R Cancri
| Observation data Epoch J2000 Equinox J2000 | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 16m 33.82789s[1] |
| Declination | +11° 43′ 34.4557″[1] |
| Apparent magnitude (V) | 8.64[2] |
| Characteristics | |
| Spectral type | M6.5-9e[3] |
| U−B color index | 0.49[2] |
| B−V color index | 1.53[2] |
| Variable type | Mira[4] |
| Astrometry | |
| Radial velocity (Rv) | 35.42 ± 0.52[5] km/s |
| Proper motion (μ) | RA: 4.31 ± 1.57[1] mas/yr Dec.: -12.58 ± 0.75[1] mas/yr |
| Parallax (π) | 1.58 ± 1.43[1] mas |
| Distance | approx. 2,000 ly (approx. 600 pc) |
| Absolute magnitude (MV) | −0.36 |
R Cancri is a Mira variable in the constellation Cancer. Located approximately 633 parsecs (2,060 ly) distant, it varies between magnitudes 6.07 and 11.9 over a period of approximately 357 days.[4]
References
- ↑ 1.0 1.1 1.2 1.3 1.4 van Leeuwen, F. (2007). "Validation of the new Hipparcos reduction". Astronomy and Astrophysics 474 (2): 653–664. arXiv:0708.1752. Bibcode:2007A&A...474..653V. doi:10.1051/0004-6361:20078357. Vizier catalog entry
- ↑ 2.0 2.1 2.2 Ducati, J. R. (2002). "VizieR Online Data Catalog: Catalogue of Stellar Photometry in Johnson's 11-color system". CDS/ADC Collection of Electronic Catalogues 2237: 0. Bibcode:2002yCat.2237....0D.
- ↑ Keenan, P. C.; Garrison, R. F.; Deutsch, A. J. (1974). "Revised Catalog of Spectra of Mira Variables of Types ME and Se". The Astrophysical Journal Supplement Series 28: 271. doi:10.1086/190318.
- ↑ 4.0 4.1 VSX; Otero, S. A. (7 January 2011). "R Cancri". AAVSO Website. American Association of Variable Star Observers. Retrieved 15 March 2015.
- ↑ Famaey, B.; Jorissen, A.; Luri, X.; Mayor, M.; Udry, S.; Dejonghe, H.; Turon, C. (2005). "Local kinematics of K and M�giants from CORAVEL/Hipparcos/Tycho-2 data". Astronomy and Astrophysics 430: 165. doi:10.1051/0004-6361:20041272.
| ||||||||||||||||||||||||||||||||||||||||||||||||||||||||||