Zeta Telescopii

Zeta Telescopii (ζ Telescopii) is the second-brightest star in the southern constellation of Telescopium. It is a solitary,^[7] orange-hued star that is visible to the naked eye with an apparent visual magnitude of +4.13.^[2] Based upon an annual parallax shift of 26.7 mas as seen from Earth,^[1] it is located around 122 light years from the Sun.

Zeta Telescopii

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Telescopium
Right ascension	18h 28m 49.85937s[1]
Declination	−49° 04′ 14.1180″[1]
Apparent magnitude (V)	+4.13[2]
Characteristics
Evolutionary stage	red clump[2]
Spectral type	K1 III-IV[3]
U−B color index	+0.82[4]
B−V color index	+1.02[4]
Astrometry
Radial velocity (Rv)	−29.75±0.19[1] km/s
Proper motion (μ)	RA: +139.344 mas/yr[1] Dec.: −229.844 mas/yr[1]
Parallax (π)	26.6984±0.1406 mas[1]
Distance	122.2 ± 0.6 ly (37.5 ± 0.2 pc)
Absolute magnitude (MV)	1.27±0.03[5]
Details[5]
Mass	1.41±0.07 M☉
Radius	8.27±0.15 R☉
Luminosity	33.30±0.85 L☉
Surface gravity (log g)	2.84±0.077 cgs
Temperature	4,824±31 K
Metallicity [Fe/H]	−0.126±0.022 dex
Other designations
ζ Tel, CD−49°12153, HD 169767, HIP 90568, HR 6905, SAO 229047[6]
Database references
SIMBAD	data

This is a red clump^[2] giant star of spectral type K1 III-IV.^[3] It is just 40% more massive than the Sun, but has a radius eight times larger and shines with about 30 times its luminosity. The surface of Zeta Telescopii has an effective temperature of 4,824 K,^[8] giving it the orange hue typical of K-type stars.^[9]