54 Cassiopeiae

54 Cassiopeiae is a star in the northern constellation Cassiopeia. Located 88 ly (27 pc) from Earth,^[2] it has an apparent magnitude of 6.59,^[3] which makes it hard to be seen by the naked eye even from dark skies. Its absolute magnitude is 4.4.^[5] It is a F-type main-sequence star with a stellar classification F8V, currently fusing atoms of hydrogen into helium at its core.^[4]

54 Cassiopeiae

Observation data Epoch J2000      Equinox J2000
Constellation	Cassiopeia[1]
Right ascension	02h 09m 80.26080s[2]
Declination	+71° 33′ 07.2268″[2]
Apparent magnitude (V)	+6.587[3]
Characteristics
Evolutionary stage	Main sequence
Spectral type	F8V[4]
Astrometry
Radial velocity (Rv)	0.58±0.12[2] km/s
Proper motion (μ)	RA: +306.91 mas/yr[2] Dec.: −239.244 mas/yr[2]
Parallax (π)	37.0117±0.0173 mas[2]
Distance	88.12 ± 0.04 ly (27.02 ± 0.01 pc)
Absolute magnitude (MV)	+4.42[5]
Details
Mass	1.09+0.06 −0.31[6] M☉
Radius	1.061[7] R☉
Luminosity	1.411[7] L☉
Surface gravity (log g)	4.0[8] cgs
Temperature	6,039[5] K
Metallicity [Fe/H]	+0.25[5] dex
Rotational velocity (v sin i)	6[8] km/s
Age	2.5[5] Gyr
Other designations
54 Cas, BD+70 163, HD 12800, HIP 10031, G 244-50
Database references
SIMBAD	data

Astrometric measurements by the Gaia spacecraft suggested the presence of a planetary companion to 54 Cassiopeiae, seven times more massive than Jupiter and with an orbital period of 401 days (1.10 years).^[9][6] This was later rejected by the Gaia team as a false positive caused by a software error.^[10] Radial velocity observations also show no evidence for this planet.^[11]