🔭 September Imaging Plan — Switzerland (46°N)

Optimized for your 400 mm, 700 mm, 1000 mm, 2000 mm rigs (APS‑C, color + narrowband)

🌄 400 mm f/5 — Widefield Autumn Nebulae & Andromeda

APS‑C FOV ≈ 3.2° × 2.1°

🎯 Best September Target: Andromeda Galaxy (M31)

Why this target fits 400 mm M31 is huge — at 400 mm you capture the full galaxy, dust lanes, and both satellite galaxies (M32 + M110).

Filters

• Color: Best for galaxies

• Narrowband: Not useful for M31

Exposure strategy

• 120–180 s RGB

• 6–10 h total integration

Expected result A crisp, widefield Andromeda with detailed dust lanes and bright core.

Secondary September target: Heart Nebula (IC 1805)

🌌 700 mm f/7 — Triangulum & Pacman

APS‑C FOV ≈ 1.8° × 1.2°

🎯 Best September Target: Triangulum Galaxy (M33)

Why this target fits 700 mm M33 is medium‑sized; 700 mm frames it perfectly with enough resolution to reveal Hα knots.

Filters

• Color: Main

• Narrowband: Optional Hα to highlight emission regions

Exposure strategy

• 180–240 s RGB

• 8–12 h total integration

• Optional: 240–300 s Hα for blending

Expected result A detailed M33 with visible spiral arms and pink Hα regions.

Secondary September target: Pacman Nebula (NGC 281)

🌠 1000 mm f/4 — Bubble & Pacman Core

APS‑C FOV ≈ 1.2° × 0.8°

🎯 Best September Target: Bubble Nebula (NGC 7635)

Why this target fits 1000 mm The Bubble is small enough that 1000 mm gives excellent detail while still capturing surrounding Hα clouds.

Filters

• Narrowband: Hα/OIII

• Color: Optional for stars

Exposure strategy

• 180–240 s NB

• 8–12 h total integration

Expected result A high‑contrast Bubble with visible shell structure and surrounding emission.

Secondary September target: Pacman Nebula core

🌑 2000 mm f/10 — Small Galaxies & Bubble Close‑ups

APS‑C FOV ≈ 0.6° × 0.4°

🎯 Best September Target: Bubble Nebula close‑up

Why this target fits 2000 mm At long focal length, you can resolve the Bubble’s shell thickness, internal turbulence, and the driving star.

Filters

• Narrowband: Hα/OIII mandatory

• Color: Optional

Exposure strategy

• 300–600 s NB

• 10–15 h total integration

Expected result A tight, high‑resolution Bubble with crisp edges and internal gradients.

Secondary September target: Small galaxies around M31

⭐ Your September Master Plan (Summary)