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λ Telescopii

Location of λ Tel (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Telescopium
Right ascension	18 58 27.79251
Declination	−52° 56′ 19.1999″
Apparent magnitude (V)	4.84±0.01
Characteristics
Spectral type	B9.5 IV/V or B9 III
B−V color index	−0.05
Astrometry
Radial velocity (Rv)	−2±4.2 km/s
Proper motion (μ)	RA: +13.365 mas/yr Dec.: −8.805 mas/yr
Parallax (π)	6.6117 ± 0.1718 mas
Distance	490 ± 10 ly (151 ± 4 pc)
Absolute magnitude (MV)	−1.51
Details
Mass	2.81 −0.38 M☉
Radius	5.53±0.28 R☉
Luminosity	260 −12 L☉
Surface gravity (log g)	3.56 cgs
Temperature	10,139 K
Metallicity	+0.19 dex
Rotational velocity (v sin i)	110 km/s
Age	268 Myr
Other designations
λ Tel, 41 G. Telescopii[15], CPD−53°9402, FK5 708, GC 26016, HD 175510, HIP 93148, HR 7134, SAO 245834
Database references
SIMBAD	data

λ Telescopii, Latinized as Lambda Telescopii, is a solitary, bluish-white hued star located in the southern constellation of Telescopium. It has an apparent magnitude of 4.84, making it readily visible to the naked eye under ideal conditions. Gaia DR3 parallax measurements imply a distance of 490 light years, and it is currently approaching the Solar System with a somewhat constrained heliocentric radial velocity of −2 km/s. At its current distance, the visual magnitude of Lambda Telescopii is diminished by an extinction of 0.25 due to interstellar dust and it has an absolute magnitude of −1.51.

The object has been given several stellar classifications over the years. Lambda Telescopii has been classified as B9 III (evolved giant star), A0 V (A-type main-sequence star), and B9 .5 IV/V.

The accepted classification for Lambda Telescopii is B9.5 IV/V, indicating that it is a late B-type star with the blended luminosity class of a subgiant and a main sequence star. Gaia DR3 stellar evolution models place it near the end of its main sequence lifetime. The star is 268 million years old with a relatively high rate of spin, showing a projected rotational velocity of 110 km/s. Lambda Telescopii is metal enriched with an iron abundance 155% that of the Sun, or = +0.19. The star has 2.81 times the mass of the Sun and it radiates 260 times the luminosity of the Sun from its photosphere – which is 5.53 times the size of the Sun's – at an effective temperature of 10,193 K.

References

1. ^ 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.
2. ^ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (March 2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 – L30. Bibcode:2000A&A...355L..27H. ISSN 0004-6361. S2CID 17128864.
3. ^ Houk, N.; Cowley, A. P. (1975). University of Michigan Catalogue of two-dimensional spectral types for the HD stars: Declinations −90° to −53°. Vol. 1. Bibcode:1975mcts.book.....H.
4. ^ de Vaucouleurs, A. (1 August 1957). "Spectral Types and Luminosities of B, A and F Southern Stars". Monthly Notices of the Royal Astronomical Society. 117 (4): 449–462. Bibcode:1957MNRAS.117..449D. doi:10.1093/mnras/117.4.449. eISSN 1365-2966. ISSN 0035-8711. S2CID 121925254.
5. Corben, P. M.; Stoy, R. H. (1968), "Photoelectric Magnitudes and Colours for Bright Southern Stars", Monthly Notes of the Astronomical Society of Southern Africa, 27: 11, Bibcode:1968MNSSA..27...11C.
6. ^ Gontcharov, G. A. (November 2006). "Pulkovo Compilation of Radial Velocities for 35,495 Hipparcos stars in a common system". Astronomy Letters. 32 (11): 759–771. arXiv:1606.08053. Bibcode:2006AstL...32..759G. doi:10.1134/S1063773706110065. eISSN 1562-6873. ISSN 1063-7737. S2CID 119231169.
7. ^ Anderson, E.; Francis, Ch. (May 2012). "XHIP: An extended hipparcos compilation". Astronomy Letters. 38 (5): 331–346. arXiv:1108.4971. Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. eISSN 1562-6873. ISSN 1063-7737. S2CID 119257644.
8. ^ Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv:1905.10694. Bibcode:2019AJ....158..138S. doi:10.3847/1538-3881/ab3467. eISSN 1538-3881. hdl:1721.1/124721. S2CID 166227927.
9. ^ Kervella, P.; Thévenin, F.; Di Folco, E.; Ségransan, D. (October 2004). "The angular sizes of dwarf stars and subgiants. Surface brightness relations calibrated by interferometry". Astronomy & Astrophysics. 426 (1): 297–307. arXiv:astro-ph/0404180. Bibcode:2004A&A...426..297K. doi:10.1051/0004-6361:20035930. eISSN 1432-0746. ISSN 0004-6361. S2CID 6077801.
10. Anders, F.; et al. (August 2019). "Photo-astrometric distances, extinctions, and astrophysical parameters for Gaia DR2 stars brighter than G = 18". Astronomy & Astrophysics. 628: A94. arXiv:1904.11302. Bibcode:2019A&A...628A..94A. doi:10.1051/0004-6361/201935765. eISSN 1432-0746. ISSN 0004-6361. S2CID 131780028.
11. ^ Erspamer, D.; North, P. (28 January 2003). "Automated spectroscopic abundances of A and F-type stars using echelle spectrographs". Astronomy & Astrophysics. 398 (3): 1121–1135. arXiv:astro-ph/0210065. Bibcode:2003A&A...398.1121E. doi:10.1051/0004-6361:20021711. eISSN 1432-0746. ISSN 0004-6361. S2CID 1109164.
12. ^ Huang, Su-Shu (September 1953). "A Statistical Study of the Rotation of the Stars". The Astrophysical Journal. 118: 285. Bibcode:1953ApJ...118..285H. doi:10.1086/145751. eISSN 1538-4357. ISSN 0004-637X.
13. ^ Levato, O. H. (August 1972). "Rotational Velocities and Spectral Types of Some A-Type Stars". Publications of the Astronomical Society of the Pacific. 84 (500): 584. Bibcode:1972PASP...84..584L. doi:10.1086/129336. eISSN 1538-3873. ISSN 0004-6280. S2CID 122833746.
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15. Gould, Benjamin Apthorp (1878). "Uranometria Argentina : brillantez y posicion de las estrellas fijas, hasta la septima magnitud, comprendidas dentro de cien grados del polo austral : con atlas". Resultados del Observatorio Nacional Argentino. 1. Bibcode:1879RNAO....1.....G.
16. "lam Tel". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved June 5, 2017.{{cite web}}: CS1 maint: postscript (link)
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v t e Constellation of Telescopium
List of stars in Telescopium Telescopium in Chinese astronomy
Stars	Bayer α δ δ ε ζ η ι κ λ μ ν ξ ρ τ Variable RR RS RX BL HO PV PW PZ QQ QS QU QV HR 6778 6821 6894 6954 6986 7065 7092 7093 7095 7097 7190 7223 7233 7271 7289 7297 7370 7388 7411 7459 7521 7537 7548 7549 7621 7674 7714 7745 7749 7758 7766 HD 168871 173047 177365 181295 191760 Other KELT-10 Gliese 754 Gliese 784 GJ 1252
Exoplanets Gliese 754 b Gliese 784 b GJ 1252 b KELT-10b
Star clusters NGC 6584
Galaxies	NGC 6845 6861 Other PKS 2014-55
Category

• Bayer objects
• Telescopium
• Durchmusterung objects
• Henry Draper Catalogue objects
• Hipparcos objects
• Bright Star Catalogue objects
• B-type subgiants
• B-type main-sequence stars
• Gould objects