Crescent Moon

This Moon crescent kept us company for much of the evening during our last field night. It set at 10 pm, giving us a couple of hours of darkness. We are heading for a Full Moon on Saturday, so I don’t expect to do any more deep sky imaging for a week or two, although I have one final image left to post from last week.

The Moon is always fun to shoot, especially as a crescent, so I took this image during twilight, before the sky was dark enough for deep sky imaging.

The image is  a stack of the best 250 of 500 video frames and as I was set up for deep sky imaging, I had my light pollution filter in place instead of a moon filter. Probably that was not a good idea for lunar shots – but it is what it is.

The video was processed in PIPP and converted to AVI, before stacking the best 50% of frames in Autostackert and a final bit of sprucing up in GIMP.

Object Details:

Apparent size:  32.7′
Age: New Moon + 4 days.
Visual magnitude:  -7.7
Illumination: 21.0%
Altitude during exposure:  34°

Did You Know?

The Moon’s mass is 1.23% of Earth and it’s surface gravity is 16.54% that of Earth.


Here is some technical stuff.


Frames: best 50% of 500.
Exposure:  0.065849 sec.
Gain: 0
Date:  2019-09-03
Location:  semi-dark rural.
Cropping:   Yes


Image acquisition:  SharpCap.
Method:  video.
Video conversion:  PIPP.
Image stacking:  Autostackert.
Image post-processing:  GIMP.


Telescope: SkyWatcher Esprit  Type: 120ED triplet refractor
Focal: 840 mm F/7 Mount: SkyWatcher EQ6-R Pro
Camera: ZWO ASI 071 MC Pro
Type: CMOS 28.4mm 16 Mpx
Optical aids: Flattener: Y; filter: LP

Geek Log:

[ZWO ASI071MC Pro]
Debayer Preview=On
Output Format=SER file (*.ser)
Capture Area=4944×3284
Colour Space=RAW16
Hardware Binning=Off
Turbo USB=40
Frame Rate Limit=1 every 2 seconds
Timestamp Frames=Off
White Bal (B)=50
White Bal (R)=53
Cooler Power=78

Target Temperature=-15
Auto Exp Max Gain=300
Auto Exp Max Exp M S=30000
Auto Exp Target Brightness=100

Mono Bin=Off
Anti Dew Heater=Off
Banding Threshold=35
Banding Suppression=0
Apply Flat=None
Subtract Dark=None
#Black Point
Display Black Point=0
#MidTone Point
Display MidTone Point=0.5
#White Point
Display White Point=1

Image © Roger Powell


  1. We volunteer weekly with a class of English language learners. Last Wednesday, the skies were perfect. I invited them to a viewing party to see the Moon, Jupiter, and Saturn through a telescope. About 10 people showed up, some I had never seen before. I enjoyed the comments about how beautiful were the views.

    Liked by 1 person

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