Zeta Monocerotis
Yellow-white hued star in the constellation Monoceros
From Wikipedia, the free encyclopedia
Zeta Monocerotis, Latinized from ζ Monocerotis, is a single,[9] yellow-hued star in the constellation Monoceros. It has an apparent visual magnitude of 4.33,[2] which is bright enough to be visible to the naked eye. The annual parallax shift as measured during the Hipparcos mission is 3.08 milliarcseconds,[1] which provides a rough distance estimate of 1,060 light years. It is moving away from the Sun with a radial velocity of +30 km/s.[4]
 | |
| Observation data Epoch J2000 Equinox ICRS | |
|---|---|
| Constellation | Monoceros |
| Right ascension | 08h 08m 35.64663s[1] |
| Declination | −02° 59′ 01.6361″[1] |
| Apparent magnitude (V) | 4.33[2] |
| Characteristics | |
| Spectral type | G2Ib[3] |
| U−B color index | +0.72[2] |
| B−V color index | +0.97[2] |
| Astrometry | |
| Radial velocity (Rv) | +29.8±0.3[4] km/s |
| Proper motion (μ) | RA: −18.81[1] mas/yr Dec.: −4.50[1] mas/yr |
| Parallax (π) | 3.08±0.27 mas[1] |
| Distance | 1,060 ± 90 ly (320 ± 30 pc) |
| Absolute magnitude (MV) | −3.18[5] |
| Details | |
| Mass | 6.2[6] M☉ |
| Luminosity | 2,207[5] L☉ |
| Surface gravity (log g) | 1.75[7] cgs |
| Temperature | 5,289[8] K |
| Metallicity [Fe/H] | +0.01[7] dex |
| Rotational velocity (v sin i) | 17[3] km/s |
| Other designations | |
| ζ Mon, 29 Monocerotis, BD−02°2450, GC 11051, HD 67594, HIP 39863, HR 3188, SAO 135551, CCDM J08086-0259A, WDS J08086-0259A | |
| Database references | |
| SIMBAD | data |
This star has a stellar classification of G2 Ib,[3] which matches a supergiant of type G. It has an estimated 6.2[6] times the mass of the Sun and is radiating 2,207[5] times the Sun's luminosity from its photosphere at an effective temperature of 5,289 K.[8] Zeta Monocerotis has three visual companions: component B, with separation 33.3" and magnitude 10.32, C, with separation 65.1" and magnitude 9.68, and D, with separation 38.1" and magnitude 13.4.[10]