Epsilon Telescopii
Star in the constellation Telescopus
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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.
 | |
| 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]