HD 117440
HD 117440
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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
Constellation | Centaurus |
Right ascension | 13h 31m 02.66s[1] |
Declination | −39° 24′ 26.3″[1] |
Apparent magnitude (V) | +4.5/+4.7 |
| Characteristics | |
Spectral type | G8III/G9III |
| U−B color index | +1.03 |
| B−V color index | +1.17 |
Variable type | none |
| Astrometry | |
| Radial velocity (Rv) | −2 km/s |
| Proper motion (μ) | RA: -15.67 ± 0.47[1] mas/yr Dec.: -10.49 ± 0.31[1] mas/yr |
| Parallax (π) | 3.60 ± 0.49[1] mas |
| Distance | approx. 900 ly (approx. 280 pc) |
| Absolute magnitude (MV) | −3.4/−3.2 |
Orbit[2] | |
| Period (P) | 83.14 ± 1.26 yr |
| Semi-major axis (a) | 0.161 ± 0.004″ |
| Eccentricity (e) | 0.521 ± 0.013 |
| Inclination (i) | 145.2 ± 4.0° |
| Longitude of the node (Ω) | 146.5 ± 8.6° |
| Periastron epoch (T) | B 1956.12 ± 1.91 |
Argument of periastron (ω) (secondary) | 244.4 ± 3.6° |
| Other designations | |
HR 5089, HD 117440, CD−38°8592, HIP 65936, SAO 204545, GC 18254, CCDM J13310-3924 | |
| Database references | |
| SIMBAD | data |
HD 117440, also known by its Bayer designation d Centauri (d Cen), is a binary star in the constellation Centaurus. It is approximately 900 light years from Earth.
Both components are yellow G-type giant stars. The primary, d Centauri A, has an apparent magnitude of +4.5, while the secondary, d Centauri B, has an apparent magnitude of +4.7. The two stars orbit around their common centre of mass once every 83 years and the secondary has a semi-major axis of 0.161 arcseconds.[2]
References[edit]
^ abcde van Leeuwen, F. (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}
Vizier catalog entry
^ ab "Sixth Catalog of Orbits of Visual Binary Stars". United States Naval Observatory. Retrieved 21 May 2017.
 | This binary or multiple star system–related article is a stub. You can help Wikipedia by expanding it. |
Categories:
- Bayer objects
- Binary stars
- Centaurus (constellation)
- Henry Draper Catalogue objects
- G-type giants
- HR objects
- Hipparcos objects
- Durchmusterung objects
- Multiple star stubs
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