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R Cancri

The visual band light curve of R Cancri, from AAVSO data
Observation data Epoch J2000      Equinox J2000
Constellation	Cancer
Right ascension	08 16 33.82673
Declination	+11° 43′ 34.4691″
Apparent magnitude (V)	6.07 - 12.3
Characteristics
Spectral type	M6e-M9e
U−B color index	0.49
B−V color index	1.53
Variable type	Mira
Astrometry
Radial velocity (Rv)	35.42 ± 0.52 km/s
Proper motion (μ)	RA: 0.635±0.195 mas/yr Dec.: −10.785±0.106 mas/yr
Parallax (π)	3.9375 ± 0.1792 mas
Distance	854+36 −39 ly (262+11 −12 pc)
Details
Mass	1.67 M☉
Radius	371±37 R☉
Luminosity	5,700 L☉
Surface gravity (log g)	−0.608 cgs
Temperature	2,604±300 K
Metallicity	+0.29 dex
Other designations
BD+12°1803, HD 69243, HIP 40534, HR 3248, SAO 97694
Database references
SIMBAD	data

R Cancri is a Mira variable in the constellation Cancer. Located approximately 250 parsecs (830 ly) distant, it varies between magnitudes 6.07 and 12.3 over a period of approximately 357 days. At its brightest, it is very faintly visible to the naked eye.

Friedrich Magnus Schwerd discovered R Cancri in 1829. It was one of the first variable stars to be discovered.

Notes

1. Calculated using the given radius and temperature by the Stefan-Boltzmann law.

References

1. "Download Data". aavso.org. AAVSO. Retrieved 1 October 2021.
2. ^ Brown, A. G. A.; et al. (Gaia collaboration) (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics. 649: A1. arXiv:2012.01533. Bibcode:2021A&A...649A...1G. doi:10.1051/0004-6361/202039657. S2CID 227254300. (Erratum: doi:10.1051/0004-6361/202039657e). Gaia EDR3 record for this source at VizieR.
3. ^ VSX; Otero, S. A. (7 January 2011). "R Cancri". AAVSO Website. American Association of Variable Star Observers. Retrieved 26 Jan 2021.
4. ^ 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.
5. 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): 165–186. arXiv:astro-ph/0409579. Bibcode:2005A&A...430..165F. doi:10.1051/0004-6361:20041272. S2CID 17804304.
6. Bailer-Jones, C. A. L.; Rybizki, J.; Fouesneau, M.; Demleitner, M.; Andrae, R. (2021-03-01). "Estimating distances from parallaxes. V: Geometric and photogeometric distances to 1.47 billion stars in Gaia Early Data Release 3". The Astronomical Journal. 161 (3): 147. arXiv:2012.05220. Bibcode:2021AJ....161..147B. doi:10.3847/1538-3881/abd806. ISSN 0004-6256. Data about this star can be seen here.
7. ^ Anders, F.; Khalatyan, A.; Queiroz, A. B. A.; Chiappini, C.; Ardèvol, J.; Casamiquela, L.; Figueras, F.; Jiménez-Arranz, Ó.; Jordi, C.; Monguió, M.; Romero-Gómez, M.; Altamirano, D.; Antoja, T.; Assaad, R.; Cantat-Gaudin, T. (2022-02-01). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia EDR3 stars brighter than G = 18.5". Astronomy and Astrophysics. 658: A91. arXiv:2111.01860. Bibcode:2022A&A...658A..91A. doi:10.1051/0004-6361/202142369. ISSN 0004-6361. Database at VizieR.
8. ^ Karovicova, I.; Wittkowski, M.; Ohnaka, K.; Boboltz, D. A.; Fossat, E.; Scholz, M. (2013-12-01). "New insights into the dust formation of oxygen-rich AGB stars". Astronomy & Astrophysics. 560: A75. arXiv:1310.1924. Bibcode:2013A&A...560A..75K. doi:10.1051/0004-6361/201322376. ISSN 0004-6361.
9. Cannon, Annie J. (1907). "Second catalogue of variable stars". Annals of Harvard College Observatory. 55: 1–94. Bibcode:1907AnHar..55....1C. Retrieved 20 December 2024.
10. "The First Known Variable Stars". Students for the Exploration and Development of Space. Retrieved 1 January 2025.

v t e Constellation of Cancer
Cancer in Chinese astronomy List of stars in Cancer
Stars	Bayer α (Acubens) β (Tarf) γ (Asellus Borealis) δ (Asellus Australis) ε (Meleph) ζ (Tegmine) ζ η θ ι κ λ (Piautos) μ μ ν ξ (Nahn) ο ο π π ρ (Copernicus) ρ σ σ σ τ υ υ φ φ χ ψ ψ ω ω Flamsteed 1 3 5 7 8 11 12 15 20 (d) 21 24 25 (d) 27 28 (CX) 29 34 35 36 (c) 37 38 39 40 42 44 45 (A) 46 49 (b) 50 (A) 53 54 57 60 61 66 67 68 70 71 75 78 79 80 83 Variable R X RS VZ AZ DX EI HL HM HD 72945 72946 73534 (Gakyid) 79498 Other GJ 3470 (Kaewkosin) HIP 41378 K2-187 LHS 2090 Pr0211 WD J0914+1914 YBP 1194
Exoplanets 55 Cancri b c d e f β Cancri b GJ 3470 b HD 73534 b HIP 41378 b c d e f Pr0201 b
Star clusters Beehive Cluster Messier 67
Nebulae Abell 30 Abell 31
Galaxies	NGC 2503 2535 2536 2608 2623 2648 2775 2801 2803 2804 2812 Other 3C 191 3C 212 3C 215 DLA0817g IC 2431 OJ 287 QSO B0839+187 UGC 4457 4C +29.30 SDSS J0849+1114
Galaxy clusters Abell 671 Musket Ball Cluster
Category

This variable star–related article is a stub. You can help Misplaced Pages by expanding it.

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• Mira variables
• Cancer (constellation)
• M-type giants
• Objects with variable star designations
• Bright Star Catalogue objects
• Henry Draper Catalogue objects
• Emission-line stars
• Hipparcos objects
• Durchmusterung objects
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