Nu Telescopii
Template:Location mark Location of ν Telescopii (circled) | |
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Telescopium |
| Right ascension | Template:RA[1] |
| Declination | Template:DEC[1] |
| Apparent magnitude (V) | 5.33±0.01[2] |
| Characteristics | |
| Spectral type | A7 III/IV[3] |
| B−V Template:Engvar | +0.20[4] |
| Astrometry | |
| Radial velocity (Rv) | −12.4±4.2[5] km/s |
| Proper motion (μ) | RA: +90.983 mas/yr[1] Dec.: −137.406 mas/yr[1] |
| Parallax (π) | 19.3152±0.0783 mas[1] |
| Distance | Template:Rnd ± Template:Rnd ly (Template:Rnd ± Template:Rnd pc) |
| Absolute magnitude (MV) | +1.86[6] |
| Details | |
| Mass | 1.85[7] Template:Solar mass |
| Radius | 1.94±0.09[8] Template:Solar radius |
| Luminosity | 15.6±0.1[9] Template:Solar luminosity |
| Surface gravity (log g) | 4.08Script error: No such module "Su".[10] cgs |
| Temperature | Script error: No such module "val".[7] K |
| Metallicity [Fe/H] | −0.02[11] dex |
| Age | 686[7] Myr |
| Metallicity [Fe/H] | {{{metal_fe2}}} dex |
| Other designations | |
| Template:Odlist[12][13] | |
| Database references | |
| SIMBAD | data |
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Nu Telescopii, Latinized from ν Telescopii, is a slightly evolved star in the southern constellation Telescopium. It has an apparent visual magnitude of 5.33,[4] allowing it to be faintly visible to the naked eye. The object is relatively close at a distance of 169 light years but is approaching the Solar System with a heliocentric radial velocity of about Script error: No such module "val"..[5]
There hasn't been much agreement on Nu Telescopii's spectral classification. It was initially categorized as Am star, with a classification of kA4mF3IV:.[14] This indicates that the object has the calcium K-lines of an A4 star and the metallic lines of a F3 subgiant. However, Nu Telescopii was shown not to have a peculiar spectrum and was given a class of A9 Vn,[15] indicating that it is an A-type main-sequence star displaying broad (nebulous) absorption lines due to rapid rotation. It has since been classified as an evolved A7 star with either a blended luminosity class of a giant star or subgiant (III/IV)[3] or only subgiant (IV).[16]
Nu Telescopii has a mass of Script error: No such module "val". and an age of 686 million years.[7] It has 1.94 times the radius of the Sun[8] and has an effective temperature of 8,199 K.[7] These parameters yield a luminosity of Script error: No such module "val".[9] from its photosphere and when viewed, has a white hue. Nu Telescopii's metallicity – what astronomers dub as elements heavier than helium – is around solar level.[11] Its motion in space matches that of the IC 2391 cluster, making it a probable member.[17]
There is a faint magnitude 9.3 companion star at an angular separation of 102 arc seconds along a position angle of 333°, as of 2010.[18]
References
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- ↑ a b c d Template:Cite Gaia EDR3
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- ↑ Template:Cite simbad
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