Rho Draconis

Rho Draconis
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Draco
Right ascension 20h 02m 49.07268s[1]
Declination +67° 52′ 24.8294″[1]
Apparent magnitude (V) 4.52[2]
Characteristics
Spectral type K3 III[3]
U−B color index +1.54[2]
B−V color index +1.34[2]
Astrometry
Radial velocity (Rv)−9.80±0.43[4] km/s
Proper motion (μ) RA: +16.44[1] mas/yr
Dec.: +47.31[1] mas/yr
Parallax (π)7.61 ± 0.17 mas[1]
Distance429 ± 10 ly
(131 ± 3 pc)
Absolute magnitude (MV)−0.97[5]
Details
Radius28[3] R☉
Luminosity402[6] L☉
Surface gravity (log g)1.90[7] cgs
Temperature4370[7] K
Metallicity [Fe/H]0.03[7] dex
Rotational velocity (v sin i)10[8] km/s
Other designations
ρ Dra, 67 Dra, BD+67° 1222, HD 190940, HIP 98702, HR 7685, SAO 18676[9]
Database references
SIMBADdata

Rho Draconis (ρ Draconis) is a solitary[10] star in the northern circumpolar constellation of Draco. It is faintly visible to the naked eye with an apparent visual magnitude of 4.52.[2] Based upon an annual parallax shift of 7.61 mas as measured from Earth,[1] it is located around 429 light years from the Sun. At that distance, the visual magnitude of the star is diminished by an extinction factor of 0.027 due to interstellar dust.[5]

With a stellar classification of K3 III,[3] Rho Draconis is a normal giant star that is past the first dredge-up phase of its post-main sequence evolution.[7] It has the peculiar spectrum of a CN star, showing abnormal line strengths for cyanogen and calcium.[11] The star has expanded to around 28[3] times the Sun's radius and it is radiating 402[6] times the solar luminosity from its photosphere at an effective temperature of 4,370 K.[7]

  1. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Argue1966 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference PasinettiFracassini2001 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Famaey2005 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Ryon2009 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference mcdonald2012 was invoked but never defined (see the help page).
  7. ^ a b c d e Cite error: The named reference Mishenina1995 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Bernacca1970 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 Mishenina1997 was invoked but never defined (see the help page).