Star in the constellation Telescopium
For other stars with this Bayer designation, see
δ Telescopii .
Delta2 Telescopii
Observation dataEpoch 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
Evolutionary stage
subgiant [ 3]
Spectral type
B3 IV/V[ 4] [ 5]
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 pc ) Absolute magnitude (MV )−1.46[ 6] Orbit [ 7] Period (P)21.7056 d Eccentricity (e)0.22 Periastron epoch (T)2,435,216.669 JD Argument of periastron (ω)12.7° Semi-amplitude 1 )34.9 km/s Details Mass ± 0.1[ 8] M ☉ Radius 7,2[ 3] R ☉ Luminosity (bolometric) 5,129[ 9] L ☉ Surface gravity (log g )3.37[ 3] cgs Temperature 17,100[ 9] K Rotational velocity (v sin i )0[ 10] [ 5] Age ± 7.6[ 8] Myr Other designations δ2 Tel , CD −45°12556HD 170523HIP 90853HR 6938SAO 229095[ 11] Database references SIMBAD data
Delta2 Telescopii is a blue-white-hued binary star [ 7] southern constellation of Telescopium . It is faintly visible to the naked eye, having an apparent visual magnitude of 5.05.[ 2] parallax shift of 2.73 mas ,[ 1] light-years . At that distance, the visual magnitude of the star is diminished by an extinction of 0.36 due to interstellar dust .[ 6] orbital period of 21.7 days and an eccentricity of 0.22.[ 7] stellar classification , Houk (1978) gives B3 IV/V,[ 4] evolved class of B3 III.[ 5] [ 8]
References
^ a b c d e f van Leeuwen, F. (2007), "Validation of the new Hipparcos reduction", Astronomy and Astrophysics , 474 (2): 653– 664, arXiv :0708.1752 Bibcode :2007A&A...474..653V , doi :10.1051/0004-6361:20078357 , S2CID 18759600 . ^ a b c d Fernie, J. D. (May 1983), "New UBVRI photometry for 900 supergiants", Astrophysical Journal Supplement Series , 52 : 7– 22, Bibcode :1983ApJS...52....7F , doi :10.1086/190856 ^ a b c Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties" . Astronomy and Astrophysics . 674 : A1. arXiv :2208.00211 Bibcode :2023A&A...674A...1G . doi :10.1051/0004-6361/202243940 S2CID 244398875 . Gaia DR3 record for this source at VizieR .^ a b Houk, Nancy (1978), Michigan catalogue of two-dimensional spectral types for the HD stars , vol. 2, Ann Arbor: Dept. of Astronomy, University of Michigan, Bibcode :1978mcts.book.....H . ^ a b c Levato, H. (1975), "Rotational velocities and spectral types for a sample of binary systems", Astronomy and Astrophysics , 19 : 91, Bibcode :1975A&AS...19...91L . ^ a b Gontcharov, G. A. (November 2012), "Spatial distribution and kinematics of OB stars", Astronomy Letters , 38 (11): 694– 706, arXiv :1606.09028 Bibcode :2012AstL...38..694G , doi :10.1134/S1063773712110035 , S2CID 119108982 . ^ a b c Pourbaix, D.; et al. (2004), "SB9: The Ninth Catalogue of Spectroscopic Binary Orbits", Astronomy & Astrophysics , 424 : 727– 732, arXiv :astro-ph/0406573 Bibcode :2004A&A...424..727P , doi :10.1051/0004-6361:20041213 , S2CID 119387088 . ^ a b c Tetzlaff, N.; et al. (January 2011), "A catalogue of young runaway Hipparcos stars within 3 kpc from the Sun", Monthly Notices of the Royal Astronomical Society 410 (1): 190– 200, arXiv :1007.4883 Bibcode :2011MNRAS.410..190T , doi :10.1111/j.1365-2966.2010.17434.x S2CID 118629873 . ^ a b Hohle, M. M.; et al. (April 2010), "Masses and luminosities of O- and B-type stars and red supergiants", Astronomische Nachrichten , 331 (4): 349, arXiv :1003.2335 Bibcode :2010AN....331..349H , doi :10.1002/asna.200911355 , S2CID 111387483 . ^ Uesugi, Akira; Fukuda, Ichiro (1970), "Catalogue of rotational velocities of the stars", Contributions from the Institute of Astrophysics and Kwasan Observatory , University of Kyoto, Bibcode :1970crvs.book.....U . ^ "del02 Tel" . SIMBAD Centre de données astronomiques de Strasbourg . Retrieved 2017-06-07 .{{cite web }}: CS1 maint: postscript (link )
