Iota Microscopii

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ι Microscopii
Microscopium constellation map.svg
Red circle.svg

Location of ι Microscopii (circled)
Observation data
Epoch J2000      Equinox J2000
Constellation Microscopium
Right ascension 20h 48m 29.13901s[1]
Declination −43° 59′ 18.7397″[1]
Apparent magnitude (V) 5.11[2]
Spectral type F1IV[3]
U−B color index +0.04[4]
B−V color index +0.35[5]
Radial velocity (Rv) -14.90[6] km/s
Proper motion (μ) RA: +172.34[1] mas/yr
Dec.: -109.61[1] mas/yr
Parallax (π) 28.23 ± 0.99[1] mas
Distance 116 ± 4 ly
(35 ± 1 pc)
Absolute magnitude (MV) 2.05[2]
Mass 1.67[7] M
Radius 2.4[7] R
Luminosity 12.65[2] L
Surface gravity (log g) 3.90[8] cgs
Temperature 6,997[8] K
Metallicity [Fe/H] -0.03[2] dex
Rotational velocity (v sin i) 84[3] km/s
Other designations
CD-44 14145, CCDM J20485-4359A, FK5 1542, GC 28980, GJ 9708, HIP 102693, HR 7943, HD 197937, SAO 230379, WDS J20485-4359A
Database references

Iota Microscopii (ι Mic) is a class F1IV[3] (yellow-white subgiant) star in the constellation Microscopium. Its apparent magnitude is 5.11[2] and it is approximately 116 light years away based on parallax.[1]

It has one companion, first observed in 1932, with a separation of 4.3" and a visual magnitude of 15.5.[9]


  1. ^ a b c d e f Van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics. 474 (2): 653. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357.  Vizier catalog entry
  2. ^ a b c d e Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331. arXiv:1108.4971Freely accessible. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015.  Vizier catalog entry
  3. ^ a b c 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. ^ Mermilliod, J. C. (2006). "VizieR Online Data Catalog: Homogeneous Means in the UBV System (Mermilliod 1991)". VizieR On-line Data Catalog: II/168. Originally published in: Institut d'Astronomie. 2168. Bibcode:2006yCat.2168....0M. Vizier catalog entry
  5. ^ Mallama, A. (2014). "Sloan Magnitudes for the Brightest Stars". The Journal of the American Association of Variable Star Observers. 42: 443. Bibcode:2014JAVSO..42..443M. Vizier catalog entry
  6. ^ Gontcharov, G. A. (2006). "Pulkovo Compilation of Radial Velocities for 35 495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. 
  7. ^ a b 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. arXiv:astro-ph/9911002Freely accessible. Bibcode:1999A&A...352..555A.  Vizier catalog entry
  8. ^ a b 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:1501.03154Freely accessible. Bibcode:2015ApJ...804..146D. doi:10.1088/0004-637X/804/2/146.  Vizier catalog entry
  9. ^ Mason, Brian D.; Wycoff, Gary L.; Hartkopf, William I.; Douglass, Geoffrey G.; Worley, Charles E. (2001). "The 2001 US Naval Observatory Double Star CD-ROM. I. The Washington Double Star Catalog". The Astronomical Journal. 122 (6): 3466. Bibcode:2001AJ....122.3466M. doi:10.1086/323920.  Vizier catalog entry