68 Draconis

68 Draconis
Observation data
Epoch J2000      Equinox J2000
Constellation Draco
Right ascension 20h 11m 34.872s[1]
Declination +62° 04′ 42.77″[1]
Apparent magnitude (V) 5.69[2]
Characteristics
Spectral type F5 V[2]
B−V color index 0.48[3]
Astrometry
Radial velocity (Rv)–14.6[4] km/s
Proper motion (μ) RA: +142.267 mas/yr[1]
Dec.: +72.842 mas/yr[1]
Parallax (π)20.9232 ± 0.065 mas[1]
Distance155.9 ± 0.5 ly
(47.8 ± 0.1 pc)
Absolute magnitude (MV)2.33[5]
Details
Mass1.15[6] M☉
Luminosity10.73[7] L☉
Surface gravity (log g)3.95[3] cgs
Temperature6,137[3] K
Metallicity [Fe/H]0.20[5] dex
Rotational velocity (v sin i)15.1[3] km/s
Age1.7[5] Gyr
Other designations
68 Dra, BD+61° 1983, HD 192455, HIP 99500, HR 7727, SAO 18751[8]
Database references
SIMBADdata

68 Draconis is the Flamsteed designation for a star in the northern circumpolar constellation of Draco. It has an apparent visual magnitude of 5.69,[2] so, according to the Bortle scale, it is faintly visible to the naked eye from suburban skies at night. Measurements made with the Gaia spacecraft show an annual parallax shift of 0.0209232″,[1] which is equivalent to a distance of around 156 ly (48 pc) from the Sun. It is moving closer to the Earth with a heliocentric radial velocity of –14.6 km/s.[4] The star has a relatively high proper motion, traversing the celestial sphere at a rate of 0.150″ per year.[9]

The stellar classification of 68 Draconis is F5 V,[2] indicating that it is a main sequence star that is fusing hydrogen into helium at its core to generate energy. The star appears to be over-luminous for a member of its class, being 0.73 magnitudes brighter than expected. This may indicate that this is a binary system with an unresolved secondary component.[2] It has 15%[6] more mass than the Sun but is less than half as old, with an estimated age of 1.7 billion years.[5] The star is radiating 11[7] times the Sun's luminosity from its photosphere at an effective temperature of 6,137 K,[3] giving it the yellow-white hue of an F-type star.[10]

  1. ^ a b c d e Cite error: The named reference GaiaEDR3 was invoked but never defined (see the help page).
  2. ^ a b c d e Cite error: The named reference apjss147_1_103 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference aaa493_3_1099 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Nordström2004 was invoked but never defined (see the help page).
  5. ^ a b c d Cite error: The named reference Holmberg2009 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference David2015 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  9. ^ Cite error: The named reference Lepine2005 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference csiro was invoked but never defined (see the help page).