SW Andromedae

SW Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension 00h 23m 43.08963s[1]
Declination 29° 24′ 03.6265″[1]
Apparent magnitude (V) 9.14 to 10.09[2]
Characteristics
Spectral type A7III[2]
Apparent magnitude (U) 10.287±0.20[3][note 1]
Apparent magnitude (B) 10.097±0.006[3][note 1]
Apparent magnitude (V) 9.692±0.006[3][note 1]
Apparent magnitude (Rc) 9.433±0.020[3][note 1]
Apparent magnitude (Ic) 9.169±0.008[3][note 1]
Apparent magnitude (J) 8.757±0.020[3][note 1]
Apparent magnitude (H) 8.590±0.013[3][note 1]
Apparent magnitude (Ks) 8.511±0.009[3][note 1]
Variable type RRab Lyrae[3]
Astrometry
Proper motion (μ) RA: −6.638(29)[1] mas/yr
Dec.: −18.906(26)[1] mas/yr
Parallax (π)1.77 ± 0.26 mas[1]
Distanceapprox. 1,800 ly
(approx. 560 pc)
Absolute magnitude (MV)0.710[4]
Details[4]
Mass0.26±0.04 M☉
Radius4.51–5.05 R☉
Luminosity39.8±4 L☉
Temperature6644 K
Other designations
SW And, BD+28 54, HIP 1878, TYC 1737-1702-1, 2MASS J00234308+2924036[5]
Database references
SIMBADdata
Phase-folded light curve of the RR Lyrae variable SW Andromedae recorded by NASA's Transiting Exoplanet Survey Satellite (TESS)
Light curve of SW AND taken through a J/C V band filter

SW Andromedae is a variable star in the constellation of Andromeda. It is classified as an RR Lyrae star, and varies from an apparent magnitude of 10.09 at minimum brightness to a magnitude of 9.14 at maximum brightness with a period of 0.44226 days.[2] It exhibits the Blazhko effect, and its period is decreasing.[6][7]

The discovery of this star by Annie Jump Cannon was announced in 1907. 461 photographic plates, spanning the time interval from November 14, 1889 through November 16, 1906 were examined, and an initial period of 0.49932 days was derived.[8] SW Andromedae was given its variable star designation in 1907.[9]

  1. ^ a b c d e Cite error: The named reference Gaia EDR3 was invoked but never defined (see the help page).
  2. ^ a b c Cite error: The named reference gcvs was invoked but never defined (see the help page).
  3. ^ a b c d e f g h i Cite error: The named reference Monson2017 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Barcza2014 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference McNamara was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Skarka was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Fleming was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference VSD was invoked but never defined (see the help page).


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