Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
---|---|
Constellation | Telescopium |
Right ascension | 18h 32m 01.94437s[1] |
Declination | −45° 45′ 26.5636″[1] |
Apparent magnitude (V) | 5.05[2] |
Characteristics | |
Spectral type | B3 IV/V[3] or B3 III[4] |
U−B color index | −0.52[2] |
B−V color index | −0.12[2] |
Astrometry | |
Proper motion (μ) | RA: +0.16[1] mas/yr Dec.: −10.23[1] mas/yr |
Parallax (π) | 2.73 ± 0.26 mas[1] |
Distance | 1,200 ± 100 ly (370 ± 30 pc) |
Absolute magnitude (MV) | −1.46[5] |
Orbit[6] | |
Period (P) | 21.7056 d |
Eccentricity (e) | 0.22 |
Periastron epoch (T) | 2,435,216.669 JD |
Argument of periastron (ω) (secondary) | 12.7° |
Semi-amplitude (K1) (primary) | 34.9 km/s |
Details | |
Mass | 7.6±0.1[7] M☉ |
Luminosity (bolometric) | 5,129[8] L☉ |
Temperature | 17,100[8] K |
Rotational velocity (v sin i) | 0[9] or 45[4] km/s |
Age | 39.8±7.6[7] Myr |
Other designations | |
Database references | |
SIMBAD | data |
Delta2 Telescopii is a blue-white-hued binary star[6] system in the southern constellation of Telescopium. It is faintly visible to the naked eye, having an apparent visual magnitude of 5.05.[2] The distance to this system, as determined with an annual parallax shift of 2.73 mas,[1] is roughly 1,200 light-years. At that distance, the visual magnitude of the star is diminished by an extinction of 0.36 due to interstellar dust.[5] The pair have an orbital period of 21.7 days and an eccentricity of 0.22.[6] For the merged stellar classification, Houk (1978) gives B3 IV/V,[3] while Levato (1975) lists a more evolved class of B3 III.[4] It appears to be a relatively young system, barely 40 million years old.[7]