Star · G0
GJ 1023A
GJ 1023A is a main-sequence star of spectral type G0 in the constellation Cassiopeia, 423.5 light-years from the Sun.
| Other names | HIP 4258 |
|---|---|
| Constellation | Cassiopeia |
| Distance | 423.5 light-years (129.9 pc) |
| Apparent magnitude | magnitude 9.18 |
| Absolute magnitude | magnitude 3.61 |
| Spectral type | G0 |
| Surface temperature | 5,940 K |
| Luminosity | 3.24 L☉ |
| Radius | 1.7 R☉ |
| Mass | 1.34 M☉ (estimated) |
| Right ascension (J2000) | 0h 54m 17.8s |
| Declination (J2000) | +69° 02′ 50″ |
| Space velocity (relative to the Sun) | 62.0 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 9.18. 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 1023A, 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.