17 Monocerotis
Star in the constellation Monoceros
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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 | +08° 02â² 14.1239â³[1] |
| Apparent magnitude (V) | 4.77[2] |
| Characteristics | |
| Spectral type | K4 III[3] |
| UâB color index | +1.65[2] |
| BâV 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 (Ï) | 6.62±0.25 mas[1] |
| Distance | 490 ± 20 ly (151 ± 6 pc) |
| Absolute magnitude (MV) | -1.12[5] |
| Details | |
| Radius | 25+1 â3[1] Râ |
| Luminosity | 538.2±23.8[1] Lâ |
| 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 | |
| 17 Mon, BD+08°1496, GC 8880, HD 49161, HIP 32533, HR 2503, SAO 114410 | |
| 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]