Rho Telescopii
Star in the constellation Telescopium
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Rho Telescopii (ρ Tel, ρ Telescopii) is an astrometric binary[9] star system in the southern constellation of Telescopium. It is visible to the naked eye, with an apparent visual magnitude of +5.17.[2] Based upon an annual parallax shift of 17.63 mas as measured from Earth,[1] it is located approximately 185 light years from the Sun.
| Observation data Epoch J2000.0 Equinox J2000.0 (ICRS) | |
|---|---|
| Constellation | Telescopium |
| Right ascension | 19h 06m 19.95580s[1] |
| Declination | −52° 20′ 27.2757″[1] |
| Apparent magnitude (V) | +5.17[2] |
| Characteristics | |
| Spectral type | F6 V[3] |
| B−V color index | +0.53[2] |
| Astrometry | |
| Radial velocity (Rv) | +0.1±0.7[4] km/s |
| Proper motion (μ) | RA: +32.47[1] mas/yr Dec.: −115.24[1] mas/yr |
| Parallax (π) | 17.63±0.59 mas[1] |
| Distance | 185 ± 6 ly (57 ± 2 pc) |
| Absolute magnitude (MV) | 1.69[5] |
| Details | |
| Mass | 1.97[4] M☉ |
| Luminosity | 25.6[6] L☉ |
| Surface gravity (log g) | 3.51[4] cgs |
| Temperature | 6,303±80[4] K |
| Metallicity [Fe/H] | +0.01[7] dex |
| Rotational velocity (v sin i) | 68.5±4.0[5] km/s |
| Age | 1.30[4] Gyr |
| Other designations | |
| ρ Tel, CPD−52°11356, HD 177171, HIP 93815, HR 7213, SAO 245921[8] | |
| Database references | |
| SIMBAD | data |
This appears to be a single-lined spectroscopic binary as it displays radial velocity variation with a period of 1.7 days.[9] The visible component is an F-type main sequence star with a stellar classification of F6 V.[3] It has about double the mass of the Sun and is radiating 25.6[6] times the solar luminosity from its photosphere at an effective temperature of 6,303 K.[4] The star is a bright X-ray source with a luminosity of 65.76×1029 ergs s−1.[10]
Relative to neighboring stars, Rho Telescopii has a peculiar velocity of 17.2 km s−1.[11] It may be a member of the Tucana-Horologium association.[12]