50 Cassiopeiae

50 Cassiopeiae

50 Cassiopeiae in optical light
Observation data
Epoch J2000      Equinox J2000
Constellation Cassiopeia
Right ascension 02h 03m 26.10206s[1]
Declination +72° 25′ 16.6376″[1]
Apparent magnitude (V) +3.95[2]
Characteristics
Evolutionary stage main sequence[3]
Spectral type A2 V[3]
B−V color index −0.002±0.007[2]
Astrometry
Radial velocity (Rv)−18.2±0.9[4] km/s
Proper motion (μ) RA: −43.57[5] mas/yr
Dec.: +22.30[5] mas/yr
Parallax (π)20.76 ± 0.14 mas[5]
Distance157 ± 1 ly
(48.2 ± 0.3 pc)
Absolute magnitude (MV)0.54[2]
Details
Mass2.56±0.03[3] M☉
Radius2.5[6] R☉
Luminosity63.8+3.5
−6.4[3] L☉
Temperature9,376+240
−235[3] K
Metallicity [Fe/H]+0.18±0.28[7] dex
Rotational velocity (v sin i)91[3] km/s
Other designations
50 Cas, BD+71°117, FK5 70, GC 2445, HD 12216, HIP 9598, HR 580, SAO 4560, NGC 771[8]
Database references
SIMBADdata

50 Cassiopeiae is a white star in the northern constellation of Cassiopeia. In the past, it had been misidentified as a suspected nebula, and given the number NGC 771.[9] The star is visible to the naked eye, having an apparent visual magnitude of +3.95.[2] Based upon an annual parallax shift of 20.76 mas, it is located 157 light years away. It is moving closer, having a heliocentric radial velocity of −18 km/s,[4] and will approach to within 82 ly in 1.879 million years.[2]

A light curve for 50 Cassiopeiae, plotted from TESS data[10]

It is an A-type main-sequence star with a stellar classification of A2 V.[3] It is a suspected variable star with a very small amplitude.[11] 50 Cas has an estimated 2.56 times the mass of the Sun,[3] and about 2.5 times the Sun's radius.[6] It is radiating 64 times the Sun's luminosity from its photosphere at an effective temperature of around 9,376 K.[3]

The star was the brightest star in the occasionally used 1775 to 19th century constellation Custos Messium, typically drawn as a depiction of Charles Messier standing on top of the giraffe (Camelopardus), between Cepheus and Cassiopeia.[12]

  1. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b c d e f g h i Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  5. ^ a b c Cite error: The named reference hipparcos was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference cadars was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Gaspar2016 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference steinicke was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference MAST was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference koen was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference ridpath was invoked but never defined (see the help page).