Epsilon Telescopii

Epsilon Telescopii, Latinized from ε Telescopii, is a solitary,^[10] orange-hued star in the southern constellation of Telescopium. It is visible to the naked eye with an apparent visual magnitude of +4.53.^[4] Based upon an annual parallax shift of 7.80 mas as seen from Earth,^[1] it is located roughly 410 light years from the Sun, give or take 20 light years.

ε Telescopii

Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Telescopium
Right ascension	18h 11m 13.7612s[1]
Declination	−45° 57′ 15.882″[1]
Apparent magnitude (V)	4.50±0.01[2]
Characteristics
Evolutionary stage	red giant branch[1]
Spectral type	K0 III[3]
U−B color index	+0.78[4]
B−V color index	+1.01[4]
Astrometry
Radial velocity (Rv)	−26.3±0.8[5] km/s
Proper motion (μ)	RA: −18.837 mas/yr[1] Dec.: −38.102 mas/yr[1]
Parallax (π)	8.0405±0.321 mas[1]
Distance	410 ± 20 ly (124 ± 5 pc)
Absolute magnitude (MV)	−1.00[6]
Details
Mass	3.9[1] M☉
Radius	20[1] R☉
Luminosity	256[1] L☉
Surface gravity (log g)	2.32±0.12[7] cgs
Temperature	4,996±42[7] K
Metallicity [Fe/H]	−0.07±0.04[7] dex
Rotational velocity (v sin i)	6.1[8] km/s
Other designations
ε Tel, CD−45°12251, FK5 1473, HD 166063, HIP 89112, HR 6783, SAO 228777[9]
Database references
SIMBAD	data

This an evolved K-type giant with a stellar classification of K0 III.^[3] It displays an infrared excess, suggesting the presence of an orbiting disk of dust.^[11] The star is radiating 293^[12] times the Sun's luminosity from its photosphere at an effective temperature of 4,996 K.^[7] It has a 13th magnitude optical companion at an angular separation of 16.30 arcseconds along a position angle of 233°, as of 2000.^[13]