HD 120987
HD 120987
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| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
Constellation | Centaurus |
Right ascension | 13h 53m 32.76039s[1] |
Declination | −35° 39′ 51.3200″[1] |
Apparent magnitude (V) | 5.565[2] (6.27 / 6.38)[3] |
| Characteristics | |
Spectral type | F4V (F0V + F1V)[4] |
| U−B color index | -0.03[5] |
| B−V color index | +0.44[5] |
| Astrometry | |
| Radial velocity (Rv) | -8.00 ± 7.40[6] km/s |
| Proper motion (μ) | RA: -83.39[1] mas/yr Dec.: -25.36[1] mas/yr |
| Parallax (π) | 19.13 ± 0.93[1] mas |
| Distance | 170 ± 8 ly (52 ± 3 pc) |
Orbit[3] | |
| Period (P) | 373.0 yr |
| Semi-major axis (a) | 1.519″ |
| Eccentricity (e) | 0.775 |
| Inclination (i) | 74.2° |
| Longitude of the node (Ω) | 112.3° |
| Periastron epoch (T) | B 1958.57 |
Argument of periastron (ω) (secondary) | 90.7° |
| Details | |
| HD 120987 A | |
| Mass | 1.56[7] M☉ |
| HD 120987 B | |
| Mass | 1.53[7] M☉ |
| Other designations | |
CD−35° 9090, HD 120987, HIP 67819, HR 5222, SAO 204955[2] | |
| Database references | |
| SIMBAD | data |
HD 120987 (y Centauri or y Cen) is a star system located in the constellation Centaurus. HD 120987 is a quintuple star system located 50 pc (163 light years) from the Sun. The system has an apparent magnitude of 5.565.[2] Based on the system's parallax, it is located some 172 light-years (52 parsecs) away.[1]
HD 120987 appears to be a single F-type star with the spectral classification F4V, but closer inspection reveals it to be two similar F-type main-sequence stars with spectral classifications of F0V and F1V, respectively.[4] The two orbit each other ever 373 years, and are separated by 1.519 arcseconds while taking a very eccentric orbit.[3]
References[edit]
^ abcdef 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..mw-parser-output cite.citation{font-style:inherit}.mw-parser-output q{quotes:"""""""'""'"}.mw-parser-output code.cs1-code{color:inherit;background:inherit;border:inherit;padding:inherit}.mw-parser-output .cs1-lock-free a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/6/65/Lock-green.svg/9px-Lock-green.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-limited a,.mw-parser-output .cs1-lock-registration a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/d/d6/Lock-gray-alt-2.svg/9px-Lock-gray-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-lock-subscription a{background:url("//upload.wikimedia.org/wikipedia/commons/thumb/a/aa/Lock-red-alt-2.svg/9px-Lock-red-alt-2.svg.png")no-repeat;background-position:right .1em center}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration{color:#555}.mw-parser-output .cs1-subscription span,.mw-parser-output .cs1-registration span{border-bottom:1px dotted;cursor:help}.mw-parser-output .cs1-hidden-error{display:none;font-size:100%}.mw-parser-output .cs1-visible-error{font-size:100%}.mw-parser-output .cs1-subscription,.mw-parser-output .cs1-registration,.mw-parser-output .cs1-format{font-size:95%}.mw-parser-output .cs1-kern-left,.mw-parser-output .cs1-kern-wl-left{padding-left:0.2em}.mw-parser-output .cs1-kern-right,.mw-parser-output .cs1-kern-wl-right{padding-right:0.2em}
^ abc "* y Cen". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 19 July 2017.
^ abc "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 19 July 2017.
^ ab Cvetkovic, Z.; Ninkovic, S. (2010). "On the Component Masses of Visual Binaries". Serbian Astronomical Journal. 180 (180): 71. Bibcode:2010SerAJ.180...71C. doi:10.2298/SAJ1080071C.
^ ab Cousins, A. W. J.; Lagerweij, H. C. (1970). "Comparison Stars for Long Period Variables and RY Sagittarii". Monthly Notes of the Astron. Soc. Southern Africa. 29 (7). Bibcode:1970MNSSA..29....7C.
^ Kharchenko, N. V.; et al. (2007). "Astrophysical supplements to the ASCC-2.5: Ia. Radial velocities of ~55000 stars and mean radial velocities of 516 Galactic open clusters and associations". Astronomische Nachrichten. 328 (9): 889. arXiv:0705.0878. Bibcode:2007AN....328..889K. doi:10.1002/asna.200710776.
^ ab Tokovinin, Andrei (2014). "From Binaries to Multiples. II. Hierarchical Multiplicity of F and G Dwarfs". The Astronomical Journal. 147 (4): 87. arXiv:1401.6827. Bibcode:2014AJ....147...87T. doi:10.1088/0004-6256/147/4/87.
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Categories:
- Centaurus (constellation)
- Bayer objects
- F-type main-sequence stars
- Binary stars
- Durchmusterung objects
- Henry Draper Catalogue objects
- Hipparcos objects
- HR objects
- Multiple star stubs
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