4 Camelopardalis
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Camelopardalis |
| Right ascension | 04h 48m 00.2729s |
| Declination | +56° 45′ 25.837″ |
| Apparent magnitude (V) | 5.29 |
| Characteristics | |
| Spectral type | A3m |
| U−B color index | 0.12 |
| B−V color index | 0.246±0.003 |
| Astrometry | |
| Radial velocity (Rv) | +22.50±0.9 km/s |
| Proper motion (μ) | RA: +52.892 mas/yr Dec.: −140.618 mas/yr |
| Parallax (π) | 18.4464±0.1109 mas |
| Distance | 177 ± 1 ly (54.2 ± 0.3 pc) |
| Absolute magnitude (MV) | 1.68 |
| Orbit | |
| 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 M☉ |
| Radius | 2.57+0.05 −0.17 R☉ |
| Luminosity | 17.64 L☉ |
| Surface gravity (log g) | 3.98 cgs |
| Temperature | 7,700 K |
| Metallicity [Fe/H] | +0.27 dex |
| Rotational velocity (v sin i) | 75 km/s |
| Age | 560 Myr |
| Other designations | |
| 4 Cam, BD+56°973, FK5 175, HD 30121, HIP 22287, HR 1511, SAO 24829 | |
| Database references | |
| SIMBAD | data |
4 Camelopardalis is a probable multiple star in the northern constellation of Camelopardalis, located 177 light years away from the Sun, based upon parallax. With a combined apparent visual magnitude of 5.29, 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. The system's proper motion makes it a candidate for membership in the IC 2391 supercluster. They are moving away from the Earth with a heliocentric radial velocity of 22.5 km/s.
The brighter member, designated component A, is classified as an Am star, which indicates that the spectrum shows abnormalities of certain elements. It is an estimated 560 million years old and is spinning with a projected rotational velocity of 75 The star has 2.01 times the mass of the Sun and 2.57 times the Sun's radius. It is radiating 18 times the Sun's luminosity from its photosphere at an effective temperature of 7,700 K.
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. There is also a 13th-magnitude visual companion 13″ away which shares a common proper motion and parallax. Another listed companion, a 12th-magnitude star nearly 2′ away, is probably unrelated.