The Triangulum Galaxy and its Nebulas
November 12, 2025
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As discussed in the description of the image of Messier 33 (M33), the Triangulum Galaxy, M33 contains a number of star-forming regions so large, and so visible from Earth-based telescopes that they have their own NGC numbers.
Obviously, I cannot achieve what the Hubble Space Telescope achieves from 400 miles above the Earth’s surface. But I’m still amazed I can do as well as this with a six-inch refractor in New Mexico.
The biggest player in this list of M33 nebulas is NGC 604—perhaps the largest known HII star-forming region. More than 50 times the size of the Great Orion Nebula in our own galaxy, it contributes to M33’s prodigious star-forming rate, which is ten times that of the much larger Andromeda Galaxy.
Takahashi TOA130
Telescope
Finder Chart
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Total integration: 200h 37m
Integration per filter:
- Lum: 11h 50m (710 × 60")
- Lum: 21h 27m (429 × 180")
- R: 5h 59m (359 × 60")
- R: 16h 18m (326 × 180")
- G: 5h 56m (356 × 60")
- G: 16h 21m (327 × 180")
- B: 5h 44m (344 × 60")
- B: 16h 30m (330 × 180")
- Hα: 7h 21m (147 × 180")
- Hα: 26h 20m (158 × 600")
- SII: 7h 33m (151 × 180")
- SII: 26h 10m (157 × 600")
- OIII: 6h 48m (136 × 180")
- OIII: 26h 20m (158 × 600")
Coordinates: 1h 33m 53s · +30° 39′ 18″
Image Capture
Location:
Deep Sky West
Camera:
Moravian C5a-100M
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