10 Draconis

Star in the constellation Draco i Draconis ι Draconis Draco constellation map.svg center 280 right Red circle.svg 10 10 Draconis 850 600 Location of 10 Draconis (circled in red) J2000 Draco 13 51 25.90451 +64 43 23.7510 4.52 - 4.67 AGB M3.5 III 1.572 0.010 LB: −12.26 0.17 +14.144 +3.172 8.2082 0.2628 −0.70 0.93 0.06 83.22 2.08 2.16 1031 70 commas 1.00 3584 35 commas −0.24 10.24 1.40 i Dra 10 Dra CU Dra +65°963 511 121130 67627 5226 16199 10+Dra 10 Draconis is a single star in the northern circumpolar constellation of Draco. It was a latter designation of 87 Ursae Majoris, and is visible to the naked eye with an apparent visual magnitude of about 4.6. The distance to this star, as determined from its annual parallax shift of 8.2 mas, is around 400 light years. It is moving closer with a heliocentric radial velocity of −12 km/s, and is expected to come to within 25.82 pc ly 2 on out in about 8.6 million years. thumb|left|A light curve for CU Draconis, plotted from Hipparcos data Estimated to be around 10 billion years old, this is an aging red giant star with a stellar classification of M3.5 III. It is a periodic variable with a frequency of 11.98912 cycles per day and an amplitude of 0.0254 in magnitude. The spectrum does not show evidence of s-process enhancement. 10 Dra has 93% of the mass of the Sun but has expanded to about 83 times the Sun's radius. The star is radiating over 1,000 times the Sun's luminosity from its enlarged photosphere at an effective temperature of 3,584 K. References Hipparcos Tools Interactive Data Access https://www.cosmos.esa.int/web/hipparcos/interactive-data-access Hipparcos ESA 8 December 2021 HD 40409 2018-07-16 GCVS Query=CU Dra General Catalogue of Variable Stars @ Sternberg Astronomical Institute, Moscow, Russia http://www.sai.msu.su/gcvs/cgi-bin/search.cgi?search=CU+Dra 2023-04-19 Koen Chris Eyer Laurent New periodic variables from the Hipparcos epoch photometry Monthly Notices of the Royal Astronomical Society 331 1 45–59 March 2002 10.1046/j.1365-8711.2002.05150.x free 2002MNRAS.331...45K astro-ph/0112194 10505995 67627 Wagman M. Flamsteed's Missing Stars Journal for the History of Astronomy 18 223 August 1987 3 1987JHA....18..209W 10.1177/002182868701800305 118445625 The Perkins catalog of revised MK types for the cooler stars Astrophysical Journal Supplement Series 71 245 1989 Keenan Philip C. McNeil Raymond C. 1989ApJS...71..245K 10.1086/191373 Fundamental Parameters of 87 Stars from the Navy Precision Optical Interferometer Baines E. Schmitt H. R. Zavala R. T. Hutter D. van Belle G. T. The Astronomical Journal 155 1 December 2017 30 2018AJ....155...30B 10.3847/1538-3881/aa9d8b 1712.08109 119427037 free A catalogue of multiplicity among bright stellar systems Eggleton P. P. Tokovinin A. A. Monthly Notices of the Royal Astronomical Society 389 2 869 2008 10.1111/j.1365-2966.2008.13596.x free 2008MNRAS.389..869E 0806.2878 14878976 S stars without technetium - The binary star connection Brown Jeffery A. Smith Verne V. Lambert David L. Dutchover Edward Jr. Hinkle Kenneth H. Johnson Hollis R. Astronomical Journal 1 99 June 1990 1930–1940 10.1086/115475 1990AJ.....99.1930B 1992AJ....104..275E Asymptotic Giant Branch Stars Near the Sun Eggen Olin J. The Astronomical Journal 1992 104 275 10.1086/116239 Category:M-type giants Category:Slow irregular variables Category:Draco (constellation) Draconis, i BD+65 0963 Draconis, 10 121130 067627 5226 Draconis, CU Category:Asymptotic-giant-branch stars