5 Camelopardalis

5 Camelopardalis is a binary star^[11] system in the northern circumpolar constellation of Camelopardalis, located about 770 light years away from the Sun as determined using parallax.^[1] With an apparent magnitude of 5.5,^[2] it can be seen with the naked eye as a faint, blue-white hued star. The system is moving further from the Earth with a heliocentric radial velocity of +2.4 km/s.^[5]

5 Camelopardalis

Observation data Epoch J2000      Equinox J2000
Constellation	Camelopardalis
Right ascension	04h 55m 03.13350s[1]
Declination	+55° 15′ 32.8530″[1]
Apparent magnitude (V)	5.522[2]
Characteristics
Spectral type	B9.5 V[3] or B9.5 IV[4]
U−B color index	+0.001[2]
B−V color index	+0.038[2]
Astrometry
Radial velocity (Rv)	+2.4[5] km/s
Proper motion (μ)	RA: −15.304[1] mas/yr Dec.: −11.501[1] mas/yr
Parallax (π)	4.2348±0.0951 mas[1]
Distance	770 ± 20 ly (236 ± 5 pc)
Absolute magnitude (MV)	−0.84[6]
Details
Mass	2.15[7] M☉
Radius	5.1[7] R☉
Luminosity	226[7] L☉
Surface gravity (log g)	3.36[7] cgs
Temperature	9,931[7] K
Rotational velocity (v sin i)	102[8] km/s
Age	277[9] Myr
Other designations
5 Cam, BD+55°941, FK5 2367, HD 30958, HIP 22854, HR 1555, SAO 24904, WDS J04551+5516A[10]
Database references
SIMBAD	data

The primary component is a B-type main sequence star with a stellar classification of B9.5 V.^[3] However, Abt and Morrell (1995) found a luminosity class of IV,^[4] suggesting it is instead a subgiant star that is evolving off the main sequence. It has a high rate of spin with a projected rotational velocity of 102 km/s and has 2.15 times the mass of the Sun. The star is radiating 226 times the luminosity of the Sun from its photosphere at an effective temperature of 9,931 K.^[7]

The magnitude 12.9 common proper motion companion lies at an angular separation of 12.9″.^[11] It appears to be slightly smaller and cooler than the Sun.^[12]