R Microscopii

R Microscopii is a star in the constellation Microscopium. It is a red giant star of spectral type M4e that is also a Mira variable, with an apparent magnitude ranging between 8.3 and 13.8 over 138 days.^[3] Located around 1000 light-years distant, it shines with a luminosity 444 times that of the Sun and has a surface temperature of 3141 K.^[5] The Astronomical Society of Southern Africa in 2003 reported that observations of R Microscopii were urgently needed as data on its light curve was incomplete.^[6]

R Microscopii

The visual band light curve of R Microscopii, from AAVSO data[1]
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Microscopium
Right ascension	20h 40m 02.98684s .[2]
Declination	−28° 47′ 31.1983″ [2]
Apparent magnitude (V)	8.3-13.8
Characteristics
Spectral type	M4e[3]
Astrometry
Parallax (π)	1.2239±0.1089 mas[4]
Distance	2,700 ± 200 ly (820 ± 70 pc)
Other designations
R Microscopii, HD 196717, HIP 101985, CD–29° 17235
Database references
SIMBAD	data