CL Draconis

CL Draconis
CL Draconis (circled), with the obsolete constellation Quadrans Muralis in the background.
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension 15h 57m 47.44180s[1]
Declination +54° 44′ 59.1428″[1]
Apparent magnitude (V) 4.96[2]
Characteristics
Spectral type F0 IV[3]
B−V color index 0.269±0.008[2]
Variable type δ Sct[4]
Astrometry
Radial velocity (Rv)−11.0±4.2[5] km/s
Proper motion (μ) RA: −151.643[1] mas/yr
Dec.: +107.519[1] mas/yr
Parallax (π)29.9305 ± 0.1368 mas[1]
Distance109.0 ± 0.5 ly
(33.4 ± 0.2 pc)
Absolute magnitude (MV)2.33[2]
Details
Mass1.68±0.01[6] M☉
Luminosity10.2+0.2
−0.3[6] L☉
Surface gravity (log g)4.04±0.14[7] cgs
Temperature7,439±253[7] K
Metallicity [Fe/H]0.04±0.10[8] dex
Rotational velocity (v sin i)165[6] km/s
Age643[7] Myr
Other designations
CL Dra, AG+54° 1023, BD+55° 1793, FK5 595, HD 143466, HIP 78180, HR 5960, SAO 29727[9]
Database references
SIMBADdata

CL Draconis is a single[10] star in the northern circumpolar constellation of Draco. It can be viewed with the naked eye, having an apparent visual magnitude of 4.96.[2] The distance to this star, as determined from its annual parallax shift of 29.9 mas,[1] is 109 light years. It is moving closer to the Earth with a heliocentric radial velocity of −11 km/s.[5] The star has a relatively high proper motion, traversing the celestial sphere at the rate of 0.185″/yr.[11]

Based upon a stellar classification of F0 IV,[3] this is an aging F-type subgiant star that has consumed the hydrogen at its core. It is spinning rapidly with a projected rotational velocity of 165 km/s,[6] giving it an oblate shape with an equatorial bulge that is estimated to be 8% larger than the polar radius.[12]

caption=Visual band light curves for CL Draconis, adapted from DuPuy and Burgoyne (1983)[13]

CL Draconis is a Delta Scuti variable, changing brightness with an amplitude of 0.010 magnitude over a period of 1.83 hours.[14] CL Dra has 1.68[6] times the mass of the Sun and is radiating 10.2[6] times the Sun's luminosity from its photosphere at an effective temperature of 7,439 K.[7]

It was transferred from Draco to Quadrans Muralis. Later when the International Astronomical Union officially recognised constellations, Quadrans Muralis became obsolete, so this star was moved back to Draco.

  1. ^ a b c d e f Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Cowley1969 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference gcvs was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference deBruijne2012 was invoked but never defined (see the help page).
  6. ^ a b c d e f Cite error: The named reference zorec2012 was invoked but never defined (see the help page).
  7. ^ a b c d Cite error: The named reference David2015 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Gaspar2016 was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Lepine2005 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference vanBelle2012 was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference DuPuy was invoked but never defined (see the help page).
  14. ^ Cite error: The named reference Rodríguez2000 was invoked but never defined (see the help page).