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DX Cancri

An ultraviolet band light curve for a flare on DX Cancri, adapted from Pettersen (1981)
Observation data Epoch J2000      Equinox J2000
Constellation	Cancer
Right ascension	08 29 49.35279
Declination	+26° 46′ 33.6241″
Apparent magnitude (V)	14.81
Characteristics
Spectral type	M6.5V
Apparent magnitude (J)	8.2
U−B color index	+2.11
B−V color index	+2.08
Variable type	Flare star
Astrometry
Radial velocity (Rv)	+9.0 km/s
Proper motion (μ)	RA: −1,113.694 mas/yr Dec.: −612.191 mas/yr
Parallax (π)	279.2496 ± 0.0637 mas
Distance	11.680 ± 0.003 ly (3.5810 ± 0.0008 pc)
Absolute magnitude (MV)	16.98
Details
Mass	0.106±0.009 M☉
Radius	0.1235±0.0006 R☉
Luminosity	0.00073±0.000007 L☉
Surface gravity (log g)	~5 cgs
Temperature	2,840 K
Rotation	0.46 days
Rotational velocity (v sin i)	11.0 km/s
Age	200 Myr
Other designations
G 051-015, GCTP 2016.01, GJ 1111, LHS 248
Database references
SIMBAD	data
DXLocation of DX Cancri in the constellation Cancer

DX Cancri is a variable star in the northern zodiac constellation of Cancer. With an apparent visual magnitude of 14.81, it is much too faint to be seen with the naked eye. Visually viewing this star requires a telescope with a minimum aperture of 16 in (41 cm). Based upon parallax measurements, DX Cancri is located at a distance of 11.8 light-years (3.6 parsecs) from Earth. This makes it the 18th closest star (or star system) to the Sun. It is a proposed member of the Castor Moving Group of stars that share a common trajectory through space. This group has an estimated age of 200 million years.

In 1981, Bjørn Ragnvald Pettersen discovered that the star, then called G 51-15, is a variable star. It was given its variable star designation, DX Cancri, in 1985. It is a flare star that has unpredictable, intermittent increases in brightness by up to a factor of five.

The star has a stellar classification of M6.5V, identifying it as a type of main sequence star known as a red dwarf. It has about 10% of the mass of the Sun, and 12% of the Sun's radius. The outer envelope of the star has an effective temperature of 2,840 K, making it an M-type star.

See also

• List of nearest stars

References

1. Pettersen, B. R. (February 1981). "Discovery of flare activity on the very low luminosity red dwarf G 51-15". Astronomy & Astrophysics. 95: 135–137. Bibcode:1981A&A....95..135P. Retrieved 11 November 2021.
2. ^ Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv:2208.00211. Bibcode:2023A&A...674A...1G. doi:10.1051/0004-6361/202243940. S2CID 244398875. Gaia DR3 record for this source at VizieR.
3. ^ "V* DX Cnc -- Flare Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-06-29.
4. ^ Luhman, Kevin L.; Allers, Katelyn N.; Jaffe, Daniel T.; Cushing, Michael C.; Williams, Kurtis A.; Slesnick, Catherine L.; Vacca, William D. (April 2007), "Ophiuchus 1622-2405: Not a Planetary-Mass Binary", The Astrophysical Journal, 659 (2): 1629–1636, arXiv:astro-ph/0701242, Bibcode:2007ApJ...659.1629L, doi:10.1086/512539, S2CID 11153196
5. ^ Weistrop, D. (August 1981). "The nature of the Giclas +4 stars". Astronomical Journal. 86: 1220–1227. Bibcode:1981AJ.....86.1220W. doi:10.1086/113001.
6. Montes, D.; et al. (November 2001). "Late-type members of young stellar kinematic groups - I. Single stars". Monthly Notices of the Royal Astronomical Society. 328 (1): 45–63. arXiv:astro-ph/0106537. Bibcode:2001MNRAS.328...45M. doi:10.1046/j.1365-8711.2001.04781.x. S2CID 55727428.
7. "The One Hundred Nearest Star Systems". RECONS. Georgia State University. January 1, 2009. Retrieved 2010-06-29.
8. ^ Cifuentes, C.; Caballero, J. A.; Cortés-Contreras, M.; Montes, D.; Abellán, F. J.; Dorda, R.; Holgado, G.; Zapatero Osorio, M. R.; Morales, J. C.; Amado, P. J.; Passegger, V. M.; Quirrenbach, A.; Reiners, A.; Ribas, I.; Sanz-Forcada, J. (2020-10-01), "CARMENES input catalogue of M dwarfs. V. Luminosities, colours, and spectral energy distributions", Astronomy and Astrophysics, 642: A115, arXiv:2007.15077, Bibcode:2020A&A...642A.115C, doi:10.1051/0004-6361/202038295, ISSN 0004-6361
9. ^ Reiners, Ansgar; Basri, Gibor (February 2007). "The First Direct Measurements of Surface Magnetic Fields on Very Low Mass Stars". The Astrophysical Journal. 656 (2): 1121–1135. arXiv:astro-ph/0610365. Bibcode:2007ApJ...656.1121R. doi:10.1086/510304. S2CID 17743657.
10. Morin, J.; et al. (October 2010), "Large-scale magnetic topologies of late M dwarfs", Monthly Notices of the Royal Astronomical Society, 407 (4): 2269–2286, arXiv:1005.5552, Bibcode:2010MNRAS.407.2269M, doi:10.1111/j.1365-2966.2010.17101.x, S2CID 119192200
11. Jenkins, J. S.; et al. (October 2009). "Rotational Velocities for M Dwarfs". The Astrophysical Journal. 704 (2): 975–988. arXiv:0908.4092. Bibcode:2009ApJ...704..975J. doi:10.1088/0004-637X/704/2/975. S2CID 119203469.
12. Lestrade, J.-F.; et al. (November 2009), "Search for cold debris disks around M-dwarfs. II", Astronomy and Astrophysics, 506 (3): 1455–1467, arXiv:0907.4782, Bibcode:2009A&A...506.1455L, doi:10.1051/0004-6361/200912306, S2CID 17035185
13. Sherrod, P. Clay; Koed, Thomas L. (2003), A Complete Manual of Amateur Astronomy: Tools and Techniques for Astronomical Observations, Astronomy Series, Courier Dover Publications, p. 9, ISBN 0486428206
14. Lestrade, J.-F.; et al. (December 2006), "Search for cold debris disks around M-dwarfs", Astronomy and Astrophysics, 460 (3): 733–741, arXiv:astro-ph/0609574, Bibcode:2006A&A...460..733L, doi:10.1051/0004-6361:20065873, S2CID 119328045
15. Pettersen, B. R. (February 1981). "Discovery of flare activity on the very low luminosity red dwarf G 51-15". Astronomy and Astrophysics. 95: 135–137. Bibcode:1981A&A....95..135P. Retrieved 31 December 2024.
16. Kholopov, P. N.; Samus, N. N.; Kazarovets, E. V.; Perova, N. B. (March 1985). "The 67th Name-List of Variable Stars" (PDF). Information Bulletin on Variable Stars. 2681: 1–32. Bibcode:1985IBVS.2681....1K. Retrieved 31 December 2024.

Further reading

• Dittmann, Jason A.; Irwin, Jonathan M.; Charbonneau, David; Berta-Thompson, Zachory K. (2014). "Trigonometric Parallaxes for 1507 Nearby Mid-to-late M Dwarfs". The Astrophysical Journal. 784 (2): 156. arXiv:1312.3241. Bibcode:2014ApJ...784..156D. doi:10.1088/0004-637X/784/2/156. S2CID 18789867. Table with parallaxes.

External links

• SolStation entry
• ARICNS

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

• M-type main-sequence stars
• Flare stars
• Local Bubble
• Cancer (constellation)
• Gliese and GJ objects
• Objects with variable star designations