Star · B9II
73 Ori
73 Ori is a bright giant star of spectral type B9II in the constellation Orion, 1,392 light-years from the Sun.
| Other names | HIP 29736 |
|---|---|
| Constellation | Orion |
| Distance | 1,392 light-years (426.8 pc) |
| Apparent magnitude | magnitude 5.44 |
| Absolute magnitude | magnitude −2.71 |
| Spectral type | B9II |
| Surface temperature | 9,940 K |
| Luminosity | 1,420 L☉ |
| Radius | 12.7 R☉ |
| Mass | 7.22 M☉ (estimated) |
| Right ascension (J2000) | 6h 15m 45.0s |
| Declination (J2000) | +12° 33′ 04″ |
| Space velocity (relative to the Sun) | 13.7 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.44). Visible from the whole Northern Hemisphere and south to latitude 77° S. North of latitude 77° N it never sets. 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 634. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 25 million years.
The Sun seen from there
From a planet around 73 Ori, the Sun would look like a star of magnitude 12.98, in the direction where our sky has the constellation Serpens. It would be invisible to the naked eye.
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.