4 Arietis
Star in the constellation Aries
From Wikipedia, the free encyclopedia
4 Arietis is a single[9] star in the northern constellation of Aries, the ram. 4 Arietis is the Flamsteed designation. It is visible to the naked eye as a dim, blue-white hued star with an apparent visual magnitude of 5.86.[2] The star has an annual parallax shift of 11.46±0.15 mas,[1] which is equivalent to a distance of 285 light-years (87 parsecs) from the Sun. It is moving further from the Earth with a heliocentric radial velocity of +6 km/s.[5]
| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Aries |
| Right ascension | 01h 48m 10.92137s[1] |
| Declination | +16° 57′ 19.8483″[1] |
| Apparent magnitude (V) | 5.86[2] |
| Characteristics | |
| Evolutionary stage | main sequence[3] |
| Spectral type | B9.5 V[4] |
| Astrometry | |
| Radial velocity (Rv) | +5.7±1.9[5] km/s |
| Proper motion (μ) | RA: +65.608[1] mas/yr Dec.: −29.291[1] mas/yr |
| Parallax (π) | 11.4613±0.1511 mas[1] |
| Distance | 285 ± 4 ly (87 ± 1 pc) |
| Details | |
| Mass | 2.83[6] or 2.48±0.02[3] M☉ |
| Radius | 2.2[7] R☉ |
| Luminosity | 40.4±1.9[3] L☉ |
| Surface gravity (log g) | 4.47±0.14[6] cgs |
| Temperature | 10,913±371[6] K |
| Rotational velocity (v sin i) | 33[6] km/s |
| Age | 257[6] Myr |
| Other designations | |
| 4 Ari, BD+16°203, FK5 1050, HD 10982, HIP 8387, HR 522, SAO 92637[8] | |
| Database references | |
| SIMBAD | data |
This is a B-type main sequence star with a stellar classification of B9.5 V.[4] It is 257[6] million years old and is spinning with a projected rotational velocity of 33[6] km/s. The star has more than double the mass of the Sun and around 2.2[7] times the Sun's radius. It is radiating 40[3] times the Sun's luminosity from its photosphere at an effective temperature of 10,913 K.[6]