Zeta Microscopii

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]

Zeta Microscopii
Observation data
Epoch J2000.0      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 mas[1]
Distance115 ± 1 ly
(35.4 ± 0.4 pc)
Absolute magnitude (MV)2.58[5]
Details
Mass1.40[6] M☉
Luminosity7.5[7] L☉
Surface gravity (log g)3.97[6] cgs
Temperature6,627±225[6] K
Metallicity [Fe/H]−0.13[3] dex
Rotational velocity (v sin i)44.4±2.2[5] km/s
Age2.2[6] Gyr
Other designations
ζ Mic, CD−39° 14089, FK5 790, GC 29363, HD 200163, HIP 103882, HR 8048, SAO 212666[8]
Database references
SIMBADdata

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. 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, S2CID 18759600.
  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. 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, arXiv:astro-ph/0603770, Bibcode:2006AJ....132..161G, doi:10.1086/504637, S2CID 119476992.
  4. 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. 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, arXiv:1204.2459, Bibcode:2012A&A...542A.116A, doi:10.1051/0004-6361/201118724, S2CID 53666672.
  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, arXiv:1501.03154, Bibcode:2015ApJ...804..146D, doi:10.1088/0004-637X/804/2/146, S2CID 33401607.
  7. McDonald, I.; et al. (2012), "Fundamental Parameters and Infrared Excesses of Hipparcos Stars", Monthly Notices of the Royal Astronomical Society, 427 (1): 343–57, arXiv:1208.2037, Bibcode:2012MNRAS.427..343M, doi:10.1111/j.1365-2966.2012.21873.x, S2CID 118665352.
  8. "zet Mic". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-08-12.
  9. 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, S2CID 14878976.
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