NGC 1309 - Spiral Galaxy
NGC 1309 is a face-on spiral galaxy in the Eridanus Group, notable for its well-defined spiral arms and use in measuring cosmic expansion.
Distance: 100 million light-years
Apparent Magnitude: 11.50
Apparent Size: 3' × 2'
Constellation: Eridanus
Morphology: SA(s)bc (spiral)
Key Features:
- Face-on spiral structure
- Used in Hubble Key Project for distance calibration
- Cepheid variables measured
- Member of Eridanus Group
- Supernova observed in 2002
Best Imaging Season: October - February
Optimal Integration: 8+ hours
