| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
| Constellation | Aries |
| Right ascension | 01 48 10.92137 |
| Declination | +16° 57′ 19.8483″ |
| Apparent magnitude (V) | 5.86 |
| Characteristics | |
| Evolutionary stage | main sequence |
| Spectral type | B9.5 V |
| Astrometry | |
| Radial velocity (Rv) | +5.7±1.9 km/s |
| Proper motion (μ) | RA: +65.608 mas/yr Dec.: −29.291 mas/yr |
| Parallax (π) | 11.4613 ± 0.1511 mas |
| Distance | 285 ± 4 ly (87 ± 1 pc) |
| Details | |
| Mass | 2.83 or 2.48±0.02 M☉ |
| Radius | 2.2 R☉ |
| Luminosity | 40.4±1.9 L☉ |
| Surface gravity (log g) | 4.47±0.14 cgs |
| Temperature | 10,913±371 K |
| Rotational velocity (v sin i) | 33 km/s |
| Age | 257 Myr |
| Other designations | |
| 4 Ari, BD+16°203, FK5 1050, HD 10982, HIP 8387, HR 522, SAO 92637 | |
| Database references | |
| SIMBAD | data |
4 Arietis is a single 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. The star has an annual parallax shift of 11.46±0.15 mas, 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.
This is a B-type main sequence star with a stellar classification of B9.5 V. It is 257 million years old and is spinning with a projected rotational velocity of 33 km/s. The star has more than double the mass of the Sun and around 2.2 times the Sun's radius. It is radiating 40 times the Sun's luminosity from its photosphere at an effective temperature of 10,913 K.
References
- ^ Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
- ^ Oja, T. (April 1983), "UBV photometry of FK4 and FK4 supplement stars", Astronomy and Astrophysics Supplement Series, 52: 131–134, Bibcode:1983A&AS...52..131O.
- ^ Zorec, J.; Royer, F.; Asplund, Martin; Cassisi, Santi; Ramirez, Ivan; Melendez, Jorge; Bensby, Thomas; Feltzing, Sofia (2012), "Rotational velocities of A-type stars. IV. Evolution of rotational velocities", Astronomy and Astrophysics, 537: A120, arXiv:1201.2052, Bibcode:2012A&A...537A.120Z, doi:10.1051/0004-6361/201117691, S2CID 55586789.
- ^ Cowley, A.; et al. (April 1969), "A study of the bright A stars. I. A catalogue of spectral classifications", Astronomical Journal, 74: 375–406, Bibcode:1969AJ.....74..375C, doi:10.1086/110819.
- ^ de Bruijne, J. H. J.; Eilers, A.-C. (October 2012), "Radial velocities for the HIPPARCOS-Gaia Hundred-Thousand-Proper-Motion project", Astronomy & Astrophysics, 546: 14, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, S2CID 59451347, A61.
- ^ David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal, 804 (2): 146, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
- ^ Pasinetti Fracassini, L. E.; et al. (February 2001), "Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS)", Astronomy and Astrophysics, 367 (2) (Third ed.): 521–524, arXiv:astro-ph/0012289, Bibcode:2001A&A...367..521P, doi:10.1051/0004-6361:20000451, S2CID 425754.
- "4 Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 14 April 2019.
- Eggleton, P. P.; Tokovinin, A. A. (September 2008), "A catalogue of multiplicity among bright stellar systems", Monthly Notices of the Royal Astronomical Society, 389 (2): 869–879, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x, S2CID 14878976.
External links
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