17 Monocerotis is a single[9] star located around 490[1] light years away from the Sun in the equatorial constellation of Monoceros. It is visible to the naked eye as a faint, orange-hued star with an apparent visual magnitude of 4.77.[2] The star is moving away from the Earth with a heliocentric radial velocity of +46 km/s.[4]
Observation data Epoch J2000 Equinox J2000 | |
---|---|
Constellation | Monoceros |
Right ascension | 06h 47m 19.82946s[1] |
Declination | 8° 02′ 14.1239″[1] |
Apparent magnitude (V) | 4.77[2] |
Characteristics | |
Spectral type | K4 III[3] |
U−B color index | +1.65[2] |
B−V color index | +1.40[2] |
Astrometry | |
Radial velocity (Rv) | +46.19[4] km/s |
Proper motion (μ) | RA: -23.728[1] mas/yr Dec.: -12.011[1] mas/yr |
Parallax (π) | 6.62 ± 0.25 mas[1] |
Distance | 490 ± 20 ly (151 ± 6 pc) |
Absolute magnitude (MV) | -1.12[5] |
Details | |
Radius | 25+1 −3[1] R☉ |
Luminosity | 538.2±23.8[1] L☉ |
Surface gravity (log g) | 1.86[6] cgs |
Temperature | 4,345[7] K |
Metallicity [Fe/H] | +0.06[5] dex |
Rotational velocity (v sin i) | 2.5[8] km/s |
Other designations | |
Database references | |
SIMBAD | data |
This is an aging giant star with a stellar classification of K4 III.[3] As a consequence of having exhausted the supply of hydrogen at its core, the star has expanded to 25[1] times the radius of the Sun. It is radiating around 538[1] times the Sun's luminosity from its swollen photosphere at an effective temperature of 4,345 K.[7]