SW Andromedae

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]

SW Andromedae
Observation data
Epoch J2000      Equinox J2000
Constellation Andromeda
Right ascension  00h 23m 43.0896s[1]
Declination 29° 24′ 03.626″[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: −6.571±0.110[1] mas/yr
Dec.: −18.803±0.081[1] mas/yr
Parallax (π)1.77 ± 0.26[1] mas
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

Notes
  1. Since SW Andromedae is a variable star these magnitudes are means sampled over the light curve.
gollark: This is Haskell. I am assigning to variables.
gollark: Ah.
gollark: Good idea. Maybe somewhere cheaper.
gollark: Have you tried not living there?
gollark: ```haskelldoThing :: Expr -> (M.Map Int IVal, Int)doThing expr = evalState (go expr) 0 where go :: Expr -> State Int (M.Map Int IVal, Int) go (Int x) = do vcount <- update (+1) pure (M.singleton vcount (Lit x), vcount) go (Op o a b) = do (m1, c1) <- go a (m2, c2) <- go b let prev = M.union m1 m2 nxt <- update (+1) pure (M.insert nxt (ROp o c1 c2) prev, nxt)```NONE are safe from my Haskell code.

References
  1. Brown, A. G. A.; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512.Gaia Data Release 1 catalog entry
  2. SW And, database entry, Combined General Catalog of Variable Stars (GCVS4.2, 2004 Ed.), N. N. Samus, O. V. Durlevich, et al., CDS ID II/250 Accessed on line 2014-07-02.
  3. Monson, Andrew J.; et al. (2017). "Standard Galactic Field RR Lyrae. I. Optical to Mid-infrared Phased Photometry". The Astronomical Journal. 153 (3). 96. arXiv:1703.01520. Bibcode:2017AJ....153...96M. doi:10.3847/1538-3881/153/3/96.
  4. Barcza, S.; Benkő, J. M. (2014). "Fundamental parameters of RR Lyrae stars from multicolour photometry and Kurucz atmospheric models – III. SW And, DH Peg, CU Com and DY Peg". Monthly Notices of the Royal Astronomical Society. 442 (2): 1863–1876. arXiv:1405.4184. Bibcode:2014MNRAS.442.1863B. doi:10.1093/mnras/stu978.
  5. "V* SW And". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-04-21.


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