XX Trianguli

XX Trianguli is a variable star in the constellation Triangulum. It is classified as a RS Canum Venaticorum variable orange giant with spectral type K0III.[1][2] XX Trianguli is notable for having a huge starspot larger than the diameter of the Sun, discovered using Doppler imaging.[3]

XX Trianguli
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Triangulum
Right ascension  02h 03m 47.11354s[1]
Declination +35° 35 28.6597[1]
Apparent magnitude (V) 8.1  8.7[2]
Characteristics
Spectral type K0 III[1]
U−B color index +0.78[2]
Variable type RS Canum Venaticorum variable[2]
Astrometry
Radial velocity (Rv)-26.35 km/s[1] km/s
Parallax (π)6.24±1.02[1] mas
Distance910–1,500[2] ly
(280–460[2] pc)
Details
Radius10.7[2] R
Temperature4820[2] K
Rotation24.3±0.02 days[2]
Details
Radius10.7[2] R
Temperature4820[2] K
Other designations
XX Trianguli, XX Tri, BD+34 363, Gliese 3130, HD 12545, HIP 9630, SAO 55233.[1]
Database references
SIMBADdata

References

  1. "SIMBAD". Retrieved August 16, 2015.
  2. K. G., Strassmeier; K., Olah (June 1992). "On the starspot temperature of HD 12545" (Astronomy and Astrophysics, Volume 259 No. 2). SAO/NASA Astrophysics Data System: 595–599. Bibcode:1992A&A...259..595S. ISSN 0004-6361. Cite journal requires |journal= (help)
  3. Nemiroff, R.; Bonnell, J., eds. (2 November 2003). "A Giant Starspot on HD 12545". Astronomy Picture of the Day. NASA.


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