Lambda Telescopii
Template:Location mark Location of λ Tel (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Telescopium |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 4.84±0.01[2] |
| Characteristics | |
| Spectral type | B9.5 IV/V[3] or B9 III[4] |
| B−V Template:Engvar | −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] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | −1.51[7] |
| Details | |
| Mass | 2.81Template:Su[8] Template:Solar mass |
| Radius | 5.53±0.28[9] Template:Solar radius |
| Luminosity | 260Template:Su[1] Template:Solar luminosity |
| Surface gravity (log g) | 3.56[10] cgs |
| Temperature | 10,139[11] K |
| Metallicity [Fe/H] | +0.19[11] dex |
| Rotational velocity (v sin i) | 110[12][13] km/s |
| Age | 268[14] Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[15] | |
| Database references | |
| SIMBAD | data |
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λ Telescopii, Latinized as Lambda Telescopii, is a solitary,[16] 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 Template:Val.[6] At its current distance, the visual magnitude of Lambda Telescopii is diminished by an extinction of 0.25 due to interstellar dust[17] 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 Template:Val.[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 Template:Val.[9][11]
References
Template:Reflist Template:Stars of Telescopium
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