Visualization of star movement in the NGC 7331 Group area
Posted: Tue Oct 13, 2020 3:13 pm
Visualization of star movement in the NGC 7331 Group area (Deer Lick Group)
I did see this idea somewhere else, so of course I had to try this ... and it works great
For us stars look like static objects but in fact they are moving. Giving a long enough time period, that movement can be visualized.
This GIF animation below shows stars moving. I overlayed my capture (8" Meade ACF SCT) of the NGC 7331 group (Deer Lick Group) from September 2020 on a capture (48" Oschin Schmidt) of the Polamar Telescope from August 1953.
So there is 67 years difference and it shows at least 50 stars moving in that time frame in a 30 x 23 arcmin area.
I also made an image with the stars that move indicated. There are probably more but the overlay of the 2 captures is not perfect: differences in sky quality, equipment, and so on are causing a small random shift. But the indicated stars are 100% moving, anything else is not certain.
The Palomar capture is acquired from https://archive.stsci.edu/cgi-bin/dss_form
My capture:
Bortle 7/8
Meade LX65 8" f/10 ACF OTA
Ioptron CEM25EC mount (no guiding)
Baader Neodymium SkyGlow filter
Zwo ASI294MC Pro camera
Captured with SharpCap Pro
45 x 60 sec + 70 x 120 sec / @ -20 degrees Celsius / Gain 120 / Offset 4 / White balance R50/B50
Stacked in DeepSkyStacker
Processed in SiriL and Photoshop
Siril: Histogram and Color Calibration
Photoshop: black/white conversion, Levels, Curves.
Positioning of the Palomar capture over my capture
Animated GIF made with Microsoft GIFAnimator
I did see this idea somewhere else, so of course I had to try this ... and it works great
For us stars look like static objects but in fact they are moving. Giving a long enough time period, that movement can be visualized.
This GIF animation below shows stars moving. I overlayed my capture (8" Meade ACF SCT) of the NGC 7331 group (Deer Lick Group) from September 2020 on a capture (48" Oschin Schmidt) of the Polamar Telescope from August 1953.
So there is 67 years difference and it shows at least 50 stars moving in that time frame in a 30 x 23 arcmin area.
I also made an image with the stars that move indicated. There are probably more but the overlay of the 2 captures is not perfect: differences in sky quality, equipment, and so on are causing a small random shift. But the indicated stars are 100% moving, anything else is not certain.
The Palomar capture is acquired from https://archive.stsci.edu/cgi-bin/dss_form
My capture:
Bortle 7/8
Meade LX65 8" f/10 ACF OTA
Ioptron CEM25EC mount (no guiding)
Baader Neodymium SkyGlow filter
Zwo ASI294MC Pro camera
Captured with SharpCap Pro
45 x 60 sec + 70 x 120 sec / @ -20 degrees Celsius / Gain 120 / Offset 4 / White balance R50/B50
Stacked in DeepSkyStacker
Processed in SiriL and Photoshop
Siril: Histogram and Color Calibration
Photoshop: black/white conversion, Levels, Curves.
Positioning of the Palomar capture over my capture
Animated GIF made with Microsoft GIFAnimator
