Visualization of star movement in the NGC 7331 Group area

A place to share images that you have taken with SharpCap.
Forum rules
Please upload large images to photo sharing sites (flickr, etc) rather than trying to upload them as forum attachments.

Please share the equipment used and if possible camera settings to help others.
Post Reply
User avatar
Menno555
Posts: 280
Joined: Mon Apr 20, 2020 2:19 pm
Location: The Netherlands
Contact:

Visualization of star movement in the NGC 7331 Group area

Post by Menno555 »

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

Image

Image
umasscrew39
Posts: 377
Joined: Fri Apr 28, 2017 1:28 pm
Location: Central Florida
Contact:

Re: Visualization of star movement in the NGC 7331 Group area

Post by umasscrew39 »

Very clever and great animation. Terrific demonstration. Thanks for sharing.

Bruce
User avatar
Menno555
Posts: 280
Joined: Mon Apr 20, 2020 2:19 pm
Location: The Netherlands
Contact:

Re: Visualization of star movement in the NGC 7331 Group area

Post by Menno555 »

Thanks Bruce!
This kind of stuff is so cool to do :)

Menno
User avatar
turfpit
Posts: 1289
Joined: Mon Feb 13, 2017 8:13 pm
Location: UK
Contact:

Re: Visualization of star movement in the NGC 7331 Group area

Post by turfpit »

Very interesting Menno.

Dave
User avatar
oopfan
Posts: 769
Joined: Sat Jul 08, 2017 2:37 pm
Location: New York
Contact:

Re: Visualization of star movement in the NGC 7331 Group area

Post by oopfan »

Excellent work, Menno!

If you are interested here is a list of High Proper Motion stars:
https://www.cosmos.esa.int/web/hipparco ... per-motion

At the top of the list is Barnard's Star at a rate of 10.3 arc-seconds per year
https://www.cosmos.esa.int/web/hipparco ... tion-stars
https://en.wikipedia.org/wiki/Barnard's_Star

Barnard's Star is in northeast Ophiuchus so you need to hurry to get a baseline image to compare with next year.
I've attached a star chart and visibility plot. For my latitude (New York City area) it is at 40 degrees altitude at the beginning of astronomical darkness.

Brian
Barnards Star chart.jpg
Barnards Star chart.jpg (282.48 KiB) Viewed 320 times
Barnards Star visibility.jpg
Barnards Star visibility.jpg (118.26 KiB) Viewed 320 times
User avatar
Menno555
Posts: 280
Joined: Mon Apr 20, 2020 2:19 pm
Location: The Netherlands
Contact:

Re: Visualization of star movement in the NGC 7331 Group area

Post by Menno555 »

Thanx for the links and heads up Brian!
Not really interested (yet) but of course gonna read it. Knowledge is power (kinda) ;)
For me Barnard's Star is now kinda low but I'll keep it mind.

Menno
Post Reply