72 Cygni

72 Cygni
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]
Distance229 ± 2 ly
(70.2 ± 0.7 pc)
Absolute magnitude (MV)0.62[2]
Details
Mass1.70[7] M☉
Radius14[6] R☉
Luminosity69[7] L☉
Surface gravity (log g)2.68±0.04[8] cgs
Temperature4,640±25[7] K
Metallicity [Fe/H]0.18[8] dex
Rotational velocity (v sin i)1.4[6] km/s
Age900±200[8] Myr
Other designations
72 Cyg, BD+37°4359, FK5 3722, HD 205512, HIP 106551, HR 8255, SAO 71480[9]
Database references
SIMBADdata

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]

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Keenan1987 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Deacon2014 was invoked but never defined (see the help page).
  6. ^ a b c d e f Cite error: The named reference Massarotti2008 was invoked but never defined (see the help page).
  7. ^ a b c d e f Cite error: The named reference Luck2015 was invoked but never defined (see the help page).
  8. ^ a b c d Cite error: The named reference Ramya2016 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Lepine2005 was invoked but never defined (see the help page).