Star · B5IV
HIP 1921
HIP 1921 is a subgiant star of spectral type B5IV in the constellation Cassiopeia, 1,325 light-years from the Sun.
| Constellation | Cassiopeia |
|---|---|
| Distance | 1,325 light-years (406.2 pc) |
| Apparent magnitude | magnitude 5.58 |
| Absolute magnitude | magnitude −2.46 |
| Spectral type | B5IV |
| Surface temperature | 11,740 K |
| Luminosity | 1,510 L☉ |
| Radius | 9.39 R☉ |
| Mass | 7.36 M☉ (estimated) |
| Right ascension (J2000) | 0h 24m 15.7s |
| Declination (J2000) | +52° 01′ 12″ |
| Space velocity (relative to the Sun) | 32.3 km/s |
In the sky
Visible to the naked eye under a dark sky (apparent magnitude 5.58). Visible from the whole Northern Hemisphere and south to latitude 38° S. North of latitude 38° N it never sets. It stands highest at midnight in September, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 701. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 23 million years.
The Sun seen from there
From a planet around HIP 1921, the Sun would look like a star of magnitude 12.87, in the direction where our sky has the constellation Centaurus. 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.