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

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.

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]

References