4 Camelopardalis

4 Camelopardalis is a probable multiple star in the northern constellation of Camelopardalis,^[11] located 177 light years away from the Sun, based upon parallax.^[1] With a combined apparent visual magnitude of 5.29,^[2] it is visible to the naked eye as a faint, white-hued star. The pair have a relatively high proper motion, traversing the celestial sphere at an angular rate of 0.158″ per year.^[12] The system's proper motion makes it a candidate for membership in the IC 2391 supercluster.^[13] They are moving away from the Earth with a heliocentric radial velocity of 22.5 km/s.^[5]

4 Camelopardalis

Observation data Epoch J2000      Equinox J2000
Constellation	Camelopardalis
Right ascension	04h 48m 00.2729s[1]
Declination	+56° 45′ 25.837″[1]
Apparent magnitude (V)	5.29[2]
Characteristics
Spectral type	A3m[3]
U−B color index	0.12[4]
B−V color index	0.246±0.003[2]
Astrometry
Radial velocity (Rv)	+22.50±0.9[5] km/s
Proper motion (μ)	RA: +52.892[1] mas/yr Dec.: −140.618[1] mas/yr
Parallax (π)	18.4464±0.1109 mas[1]
Distance	177 ± 1 ly (54.2 ± 0.3 pc)
Absolute magnitude (MV)	1.68[2]
Orbit[6]
Primary	Aa
Companion	Ab
Period (P)	90 yr
Semi-major axis (a)	0.503″
Eccentricity (e)	0.87
Inclination (i)	120.0°
Longitude of the node (Ω)	54.5°
Argument of periastron (ω) (secondary)	235.9°
Details
Mass	2.01[7] M☉
Radius	2.57+0.05 −0.17[8] R☉
Luminosity	17.64[2] L☉
Surface gravity (log g)	3.98[9] cgs
Temperature	7,700[9] K
Metallicity [Fe/H]	+0.27[9] dex
Rotational velocity (v sin i)	75[10] km/s
Age	560[7] Myr
Other designations
4 Cam, BD+56°973, FK5 175, HD 30121, HIP 22287, HR 1511, SAO 24829[11]
Database references
SIMBAD	data

The brighter member, designated component A, is classified as an Am star, which indicates that the spectrum shows abnormalities of certain elements.^[14] It is an estimated 560^[7] million years old and is spinning with a projected rotational velocity of 75^[10] The star has 2.01^[7] times the mass of the Sun and 2.57^[8] times the Sun's radius. It is radiating 18^[2] times the Sun's luminosity from its photosphere at an effective temperature of 7,700 K.^[9]

There is a faint, magnitude 9.49 companion at an angular separation of 0.610″ – component B; the pair most likely form a binary systemwith a period of about 90 years.^[6] There is also a 13th-magnitude visual companion 13″ away which shares a common proper motion and parallax.^[15][6] Another listed companion, a 12th-magnitude star nearly 2′ away, is probably unrelated.^[16]