Observation data Epoch J2000 Equinox J2000 |
|
---|---|
Constellation | Monoceros |
Right ascension | 06h 23m 46.08471s |
Declination | 4° 35′ 34.3153″ |
Apparent magnitude (V) | 4.39 |
Characteristics | |
Spectral type | A5IV |
U−B color index | +0.14 |
B−V color index | +0.20 |
Astrometry | |
Radial velocity (Rv) | +13.10 km/s |
Proper motion (μ) |
RA: -22.06 mas/yr Dec.: +10.91 mas/yr |
Parallax (π) | 26.67 ± 0.90mas |
Distance | 122 ± 4 ly (37 ± 1 pc) |
Absolute magnitude (MV) | 1.52 |
Details | |
Mass | 2.04 M☉ |
Radius | 2.5 R☉ |
Luminosity | 25 L☉ |
Surface gravity (log g) | 3.95 cgs |
Temperature | 7,923 K |
Metallicity [Fe/H] | -0.11 dex |
Rotational velocity (v sin i) | 149 km/s |
Other designations | |
Database references | |
SIMBAD | data |
Observation data Epoch J2000 Equinox J2000 |
|
---|---|
Constellation | Monoceros |
Right ascension | 06h 23m 46.48292s |
Declination | 4° 35′ 45.2307″ |
Apparent magnitude (V) | 6.72 |
Characteristics | |
Spectral type | F5V |
U−B color index | -0.05 |
B−V color index | +0.45 |
Astrometry | |
Radial velocity (Rv) | +12.40 km/s |
Proper motion (μ) |
RA: -21.86 mas/yr Dec.: +11.35 mas/yr |
Parallax (π) | 26.95 ± 0.99mas |
Distance | 121 ± 4 ly (37 ± 1 pc) |
Absolute magnitude (MV) | 3.88 |
Details | |
Mass | 1.16 M☉ |
Radius | 1.1 R☉ |
Luminosity | 2.39 L☉ |
Surface gravity (log g) | 3.95 cgs |
Temperature | 7,923 K |
Rotational velocity (v sin i) | 25 km/s |
Other designations | |
Database references | |
SIMBAD | data |
ε Monocerotis, Latinised as Epsilon Monocerotis, is the Bayer designation of a binary star in the constellation Monoceros.
Its location is guide for sky navigation toward Rosette nebula
The primary is a class A5IV (white subgiant) star in the constellation Monoceros. Its apparent magnitude is 4.39 and it is approximately 122 light years away based on parallax. It is reportedly a spectroscopic binary with a period around 331 days.
The B component, at a separation of around 12.3", is a class F5V (yellow-white dwarf) star, with an apparent magnitude of 6.72.