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]
| 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 |
| Distance | 910–1,500[2] ly (280–460[2] pc) |
| Details | |
| Radius | 10.7[2] R☉ |
| Temperature | 4820[2] K |
| Rotation | 24.3±0.02 days[2] |
| Details | |
| Radius | 10.7[2] R☉ |
| Temperature | 4820[2] K |
| Other designations | |
| Database references | |
| SIMBAD | data |
References
- "SIMBAD". Retrieved August 16, 2015.
- 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) - Nemiroff, R.; Bonnell, J., eds. (2 November 2003). "A Giant Starspot on HD 12545". Astronomy Picture of the Day. NASA.
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