Star · M3V
2MASSI J1721039+334415
2MASSI J1721039+334415 is a main-sequence star of spectral type M3V in the constellation Hercules, 52.8 light-years from the Sun.
| Constellation | Hercules |
|---|---|
| Distance | 52.8 light-years (16.2 pc) |
| Apparent magnitude | magnitude 21.09 |
| Absolute magnitude | magnitude 20.04 |
| Spectral type | M3V |
| Surface temperature | 3,150 K |
| Luminosity | 9.68 × 10⁻⁶ L☉ |
| Radius | 0.0105 R☉ |
| Mass | 0.075 M☉ (estimated) |
| Right ascension (J2000) | 17h 21m 01.3s |
| Declination (J2000) | +33° 44′ 26″ |
| Space velocity (relative to the Sun) | 149.5 km/s |
In the sky
A telescope is needed to see it: its apparent magnitude is 21.09. Visible from the whole Northern Hemisphere and south to latitude 56° S. North of latitude 56° N it never sets. It stands highest at midnight in June, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out around the year 1973. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 937 thousand years.
The Sun seen from there
From a planet around 2MASSI J1721039+334415, the Sun would look like a star of magnitude 5.88, in the direction where our sky has the constellation Columba. It would be visible to the naked eye.
Neighbours
Its nearest neighbours in the catalogue (within 20 light-years):
- 72 Her 5.34 light-years
- WISEPA J180435.40+311706.1 8.73 light-years
- WISE J174303.71+421150.0 9.23 light-years
- 99 Her 9.40 light-years
- GJ 3966 9.64 light-years
- GJ 4026 10.1 light-years
- Gl 626.2 10.2 light-years
- GJ 4003 11.3 light-years
Position, brightness and colour from the HYG / AT-HYG catalogue; temperature, luminosity, radius and mass are approximate values computed from these observations.