Star · M4V
SDSS J074007.30+200921.9
SDSS J074007.30+200921.9 is a main-sequence star of spectral type M4V in the constellation Gemini, 123.9 light-years from the Sun.
| Constellation | Gemini |
|---|---|
| Distance | 123.9 light-years (38.0 pc) |
| Apparent magnitude | magnitude 22.79 |
| Absolute magnitude | magnitude 19.89 |
| Spectral type | M4V |
| Surface temperature | 2,980 K |
| Luminosity | 1.74 × 10⁻⁵ L☉ |
| Radius | 0.0157 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 7h 40m 07.1s |
| Declination (J2000) | +20° 09′ 21″ |
| Space velocity (relative to the Sun) | 43.6 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 22.79. Visible from the whole Northern Hemisphere and south to latitude 70° S. North of latitude 70° N it never sets. It stands highest at midnight in January, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1902. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.2 million years.
The Sun seen from there
From a planet around SDSS J074007.30+200921.9, the Sun would look like a star of magnitude 7.73, in the direction where our sky has the constellation Sagittarius. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 37412 4.22 light-years
- HIP 36874 11.4 light-years
- SDSS J074231.29+180816.5 13.2 light-years
- HIP 38172 14.4 light-years
- HIP 39546 14.8 light-years
- ULAS J074720.07+245516.3 15.0 light-years
- HIP 38492 15.0 light-years
- HIP 36481 15.1 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.