V669 Cassiopeiae

V669 Cassiopeiae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 01h 33m 51.21s[1]
Declination 62° 26′ 53.2″[1]
Apparent magnitude (V) 17.48[2]
Characteristics
Evolutionary stage AGB[3]
Spectral type M9III[3]
Apparent magnitude (J) 16.747[1]
Apparent magnitude (H) 11.232[1]
Apparent magnitude (K) 7.097[1]
Variable type Mira?[4]
Astrometry
Proper motion (μ) RA: −2.813[5] mas/yr
Dec.: −2.147[5] mas/yr
Parallax (π)1.9523 ± 0.7049 mas[5]
Distance2,100[6] pc
Details
Radius370 – 702[6] R☉
Luminosity10,000 - 36,000[6] L☉
Temperature3,000[6] K
Database references
SIMBADdata

V669 Cassiopeiae or V669 Cas is an OH/IR star, a type of particularly cool red giant, with a spectral type of M9III.

With a mean visual apparent magnitude 17.5, V669 Cassiopeiae varies with an amplitude of about half a magnitude.[2] In the mid-infrared L band, its magnitude range is 1.57 to 3.02. It is listed as a possible Mira variable, but with the extremely long period of 1,994 days.[4]

Jan Herman and Harm Jan Habing reported in 1985 that the star's OH maser emission varied in intensity with a 1994 day period.[7] In 1990, Paolo Persi et al. showed that V669 Cassiopeiae varied in infrared brightness,[8] and for that reason it was given its variable star designation in 1993.[9]

The distance and physical properties of V669 Cassiopeiae are highly uncertain. Based on parallax, it is about 1,600 light years away, but a distance of about 20,000 light years has been derived based on observations of masers around the star.[3] Based on a luminosity derived from its pulsations and spectral energy distribution, it would be at a distance of 6,850 light years.[6]

  1. ^ a b c d e Cite error: The named reference 2mass was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference asassn was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference debeck2010 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference gcvs was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference dr2 was invoked but never defined (see the help page).
  6. ^ a b c d e Cite error: The named reference lombaert2013 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference HnH was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Persi was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Kazarovets was invoked but never defined (see the help page).