Nu Microscopii

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ν Microscopii
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Microscopium
Right ascension 20h 33m 55.07245s[1]
Declination −44° 30′ 57.7709″[1]
Apparent magnitude (V) 5.127[2]
Spectral type K0III[3]
U−B color index +1.009[4]
B−V color index +0.798[4]
Radial velocity (Rv) 8.7 ± 2 [5] km/s
Proper motion (μ) RA: 11.49[1] mas/yr
Dec.: -35.42[1] mas/yr
Parallax (π) 13.94 ± 0.34[1] mas
Distance 234 ± 6 ly
(72 ± 2 pc)
Mass 2.46 M
Radius 10.13 R
Luminosity 53.6 L
Surface gravity (log g) 2.78 cgs
Temperature 4980 K
Metallicity [Fe/H] 0.05 ± 0.10 dex
Rotational velocity (v sin i) 2.02 km/s
Other designations
ν Microscopii, HD 195569, HIP 101477, HR 7846, SAO 230276[2]
Database references

ν Microscopii, Latinised as Nu Microscopii, is a star in the constellation Microscopium. It is an orange giant star of spectral type K0III; the apparent magnitude is 5.13.[2] Located around 230 light-years (72 parsecs) away from the Earth, it shines with a luminosity approximately 50 times that of the Sun and has a surface temperature of 4834 K.[7]

It was first catalogued as Nu Indi by the French explorer and astronomer Nicolas Louis de Lacaille in 1756, before being reclassified in Microscopium and given its current Bayer designation of Nu Microscopii by Gould.[8]


  1. ^ a b c d e van Leeuwen, F. (2007). "Validation of the New Hipparcos Reduction". Astronomy and Astrophysics. 474 (2): 653–64. arXiv:0708.1752Freely accessible. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. 
  2. ^ a b c "nu. Mic". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 3 February 2017. 
  3. ^ Houk, Nancy (1978). "Michigan catalogue of two-dimensional spectral types for the HD stars". Accessed using SIMBAD
  4. ^ a b Oja, T. (1970). "UBV-Fotometri danska Tel (ESO)". Bibcode:1970Priv.........0O. Accessed using SIMBAD
  5. ^ Wilson, Ralph Elmer (1953). "General catalogue of stellar radial velocities". Bibcode:1953GCRV..C......0W. 
  6. ^ Jones, M. I.; Jenkins, J. S.; Rojo, P.; Melo, C. H. F. "Study of the impact of the post-MS evolution of the host star on the orbits of close-in planets. I. Sample definition and physical properties". Astronomy & Astrophysics. 536: 71–76. arXiv:1110.6459Freely accessible. Bibcode:2011A&A...536A..71J. doi:10.1051/0004-6361/201117887. 
  7. ^ McDonald, I.; Zijlstra, A. A.; Boyer, M. L. (2012). "Fundamental Parameters and Infrared Excesses of Hipparcos Stars". Monthly Notices of the Royal Astronomical Society. 427 (1): 343–57. arXiv:1208.2037Freely accessible. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x. 
  8. ^ Wagman, Morton (2003). Lost Stars: Lost, Missing and Troublesome Stars from the Catalogues of Johannes Bayer, Nicholas Louis de Lacaille, John Flamsteed, and Sundry Others. Blacksburg, Virginia: The McDonald & Woodward Publishing Company. pp. 181, 210. ISBN 978-0-939923-78-6.