Galaxy · Spiral
NGC 7718
NGC 7718 is a galaxy in the direction of the constellation Pegasus, 440.0 million light-years away.
| Type | Spiral |
|---|---|
| Constellation | Pegasus |
| Distance | 440.0 million light-years (134.90 Mpc) |
| Diameter | 155,600 light-years · 1.8 × the Milky Way |
| Absolute magnitude | magnitude −22.08 |
| Apparent magnitude | magnitude 13.57 |
| Luminosity | 3 × the Milky Way |
| Right ascension (J2000) | 23h 38m 05.0s |
| Declination (J2000) | +25° 43′ 11″ |
| Source | 2MASS Redshift Survey (Huchra et al. 2012) |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.57. Visible from the whole Northern Hemisphere and south to latitude 64° S. North of latitude 64° 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 440 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 7,805.0 billion years.