Nu Microscopii

ν Microscopii, Latinized as Nu Microscopii, is a star in the constellation Microscopium. It is an orange-hued star that is visible to the naked eye as a faint point of light with an apparent visual magnitude of 5.12. It is located at a distance of around 252 light-years from the Sun, based on parallax, and is drifting further away with a radial velocity of about +9 km/s.

ν Microscopii

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Microscopium
Right ascension	20h 33m 55.07257s[1]
Declination	−44° 30′ 57.7642″[1]
Apparent magnitude (V)	5.12[2]
Characteristics
Evolutionary stage	red giant branch[1]
Spectral type	K0 III[3]
U−B color index	+1.009[4]
B−V color index	+0.999±0.002[2]
Astrometry
Radial velocity (Rv)	8.7±2[5] km/s
Proper motion (μ)	RA: +11.560[1] mas/yr Dec.: −35.355[1] mas/yr
Parallax (π)	12.9361±0.0955 mas[1]
Distance	252 ± 2 ly (77.3 ± 0.6 pc)
Absolute magnitude (MV)	+0.84[2]
Details
Mass	2.46[6] M☉
Radius	11[1] R☉
Luminosity	59[1] L☉
Surface gravity (log g)	2.78[6] cgs
Temperature	4,832[1] K
Metallicity [Fe/H]	+0.05±0.10[6] dex
Rotational velocity (v sin i)	2.02[6] km/s
Age	377[1] Myr
Other designations
ν Mic, ν Ind, CD−44°14020, FK5 3643, HD 195569, HIP 101477, HR 7846, SAO 230276[7]
Database references
SIMBAD	data

ν Microscopii is an aging giant star with a stellar classification of K0 III.^[3] It has expanded to 11 times the girth of the Sun after exhausting the supply of hydrogen at its core and evolving off the main sequence. The star has 2.46 times the mass of the Sun.^[6] It is radiating 59 times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,832 K.

ν Microscopii 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] Despite this, most recent studies and the SIMBAD database use the designation Nu Indi for the star HD 211998.^{[9][10][11][12][13]}