Pi Centauri
Pi Centauri
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| Observation data Epoch J2000.0 Equinox J2000.0 | |
|---|---|
Constellation | Centaurus |
Right ascension | 11h 21m 00.41s[1] |
Declination | −54° 29′ 27.7″[1] |
Apparent magnitude (V) | +3.836[2] |
| Characteristics | |
Spectral type | B5V[2] |
| U−B color index | −0.59 |
| B−V color index | −0.15 |
Variable type | none |
| Astrometry | |
| Radial velocity (Rv) | +9 km/s |
| Proper motion (μ) | RA: -35.85 ± 0.34[1] mas/yr Dec.: -1.72 ± 0.27[1] mas/yr |
| Parallax (π) | 9.12 ± 0.34[1] mas |
| Distance | 360 ± 10 ly (110 ± 4 pc) |
| Absolute magnitude (MV) | −1.30[2] |
Orbit[3] | |
| Primary | π Centauri A |
| Companion | π Centauri B |
| Period (P) | 39.0 ± 0.19 yr |
| Semi-major axis (a) | 0.2263 ± 0.0011″ |
| Eccentricity (e) | 0.8530 ± 0.0040 |
| Inclination (i) | 19.4 ± 4.9° |
| Longitude of the node (Ω) | 327.8 ± 3.9° |
| Periastron epoch (T) | 2010.410 ± 0.037 |
Argument of periastron (ω) (secondary) | 340.3 ± 4.0° |
| Details | |
| Luminosity | 783[2] L☉ |
| Other designations | |
π Cen, BD−53° 4498, FK5 428, GC 15601, HD 98718, HIP 55425, HR 4390, SAO 238986, CCDM J11210-5429 | |
| Database references | |
| SIMBAD | data |
Pi Centauri, Latinized from π Centauri, is a binary star in the constellation Centaurus. It is approximately 360 light years from Earth.
Both components are blue-white B-type main sequence dwarfs. The primary π Centauri A, has an apparent magnitude of +4.3, while the apparent magnitude of its companion, π Centauri B, is +5.0. The two stars orbit around their common centre of mass once every 39 years.[3] The semi-major axis of the companion is 0.23 arcseconds on the sky.
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
^ abcd 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.
^ ab Tokovinin, Andrei (2012). "Speckle Interferometry and Orbits of "Fast" Visual Binaries". The Astronomical Journal. 144 (2). 56. arXiv:1206.1882. Bibcode:2012AJ....144...56T. doi:10.1088/0004-6256/144/2/56.
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Categories:
- Bayer objects
- Binary stars
- B-type main-sequence stars
- Centaurus (constellation)
- Hipparcos objects
- Henry Draper Catalogue objects
- Durchmusterung objects
- HR objects
- Multiple star stubs
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