Star · ?
GJ 3540
GJ 3540 is a main-sequence star of spectral type ? in the constellation Cancer, 95.1 light-years from the Sun.
| Constellation | Cancer |
|---|---|
| Distance | 95.1 light-years (29.1 pc) |
| Apparent magnitude | magnitude 12.29 |
| Absolute magnitude | magnitude 9.97 |
| Spectral type | ? |
| Surface temperature | 3,710 K |
| Luminosity | 0.0366 L☉ |
| Radius | 0.464 R☉ |
| Mass | 0.438 M☉ (estimated) |
| Right ascension (J2000) | 9h 12m 03.2s |
| Declination (J2000) | +27° 54′ 28″ |
| Space velocity (relative to the Sun) | 67.6 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 12.29. Visible from the whole Northern Hemisphere and south to latitude 62° S. North of latitude 62° 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 1931. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 1.7 million years.
The Sun seen from there
From a planet around GJ 3540, the Sun would look like a star of magnitude 7.15, in the direction where our sky has the constellation Microscopium. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- 75 Cnc 7.26 light-years
- SDSS J093113.23+280227.1 12.1 light-years
- HIP 43410 12.8 light-years
- G 9-40 12.8 light-years
- 2MASSI J0856479+223518 13.5 light-years
- 2MASSW J0920122+351742 14.3 light-years
- GJ 3548A 14.4 light-years
- HIP 47261 14.7 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.