Galaxy · Spiral
IC 1731
IC 1731 is a galaxy in the direction of the constellation Triangulum, 163.2 million light-years away.
| Type | Spiral |
|---|---|
| Constellation | Triangulum |
| Distance | 163.2 million light-years (50.04 Mpc) |
| Diameter | 105,000 light-years · 1.2 × the Milky Way |
| Absolute magnitude | magnitude −19.79 |
| Apparent magnitude | magnitude 13.71 |
| Luminosity | 0.36 × the Milky Way |
| Right ascension (J2000) | 1h 50m 12.3s |
| Declination (J2000) | +27° 11′ 46″ |
| Source | 2MASS Redshift Survey (Huchra et al. 2012) |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.71. Visible from the whole Northern Hemisphere and south to latitude 63° S. North of latitude 63° N it never sets. It stands highest at midnight in October, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out 163 million years ago. At that time dinosaurs ruled the Earth. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 2,895.2 billion years.