BN Camelopardalis

A visual band light curve for BN Camelopardalis, adapted from Adelman (1997)[1]
Observation data Epoch J2000      Equinox J2000
Constellation	Camelopardalis
Right ascension	05h 12m 22.43769s[2]
Declination	+73° 56′ 48.0382″[2]
Apparent magnitude (V)	5.34 to 5.58[3]
Characteristics
Spectral type	B9.5VpSi[4]
B−V color index	−0.108±0.003[5]
Variable type	α2 CVn[3]
Astrometry
Radial velocity (Rv)	+9.3±2.8[5] km/s
Proper motion (μ)	RA: +6.033[2] mas/yr Dec.: –27.088[2] mas/yr
Parallax (π)	10.5286±0.2275 mas[2]
Distance	310 ± 7 ly (95 ± 2 pc)
Absolute magnitude (MV)	+0.13[5]
Details
Mass	3.05±0.13[6] M☉
Radius	2.9±0.4[7] R☉
Luminosity	110[6] L☉
Surface gravity (log g)	4.15±0.11[7] cgs
Temperature	11,561[6] K
Rotation	2.73332 days[7]
Rotational velocity (v sin i)	23[8] km/s
Other designations
BN Cam, BD+73°274, FK5 2387, HD 32650, HIP 24254, HR 1643, SAO 5455[9]
Database references
SIMBAD	data

BN Camelopardalis is a suspected astrometric binary^[10] in the northern circumpolar constellation of Camelopardalis. It appears as a variable star that is visible to the naked eye as a dim, white-hued point of light with an apparent visual magnitude that fluctuates around 5.5. The system is located at a distance of around 310 light years from the Sun based on parallax,^[2] and is drifting further away with a radial velocity of +9 km/s.^[5]

The visible component is a weakly magnetic^[11] chemically peculiar star^[12][13] with a stellar classification of B9.5VpSi,^[4] matching a B-type main-sequence star with an anomalous abundance of silicon.

John Ernest Winzer announced that the star is a variable star, in 1974.^[14] It was given its variable star designation in 1981.^[15] It ranges in brightness from 5.34 down to 5.58.^[3] Samus et al. (2017) have it categorized as an α² Canum Venaticorum variable with a period of 2.7347 days,^[3] while Adelman and Sutton (2007) found a period of 2.73501 days.^[12] The star has three times the mass and radius of the Sun and is radiating 110 times the Sun's luminosity from its photosphere at an effective temperature of 11,561 K.^[7][6]

References