6 Cassiopeiae

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6 Cassiopeiae
Cassiopeia constellation map.svg
Red circle.svg

Location of 6 Cassiopeiae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 23h 48m 50.171s[1]
Declination +62° 12′ 52.26″[1]
Apparent magnitude (V) +5.43[2]
Spectral type A2.5 Ia+[3]
U−B color index −0.02[2]
B−V color index +0.67[2]
Proper motion (μ) RA: −3.57 ± 0.35[1] mas/yr
Dec.: −1.57 ± 0.33[1] mas/yr
Parallax (π) 0.53 ± 0.37[1] mas
Distance 2,510[4] pc
Absolute magnitude (MV) −8.30[5]
Mass 22.0[5] M
Radius 217[5] R
Luminosity 200,000[6] L
Surface gravity (log g) 1.59[7] cgs
Temperature 10,023 ± 227[7] K
Rotational velocity (v sin i) 50[5] km/s
Other designations
HR 9018, HD 223385, BD+61°2533, HIP 117447, SAO 20869
Database references

6 Cassiopeiae (6 Cas) is a white A2.5 type hypergiant. It is about 25 times as massive as the Sun and 200,000 times as luminous. It is classified as a member of the Cassiopeiae OB5 stellar association at a distance of around 8,000 light-years.


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  2. ^ a b c Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237: 0. Bibcode:2002yCat.2237....0D. 
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  4. ^ Mel'Nik, A. M.; Efremov, Yu. N. (1995). "A new list of OB associations in our galaxy". Astronomy Letters 21: 10. Bibcode:1995AstL...21...10M. 
  5. ^ a b c d Verdugo, Eva; Talavera, Antonio; Gómez De Castro, Ana I.; Henrichs, Huib F. (2003). "Search for magnetic fields in A-type supergiants". A Massive Star Odyssey: from Main Sequence to Supernova 212: 255. Bibcode:2003IAUS..212..255V. 
  6. ^ Achmad, L.; Lamers, H. J. G. L. M.; Pasquini, L. (1997). "Radiation driven wind models for A, F and G supergiants". Astronomy and Astrophysics 320: 196. Bibcode:1997A&A...320..196A. 
  7. ^ a b Prugniel, P.; Vauglin, I.; Koleva, M. (2011). "The atmospheric parameters and spectral interpolator for the MILES stars". Astronomy & Astrophysics 531: A165. arXiv:1104.4952. Bibcode:2011A&A...531A.165P. doi:10.1051/0004-6361/201116769.