Astronomy:Zeta Microscopii
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Microscopium |
| Right ascension | 21h 02m 57.95290s[1] |
| Declination | −38° 37′ 53.2099″[1] |
| Apparent magnitude (V) | 5.31[2] |
| Characteristics | |
| Spectral type | F5 V[3] |
| B−V color index | +0.41[2] |
| Astrometry | |
| Radial velocity (Rv) | +4.6[4] km/s |
| Proper motion (μ) | RA: −29.16[1] mas/yr Dec.: −108.85[1] mas/yr |
| Parallax (π) | 28.27 ± 0.33[1] mas |
| Distance | 115 ± 1 ly (35.4 ± 0.4 pc) |
| Absolute magnitude (MV) | 2.58[5] |
| Details | |
| Mass | 1.40[6] M☉ |
| Luminosity | 7.5[7] L☉ |
| Surface gravity (log g) | 3.97[6] cgs |
| Temperature | 6,627±225[6] K |
| Metallicity [Fe/H] | −0.13[3] dex |
| Rotational velocity (v sin i) | 44.4±2.2[5] km/s |
| Age | 2.2[6] Gyr |
| Other designations | |
| Database references | |
| SIMBAD | data |
ζ Microscopii, Latinised as Zeta Microscopii, is a solitary,[9] yellow-white hued star in the southern constellation of Microscopium. It is faintly visible to the naked eye with an apparent visual magnitude of +5.31.[2] Based upon an annual parallax shift of 28.27 mas as seen from the Earth,[1] it is 115 light years from the Sun. The star is moving away from the Sun with a radial velocity of +4.6 km/s.[4]
This is an F-type main-sequence star with a stellar classification of F5 V.[3] This indicates that, at the age of 2.2[6] billion years, it is still generating energy through hydrogen fusion at its core. It is radiating 7.5[7] times the Sun's luminosity from its photosphere at an effective temperature of 6,471 K.[6] The star has an estimated 1.4[6] times the mass of the Sun and is spinning with a moderately high projected rotational velocity of 44.4 km/s.[5]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 1.5 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.
- ↑ 2.0 2.1 2.2 Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa 27: 11, Bibcode: 1968MNSSA..27...11C.
- ↑ 3.0 3.1 3.2 Gray, R. O. et al. (July 2006), "Contributions to the Nearby Stars (NStars) Project: spectroscopy of stars earlier than M0 within 40 pc-The Southern Sample", The Astronomical Journal 132 (1): 161–170, doi:10.1086/504637, Bibcode: 2006AJ....132..161G.
- ↑ 4.0 4.1 Wielen, R. et al. (1999), "Sixth Catalogue of Fundamental Stars (FK6). Part I. Basic fundamental stars with direct solutions", Veroeffentlichungen des Astronomischen Rechen-Instituts Heidelberg (Astronomisches Rechen-Institut Heidelberg) 35: 1, Bibcode: 1999VeARI..35....1W.
- ↑ 5.0 5.1 5.2 Ammler-von Eiff, Matthias; Reiners, Ansgar (June 2012), "New measurements of rotation and differential rotation in A-F stars: are there two populations of differentially rotating stars?", Astronomy & Astrophysics 542: A116, doi:10.1051/0004-6361/201118724, Bibcode: 2012A&A...542A.116A.
- ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 David, Trevor J.; Hillenbrand, Lynne A. (2015), "The Ages of Early-Type Stars: Strömgren Photometric Methods Calibrated, Validated, Tested, and Applied to Hosts and Prospective Hosts of Directly Imaged Exoplanets", The Astrophysical Journal 804 (2): 146, doi:10.1088/0004-637X/804/2/146, Bibcode: 2015ApJ...804..146D.
- ↑ 7.0 7.1 McDonald, I. et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society 427 (1): 343–57, doi:10.1111/j.1365-2966.2012.21873.x, Bibcode: 2012MNRAS.427..343M.
- ↑ "zet Mic". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=zet+Mic.
- ↑ 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.
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