Xi Telescopii

Xi Telescopii, Latinized from ξ Telescopii, is a solitary^[6] star in the southern constellation of Telescopium.^[11] It is visible to the naked eye, with an apparent visual magnitude of +4.95.^[3] Based upon an annual parallax shift of 3.02 mas as measured from Earth,^[2] it is located approximately 1,100 light-years from the Sun.

Xi Telescopii

A light curve for Xi Telescopii, plotted from Hipparcos data[1]
Observation data Epoch J2000.0      Equinox J2000.0 (ICRS)
Constellation	Telescopium
Right ascension	20h 07m 23.15599s[2]
Declination	−52° 52′ 50.8490″[2]
Apparent magnitude (V)	4.95[3] (+4.89 – 4.94)[4]
Characteristics
Spectral type	K5 III[5] or M1 IIab[6]
U−B color index	+1.90[3]
B−V color index	+1.61[3]
Variable type	LB:[4]
Astrometry
Radial velocity (Rv)	+36.0[7] km/s
Proper motion (μ)	RA: −12.98[2] mas/yr Dec.: +7.50[2] mas/yr
Parallax (π)	3.02±0.35 mas[2]
Distance	approx. 1,100 ly (approx. 330 pc)
Absolute magnitude (MV)	−2.64[8]
Details
Radius	56[9] R☉
Luminosity	2,973[10] L☉
Temperature	4,030[10] K
Other designations
ξ Tel, CPD−53°9794, FK5 755, HD 190421, HIP 99120, HR 7673, SAO 246443[11]
Database references
SIMBAD	data

This is an evolved star with a stellar classification of K5 III^[5] or M1 IIab,^[6] indicating it is a giant or bright giant star. This is a variable star tentatively classified as a slow irregular-type variable with a brightness that varies between magnitude +4.89 and +4.94.^[4] Koen and Eyer examined the Hipparcos data for this star, and found that it varied periodically, with a period of 12.36 days, and an amplitude of 0.0083 magnitudes.^[12] With around 56^[9] times the Sun's radius, it shines with a luminosity approximately 2,973 times that of the Sun and has a surface temperature of 4,030 K.^[10]