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HD 166006

HD 166006
Observation data
Epoch J2000      Equinox J2000
Constellation Telescopium
Right ascension 18h 11m 04.40s[1]
Declination −47° 30′ 47.24″[1]
Apparent magnitude (V) 6.07±0.01[2]
Characteristics
Spectral type K1 III CN2[3]
B−V color index +1.20[4]
Astrometry
Radial velocity (Rv)−14.9±2.9[5] km/s
Proper motion (μ) RA: −3.69±0.39 mas/yr[6]
Dec.: −29.50±0.23 mas/yr[6]
Parallax (π)5.6048 ± 0.0652 mas[1]
Distance582 ± 7 ly
(178 ± 2 pc)
Absolute magnitude (MV)−0.12[7]
Details
Mass1.24[8] M☉
Radius20.1[9] R☉
Luminosity165[7] L☉
Surface gravity (log g)1.89[8] cgs
Temperature4,529±93[10] K
Metallicity [Fe/H]−0.07[8] dex
Rotational velocity (v sin i)<1[11] km/s
Other designations
CD−47 12098, HD 166006, HIP 89096, HR 6778, WDS J18111-4731A[12]
Database references
SIMBADdata

HD 166006, also known as HR 6778, is a solitary orange-hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.07, making it barely visible to the naked eye. Based on Gaia DR2 parallax measurements, the object is located 582 light years away. It is currently approaching the Solar System with a somewhat constrained heliocentric radial velocity of −15 km/s.

HD 166006 has a stellar classification of K1 III CN2,[3] which indicates that it is an evolved red giant with a strong overabundance of cyano radicals in its spectrum, making it a CN star. At the estimated distance of HD 166006, the star has an angular diameter of 1.05 mas.[10] This yields a radius of 20.1 R☉.[9] It has 1.24 times the mass of the Sun[8] and radiates 165 times the luminosity of the Sun[7] from its enlarged photosphere at an effective temperature of 4,529 K.[10] The star is slightly metal deficient ([Fe/H] = −0.07[8]) and spins a little too slowly to be accurately measured.[11]HD 166006 has an optical 11th magnitude companion located 1.8" away along a position angle of 271° as of 2015.[13]

  1. ^ a b c Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  2. ^ Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  4. ^ Cite error: The named reference Johnson1966 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference VanLeeuwen2007 was invoked but never defined (see the help page).
  7. ^ a b c Cite error: The named reference XHIP was invoked but never defined (see the help page).
  8. ^ a b c d e Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Lang2006 was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference Stevens2017 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference DeMederios2014 was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Simbad was invoked but never defined (see the help page).
  13. ^ Cite error: The named reference Mason2001 was invoked but never defined (see the help page).

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