M51 - Whirlpool Galaxy
The Whirlpool Galaxy is a classic face-on spiral galaxy interacting with its smaller companion NGC 5195. This interaction has enhanced star formation and created the galaxy's spectacular spiral structure.
Distance: 23 million light-years
Apparent Magnitude: 8.36
Apparent Size: 11' × 7'
Constellation: Canes Venatici
Morphology: SA(s)bc pec (grand design spiral)
Key Features:
- Classic grand design spiral structure
- Interacting with NGC 5195 (smaller companion)
- Enhanced star formation from tidal interaction
- Prominent dust lanes in spiral arms
- First galaxy recognized to have spiral structure (Lord Rosse, 1845)
Best Imaging Season: March - June
Optimal Integration: 10+ hours for structure
