HD 186756

HD 186756
Location of HD 186756 (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 19h 48m 55.08814s[1]
Declination −52° 53′ 17.1953″[1]
Apparent magnitude (V) 6.25[2]
Characteristics
Spectral type K1 III[3]
U−B color index +1.12[2]
B−V color index +1.13[2]
Astrometry
Radial velocity (Rv)−21.2±0.4[4] km/s
Proper motion (μ) RA: +14.802 mas/yr[1]
Dec.: −48.522 mas/yr[1]
Parallax (π)4.3872 ± 0.0275 mas[1]
Distance743 ± 5 ly
(228 ± 1 pc)
Absolute magnitude (MV)−0.96[5]
Details
Mass1.23[6] M☉
Radius21.01±1.07[7] R☉
Luminosity177±2[8] L☉
Surface gravity (log g)1.83[6] cgs
Temperature4,747±122[9] K
Metallicity [Fe/H]−0.13[6] dex
Rotational velocity (v sin i)<1[10] km/s
Other designations
68 G. Telescopii[11], CD−53°8294, CPD−53°9678, FK5 3581, GC 27384, HD 186756, HIP 97491, HR 7521, SAO 246277[12]
Database references
SIMBADdata

HD 186756, also known as HR 7521 or rarely 68 G. Telescopii, is a solitary orange hued star located in the southern constellation Telescopium. It has an apparent magnitude of 6.25,[2] placing it near the limit for naked eye visibility, even under ideal conditions. Gaia DR3 parallax measurements imply a distance of 743 light years;[1] it is currently approaching with a heliocentric radial velocity of −21.2 km/s.[4] At its current distance, HD 186756's brightness is diminished by 0.34 magnitudes due to extinction from interstellar dust[13] and it has an absolute magnitude of −0.96.[5]

This is an evolved red giant star with a stellar classification of K1 III. It has 123% the mass of the Sun[6] but it has expanded to 21.01 times the radius of the Sun.[7] The object radiates 177 times the luminosity of the Sun[8] from its enlarged photosphere at an effective temperature of 4,747 K.[9] HD 186756 is slightly metal deficient with an iron abundance of [Fe/H] = −0.13 (74% solar) and it spins too slowly for its projected rotational velocity to be measured accurately.[10]

  1. ^ a b c d e Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b c d Cite error: The named reference Oja1970 was invoked but never defined (see the help page).
  3. ^ Cite error: The named reference Houk1978 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  6. ^ a b c d Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Kervella2004 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference GaiaDR2 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  10. ^ a b Cite error: The named reference De Medeiros2014 was invoked but never defined (see the help page).
  11. ^ Cite error: The named reference Gould1879 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 Gontcharov2017 was invoked but never defined (see the help page).