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]
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 | |
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]