HD 186756

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]

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]
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
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
SIMBAD	data

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]