Lambda Telescopii

λ Telescopii
Location of λ Tel (circled)
Observation data
Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation Telescopium
Right ascension 18h 58m 27.79251s[1]
Declination −52° 56′ 19.1999″[1]
Apparent magnitude (V) 4.84±0.01[2]
Characteristics
Spectral type B9.5 IV/V[3] or B9 III[4]
B−V color index −0.05[5]
Astrometry
Radial velocity (Rv)−2±4.2[6] km/s
Proper motion (μ) RA: +13.365 mas/yr[1]
Dec.: −8.805 mas/yr[1]
Parallax (π)6.6117 ± 0.1718 mas[1]
Distance490 ± 10 ly
(151 ± 4 pc)
Absolute magnitude (MV)−1.51[7]
Details
Mass2.81+0.36
−0.38[8] M☉
Radius5.53±0.28[9] R☉
Luminosity260+13
−12[1] L☉
Surface gravity (log g)3.56[10] cgs
Temperature10,139[11] K
Metallicity [Fe/H]+0.19[11] dex
Rotational velocity (v sin i)110[12][13] km/s
Age268[14] Myr
Other designations
λ Tel, 41 G. Telescopii[15], CPD−53°9402, FK5 708, GC 26016, HD 175510, HIP 93148, HR 7134, SAO 245834[16]
Database references
SIMBADdata

λ Telescopii, Latinized as Lambda Telescopii, is a solitary,[17] bluish-white hued star located in the southern constellation of Telescopium. It has an apparent magnitude of 4.84,[2] making it readily visible to the naked eye under ideal conditions. Gaia DR3 parallax measurements imply a distance of 490 light years,[1] and it is currently approaching the Solar System with a somewhat constrained heliocentric radial velocity of −2 km/s.[6] At its current distance, the visual magnitude of Lambda Telescopii is diminished by an extinction of 0.25 due to interstellar dust[18] and it has an absolute magnitude of −1.51.[7]

The object has been given several stellar classifications over the years. Lambda Telescopii has been classified as B9 III (evolved giant star),[4] A0 V (A-type main-sequence star),[13] and B9 .5 IV/V.[3]

The accepted classification for Lambda Telescopii is B9.5 IV/V,[3] 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.[1] The star is 268 million years old[14] with a relatively high rate of spin, showing a projected rotational velocity of 110 km/s.[12][13] Lambda Telescopii is metal enriched with an iron abundance 155% that of the Sun, or [Fe/H] = +0.19.[11] The star has 2.81 times the mass of the Sun[8] and it radiates 260 times the luminosity of the Sun[1] from its photosphere – which is 5.53 times the size of the Sun's – at an effective temperature of 10,193 K.[9] [11]

  1. ^ a b c d e f g h Cite error: The named reference GaiaDR3 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference Tycho2000 was invoked but never defined (see the help page).
  3. ^ a b c Cite error: The named reference Houk1975 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference de Vaucouleurs1957 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Corben1968 was invoked but never defined (see the help page).
  6. ^ a b Cite error: The named reference Gontcharov2006 was invoked but never defined (see the help page).
  7. ^ a b Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  8. ^ a b Cite error: The named reference Stassun2019 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference Kervella2004 was invoked but never defined (see the help page).
  10. ^ Cite error: The named reference Anders2019 was invoked but never defined (see the help page).
  11. ^ a b c d Cite error: The named reference Erspamer2003 was invoked but never defined (see the help page).
  12. ^ a b Cite error: The named reference Huang1953 was invoked but never defined (see the help page).
  13. ^ a b c Cite error: The named reference Levato1972 was invoked but never defined (see the help page).
  14. ^ a b Cite error: The named reference Gontcharov2012 was invoked but never defined (see the help page).
  15. ^ Cite error: The named reference Gould1879 was invoked but never defined (see the help page).
  16. ^ Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  17. ^ Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  18. ^ Cite error: The named reference Gontcharov2017 was invoked but never defined (see the help page).