Star · G2V
GJ 1023B
GJ 1023B is a main-sequence star of spectral type G2V in the constellation Cassiopeia, 423.8 light-years from the Sun.
| Constellation | Cassiopeia |
|---|---|
| Distance | 423.8 light-years (129.9 pc) |
| Apparent magnitude | magnitude 10.40 |
| Absolute magnitude | magnitude 4.83 |
| Spectral type | G2V |
| Surface temperature | 5,820 K |
| Luminosity | 1.08 L☉ |
| Radius | 1.02 R☉ |
| Mass | 1.02 M☉ (estimated) |
| Right ascension (J2000) | 0h 54m 19.0s |
| Declination (J2000) | +69° 02′ 52″ |
| Space velocity (relative to the Sun) | 69.3 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 10.40. Visible from the whole Northern Hemisphere and south to latitude 21° S. North of latitude 21° N it never sets. It stands highest at midnight in October, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1602. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 7.5 million years.
The Sun seen from there
From a planet around GJ 1023B, the Sun would look like a star of magnitude 10.40, in the direction where our sky has the constellation Musca. 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.