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Star in the constellation Telescopus From Wikipedia, the free encyclopedia
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.
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 | |
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]