49 Cassiopeiae

49 Cassiopeiae
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
49 Cas A
Right ascension 02h 05m 31.55013s[1]
Declination +76° 06′ 54.2164″[1]
Apparent magnitude (V) 5.32[2]
49 Cas B
Right ascension 02h 05m 30.09074s[3]
Declination +76° 06′ 51.9730″[3]
Apparent magnitude (V) 12.30[2]
Characteristics
49 Cas A
Evolutionary stage horizontal branch[4]
Spectral type G8III[5]
B−V color index 0.954±0.003[6]
Astrometry
49 Cas A
Radial velocity (Rv)−0.20±0.30[6] km/s
Proper motion (μ) RA: −11.813[1] mas/yr
Dec.: −20.561[1] mas/yr
Parallax (π)7.6673 ± 0.0700 mas[1]
Distance425 ± 4 ly
(130 ± 1 pc)
Absolute magnitude (MV)−0.44[7]
49 Cas B
Proper motion (μ) RA: −13.572[3] mas/yr
Dec.: −19.339[3] mas/yr
Parallax (π)7.9161 ± 0.0228 mas[3]
Distance412 ± 1 ly
(126.3 ± 0.4 pc)
Details
49 Cas A
Mass2.6[8] M☉
Radius16.6[1] R☉
Luminosity140[1] L☉
Surface gravity (log g)2.66[8] cgs
Temperature5,087[9] K
Metallicity [Fe/H]−0.04[9] dex
Rotational velocity (v sin i)1.2[10] km/s
Age647[9] Myr
49 Cas B
Mass0.81[3] M☉
Radius0.76[3] R☉
Luminosity0.28[3] L☉
Surface gravity (log g)4.59[3] cgs
Temperature4,886[3] K
Age1.6[3] Gyr
Other designations
49 Cas, BD+75°86, GC 2475, HD 12339, HIP 9763, HR 592, SAO 4565, CCDM J02056+7607, GSC 04495-01881[11]
Database references
SIMBADdata

49 Cassiopeiae is a binary star[12] system in the northern circumpolar constellation of Cassiopeia. It is visible to the naked eye as a faint, yellow-hued point of light with an apparent visual magnitude of 5.22.[6] The system is located about 412 light years away from the Sun, based on parallax. The pair had an angular separation of 5.40″ along a position angle of 244°, as of 2008, with the brighter component being of magnitude 5.32 and its faint companion having magnitude 12.30.[2]

The primary, designated component A,[2] is an aging giant star with a stellar classification of G8III.[5] It is 302 million years old with 3.3 times the mass of the Sun.[7] With the supply of hydrogen at its core exhausted, the star has now expanded to 17 times the Sun's radius. It is a red clump giant on the horizontal branch, which indicates it is generating energy through the fusion of helium at its core.[4] The star is radiating 140 times the luminosity of the Sun from its swollen photosphere at an effective temperature of 5,087 K. Its faint secondary companion, component B, is of an unknown spectral type. It has a temperature similar to the primary, but a luminosity much lower than the Sun's.

  1. ^ a b c d e f g Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference WDSC2014 was invoked but never defined (see the help page).
  3. ^ a b c d e f g h i j k Cite error: The named reference GaiaDR3b was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Alves2000 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Abt2008 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Takeda2008 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference starhorse was invoked but never defined (see the help page).
  9. ^ a b c Cite error: The named reference ting2019 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference glebocki2005 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. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).