Galaxy · Spiral
IC 4821
IC 4821 is a galaxy in the direction of the constellation Telescopium, 125.9 million light-years away.
| Type | Spiral |
|---|---|
| Constellation | Telescopium |
| Distance | 125.9 million light-years (38.61 Mpc) |
| Diameter | 72,200 light-years · 0.83 × the Milky Way |
| Absolute magnitude | magnitude −19.68 |
| Apparent magnitude | magnitude 13.25 |
| Luminosity | 0.33 × the Milky Way |
| Right ascension (J2000) | 19h 09m 32.0s |
| Declination (J2000) | −55° 01′ 02″ |
| Source | 2MASS Redshift Survey (Huchra et al. 2012) |
In the sky
A telescope is needed to see it: its apparent magnitude is 13.25. Visible from the whole Southern Hemisphere and north to latitude 35° N. South of latitude 35° S it never sets. It stands highest at midnight in July, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out 126 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 2,233.9 billion years.