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] |
Distance | 743 ± 5 ly (228 ± 1 pc) |
Absolute magnitude (MV) | −0.96[5] |
Details | |
Mass | 1.23[6] M☉ |
Radius | 21.01±1.07[7] R☉ |
Luminosity | 177±2[8] L☉ |
Surface gravity (log g) | 1.83[6] cgs |
Temperature | 4,747±122[9] K |
Metallicity [Fe/H] | −0.13[6] dex |
Rotational velocity (v sin i) | <1[10] km/s |
Other designations | |
Database references | |
SIMBAD | data |
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]
GaiaDR3
was invoked but never defined (see the help page).Oja1970
was invoked but never defined (see the help page).Houk1978
was invoked but never defined (see the help page).Gontcharov2006
was invoked but never defined (see the help page).Anderson2012
was invoked but never defined (see the help page).Anders2019
was invoked but never defined (see the help page).Kervella2004
was invoked but never defined (see the help page).GaiaDR2
was invoked but never defined (see the help page).Stassun2019
was invoked but never defined (see the help page).De Medeiros2014
was invoked but never defined (see the help page).Gould1879
was invoked but never defined (see the help page).SIMBAD
was invoked but never defined (see the help page).Gontcharov2017
was invoked but never defined (see the help page).