Star · M0
GJ 9490B
GJ 9490B is a main-sequence star of spectral type M0 in the constellation Boötes, 70.4 light-years from the Sun.
| Other names | HIP 71914 |
|---|---|
| Constellation | Boötes |
| Distance | 70.4 light-years (21.6 pc) |
| Apparent magnitude | magnitude 9.10 |
| Absolute magnitude | magnitude 7.43 |
| Spectral type | M0 |
| Surface temperature | 4,140 K |
| Luminosity | 0.226 L☉ |
| Radius | 0.924 R☉ |
| Mass | 0.689 M☉ (estimated) |
| Right ascension (J2000) | 14h 42m 33.6s |
| Declination (J2000) | +19° 28′ 47″ |
| Space velocity (relative to the Sun) | 41.4 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 9.10. Visible from the whole Northern Hemisphere and south to latitude 71° S. North of latitude 71° N it never sets. It stands highest at midnight in April, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1956. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.2 million years.
The Sun seen from there
From a planet around GJ 9490B, the Sun would look like a star of magnitude 6.50, in the direction where our sky has the constellation Cetus. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- GJ 9490C 6.69 light-years
- GJ 9490A 6.69 light-years
- CWISEP J145837.91+173450.1 7.11 light-years
- HIP 72875 8.83 light-years
- GJ 3871 9.46 light-years
- GJ 3878A 10.3 light-years
- 2MASSW J1421314+182740 10.5 light-years
- HIP 72146 11.1 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.