invoked but never defined (see the help page).Ramya2016
was invoked but never defined (see the help page).SIMBAD
was invoked but never defined (see the help page).Lepine2005
was invoked but never defined (see the help page).