Star · M2.5 V
G 9-40
G 9-40 is a main-sequence star of spectral type M2.5 V in the constellation Cancer, 90.8 light-years from the Sun. It is orbited by 1 confirmed exoplanet(s).
| Constellation | Cancer |
|---|---|
| Distance | 90.8 light-years (27.8 pc) |
| Apparent magnitude | magnitude 13.86 |
| Absolute magnitude | magnitude 11.64 |
| Spectral type | M2.5 V |
| Surface temperature | 3,400 K |
| Luminosity | 0.011 L☉ |
| Radius | 0.303 R☉ |
| Mass | 0.295 M☉ |
| Age | 9.9 billion years |
| Metallicity [Fe/H] | -0.07 |
| Right ascension (J2000) | 8h 58m 52.5s |
| Declination (J2000) | +21° 04′ 29″ |
| Space velocity (relative to the Sun) | 47.9 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.86. Visible from the whole Northern Hemisphere and south to latitude 69° S. North of latitude 69° N it never sets. It stands highest at midnight in February, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1935. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.6 million years.
The Sun seen from there
From a planet around G 9-40, the Sun would look like a star of magnitude 7.05, in the direction where our sky has the constellation Capricornus. It would be invisible to the naked eye.
Planets
- G 9-40 b 5.75-day orbit · 1.9 R⊕
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- Gl 343 10.8 light-years
- SDSS J083506.16+195304.4 11.7 light-years
- 2MASSI J0856479+223518 12.5 light-years
- GJ 3540 12.8 light-years
- SDSS J092308.70+234013.7 14.0 light-years
- GJ 3531 14.4 light-years
- ULAS J081918.58+210310.4 14.6 light-years
- GJ 3548A 14.7 light-years
Stellar parameters from the NASA Exoplanet Archive; position and brightness from the HYG / AT-HYG catalogue.