Tuesday, April 22, 2025
A Planetary Nebula Purgathofer-Weinberger 1 (PuWe1) is the Last Photo for Now
I spent total 36 hours of collecting 20 min. exposures for this cosmic smoke ring with narrowband filters, H-alpha, S-II and O-III. PuWe1 locates in constellation lynx at distance of about 1300 light years.
This is my last new photo for the imaging season 2024-25, we ran out of the astronomical darkens at May 7. Deep sky imaging is possible again after the first week of September. up here 65N.
PuWe1
Click for a large image, 2000 x 2000 pixels
A mapped color image from a light emitted by an ionized elements, sulfur=red, hydrogen=green and oxygen=blue. Original resolution 6500 x 6500 pixels
A Closeup
Click for a large image, 1600 x 1600 pixels
Image in visual colors
Click for a large image, 2000 x 2000 pixels
The emission from H-alpha and S-II are seen as red, blueish tones are from an emission of ionized oxygen, O-III. This combination is very close to a visual colors of the nebula.
A size comparison between M27 and PuWe1
Click for a large image, 2000 x 2300 pixels
Note, a size of the Full Moon is marked as a white circle as a scale.
The apparent size of the Full Moon in the sky is 30 arc minutes (0,5 degrees)
Technical details
Processing workflow
Image acquisition, MaximDL v6.5
Stacked and calibrated in CCDStack2.
Deconvolution with a CCDStack2 Positive Constraint, 27 iterations, added at 50% weight
Color combine in PS
Levels and curves in PS
Imaging optics,
Celestron EDGE 14" with 0.7 Focal reducer
Mount,
MesuMount Mark II
Cameras,
Imaging camera Apogee Alta U9000M and Apogee seven slot filter wheel
Guider camera, Lodestar x 2 and SXV-AO Active Optics @ 5hz
filters,
Astrodon 5nm H-alpha, 3nm S-II and 3nm O-III
Total exposure time 36h
H-alpha, 72 x 1200 s, binned 1x1 = 24 h
O-III, 6x 1200 s, binned 2x2 = 6h
O-III, 6x 1200 s, binned 2x2 = 6h
S-II, 6 x 1200 s. binned 2x2 = 6h
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