10 Draconis

This article is about i Draconis. Not to be confused with ι Draconis.
10 Draconis

A light curve for CU Draconis, plotted from Hipparcos data[1]
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension 13h 51m 25.90451s[2]
Declination +64° 43′ 23.7510″[2]
Apparent magnitude (V) 4.52 - 4.67[3]
Characteristics
Spectral type M3.5 III[4]
B−V color index 1.572±0.010[5]
Variable type LB:[3]
Astrometry
Radial velocity (Rv)−12.26±0.17[5] km/s
Proper motion (μ) RA: +14.144[2] mas/yr
Dec.: +3.172[2] mas/yr
Parallax (π)8.2082 ± 0.2628 mas[2]
Distance400 ± 10 ly
(122 ± 4 pc)
Absolute magnitude (MV)−0.70[5]
Details[6]
Mass0.93±0.06 M☉
Radius83.22+2.08
−2.16 R☉
Luminosity1,031±70 L☉
Surface gravity (log g)1.00 cgs
Temperature3,584±35 K
Metallicity [Fe/H]−0.24 dex
Age10.24±1.40 Gyr
Other designations
i Dra, 10 Dra, CU Dra, BD+65°963, FK5 511, HD 121130, HIP 67627, HR 5226, SAO 16199[7]
Database references
SIMBADdata

10 Draconis is a single[8] star in the northern circumpolar constellation of Draco. It was a latter designation of 87 Ursae Majoris,[9] and is visible to the naked eye with an apparent visual magnitude of about 4.6.[3] The distance to this star, as determined from its annual parallax shift of 8.2 mas,[2] 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 84 ly in about 8.6 million years.[5]

Estimated to be around 10 billion years old, this is an aging red giant star with a stellar classification of M3.5 III.[4] It is a periodic variable with a frequency of 11.98912 cycles per day and an amplitude of 0.0254 in magnitude.[10] The spectrum does not show evidence of s-process enhancement.[11] 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.[6]

  1. ^ Cite error: The named reference HipDataAccess was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference GCVS-CU-Dra was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference perkins1989 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Baines2017 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Wagman1987 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Koen2002 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Brown1990 was invoked but never defined (see the help page).