9 Cassiopeiae

9 Cassiopeiae
Location of 9 Cassiopeiae (circled)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Cassiopeia
Right ascension 00h 04m 13.6625s[1]
Declination +62° 17′ 15.591″[1]
Apparent magnitude (V) +5.884[2]
Characteristics
Spectral type A1II-III[3]
U−B color index +0.29[4]
B−V color index +0.30[4]
Astrometry
Radial velocity (Rv)−23.43±0.16[1] km/s
Proper motion (μ) RA: −0.936[1] mas/yr
Dec.: −0.263[1] mas/yr
Parallax (π)1.3781 ± 0.0237 mas[1]
Distance2,370 ± 40 ly
(730 ± 10 pc)
Details
Mass5.1[5] M☉
Radius26[6] R☉
Luminosity2,208[6] L☉
Surface gravity (log g)2.08[5] cgs
Temperature7,719[6] K
Metallicity [Fe/H]−0.32[5] dex
Rotational velocity (v sin i)33[7] km/s
Age25.1[8] Myr
Other designations
9 Cas, HR 9100, HD 225180, BD+61°2586, HIP 330
Database references
SIMBADdata

9 Cassiopeiae (9 Cas) is a white giant star in the constellation Cassiopeia, about 2,370 light years away.

9 Cassiopeiae is classified as an A1 type giant or bright giant. One study noted peculiarities in the spectrum that could indicate a λ Boötis star,[9] but other researchers have refuted this.[10][7]

At an age of 25 million years, 9 Cassiopeiae has expanded away from the main sequence after exhausting its core hydrogen and now has a radius about 26 times that of the Sun. With an effective temperature of about 7,700 K, it emits more than two thousand times the luminosity of the Sun.

9 Cassiopeiae has a number of faint companions listed in multiple star catalogues,[11] but they all appear to be at different distances[12] and none are thought to be gravitationally associated.[13]

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  7. ^ a b Cite error: The named reference murphy2015 was invoked but never defined (see the help page).
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  13. ^ Cite error: The named reference eggelton2008 was invoked but never defined (see the help page).