Galaxy · Spiral
IC 5145
IC 5145 is a galaxy in the direction of the constellation Pegasus, 342.7 million light-years away.
| Type | Spiral |
|---|---|
| Constellation | Pegasus |
| Distance | 342.7 million light-years (105.07 Mpc) |
| Diameter | 194,800 light-years · 2.2 × the Milky Way |
| Absolute magnitude | magnitude −22.38 |
| Apparent magnitude | magnitude 12.73 |
| Luminosity | 3.9 × the Milky Way |
| Right ascension (J2000) | 21h 54m 23.1s |
| Declination (J2000) | +15° 09′ 24″ |
| Source | 2MASS Redshift Survey (Huchra et al. 2012) |
In the sky
A telescope is needed to see it: its apparent magnitude is 12.73. Visible from the whole Northern Hemisphere and south to latitude 75° S. North of latitude 75° N it never sets. It stands highest at midnight in August, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out 343 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 6,079.1 billion years.