Astronomy:HD 64440
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Short description: Star in the constellation Puppis
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| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Puppis |
| Right ascension | 07h 52m 13.03173s[1] |
| Declination | −40° 34′ 32.8318″[1] |
| Apparent magnitude (V) | 3.71[2] (4.2 + 5.0)[3] |
| Characteristics | |
| Spectral type | K1II+A0.5[4] |
| U−B color index | +0.75[5] |
| B−V color index | +1.05[5] |
| Astrometry | |
| Radial velocity (Rv) | +24.00[6] km/s |
| Proper motion (μ) | RA: -18.00[1] mas/yr Dec.: +5.01[1] mas/yr |
| Parallax (π) | 8.46 ± 0.40[7] mas |
| Distance | 390 ± 20 ly (118 ± 6 pc) |
| Absolute magnitude (MV) | -1.44[2] |
| Orbit[7] | |
| Period (P) | 6.13+0.031 −0.033 yr |
| Semi-major axis (a) | 0.058+0.001 −0.003″ |
| Eccentricity (e) | 0.667+0.017 −0.018 |
| Inclination (i) | 79.683+2.798 −4.02° |
| Longitude of the node (Ω) | 95.118+2.565 −2.183° |
| Periastron epoch (T) | 1981.442+0.074 −0.084 |
| Argument of periastron (ω) (secondary) | 157.473+5.584 −3.427° |
| Details | |
| A | |
| Mass | 6.058+0.15 −0.125[7] M☉ |
| Radius | 30.75±1.64[8] R☉ |
| Luminosity | 405±35[8] L☉ |
| Surface gravity (log g) | 2.078±0.178[8] cgs |
| Temperature | 4,670±72[8] K |
| Metallicity [Fe/H] | −0.048±0.052[8] dex |
| Rotational velocity (v sin i) | 2.3[9] km/s |
| B | |
| Mass | 2.381+0.375 −0.334[7] M☉ |
| Other designations | |
| Database references | |
| SIMBAD | data |
HD 64440, also known as a Puppis, is a binary star in the constellation Puppis. At a moderate brightness of 3.71, it is visible to the naked eye.[2] Parallax measurements give a distance of 108 parsecs (350 light-years).[1]
This is a spectroscopic binary of the single-lined type, meaning the spectral lines of only a component can be seen in the spectrum.[7] The primary has a spectral type of K1.5II,[4] which at first would make it a bright giant star, but this classification is unsupported by its relatively small absolute magnitude.[7] The secondary is an early A-type star.[4] They orbit with a period of about 6.13 years and have a high eccentricity of 0.667.[7]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. doi:10.1051/0004-6361:20078357. Bibcode: 2007A&A...474..653V. Vizier catalog entry
- ↑ 2.0 2.1 2.2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. Vizier catalog entry
- ↑ "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. http://www.astro.gsu.edu/wds/orb6.html. Retrieved 2025-02-08.
- ↑ 4.0 4.1 4.2 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. doi:10.1111/j.1365-2966.2008.13596.x. Bibcode: 2008MNRAS.389..869E.
- ↑ 5.0 5.1 Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers 42 (2): 443. Bibcode: 2014JAVSO..42..443M.Vizier catalog entry
- ↑ Wilson, R. E. (1953). "General Catalogue of Stellar Radial Velocities". Carnegie Institute Washington D.C. Publication (Carnegie Institution for Science). Bibcode: 1953GCRV..C......0W.
- ↑ 7.0 7.1 7.2 7.3 7.4 7.5 7.6 Anguita-Aguero, Jennifer; Mendez, Rene A.; Videla, Miguel; Costa, Edgardo; Vanzi, Leonardo; Castro-Morales, Nicolas; Caballero-Valdes, Camila (September 2023). "Mass Ratio of Single-line Spectroscopic Binaries with Visual Orbits Using Bayesian Inference and Suitable Priors" (in en). The Astronomical Journal 166 (4): 172. doi:10.3847/1538-3881/acf297. ISSN 1538-3881. Bibcode: 2023AJ....166..172A.
- ↑ 8.0 8.1 8.2 8.3 8.4 Ottoni, G.; Udry, S.; Ségransan, D.; Buldgen, G.; Lovis, C.; Eggenberger, P.; Pezzotti, C.; Adibekyan, V. et al. (2022-01-01). "CORALIE radial-velocity search for companions around evolved stars (CASCADES). I. Sample definition and first results: Three new planets orbiting giant stars". Astronomy and Astrophysics 657: A87. doi:10.1051/0004-6361/202040078. ISSN 0004-6361. Bibcode: 2022A&A...657A..87O. a Puppis' database entry at VizieR.
- ↑ De Medeiros, J. R.; Alves, S.; Udry, S.; Andersen, J.; Nordström, B.; Mayor, M. (2014). "A catalog of rotational and radial velocities for evolved stars". Astronomy & Astrophysics 561: A126. doi:10.1051/0004-6361/201220762. Bibcode: 2014A&A...561A.126D. Vizier catalog entry
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