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ST Andromedae

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ST Andromedae
ST Andromedae.jpg
ST Andromedae in optical light
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Andromeda
Right ascension  23h 38m 45.1329s[1]
Declination 35° 46′ 21.2432″[1]
Apparent magnitude (V) 7.7 to 11.8[2]
Spectral type C4,3e-C6,4e[2]
Variable type SRa[2]
Proper motion (μ) RA: −0.271±0.060 [1] mas/yr
Dec.: −2.573±0.046 [1] mas/yr
Parallax (π)0.5371 ± 0.0488[1] mas
Distance6,100 ± 600 ly
(1,900 ± 200 pc)
Luminosity2,660[3] L
Temperature2,825[3] K
Other designations
ST Andromedae, ST And, HD 222241, HIP 116681, BD+34 4974
Database references

ST Andromedae is a variable star in the constellation of Andromeda. It is classified as a semiregular variable pulsating giant star of specific type SRA, and varies from an apparent visual magnitude of 11.8 at minimum brightness to a magnitude of 7.7 at maximum brightness, with a period of approximately 326.6 days.[2]

Observational history[edit]

The variable nature of ST Andromedae was discovered by Williamina Fleming, in 1906, by examining photographic plates taken for the purpose of creating the Henry Draper Catalogue.[4]


  1. 1.0 1.1 1.2 1.3 1.4 Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. 2.0 2.1 2.2 2.3 ST 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 2009-06-30.
  3. 3.0 3.1 Bogdanov, M. B.; Taranova, O. G. (2012). "IR photometry and dust-shell models for two carbon stars". Astronomy Reports. 56 (2): 124. Bibcode:2012ARep...56..124B. doi:10.1134/S1063772912020011.
  4. Pickering, E. C.; Fleming, W. P. (1906). "Stars having peculiar spectra. Thirteen new variable stars". Astrophysical Journal. 23: 257–261. Bibcode:1906ApJ....23..257P. doi:10.1086/141337.

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