Epsilon Microscopii
  | |
| Observation data EpochJ2000EquinoxJ2000 | |
|---|---|
| Constellation | Microscopium |
| Right ascension | 21h17m56.28399s[1] |
| Declination | −32° 10′ 21.1515″[1] |
| Apparent magnitude(V) | 4.71[2] |
| Characteristics | |
| Spectral type | A1V[3] |
| U−Bcolor index | +0.02[4] |
| B−Vcolor index | +0.06[4] |
| Astrometry | |
| Radial velocity(Rv) | +7.20[5]km/s |
| Proper motion(μ) | RA:+54.36[1]mas/yr Dec.:−23.29[1]mas/yr |
| Parallax(π) | 19.7054 ± 0.5472mas[6] |
| Distance | 166 ± 5ly (51 ± 1pc) |
| Absolute magnitude(MV) | 0.97[2] |
| Details | |
| Mass | 2.18[7]M☉ |
| Radius | 2.2[7]R☉ |
| Luminosity | 35.62[2]L☉ |
| Surface gravity(logg) | 4.37[8]cgs |
| Temperature | 9,126[8]K |
| Metallicity[Fe/H] | −0.01[9]dex |
| Rotational velocity(vsini) | 127[3]km/s |
| Age | 525[8]Myr |
| Other designations | |
| Database references | |
| SIMBAD | data |
Epsilon Microscopii,Latinizedfrom ε Microscopii, is a single,[10]white-huedstarin the southernconstellationofMicroscopium.It is faintly visible to the naked eye with anapparent visual magnitudeof 4.71.[2]The annualparallax shiftof the star is 19.7054mas[1]as measured from Earth, which yields a distance estimate of around 166light years.It is moving further from the Sun with aradial velocityof +7 km/s.[5]
This star has astellar classificationof A1 V,[3]indicating it is anA-type main-sequence starthat is generating energy throughhydrogen fusionat itscore.Thestellar spectrumdisplays an overabundance of silicon in thestar's atmosphere,[11]but the abundance of iron is the same as in the Sun.[9]The star has 2.2 times themass of the Sunand 2.2 times theSun's radius.[7]It is around a half billion years old[8]and is spinning rapidly with aprojected rotational velocityof 127 km/s.[3]Epsilon Microscopii is radiating about 36 times theSun's luminosity[2]from itsphotosphereat aneffective temperatureof 9,126 K.[8]
Epsilon Microscopii was a latter designation of the star4 Piscis Austrini.[12]
This star was the brightest star in the obsolete constellationGlobus Aerostaticus.[13]
References
[edit]- ^abcdeVan 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.S2CID18759600.Vizier catalog entry
- ^abcdeAnderson, 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.S2CID119257644.Vizier catalog entry
- ^abcdHoffleit, D.; Warren, W. H. (1995). "VizieR Online Data Catalog: Bright Star Catalogue, 5th Revised Ed. (Hoffleit+, 1991)".VizieR On-line Data Catalog: V/50. Originally Published in: 1964BS....C......0H.5050.Bibcode:1995yCat.5050....0H.
- ^abMallama, A. (2014). "Sloan Magnitudes for the Brightest Stars".The Journal of the American Association of Variable Star Observers.42(2): 443.Bibcode:2014JAVSO..42..443M.Vizier catalog entry
- ^abGontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system".Astronomy Letters.32(11): 759–771.arXiv:1606.08053.Bibcode:2006AstL...32..759G.doi:10.1134/S1063773706110065.S2CID119231169.
- ^Brown, A. G. A.;et al. (Gaia collaboration) (August 2018)."GaiaData Release 2: Summary of the contents and survey properties ".Astronomy & Astrophysics.616.A1.arXiv:1804.09365.Bibcode:2018A&A...616A...1G.doi:10.1051/0004-6361/201833051.Gaia DR2 record for this sourceatVizieR.
- ^abcAllende Prieto, C.; Lambert, D. L. (1999). "Fundamental parameters of nearby stars from the comparison with evolutionary calculations: Masses, radii and effective temperatures".Astronomy and Astrophysics.352:555–562.arXiv:astro-ph/9911002.Bibcode:1999A&A...352..555A.Vizier catalog entry
- ^abcdeDavid, 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.S2CID33401607.Vizier catalog entry
- ^abGontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood".Astronomy Letters.38(12): 771–782.arXiv:1606.08814.Bibcode:2012AstL...38..771G.doi:10.1134/S1063773712120031.S2CID118345778.Vizier catalog entry
- ^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.S2CID14878976.
- ^Renson, P.; Manfroid, J. (May 2009),"Catalogue of Ap, HgMn and Am stars",Astronomy and Astrophysics,498(3): 961–966,Bibcode:2009A&A...498..961R,doi:10.1051/0004-6361/200810788.
- ^Wagman, M. (August 1987). "Flamsteed's Missing Stars".Journal for the History of Astronomy.18(3): 220.Bibcode:1987JHA....18..209W.doi:10.1177/002182868701800305.S2CID118445625.
- ^Ian Ridpath's Star Tales - Globus Aerostaticus
