Jump to content

Stargazers Lounge Uses Cookies

Like most websites, SGL uses cookies in order to deliver a secure, personalised service, to provide social media functions and to analyse our traffic. Continued use of SGL indicates your acceptance of our cookie policy.

stargazine_ep8_banner.thumb.jpg.7fc4114c7705b14c0786cf342cea1f9c.jpg

Galen Gilmore

Image Change Detection Software?

Recommended Posts

Anybody know of a piece of software that could detect the change the occurred in an image? I'm doing a project to see if I can find an asteroid or comet without any prior knowledge of where said asteroid/comet is.

I'm not really sure where to look for something like this, so any help would be appreciated.

Also, I would like something that could run on Mac. But I'll run it on bootcamp if there is no other options.

Thanks.

Share this post


Link to post
Share on other sites

To help identify variable stars and similar changing objects I use a solved image (astrometry.net). This provides a accurate reference frame for the image which can then be "blinked" against a detailed star map - I use the features of Cartes du Ciel.

Any "new" star - asteroid or comet will show during the blink as having no matching star image on the underlying star chart. You can set the search limit magnitude to make things easier...

Hope that helps.

 

CdC_blink1.JPG

CdC_blink2.JPG

  • Thanks 1

Share this post


Link to post
Share on other sites

Ken has a good method but if you want to analyse and "blink" images to discover quickly moving objects, I have seen good results with Astrometrica - http://www.astrometrica.at/

It is quite old so have a look to see if you can get it to work on your Mac.

 

Stu

  • Thanks 1

Share this post


Link to post
Share on other sites
1 hour ago, Merlin66 said:

To help identify variable stars and similar changing objects I use a solved image (astrometry.net). This provides a accurate reference frame for the image which can then be "blinked" against a detailed star map - I use the features of Cartes du Ciel.

Any "new" star - asteroid or comet will show during the blink as having no matching star image on the underlying star chart. You can set the search limit magnitude to make things easier...

Hope that helps.

 

CdC_blink1.JPG

CdC_blink2.JPG

Interesting idea, this actually removes the need to take multiple pictures of the same area of the sky, right? 

Thanks, I’ll try it.

Share this post


Link to post
Share on other sites

I think in order to have your discovery verifiable by the MPC etc, you will need to submit images and precise astrometry of your object.

Also, blinking different images is how nova outbursts, supernovae etc are discovered, so, you really need to take images. This isn't difficult however.

Stu

  • Thanks 1

Share this post


Link to post
Share on other sites

Astrometrica does the job ....

I found that it took me quite a while to get used to how it works .... but it is worthwhile once you understand how to use it.

I have been tracking some faint asteroids recently and found out that my scope & camera needs to have exposures 500 sec and upwards in order to easily spot objects fainter than mag16.

Mike

  • Thanks 1

Share this post


Link to post
Share on other sites
11 hours ago, Stu Todd said:

I think in order to have your discovery verifiable by the MPC etc, you will need to submit images and precise astrometry of your object.

Also, blinking different images is how nova outbursts, supernovae etc are discovered, so, you really need to take images. This isn't difficult however.

Stu

I'm not really planning on trying to discover any, that is likely out of the reach of my equipment. This is just a little project/experiment I'm doing to learn about this kind of astronomy.

Share this post


Link to post
Share on other sites

No, fair enough, it was more of an example of why there is a need to take multiple images, regardless of your level. 

Hope you find some bright ones to practise on.

 

Stu

  • Like 1

Share this post


Link to post
Share on other sites

Incase anybody is still on this thread, I have made a youtube video documenting what I did on the first night.

 

Share this post


Link to post
Share on other sites

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Recently Browsing   0 members

    No registered users viewing this page.

  • Similar Content

    • By teoria_del_big_bang
      I am sure there are loads of these polls but there seems so many available now I was wondering what, and why, people are using them.
      Poll is set to close end of August so it doesn't go on running forever.
      Thanks for participating
      Steve
    • By Adaaam75
      Hi guys,
      So on Tuesday night I spent the evening imaging the moon with my Celestron 9.25 SCT and DSLR as shown below and am happy with the images I collated (I only took images as I did intend to take capture video but I got carried away and time was getting on).
      I have approx 350 jpeg (and the equivalent in raw) images and have used the Microsoft image composite editor to stitch the frames together without editing them first etc but I wonder if I'm going the images an injustice?
      I'm not ready to pay for editing software as I know there is a lot of very good free downloads out there and I'm asking for recommendations. Should I be processing the frames before/after stitching and what software would you recommend? Please offer any advice you have.
      I will post the resulting image once I'm happy with the outcome 😁
      Thanks in advance,
       

    • By deufrai
      Hi everyone
      I am a proud member of a team working on a multi-platform live stacking solution : ALS (Astro Live Stacker => https://als-app.org)

      It runs fine on PC (GNU/Linux and Windows 7 to 10), OSX and RaspBerry.
      Current stable version is very basic : Polling a folder to detect new images (any FITS or DSLR RAW) then align + stack (Mean or Sum) + autostrech + levels + RGB balance.
      ALS also has a built-in webserver so your pals at the astroclub can see the results, provided everyone is on the same network.
      We are working hard on new features like Dark subtraction + Hot pixel removal and are providing nightly builds for you guys to try it out. Check out https://als-app.org/nightlies/
      Handling image capture directly inside ALS using INDI protocol is on our roadmap too. check out our Github repo to know more about it
      If you could give it a try and help us make ALS a fun & easy way to see and share all those wonders above our heads, that would be much appreciated !
      Clear skies to all !
      -- 
      Fred
    • By John
      I've had a lovely session with my Takahashi 100mm refractor tonight. Particularly enjoyable because of the awful weather we seem to have had for the past month - a clear and reasonably dark sky for a decent period seems a real novelty !
      I've observed a wide range of targets from Venus at dusk out to galaxies "far, far away". The distant gas giant Uranus, binary stars, star clusters, star formation nebulae, planetary nebulae and super nova remnants have also been visited and admired over the past few hours.
      I don't generally observe asteroids that often but tonight one of the largest in the asteroid belt, 4 Vesta, was conveniently positioned in Cetus near the 4th magnitude star Mu Cetus. At magnitude 7.7 4 Vesta was not easy to pick out in the 6x30 optical finder that I was using but the star hop from Mu Cetus was pretty simple so I had no difficulty identifying the star-like point of light amongst a distinct field of background stars. This is the Stellarium view of 4 Vestas position tonight:

      And a point of light is all that 4 Vesta appears as in the scope, even at high magnifications. While it is a giant among asteroids, 4 Vesta is a mere 550km or so in diameter and currently a bit over 300,000,000 km from Earth. Stellarium estimates its apparent diameter at .3 of an arc second. I don't know how accurate that is but my 100mm refractor was not going to show its disk, thats for sure !
      Despite the modesty of its visual appearance, I was very happy to be observing this little worldlet during its 3.6 year journey around the Sun.
      A few years ago NASAs DAWN spacecraft visited 4 Vesa and produced some outstanding imagery such as this example showing the whole asteroid in all its scarred glory. 4 Vesta has clearly been though a lot in it's 4.6 billion year existance:

      Now one of my other astro-related interests is meteorites. I currently have a small collection of specimens of the main types built up over the past 12 months or so. Three of my samples are small representatives of a group of meteorites known as HEDs - an abbreviation for Howardite, Eucrite and Diogenite. These are types of achondrite meteorites so were formed through melting and recrystalisation of igneous rocks.
      The exciting thing about the HED group of metorites is that we are now fairly certain that they originated from the asteroid 4 Vesta !.
      So I thought it would be fun to include some photos of my little specimens of 4 Vesta in this report. Perhaps one day a sample return mission will bring back some material from 4 Vesta so that it can be compared with the meteoric samples that we have ?
      Here are some pictures of my specimens of these 3 types. The green cube is 1 cm square for scale - these are small pieces of rock !
      Of these 3, only the Tatahouine Meteorite (the greenish one) was actually seen to fall. The other 2 were finds in the north african desert regions. Small fragments of that distant body that I was observing earlier though my telescope. Rather awesome




       
       
       
       
    • By williamnohair
      Hi
      am posting this in case it helps anyone who has suffered the same problem as myself.
      In a nutshell: Own a Skywatcher Gti mount for some time now and used with some success, also purchased some time ago Skysafari and wanted to use both, with a problem much reported on the web and so much information out there that it can get a bit confusing and certainly in my case frustrating, after all just want stuff to work!
      After much experimenting and help from other postings this is what happens when you fire up the Gti.
      The mount generates its own wireless network and becomes the gateway, its IP address is always 192.168.4.1 you see this when making a connection with the Synscan app/program, its very similar to a normal router that serves you the Internet. Any device that then connects to this network then gets an assigned address one up from this, i.e. 192.168.4.2, .3, etc. However if you run the Safari app and go in to settings you will find it has also been allocated an address which is one up from the device you are using. In my case my Ipad was connected to the wireless network and had been given the address of  192.168.4.3.  but when I checked the IP address in the settings page of SkySafari it was 192.168.4.4 !
      If you accept this you get the error that the app cannot join the wireless network check your settings etc. If you now manually change that address to the same as the device running the Synscan app in my case .2 it should connect and work. However there is a caveat to this, I tried using an Iphone  4 and an old Ipad and they would not work together no matter what. I got the other error message that I had joined the network but the mount did not recognise the device type I had selected (Skywatcher Synscan Alt Az GoTo) and no amount of changing things would solve it. To get around this I used my trusty Win 7 laptop to run the Synscan program and things worked perfectly so it can be done don't give up!
      Sorry this is so long but I hope it helps someone out there. So to round off when you fire up the mount it becomes address no 1, any physical device gets the next address 2, any software running on the that device gets the next address 3. When you fire up SkySafari it must have the same address as the one that the SynScan app has got and this can e changed in SkySafari settings. None of this makes any sense to me as I thought software couldn't act in that way but there you are. I hope I have got this right feel free to contact me if things don't work
       
      Regards
       
      Bill
       
×
×
  • Create New...

Important Information

By using this site, you agree to our Terms of Use.