Astronomy:DX Cancri
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Short description: Red dwarf star in the constellation Cancer
Coordinates: 
08h 29m 49.345s, +26° 46′ 33.74″
| Observation data Equinox J2000.0]] (ICRS) | |
|---|---|
| Constellation | Cancer |
| Right ascension | 08h 29m 49.345s[2] |
| Declination | +26° 46′ 33.74″[2] |
| Apparent magnitude (V) | 14.81[3] |
| Characteristics | |
| Spectral type | M6.5V[4] |
| Apparent magnitude (J) | 8.2[3] |
| U−B color index | +2.11[5] |
| B−V color index | +2.08[5] |
| Variable type | Flare star[3] |
| Astrometry | |
| Radial velocity (Rv) | +9.0[6] km/s |
| Proper motion (μ) | RA: −1,140[2] mas/yr Dec.: −602[2] mas/yr |
| Parallax (π) | 279.2496 ± 0.0637[7] mas |
| Distance | 11.680 ± 0.003 ly (3.5810 ± 0.0008 pc) |
| Absolute magnitude (MV) | 16.98[8] |
| Details | |
| Mass | 0.09[8] M☉ |
| Radius | 0.11[9] R☉ |
| Luminosity | 0.00065[10] L☉ |
| Temperature | 2,840[11] K |
| Rotation | 0.46 days[9] |
| Rotational velocity (v sin i) | 11.0[12] km/s |
| Age | 200[13] Myr |
| Other designations | |
G 051-015, GCTP 2016.01, GJ 1111, LHS 248[3] | |
| Database references | |
| SIMBAD | data |
  DX Location 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,[3] 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).[14] 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.
The star has a stellar classification of M6.5V,[4] identifying it as a type of main sequence star known as a red dwarf. It has about 9% of the mass of the Sun,[8] and 11% of the Sun's radius.[9] The outer envelope of the star has an effective temperature of 2,840 K,[11] making it an M-type star. It is a flare star that has random, intermittent increases in brightness by up to a factor of five. 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.[15]
See also
References
- ↑ 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. https://ui.adsabs.harvard.edu/abs/1981A&A....95..135P. Retrieved 11 November 2021.
- ↑ 2.0 2.1 2.2 2.3 Zacharias, N. (2003). "The Second U.S. Naval Observatory CCD Astrograph Catalog (UCAC2)". VizieR Online Data Catalog. CDS/ADC Collection of Electronic Catalogues, 1289, 0 (2003). Bibcode: 2003yCat.1289....0Z. http://cdsads.u-strasbg.fr/cgi-bin/nph-bib_query?2003yCat.1289....0Z&db_key=AST&nosetcookie=1. Retrieved 2010-06-29.
- ↑ 3.0 3.1 3.2 3.3 3.4 "V* DX Cnc -- Flare Star". SIMBAD. Centre de Données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=DX+Cancri.
- ↑ 4.0 4.1 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, doi:10.1086/512539, Bibcode: 2007ApJ...659.1629L
- ↑ 5.0 5.1 Weistrop, D. (August 1981). "The nature of the Giclas +4 stars". Astronomical Journal 86: 1220–1227. doi:10.1086/113001. Bibcode: 1981AJ.....86.1220W.
- ↑ 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. doi:10.1046/j.1365-8711.2001.04781.x. Bibcode: 2001MNRAS.328...45M.
- ↑ Brown, A. G. A. (2021). "Gaia Early Data Release 3: Summary of the contents and survey properties". Astronomy & Astrophysics 649: A1. doi:10.1051/0004-6361/202039657. Bibcode: 2021A&A...649A...1G. Gaia EDR3 record for this source at VizieR.
- ↑ 8.0 8.1 8.2 "The One Hundred Nearest Star Systems". RECONS. Georgia State University. January 1, 2009. http://www.chara.gsu.edu/~thenry/RECONS/TOP100.posted.htm.
- ↑ 9.0 9.1 9.2 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, doi:10.1111/j.1365-2966.2010.17101.x, Bibcode: 2010MNRAS.407.2269M
- ↑ Vidotto, A. A. (July 2013). "Effects of M dwarf magnetic fields on potentially habitable planets". Astronomy & Astrophysics 557: A67. doi:10.1051/0004-6361/201321504. Bibcode: 2013A&A...557A..67V.
- ↑ 11.0 11.1 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. doi:10.1086/510304. Bibcode: 2007ApJ...656.1121R.
- ↑ Jenkins, J. S. (October 2009). "Rotational Velocities for M Dwarfs". The Astrophysical Journal 704 (2): 975–988. doi:10.1088/0004-637X/704/2/975. Bibcode: 2009ApJ...704..975J.
- ↑ Lestrade, J.-F. et al. (November 2009), "Search for cold debris disks around M-dwarfs. II", Astronomy and Astrophysics 506 (3): 1455–1467, doi:10.1051/0004-6361/200912306, Bibcode: 2009A&A...506.1455L
- ↑ 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, https://books.google.com/books?id=4zjv84hHNPcC&pg=PA9
- ↑ Lestrade, J.-F. et al. (December 2006), "Search for cold debris disks around M-dwarfs", Astronomy and Astrophysics 460 (3): 733–741, doi:10.1051/0004-6361:20065873, Bibcode: 2006A&A...460..733L
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. doi:10.1088/0004-637X/784/2/156. Bibcode: 2014ApJ...784..156D. Table with parallaxes.
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