Star · M1V
SDSS J081757.49+182405.0
SDSS J081757.49+182405.0 is a main-sequence star of spectral type M1V in the constellation Cancer, 139.2 light-years from the Sun.
| Constellation | Cancer |
|---|---|
| Distance | 139.2 light-years (42.7 pc) |
| Apparent magnitude | magnitude 21.55 |
| Absolute magnitude | magnitude 18.40 |
| Spectral type | M1V |
| Surface temperature | 3,400 K |
| Luminosity | 2.58 × 10⁻⁵ L☉ |
| Radius | 0.0147 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 8h 17m 57.5s |
| Declination (J2000) | +18° 24′ 05″ |
| Space velocity (relative to the Sun) | 75.1 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 21.55. 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 1887. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2.5 million years.
The Sun seen from there
From a planet around SDSS J081757.49+182405.0, the Sun would look like a star of magnitude 7.98, in the direction where our sky has the constellation Capricornus. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- SDSS J082642.65+193922.0 5.92 light-years
- HIP 40420 8.59 light-years
- 25 Cnc 10.9 light-years
- Asellus Australis 15.5 light-years
- HIP 41226 15.9 light-years
- HIP 39515 17.4 light-years
- SDSS J075656.54+231458.5 17.6 light-years
- ULAS J082155.49+250939.6 18.6 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.