Beta Cassiopeiae

Caph, Beta Cassiopeiae
Location of β Cassiopeiae (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Cassiopeia
Right ascension 00h 09m 10.68518s[1]
Declination +59° 08′ 59.2120″[1]
Apparent magnitude (V) +2.28 (2.25–2.31)[2]
Characteristics
Spectral type F2 III[3]
U−B color index 0.11[4]
B−V color index 0.34[4]
Variable type δ Sct[5]
Astrometry
Radial velocity (Rv)11.3[6] km/s
Proper motion (μ) RA: +523.50[1] mas/yr
Dec.: −179.77[1] mas/yr
Parallax (π)59.58 ± 0.38 mas[1]
Distance54.7 ± 0.3 ly
(16.8 ± 0.1 pc)
Absolute magnitude (MV)+1.3[7]
Details
Mass1.91 ± 0.02[8] M☉
Radius3.43–3.69[8] R☉
Luminosity27.3[8] L☉
Surface gravity (log g)3.40[5] cgs
Temperature7,079[5] K
Metallicity [Fe/H]0.03[8] dex
Rotational velocity (v sin i)71.0[9] km/s
Age1.09–1.18[8] Gyr
Other designations
Caph, Chaph, Kaff, Al Sanam al Nakah,[10] 11 Cas, Gl 8, HR 21, BD+58°3, HD 432, LHS 1027, GCTP 16.00, SAO 21133, FK5 2, HIP 746, GC 147, ADS 107, CCDM J00092+5909[11]
Database references
SIMBADdata

Beta Cassiopeiae (β Cassiopeiae, abbreviated Beta Cas or β Cas), officially named Caph /ˈkæf/,[12][13] is a Delta Scuti variable star in the constellation of Cassiopeia. It is a giant star belonging to the spectral class F2. The white star of second magnitude (+2.28 mag, variable) has an absolute magnitude of +1.3 mag.

  1. ^ a b c d e Cite error: The named reference aaa474_2_653 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  3. ^ Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Robinson, P. E. (2003). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 Parsecs: The Northern Sample. I". The Astronomical Journal. 126 (4): 2048. arXiv:astro-ph/0308182. Bibcode:2003AJ....126.2048G. doi:10.1086/378365. S2CID 119417105.
  4. ^ a b Cite error: The named reference clpl4 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference asr31_2 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference rgcrv was invoked but never defined (see the help page).
  7. ^ Jaschek, C.; Gomez, A. E. (1998). "The absolute magnitude of the early type MK standards from HIPPARCOS parallaxes". Astronomy and Astrophysics. 330: 619. Bibcode:1998A&A...330..619J.
  8. ^ a b c d e Cite error: The named reference apj732_2 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference aaa493_3_1099 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference allen was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Kunitzsch, Paul; Smart, Tim (2006). A Dictionary of Modern star Names: A Short Guide to 254 Star Names and Their Derivations (2nd rev. ed.). Cambridge, Massachusetts: Sky Pub. ISBN 978-1-931559-44-7.
  13. ^ "IAU Catalog of Star Names". Retrieved 9 August 2023.