DX Cancri

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DX Cancri
Observation data
Epoch J2000      Equinox J2000
Constellation Cancer
Right ascension 08h 29m 49.345s[1]
Declination +26° 46′ 33.74″[1]
Apparent magnitude (V) 14.81[2]
Spectral type M6.5V[3]
Apparent magnitude (J) 8.2[2]
U−B color index +2.11[4]
B−V color index +2.08[4]
Variable type Flare star[2]
Radial velocity (Rv) +9.0[5] km/s
Proper motion (μ) RA: –1140[1] mas/yr
Dec.: –602[1] mas/yr
Parallax (π) 275.80 ± 3.00[6] mas
Distance 11.8 ± 0.1 ly
(3.63 ± 0.04 pc)
Absolute magnitude (MV) 16.98[7]
Mass 0.09[7] M
Radius 0.11[8] R
Luminosity 0.00065[9] L
Temperature 2,840[10] K
Rotation 0.46 days[8]
Rotational velocity (v sin i) 11.0[11] km/s
Age 200[12] Myr
Other designations
G 051-015, GCTP 2016.01, GJ 1111, LHS 248.[2]
Database references

DX Cancri is the variable star identifier for a small star in the northern zodiac constellation of Cancer the crab. With an apparent visual magnitude of 14.81,[2] 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).[13] 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.

This star has a stellar classification of M6.5V,[3] identifying it as a type of main sequence star known as a red dwarf. It has about 9%[7] of the mass of the Sun and 11%[8] of the Sun's radius. The outer envelope of the star has an effective temperature of 2,840 K,[10] giving it the cool red-orange glow of an M-type star. This is a flare star that has random, intermittent changes in brightness by up to a fivefold increase.

This star has been examined for excess emission of infrared radiation caused by cold circumstellar dust, but none was found.[12] 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.[14]


DX Cancri distance estimates

Source Parallax, mas Distance, pc Distance, ly Distance, Pm Ref.
Gliese & Jahreiß (1991) 275.8±3.0 3.63±0.04 11.83±0.13 111.9±1.2 [15]
van Altena et al. (1995) 275.8±3.0[note 1] 3.63±0.04 11.83±0.13 111.9±1.2 [16]
RECONS TOP100 (2012) 275.8±3.0[note 2] 3.63±0.04 11.83±0.13 111.9±1.2 [17]
Dittmann et al. (2014) 275.30±4.10 3.63±0.05 11.85+0.18

Non-trigonometric distance estimates are marked in italic. The most precise estimate is marked in bold.

See also[edit]


  1. ^ a b c d Zacharias, N. et al. (2003). The Second U.S. Naval Observatory CCD Astrograph Catalog (UCAC2). CDS/ADC Collection of Electronic Catalogues, 1289, 0 (2003). Retrieved 2010-06-29. 
  2. ^ a b c d e "V* DX Cnc -- Flare Star". SIMBAD. Centre de Données astronomiques de Strasbourg. Retrieved 2010-06-29. 
  3. ^ a b Luhman, K. L. et al. (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. 
  4. ^ a b Weistrop, D. (August 1981). "The nature of the Giclas +4 stars". Astronomical Journal 86: 1220–1227. Bibcode:1981AJ.....86.1220W. doi:10.1086/113001. 
  5. ^ 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. 
  6. ^ van Altena, W. F.; Lee, J. T.; Hoffleit, E. D. (1995). The general catalogue of trigonometric [stellar] parallaxes (4th ed.). New Haven, CT: Yale University Observatory. Retrieved 2010-06-29. 
  7. ^ a b c "The One Hundred Nearest Star Systems". RECONS. Georgia State University. January 1, 2009. Retrieved 2010-06-29. 
  8. ^ a b c 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 
  9. ^ Vidotto, A. A. et al. (July 2013). "Effects of M dwarf magnetic fields on potentially habitable planets". Astronomy & Astrophysics. arXiv:1306.4789. doi:10.1051/0004-6361/201321504. 
  10. ^ a b Reiners, A.; Basri, G. (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. 
  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. 
  12. ^ a b 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 
  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 
  15. ^ Gliese, W. and Jahreiß, H. (1991). "GJ 1111". Preliminary Version of the Third Catalogue of Nearby Stars. Retrieved 2014-10-20. 
  16. ^ Van Altena W. F., Lee J. T., Hoffleit E. D. (1995). "GCTP 2016.01". The General Catalogue of Trigonometric Stellar Parallaxes (Fourth ed.). Retrieved 2014-10-20. 
  17. ^ "RECONS TOP100". THE ONE HUNDRED NEAREST STAR SYSTEMS brought to you by RECONS (Research Consortium On Nearby Stars). 2012. Retrieved 2014-10-20. 
  18. ^ 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.  Table with parallaxes.


  1. ^ Coincides with parallax from Gliese & Jahreiß (1991).
  2. ^ Parallax from van Altena et al. (1995).

External links[edit]