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.[2] 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.[4] 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.[5]

R Microscopii
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Microscopium
Right ascension  20h 40m 02.98684s .[1]
Declination −28° 47′ 31.1983″ [1]
Apparent magnitude (V) 8.3-13.8
Characteristics
Spectral type M4e[2]
Astrometry
Parallax (π)1.2239 ± 0.1089[3] mas
Distance2,700 ± 200 ly
(820 ± 70 pc)
Other designations
R Microscopii, HD 196717, HIP 101985, CD–29° 17235
Database references
SIMBADdata

References
  1. SIMBAD, R Microscopii (accessed 20 March 2015)
  2. Watson, Christopher (4 January 2010). "R Microscopii". AAVSO Website. American Association of Variable Star Observers. Retrieved 20 March 2015.
  3. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  4. 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:1208.2037. Bibcode:2012MNRAS.427..343M. doi:10.1111/j.1365-2966.2012.21873.x.
  5. Cooper, Tim (2003). "Presidential address: Amateur Observations - Successes and Opportunities". Monthly Notes of the Astronomical Society of Southern Africa. 62: 234–40. Bibcode:2003MNSSA..62..234C.


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