Delta2 Telescopii

Delta² Telescopii
Observation data; Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Telescopium
Right ascension	18h 32m 01.94437s
Declination	−45° 45′ 26.5636″
Apparent magnitude (V)	5.05
Characteristics
Spectral type	B3 IV/V or B3 III
U−B color index	−0.52
B−V color index	−0.12
Astrometry
Proper motion (μ)	RA: +0.16 mas/yr ; Dec.: −10.23 mas/yr
Parallax (π)	2.73 ± 0.26 mas
Distance	1,200 ± 100 ly ; (370 ± 30 pc)
Absolute magnitude (MV)	−1.46
Orbit
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 M☉
Luminosity (bolometric)	5,129 L☉
Temperature	17,100 K
Rotational velocity (v sin i)	0 or 45 km/s
Age	39.8±7.6 Myr
Other designations
	δ2 Tel, CD−45° 12556, HD 170523, HIP 90853, HR 6938, SAO 229095
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]

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 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)

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[vanLeeuwen2007-1] ^ ^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.

[Fernie1983-2] 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.

[houk1978-3] 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.

[levato-4] Levato, H. (1975), "Rotational velocities and spectral types for a sample of binary systems", Astronomy and Astrophysics, 19: 91, Bibcode:1975A&AS...19...91L.

[Gontcharov2012-5] 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.

[Pourbaix2009-6] 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.

[Tetzlaff2011-7] 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.

[Hohle2010-8] 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_fukuda70-9] 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.

[SIMBAD-10] "del02 Tel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2017-06-07.{{cite web}}: CS1 maint: postscript (link)

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Observation data Epoch J2000.0 Equinox J2000.0 (ICRS)
Constellation	Telescopium
Right ascension	18^h 32^m 01.94437^s^[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 (M_V)	−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
δ² Tel, CD−45° 12556, HD 170523, HIP 90853, HR 6938, SAO 229095^[10]
Database references
SIMBAD	data