Astronomy:HR 4180
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Vela |
| Right ascension | 10h 39m 18.39150s[1] |
| Declination | −55° 36′ 11.7624″[1] |
| Apparent magnitude (V) | 4.29[2] |
| Characteristics | |
| Spectral type | G5 IIa[3] + B8 V[4] |
| B−V color index | 1.025±0.003[2] |
| Astrometry | |
| A | |
| Radial velocity (Rv) | +20.1±0.7[5] km/s |
| Proper motion (μ) | RA: −18.412[1] mas/yr Dec.: +4.880[1] mas/yr |
| Parallax (π) | 5.0616 ± 0.2371[1] mas |
| Distance | 640 ± 30 ly (198 ± 9 pc) |
| Absolute magnitude (MV) | −2.76[2] |
| B | |
| Proper motion (μ) | RA: −19.178[1] mas/yr Dec.: +5.524[1] mas/yr |
| Parallax (π) | 4.3859 ± 0.0673[1] mas |
| Distance | 740 ± 10 ly (228 ± 3 pc) |
| Details | |
| Luminosity | 1370.29[6] L☉ |
| Temperature | 5,100[6] K |
| Other designations | |
| A: {{{names1}}} | |
| B: {{{names2}}} | |
| Database references | |
| SIMBAD | HD 92449 |
| HD 92463 | |
HR 4180 is a double star with components HD 92449 and HD 92463 in the southern constellation of Vela. They are probably members of a binary star system.[7] HR 4180 can be viewed with the naked eye, having an apparent visual magnitude of 4.29.[2] Based upon an annual parallax shift of 5.1 mas,[1] it is located 640 light years from the Sun. The system is moving further from the Earth with a heliocentric radial velocity of +20 km/s.[5]
The primary component of this system, HD 92449, is a bright giant with a stellar classification of G5 IIa.[3] The star radiates 1,370 times the Sun's luminosity from its photosphere at an effective temperature of 5,100 K.[6] It shares a common proper motion with the magnitude 6.06[8] star HD 92463,[9] and the pair likely form a binary system.[7] This secondary component is a B-type main-sequence star with a class of B8 V.[4] As of 2000, it had an angular separation of 51.70″ along a position angle of 105° from the primary.[8]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 1.7 1.8 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.
- ↑ 2.0 2.1 2.2 2.3 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode: 2012AstL...38..331A.
- ↑ 3.0 3.1 Keenan, Philip C.; McNeil, Raymond C. (1989). "The Perkins catalog of revised MK types for the cooler stars". Astrophysical Journal Supplement Series 71: 245. doi:10.1086/191373. Bibcode: 1989ApJS...71..245K.
- ↑ 4.0 4.1 Houk, Nancy; Cowley, A. P. (1979). Michigan catalogue of two-dimensional spectral types for the HD stars. 1. Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan. Bibcode: 1978mcts.book.....H.
- ↑ 5.0 5.1 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. doi:10.1051/0004-6361/201219219. A61. Bibcode: 2012A&A...546A..61D.
- ↑ 6.0 6.1 6.2 McDonald, I. et al. (2012), "Fundamental parameters and infrared excesses of Hipparcos stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–357, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ 7.0 7.1 Eggleton, P. P.; Tokovinin, A. A. (2008). "A catalogue of multiplicity among bright stellar systems". Monthly Notices of the Royal Astronomical Society 389 (2): 869. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
- ↑ 8.0 8.1 Mason, B. D.; Wycoff, G. L. I.; Hartkopf, W. I. (2008). "Washington Visual Double Star Catalog, 2006.5 (WDS)". U. S. Naval Observatory, Washington D.C.. http://ad.usno.navy.mil/wds/.
- ↑ Eggen, O. J. (June 15, 1980). "VY Carinae, S Normae, and photometric luminosities for bright giants and supergiants of types G and K". Astrophysical Journal, Part 1 238: 919–928. doi:10.1086/158055. Bibcode: 1980ApJ...238..919E.
 |  |
