Galaxy · Spiral
ESO 154-023
ESO 154-023 is a galaxy in the direction of the constellation Horologium, 18.1 million light-years away.
| Type | Spiral |
|---|---|
| Constellation | Horologium |
| Distance | 18.1 million light-years (5.55 Mpc) |
| Diameter | 41,500 light-years · 0.47 × the Milky Way |
| Absolute magnitude | magnitude −16.90 |
| Apparent magnitude | magnitude 11.82 |
| Luminosity | 0.025 × the Milky Way |
| Right ascension (J2000) | 2h 56m 50.4s |
| Declination (J2000) | −54° 34′ 23″ |
| Source | Updated Nearby Galaxy Catalog (Karachentsev et al. 2013) |
In the sky
A telescope is needed to see it: its apparent magnitude is 11.82. 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 November, the best time to observe it.
Through a telescope from Earth
Light's journey
The light you see tonight set out 18 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 321.1 billion years.