33 Cygni

33 Cygni
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 20h 13m 23.86661s[1]
Declination +56° 34′ 03.7999″[1]
Apparent magnitude (V) 4.28[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A3 IV–Vn[4]
B−V color index 0.114±0.001[2]
Astrometry
Radial velocity (Rv)−16.13±2.53[5] km/s
Proper motion (μ) RA: +61.82[1] mas/yr
Dec.: +82.18[1] mas/yr
Parallax (π)20.48 ± 0.12 mas[1]
Distance159.3 ± 0.9 ly
(48.8 ± 0.3 pc)
Absolute magnitude (MV)0.84[2]
Details[3]
Mass2.33±0.01 M☉
Radius2.76[6] R☉
Luminosity44.3±1.0 L☉
Temperature8,395+97
−96 K
Rotational velocity (v sin i)243 km/s
Age400[7] Myr
Other designations
33 Cyg, BD+56°2376, FK5 758, HD 192696, HIP 99655, HR 7740, SAO 32378, WDS J20145+3648A[8]
Database references
SIMBADdata

33 Cygni is a single[7] star located 159 light years away in the northern constellation Cygnus. It is visible to the naked eye as a white-hued star with an apparent visual magnitude of 4.28.[2] The star is moving closer to the Earth with a heliocentric radial velocity of −16 km/s.[5] Eggen (1995) listed it as a proper motion candidate for membership in the IC 2391 supercluster.[9]

This star has a stellar classification of A3 IV–Vn,[4] showing a spectrum with traits intermediate between an A-type main-sequence star and an evolving subgiant star. The 'n' suffix indicates "nebulous" absorption lines due to rapid rotation. It is about 400[7] million years old with a high projected rotational velocity of 243 km/s.[3] This rate of spin is giving the star an oblate shape with a pronounced equatorial bulge that is an estimated 28% wider than the polar radius.[10]

33 Cyg has 2.33[3] times the mass of the Sun and 2.76[6] times the Sun's radius. The star is radiating 44 times the Sun's luminosity from its photosphere at an effective temperature of 8,395 K.[3] It displays an infrared excess that suggests an orbiting debris disk with a temperature of 500 K at a mean distance of 1.80 AU from the host star.[6]

  1. ^ a b c d e Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Becker2015 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Cotten2016 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference derosa2014 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggen1995 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference vanBelle2012 was invoked but never defined (see the help page).