  | |
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Musca |
| Right ascension | 13h 02m 16.26474s[1] |
| Declination | −71° 32′ 55.8752″[1] |
| Apparent magnitude (V) | +3.61[2] |
| Characteristics | |
| Spectral type | K2III[3] |
| U−B color index | +1.26[2] |
| B−V color index | +1.18[2] |
| Astrometry | |
| Radial velocity (Rv) | 36.5±0.9[4] km/s |
| Proper motion (μ) | RA: 264.17[1] mas/yr Dec.: −22.75[1] mas/yr |
| Parallax (π) | 35.88 ± 0.44 mas[1] |
| Distance | 91 ± 1 ly (27.9 ± 0.3 pc) |
| Absolute magnitude (MV) | +1.38[5] |
| Orbit[6] | |
| Period (P) | 422.0266±5.3908 d |
| Semi-major axis (a) | 11.67±1.02 mas |
| Eccentricity (e) | 0.4918±0.1241 |
| Inclination (i) | 120.07±6.02° |
| Longitude of the node (Ω) | 59.27±5.29° |
| Periastron epoch (T) | 2,447,947.6680±27.5934 JD |
| Argument of periastron (ω) (secondary) | 316.39±26.13° |
| Details | |
| Luminosity | 42[5] L☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
Delta Muscae, Latinized from δ Muscae, often catalogued as HD 112985, is a spectroscopic binary star system and the closest to the Earth in the southern hemisphere constellation of Musca (the Fly) at a distance of approximately 27.8 parsecs (91.0 light years). The main star is classified as a giant star with an orange tint. It is one of the stars given a Bayer designation by astronomer Johann Bayer. It was recorded in Bayer's 1603 publication Uranometria. In addition it is one of the main stars used in the visual formation of the Musca constellation.
- ^ a b c d e van Leeuwen, F.; et al. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. S2CID 18759600.
- ^ a b c Cousins, A. W. J.; Stoy, R. H. (1962). "Photoelectric magnitudes and colours of Southern stars". Royal Observatory Bulletin. 64 (64). SIMBAD: 103. Bibcode:1962RGOB...64..103C.
- ^ Gray, R. O.; Corbally, C. J.; Garrison, R. F.; McFadden, M. T.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2006). "Contributions to the Nearby Stars (NStars) Project: Spectroscopy of Stars Earlier than M0 within 40 pc--The Southern Sample". The Astronomical Journal. 132 (1): 161–170. arXiv:astro-ph/0603770. Bibcode:2006AJ....132..161G. doi:10.1086/504637. S2CID 119476992.
- ^ Evans, D. S. (2006). "The Revision of the General Catalogue of Radial Velocities". Determination of Radial Velocities and Their Applications. 30: 57. Bibcode:1967IAUS...30...57E.
- ^ a b 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, S2CID 119257644.
- ^ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Archived from the original on 1 August 2017. Retrieved 24 March 2017.