Xi Telescopii

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]
Distanceapprox. 1,100 ly
(approx. 330 pc)
Absolute magnitude (MV)−2.64[8]
Details
Radius56[9] R☉
Luminosity2,973[10] L☉
Temperature4,030[10] K
Other designations
ξ Tel, CPD−53°9794, FK5 755, HD 190421, HIP 99120, HR 7673, SAO 246443[11]
Database references
SIMBADdata

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]

  1. ^ Cite error: The named reference CDS was invoked but never defined (see the help page).
  2. ^ a b c d e f Cite error: The named reference vanLeeuwen2007 was invoked but never defined (see the help page).
  3. ^ a b c d Cite error: The named reference Fernie1983 was invoked but never defined (see the help page).
  4. ^ a b c Cite error: The named reference AAVSOxi was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference houk1978 was invoked but never defined (see the help page).
  6. ^ a b c Cite error: The named reference Eggleton2008 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference fk6_3 was invoked but never defined (see the help page).
  8. ^ Cite error: The named reference Anderson2012 was invoked but never defined (see the help page).
  9. ^ a b Cite error: The named reference cadars was invoked but never defined (see the help page).
  10. ^ a b c Cite error: The named reference Mcdonald2012 was invoked but never defined (see the help page).
  11. ^ a b Cite error: The named reference SIMBAD was invoked but never defined (see the help page).
  12. ^ Cite error: The named reference Koen was invoked but never defined (see the help page).