Iota Telescopii
K-type giant; Telescopium
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ι Telescopii, Latinized as Iota Telescopii and abbreviated Iota Tel, is a solitary star[13] located in the southern constellation Telescopium. It is faintly visible to the naked eye as an orange-hued star with an apparent visual magnitude of +4.88.[2] The star is located roughly 377 light years distant from the Solar System based on Gaia DR3 parallax measurements[1] and it is receding with a radial velocity of 22.3 km/s.[5] At its current distance, Iota Tel's brightness is diminished by 0.19 magnitudes[14] due to interstellar dust and it has an absolute magnitude of −0.39.[6]
 | |
| Observation data Epoch J2000.0 Equinox ICRS | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 19h 35m 12.98634s[1] |
| Declination | −48° 05′ 57.1238″[1] |
| Apparent magnitude (V) | 4.88±0.01[2] |
| Characteristics | |
| Spectral type | K0 III[3] |
| B−V color index | +1.09[4] |
| Astrometry | |
| Radial velocity (Rv) | +22.3±0.8[5] km/s |
| Proper motion (μ) | RA: −8.190 mas/yr[1] Dec.: −36.977 mas/yr[1] |
| Parallax (π) | 8.6546±0.1055 mas[1] |
| Distance | 377 ± 5 ly (116 ± 1 pc) |
| Absolute magnitude (MV) | −0.39[6] |
| Details | |
| Mass | 2.53±0.19[7] M☉ |
| Radius | 19.7±1.0[8] R☉ |
| Luminosity | 172+5 −4[1] L☉ |
| Surface gravity (log g) | 1.88[9] cgs |
| Temperature | 4,738±55[7] K |
| Metallicity [Fe/H] | +0.01±0.04[7] dex |
| Rotational velocity (v sin i) | 1.8±1.3[10] km/s |
| Other designations | |
| ι Tel, 64 G. Telescopii[11], CD−48°13161, CPD−48°10202, FK5 735, GC 27025, HD 184127, HIP 96341, HR 7424, SAO 229751[12] | |
| Database references | |
| SIMBAD | data |
This object is an aging red giant star with a stellar classification of K0 III.[3] At present it has 2.53 times the mass of the Sun,[7] but it has expanded to 19.7 times the radius of the Sun.[8] It is radiating 172 times the Sun's luminosity[1] from its swollen photosphere at an effective temperature of 4,738 K.[7] Iota Tel has a near solar metallicity at [Fe/H] = +0.01[7] and it spins slowly with a projected rotational velocity of 1.8 km/s.[10]