Planetary Nebula, PK 164+31.
这个行星状星云非常暗,非常难拍,本人曾经用若岩天文台的TOA150+QHY9用Ha滤镜拍单张1200s,连个轮廓都看不清{:soso_e143:}
Due the low brightness this objet is not commonly imaged, even though it has a largish angular diameter to a planetary nebula. (6'.67" x 6'.67")
Processing work flow:
Image acquisition, MaxiDL v5.07.
Stacked and calibrated in CCDStack.
Deconvolution with a CCDSharp, 30 iterations.
Levels, curves and color combine in PS CS3.
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Telescope, Meade LX200 GPS 12" @ f5
Camera, QHY9
Guiding, SXV-AO @ 9Hz
Image Scale, 1,5 arcseconds/pixel
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Exposures:
H-alpha 14x1200s, binned 2x2 and 7x1200s, binned 3x3
O-III 2x600s, binned 4x4 and 1x1200s, binned 4x4
S-II 3x600s, binned 4x4 and 1x1200s, binned 4x4
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