| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 04h48m 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) | 90yr |
| 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 |
4 Camelopardalis is a probable multiple star in the northern constellationofCamelopardalis,[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]
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 separationof0.610″ – 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]
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