Star · M4V
SDSS J204749.61-071818.3
SDSS J204749.61-071818.3 is a main-sequence star of spectral type M4V in the constellation Aquarius, 97.8 light-years from the Sun.
| Constellation | Aquarius |
|---|---|
| Distance | 97.8 light-years (30.0 pc) |
| Apparent magnitude | magnitude 24.45 |
| Absolute magnitude | magnitude 22.06 |
| Spectral type | M4V |
| Surface temperature | 2,980 K |
| Luminosity | 2.35 × 10⁻⁶ L☉ |
| Radius | 0.00577 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 20h 47m 49.6s |
| Declination (J2000) | −7° 18′ 18″ |
| Space velocity (relative to the Sun) | 34.6 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 24.45. Visible from the whole Southern Hemisphere and north to latitude 83° N. It stands highest at midnight in July, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1928. 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 SDSS J204749.61-071818.3, the Sun would look like a star of magnitude 7.22, in the direction where our sky has the constellation Cancer. It would be invisible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.