Galaxy · Spiral
NGC 7747
NGC 7747 is a galaxy in the direction of the constellation Pegasus, 358.4 million light-years away.
| Type | Spiral |
|---|---|
| Constellation | Pegasus |
| Distance | 358.4 million light-years (109.89 Mpc) |
| Diameter | 196,800 light-years · 2.3 × the Milky Way |
| Absolute magnitude | magnitude −22.19 |
| Apparent magnitude | magnitude 13.01 |
| Luminosity | 3.3 × the Milky Way |
| Right ascension (J2000) | 23h 45m 32.3s |
| Declination (J2000) | +27° 21′ 39″ |
| Source | 2MASS Redshift Survey (Huchra et al. 2012) |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.01. 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 September, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out 358 million years ago. At that time complex animals were spreading through the seas and over the land; there were no dinosaurs yet. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 6,358.0 billion years.