Xi Telescopii
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 20h 07m 23.15599s |
| Declination | −52° 52′ 50.8490″ |
| Apparent magnitude (V) | 4.95 (+4.89 – 4.94) |
| Characteristics | |
| Evolutionary stage | red giant branch |
| Spectral type | K5 III or M1 IIab |
| U−B color index | +1.90 |
| B−V color index | +1.61 |
| Variable type | LB: |
| Astrometry | |
| Radial velocity (Rv) | +36.0 km/s |
| Proper motion (μ) | RA: −12.98 mas/yr Dec.: +7.50 mas/yr |
| Parallax (π) | 3.02±0.35 mas |
| Distance | approx. 1,100 ly (approx. 330 pc) |
| Absolute magnitude (MV) | −2.64 |
| Details | |
| Mass | 6.6 M☉ |
| Radius | 134 R☉ |
| Luminosity | 3,413 L☉ |
| Surface gravity (log g) | 0.99 cgs |
| Temperature | 4,529 K |
| Other designations | |
| ξ Tel, CPD−53°9794, FK5 755, HD 190421, HIP 99120, HR 7673, SAO 246443 | |
| Database references | |
| SIMBAD | data |
Xi Telescopii, Latinized from ξ Telescopii, is a solitary star in the southern constellation of Telescopium. It is visible to the naked eye, with an apparent visual magnitude of +4.95. Based upon an annual parallax shift of 3.02 mas as measured from Earth, it is located approximately 1,100 light-years from the Sun.
This is an evolved star with a stellar classification of K5 III or M1 IIab, 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. 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. With around 56 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.