R Microscopii

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)2.54 ± 2.08[3] mas
Distanceapprox. 1,000 ly
(approx. 400 pc)
Other designations
R Microscopii, HD 196717, HIP 101985

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]

References

  1. 1 2 SIMBAD, R Microscopii (accessed 20 March 2015)
  2. 1 2 Watson, Christopher (4 January 2010). "R Microscopii". AAVSO Website. American Association of Variable Star Observers. Retrieved 20 March 2015.
  3. 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.
  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:1208.2037Freely accessible. 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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