Star · M2V
SDSS J074231.29+180816.5
SDSS J074231.29+180816.5 is a main-sequence star of spectral type M2V in the constellation Gemini, 136.3 light-years from the Sun.
| Constellation | Gemini |
|---|---|
| Distance | 136.3 light-years (41.8 pc) |
| Apparent magnitude | magnitude 21.37 |
| Absolute magnitude | magnitude 18.27 |
| Spectral type | M2V |
| Surface temperature | 3,320 K |
| Luminosity | 3.43 × 10⁻⁵ L☉ |
| Radius | 0.0177 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 7h 42m 31.3s |
| Declination (J2000) | +18° 08′ 16″ |
| Space velocity (relative to the Sun) | 17.7 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 21.37. Visible from the whole Northern Hemisphere and south to latitude 72° S. North of latitude 72° 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 1890. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.4 million years.
The Sun seen from there
From a planet around SDSS J074231.29+180816.5, the Sun would look like a star of magnitude 7.93, 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 36481 8.15 light-years
- HIP 37246 10.2 light-years
- HIP 35803 12.8 light-years
- SDSS J074007.30+200921.9 13.2 light-years
- HIP 38172 15.7 light-years
- ULAS J074720.07+245516.3 16.4 light-years
- SDSS J075656.54+231458.5 16.6 light-years
- HIP 37412 16.7 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.