Astronomy:Epsilon Microscopii

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Short description: Star in the constellation Microscopium
ε Microscopii
Location of ε Microscopii (circled)
Observation data
Equinox J2000.0]] (ICRS)
Constellation Microscopium[1]
Right ascension  21h 17m 56.28399s[2]
Declination −32° 10′ 21.1515″[2]
Apparent magnitude (V) 4.71[1]
Characteristics
Spectral type A1V[3]
U−B color index +0.02[4]
B−V color index +0.06[4]
Astrometry
Radial velocity (Rv)+7.20[5] km/s
Proper motion (μ) RA: +54.36[2] mas/yr
Dec.: −23.29[2] mas/yr
Parallax (π)19.7054 ± 0.5472[6] mas
Distance166 ± 5 ly
(51 ± 1 pc)
Absolute magnitude (MV)0.97[1]
Details
Mass2.18[7] M☉
Radius2.2[7] R☉
Luminosity35.62[1] L☉
Surface gravity (log g)4.37[8] cgs
Temperature9,126[8] K
Metallicity [Fe/H]−0.01[9] dex
Rotational velocity (v sin i)127[3] km/s
Age525[8] Myr
Other designations
Aerostaticus, ε Mic, CD−32°16498, CPD−32°6329, FK5 801, GC 29774, HD 202627, HIP 105140, HR 8135, SAO 212874
Database references
SIMBADdata

Epsilon Microscopii, also named Aerostaticus,[10] is a single,[11] white-hued star in the southern constellationof Microscopium. It is faintly visible to the naked eye with an apparent visual magnitude of 4.71.[1] The annual parallax shift of the star is 19.7054 mas[2] as measured from Earth, which yields a distance estimate of around 166 light years. It is moving further from the Sun with a radial velocity of +7 km/s.[5]

This star has a stellar classification of A1 V,[3] indicating it is an A-type main-sequence star that is generating energy through hydrogen fusion at its core. The stellar spectrum displays an overabundance of silicon in the star's atmosphere,[12] but the abundance of iron is the same as in the Sun.[9] The star has 2.2 times the mass of the Sun and 2.2 times the Sun's radius.[7] It is around a half billion years old[8] and is spinning rapidly with a projected rotational velocity of 127 km/s.[3] Epsilon Microscopii is radiating about 36 times the Sun's luminosity[1] from its photosphere at an effective temperature of 9,126 K.[8]

Epsilon Microscopii, Latinized from ε Microscopii, is the star's Bayer designation. It also had the Flamsteed designation 4 Piscis Austrini, assigned before the constellation Microscopium was invented by Lacaille.[13]

This star was the brightest star in the obsolete constellation Globus Aerostaticus, the hot air balloon, with Johann Elert Bode designating it with the Latin letter a.[14] The IAU Working Group on Star Names adopted the name Aerostaticus for this star on 16 July 2026, after the obsolete constellation.[10]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A  XHIP record for this object at VizieR.
  2. ↑ 2.0 2.1 2.2 2.3 2.4 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.  Vizier catalog entry
  3. ↑ 3.0 3.1 3.2 3.3 Hoffleit, 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. 
  4. ↑ 4.0 4.1 Mallama, 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
  5. ↑ 5.0 5.1 Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters 32 (11): 759–771. doi:10.1134/S1063773706110065. Bibcode: 2006AstL...32..759G. 
  6. ↑ Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  7. ↑ 7.0 7.1 7.2 Allende 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. Bibcode: 1999A&A...352..555A.  Vizier catalog entry
  8. ↑ 8.0 8.1 8.2 8.3 8.4 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.  Vizier catalog entry
  9. ↑ 9.0 9.1 Gontcharov, G. A. (2012). "Dependence of kinematics on the age of stars in the solar neighborhood". Astronomy Letters 38 (12): 771–782. doi:10.1134/S1063773712120031. Bibcode: 2012AstL...38..771G.  Vizier catalog entry
  10. ↑ 10.0 10.1 "IAU Catalog of Star Names". https://exopla.net/star-names/modern-iau-star-names/. 
  11. ↑ 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. 
  12. ↑ Renson, P.; Manfroid, J. (May 2009), "Catalogue of Ap, HgMn and Am stars", Astronomy and Astrophysics 498 (3): 961–966, doi:10.1051/0004-6361/200810788, Bibcode: 2009A&A...498..961R, https://zenodo.org/record/890529. 
  13. ↑ Wagman, M. (August 1987). "Flamsteed's Missing Stars". Journal for the History of Astronomy 18 (3): 220. doi:10.1177/002182868701800305. Bibcode: 1987JHA....18..209W. 
  14. ↑ Ian Ridpath's Star Tales - Globus Aerostaticus



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