Star · G9III
HIP 30728
HIP 30728 is a giant star of spectral type G9III in the constellation Monoceros, 303.0 light-years from the Sun.
| Constellation | Monoceros |
|---|---|
| Distance | 303.0 light-years (92.9 pc) |
| Apparent magnitude | magnitude 5.55 |
| Absolute magnitude | magnitude 0.71 |
| Spectral type | G9III |
| Surface temperature | 4,660 K |
| Luminosity | 73.2 L☉ |
| Radius | 13.1 R☉ |
| Mass | 3.1 M☉ (estimated) |
| Right ascension (J2000) | 6h 27m 20.4s |
| Declination (J2000) | +2° 54′ 30″ |
| Space velocity (relative to the Sun) | 56.3 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.55). Visible from the whole Northern Hemisphere and south to latitude 87° 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 1723. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 5.4 million years.
The Sun seen from there
From a planet around HIP 30728, the Sun would look like a star of magnitude 9.67, in the direction where our sky has the constellation Serpens. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 30217 13.6 light-years
- HIP 30154 15.5 light-years
- HIP 31622 18.8 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.