Star · M4V
2MASSI J2057153+171515
2MASSI J2057153+171515 is a main-sequence star of spectral type M4V in the constellation Delphinus, 189.2 light-years from the Sun.
| Constellation | Delphinus |
|---|---|
| Distance | 189.2 light-years (58.0 pc) |
| Apparent magnitude | magnitude 21.47 |
| Absolute magnitude | magnitude 17.65 |
| Spectral type | M4V |
| Surface temperature | 2,980 K |
| Luminosity | 1.36 × 10⁻⁴ L☉ |
| Radius | 0.044 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 20h 57m 15.4s |
| Declination (J2000) | +17° 15′ 15″ |
| Space velocity (relative to the Sun) | 24.4 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 21.47. Visible from the whole Northern Hemisphere and south to latitude 73° S. North of latitude 73° N it never sets. It stands highest at midnight in August, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1837. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 3.4 million years.
The Sun seen from there
From a planet around 2MASSI J2057153+171515, the Sun would look like a star of magnitude 8.65, in the direction where our sky has the constellation Hydra. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- HIP 103692 4.32 light-years
- HIP 102611 12.2 light-years
- HIP 103812 12.5 light-years
- HIP 104815 15.7 light-years
- HIP 101910 16.5 light-years
- HIP 104179 17.1 light-years
- HIP 105192 17.2 light-years
- HIP 105159 17.5 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.