Star · B5I
HIP 99145
HIP 99145 is a supergiant star of spectral type B5I in the constellation Cygnus, 4,068 light-years from the Sun.
| Constellation | Cygnus |
|---|---|
| Distance | 4,068 light-years (1,247 pc) |
| Apparent magnitude | magnitude 6.12 |
| Absolute magnitude | magnitude −4.36 |
| Spectral type | B5I |
| Surface temperature | 8,870 K |
| Luminosity | 5,540 L☉ |
| Radius | 31.5 R☉ |
| Mass | 10.7 M☉ (estimated) |
| Right ascension (J2000) | 20h 07m 41.4s |
| Declination (J2000) | +34° 25′ 22″ |
| Space velocity (relative to the Sun) | 35.4 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 6.12). Visible from the whole Northern Hemisphere and south to latitude 56° S. North of latitude 56° N it never sets. It stands highest at midnight in July, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out 4,068 years ago. At that time the first farming villages were being founded; there was no writing yet. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 72 million years.
The Sun seen from there
From a planet around HIP 99145, the Sun would look like a star of magnitude 15.31, in the direction where our sky has the constellation Puppis. 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.