Galaxy · Barred spiral
M91
M91 is a galaxy in the direction of the constellation Coma Berenices, 50.7 million light-years away.
| Type | Barred spiral |
|---|---|
| Constellation | Coma Berenices |
| Distance | 50.7 million light-years (15.53 Mpc) |
| Diameter | 103,300 light-years · 1.2 × the Milky Way |
| Absolute magnitude | magnitude −20.95 |
| Apparent magnitude | magnitude 10.01 |
| Luminosity | 1 × the Milky Way |
| Right ascension (J2000) | 12h 35m 26.4s |
| Declination (J2000) | +14° 29′ 47″ |
| Source | 2MASS Redshift Survey (Huchra et al. 2012) |
In the sky
A telescope is needed to see it: its apparent magnitude is 10.01. Visible from the whole Northern Hemisphere and south to latitude 76° S. North of latitude 76° N it never sets. It stands highest at midnight in March, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out 51 million years ago. At that time the dinosaurs were gone and mammals were diversifying; there was no human lineage yet. At the speed of Voyager 1, the fastest craft leaving the Solar System (16.9 km per second), the trip would take 898.5 billion years.