Iota Telescopii

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]

ι Telescopii

Location of Iota Telescopii (circled)
Observation data Epoch J2000.0      Equinox J2000.0 (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]