Star · A5IV
ε Mon
ε Mon is a subgiant star of spectral type A5IV in the constellation Monoceros, 135.5 light-years from the Sun.
| Other names | HIP 30419 |
|---|---|
| Constellation | Monoceros |
| Distance | 135.5 light-years (41.5 pc) |
| Apparent magnitude | magnitude 4.39 |
| Absolute magnitude | magnitude 1.30 |
| Spectral type | A5IV |
| Surface temperature | 8,050 K |
| Luminosity | 27.4 L☉ |
| Radius | 2.69 R☉ |
| Mass | 2.34 M☉ (estimated) |
| Right ascension (J2000) | 6h 23m 46.1s |
| Declination (J2000) | +4° 35′ 34″ |
| Space velocity (relative to the Sun) | 12.8 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 4.39). Visible from the whole Northern Hemisphere and south to latitude 85° S. It stands highest at midnight in December, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1891. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.4 million years.
The Sun seen from there
From a planet around ε Mon, the Sun would look like a star of magnitude 7.92, in the direction where our sky has the constellation Scutum. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 30422 5.33 light-years
- HIP 30243 13.3 light-years
- HIP 31655 14.1 light-years
- HIP 31069 19.3 light-years
- HIP 32933 19.3 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.