Iota2 Cygni

For other stars with this Bayer designation, see ι Cygni.
Iota2 Cygni
Observation data
Epoch J2000      Equinox J2000
Constellation Cygnus
Right ascension 19h 29m 42.36s[1]
Declination +51° 43′ 47.2″[1]
Apparent magnitude (V) 3.76[2]
Characteristics
Spectral type A5V[3]
B−V color index +0.148±0.001[2]
Astrometry
Radial velocity (Rv)−19.5±2.7[2] km/s
Proper motion (μ) RA: +20.59[1] mas/yr
Dec.: +128.33[1] mas/yr
Parallax (π)26.88 ± 0.11 mas[1]
Distance121.3 ± 0.5 ly
(37.2 ± 0.2 pc)
Absolute magnitude (MV)+0.91[2]
Details
Mass1.80[4] M☉
Radius3.83+0.40
−0.36[5] R☉
Luminosity34.5±0.5[5] L☉
Surface gravity (log g)3.91[4] cgs
Temperature8,216±279[4] K
Rotational velocity (v sin i)240[6] km/s
Age577[4] Myr
Other designations
ι2 Cyg, 10 Cygni, BD+51° 2605, GC 26947, HD 184006, HIP 95853, HR 7420, SAO 31702[7]
Database references
SIMBADdata

Iota2 Cygni, Latinized from ι2 Cygni and often simply called ι Cygni,[8] is a single[9] star in the constellation Cygnus. It is visible to the naked eye as a white-hued point of light with an apparent visual magnitude of 3.76.[2] Located around 121.3 light-years distant from the Sun based on parallax,[1] it is drifting closer with a radial velocity of −19.5 km/s and is expected to come to within 92 light-years in around 783,000 years.[2]

This it is an A-type main-sequence star with a stellar classification of A5V,[3] a star that is currently fusing its core hydrogen. It is around 577[4] million years old and is spinning rapidly with a projected rotational velocity of 240 km/s.[6] The star has 1.8[4] times the mass of the Sun and 3.8[5] times the Sun's radius. It is radiating 35[5] times the luminosity of the Sun from its photosphere at an effective temperature of 8,216 K.[4] Based on rapid changes in the strength of a singly-ionized calcium absorption line, the star is likely host to a circumstellar disk.[10]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Chesneau2010 was invoked but never defined (see the help page).
  4. ^ a b c d e f g Cite error: The named reference David2015 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Zorec2012 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Kaler was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Montgomery2012 was invoked but never defined (see the help page).