M33
LRGB
M 33 - Triangulum Galaxy
October 2025
The Triangulum Galaxy (Messier 33, NGC 598) is a spiral galaxy located about 2.73 million light-years from Earth in the constellation Triangulum, making it the third-largest member of the Local Group after the Andromeda Galaxy (M31) and the Milky Way. Its diameter of roughly 60,000 light-years makes it about half the size of our own galaxy. M33 hosts extensive Ha regions—large clouds of ionized hydrogen gas—where intense star formation is occurring, most notably NGC 604, one of the largest known stellar nurseries in the Local Group.
Target Information
- Catalog ID
- M 33★
- Common Name
- Triangulum Galaxy
- Constellation
- Triangulum
- Object Type
- Galaxy
- RA
- 1h 33m 54s
- Dec
- +30° 41′ 35″
- Field of View
- 1.73° × 1.18°
Acquisition Data
12h 12m total| Filter | Frames | Exp | Subtotal |
|---|---|---|---|
| Lum | 152 | 90s | 3h 48m |
| R | 60 | 90s | 1h 30m |
| G | 60 | 90s | 1h 30m |
| B | 59 | 90s | 1h 28m |
| Hα | 59 | 240s | 3h 56m |
Equipment
Starfront - Redcat 91 · Starfront Observatories · Bortle 1
Telescope
Camera
Mount
Filters
Accessories
Guiding Optic
Guiding Camera