Target guide · globular cluster
M55 with a smart telescope
M55 is a globular cluster about 19 arcminutes (0.32°) across, magnitude 7. It is highest around midnight in July, best placed for the southern hemisphere, and bright enough to image from a suburb or even a city. Of the 12 smart telescopes we track, Odyssey, Odyssey Pro, Seestar S50 frame it best.
Key facts
| Catalogue | M55 |
|---|---|
| Type | globular cluster |
| Apparent size | 19′ × 19′ |
| Magnitude | 7 |
| Position (J2000) | RA 19.67 h, Dec -31.0° |
| Highest at midnight | July (±2 weeks) |
| Sky needed | City-friendly |
In the best-matching frame
Imaging tips
Globular clusters are bright and compact. Short sessions already give a good result from town; a narrower field of view shows more individual stars in the core. M55 is one of the easier targets from light-polluted skies.
Which smart telescope frames it best
| Telescope | Field of view | Fit |
|---|---|---|
| Unistellar Odyssey | 0.75° × 0.56° | fits well |
| Unistellar Odyssey Pro | 0.75° × 0.56° | fits well |
| ZWO Seestar S50 | 1.29° × 0.73° | fits well |
| Celestron Origin Mark II | 1.32° × 0.75° | fits well |
| DWARFLAB DWARF mini | 2.13° × 1.2° | fits well |
| ZWO Seestar S30 | 2.14° × 1.21° | fits well |
| ZWO Seestar S50 Pro | 2.45° × 1.38° | fits well |
| Vaonis Vespera II | 2.5° × 1.4° | fits well |
| Vaonis Vespera 3 | 2.5° × 1.4° | fits well |
| Vaonis Vespera Pro 2 | 1.6° × 1.6° | small in the frame |
| DWARFLAB DWARF 3 | 2.93° × 1.65° | small in the frame |
| ZWO Seestar S30 Pro | 3.99° × 2.24° | small in the frame |
How high it gets from where you live
Highest altitude above a flat horizon. Below about 20° the image suffers from haze and light pollution; trees and roofs often block it completely.
| Latitude | Highest altitude |
|---|---|
| Oslo, 60° N | never rises |
| Amsterdam, 52° N | 7° |
| Madrid, 40° N | 19° |
| Miami, 26° N | 33° |
| Equator | 59° |
| Sydney, 34° S | 87° |
Nearby in the sky
Objects close to M55 in the sky, so you can image them in the same session.
Questions and answers
- Can I photograph M55 from a city?
- Yes. It is bright enough to image from a suburb or even a city.
- Which smart telescope is best for M55?
- Odyssey, Odyssey Pro, Seestar S50 frame it best in a single frame, based on its size and each telescope's field of view.
- When is the best time to photograph M55?
- It is highest around midnight in July and best placed for the southern hemisphere. From 52° north it climbs to about 7° at most.