IC434

by gallikepler

Objects in field: Flame Nebula, Horsehead Nebula, NGC 1990, NGC 2023, NGC 2024, IC 431, IC 432, IC 434, IC 435, LDN 1630, LDN 1635, LDN 1636, LBN 935, LBN 940, LBN 944, LBN 946, LBN 950, LBN 953, LBN 954, LBN 958, LBN 962, LBN 965, Sh2-277, VdB50, VdB51, VdB52, 46 eps Ori, 46 Ori), 48 Ori, 48 sig Ori, 50 Ori), 50 zet Ori, Alnilam, Alnitak, B33, Orion, Orion B, Part of the constellation Orion (Ori), The star Alnilam (ε Ori, The star Alnitak (ζ Ori, The star σ Ori, VV Ori

Equipment: Takahashi FSQ-85EDX, QHYCCD QHY600PH M SBFL (Short back-focal length)

Integration: 8h 30m

Type: H II region (ionized hydrogen) Distance: ~1,300–1,500 light-years Illuminated by: Sigma Orionis , not Alnitak Emission mechanism: recombination of ionized hydrogen → 656.28 nm (H-alpha) IC 434 is a nearly edge-on ionization front — a sheet of hydrogen gas being ionized from one side by hot OB stars. Because we’re looking along the sheet, the emission appears bright, smooth, and vertically…