Phi1 Lupi
Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Lupus |
Right ascension | 15h 21m 48.36967s[1] |
Declination | −36° 15′ 40.9525″[1] |
Apparent magnitude (V) | 3.58[2] |
Characteristics | |
Spectral type | K5 III[3] |
U−B color index | +1.85[2] |
B−V color index | +1.53[2] |
Astrometry | |
Radial velocity (Rv) | ±0.7 −29.4[4] km/s |
Proper motion (μ) | RA: −92.33[1] mas/yr Dec.: −85.67[1] mas/yr |
Parallax (π) | 11.86 ± 0.16[1] mas |
Distance | 275 ± 4 ly (84 ± 1 pc) |
Absolute magnitude (MV) | −1.55[5] |
Details | |
Radius | 52[6] R☉ |
Temperature | ±59 3,894[7] K |
Other designations | |
Database references | |
SIMBAD | data |
Phi1 Lupi is a solitary[9] star in the southern constellation of Lupus. It is visible to the naked eye with an apparent visual magnitude of 3.58.[2] Based upon an annual parallax shift of 11.86 mas as seen from Earth, it is located around 275 light years from the Sun.
This is an evolved K-type giant star with a stellar classification of K5 III,[3] which means it has used up its core hydrogen and has expanded. The measured angular diameter, after correction for limb darkening, is ±0.07 mas. 5.69[10] At the estimated distance of Phi1 Lupi, this yields a physical size of about 52 times the radius of the Sun.[6] It is a variable star of unknown type, with an amplitude of 0.008 in visual magnitude and a period of 4.82 days.[11]
References
- 1 2 3 4 5 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.
- 1 2 3 4 Mermilliod, J.-C. (1986), "Compilation of Eggen's UBV data, transformed to UBV (unpublished)", Catalogue of Eggen's UBV data, SIMBAD, Bibcode:1986EgUBV........0M.
- 1 2 Houk, Nancy (1979), Michigan catalogue of two-dimensional spectral types for the HD stars, 3, Ann Arbor, Michigan: Dept. of Astronomy, University of Michigan, Bibcode:1982mcts.book.....H.
- ↑ 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, arXiv:1208.3048, Bibcode:2012A&A...546A..61D, doi:10.1051/0004-6361/201219219, A61.
- ↑ Ginestet, N.; et al. (February 2000), "Magnitudes absolues des étoiles standards MK des types G à M à partir des parallaxes Hipparcos" [The absolute magnitudes of the G to M type MK standards from the Hipparcos parallaxes], Astronomy and Astrophysics Supplement (in French), 142: 13–24, Bibcode:2000A&AS..142...13G, doi:10.1051/aas:2000135.
- 1 2 Lang, Kenneth R. (2006), Astrophysical formulae, Astronomy and astrophysics library, 1 (3rd ed.), Birkhäuser, ISBN 3-540-29692-1.
The radius (R*) is given by:
- ↑ Strassmeier, K. G.; Schordan, P. (2000), "A temperature calibration for MK-class III giants from high-resolution spectral line-depth ratios", Astronomische Nachrichten, 321 (5): 277–305, Bibcode:2000AN....321..277S, doi:10.1002/1521-3994(200012)321:5/6<277::AID-ASNA277>3.0.CO;2-H.
- ↑ "* phi01 Lup". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-03-10.
- ↑ 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, arXiv:0806.2878, Bibcode:2008MNRAS.389..869E, doi:10.1111/j.1365-2966.2008.13596.x.
- ↑ Richichi, A.; et al. (February 2005), "CHARM2: An updated Catalog of High Angular Resolution Measurements", Astronomy and Astrophysics, 431 (2): 773–777, Bibcode:2005A&A...431..773R, doi:10.1051/0004-6361:20042039.
- ↑ Koen, Chris; Eyer, Laurent (March 2002), "New periodic variables from the Hipparcos epoch photometry", Monthly Notices of the Royal Astronomical Society, 331 (1): 45–59, arXiv:astro-ph/0112194, Bibcode:2002MNRAS.331...45K, doi:10.1046/j.1365-8711.2002.05150.x.
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