Mu Arietis
  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Aries[1] |
| Right ascension | 02h 42m 21.936s[2] |
| Declination | +20° 00′ 41.28″[2] |
| Apparent magnitude (V) | 5.74[3] (6.38/8.38/6.72/12.2)[4] |
| Characteristics | |
| Spectral type | A0 Vp + F2 V + A1 V[4] |
| U−B color index | −0.03[5] |
| B−V color index | −0.02[5] |
| Astrometry | |
| Radial velocity (Rv) | −6.0[6] km/s |
| Proper motion (μ) | RA: +29.086 mas/yr[2] Dec.: −46.133 mas/yr[2] |
| Parallax (π) | 7.5702±0.1425 mas[2] |
| Distance | 431 ± 8 ly (132 ± 2 pc) |
| Absolute magnitude (MV) | +0.41[1] |
| Orbit[7] | |
| Period (P) | 8.845±0.046 yr |
| Semi-major axis (a) | 0.0563±0.0008″ |
| Eccentricity (e) | 0.337±0.023 |
| Inclination (i) | 71.2±1.1° |
| Longitude of the node (Ω) | 101.0±1.0° |
| Periastron epoch (T) | B 1981.099±0.063 |
| Argument of periastron (ω) (secondary) | 92.3±1.7° |
| Details | |
| μ Ari Aa | |
| Mass | 3.4±1.7[7] M☉ |
| Luminosity | 71.7[1] L☉ |
| Rotational velocity (v sin i) | 175[8] km/s |
| μ Ari Ab | |
| Mass | 2.1±1.7[7] M☉ |
| Other designations | |
| μ Ari, 34 Arietis, BD+19 403, GC 3256, HD 16811, HIP 12640, HR 793, SAO 93062, PPM 91916, WDS J02424+2001[9] | |
| Database references | |
| SIMBAD | data |
Mu Arietis is a multiple star system in the northern constellation of Aries. Its name is a Bayer designation that is Latinized from μ Arietis, and abbreviated Mu Ari or μ Ari. This system is approximately 431 light-years (132 parsecs) distant from Earth, give or take a 8 light-year margin of error, and has a combined apparent visual magnitude of 5.74.[3] According to the Bortle Dark-Sky Scale, this means it is faintly visible to the naked eye from dark suburban skies. The system is positioned near the ecliptic and is subject to lunar occultation.[7]
At the heart of this system is a close orbiting pair, designated μ Ari Aa, consisting of a magnitude 6.38 A-type main sequence star with a stellar classification of A0 Vp, and a magnitude 8.38 F-type main sequence companion with a classification of F2 V. These two components have an angular separation of 0.04 arcseconds. A third component, designated μ Ari Ab, consists of a magnitude 6.72 star with a classification of A1 V, orbiting the inner pair with a period of 8.845 years and an eccentricity of 0.34.[4] The orbit of this star has been measured using lunar occultations.[7] A smaller fourth component, μ Ari B, at an angular separation of 19.1 arcseconds, has a magnitude of 12.2.[4]
References
[edit]- ^ a b c Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters, 38 (5): 331, arXiv:1108.4971, Bibcode:2012AstL...38..331A, doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
- ^ a b c d Vallenari, A.; et al. (Gaia collaboration) (2023), "Gaia Data Release 3. Summary of the content and survey properties", Astronomy and Astrophysics, 674: A1, arXiv:2208.00211, Bibcode:2023A&A...674A...1G, doi:10.1051/0004-6361/202243940, S2CID 244398875. Gaia DR3 record for this source at VizieR.
- ^ a b Oja, T. (August 1991), "UBV photometry of stars whose positions are accurately known. VI", Astronomy and Astrophysics Supplement Series, 89 (2): 415–419, Bibcode:1991A&AS...89..415O.
- ^ a b c d 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.
- ^ a b Osawa, K.; Hata, S. (1960), "Three colour photometry of B8-A2 stars.", Annals of the Tokyo Astronomical Observatory, 6: 148, Bibcode:1960AnTok...6..148O.
- ^ Palmer, D. R.; et al. (1968), "The radial velocities spectral types and projected rotational velocities of 633 bright northern A stars", Royal Observatory Bulletin, 135: 385, Bibcode:1968RGOB..135..385P.
- ^ a b c d e Mason, Brian D. (1997), "Binary Star Orbits from Speckle Interferometry. XI. Orbits of Twelve Lunar Occultation Systems", The Astronomical Journal, 114: 808, Bibcode:1997AJ....114..808M, doi:10.1086/118514.
- ^ Royer, F.; et al. (February 2007), "Rotational velocities of A-type stars. III. Velocity distributions", Astronomy and Astrophysics, 463 (2): 671–682, arXiv:astro-ph/0610785, Bibcode:2007A&A...463..671R, doi:10.1051/0004-6361:20065224, S2CID 18475298.
- ^ "mu. Ari". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2012-08-07.
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