Celestia Forums

Hello Everyone, I would like to find my camera's pointing vector using the stars. Can I determine my camera's pointing vector if I dump an image from my camera onto my computer? Then I could match all the stars brighter than 5 magnitude using a nearest neighbor database. The camera would be about a ...

Hello Everyone, I wanted to share (and document) with everyone my astro method for converting cartesian coords to Equatorial. Chris walked me through the equations and fix my problem for me. // Convert equatorial coordinates to Cartesian celestial (or ecliptical) // coordinates. void astro::celestia...

Thanks for the link. I downloaded the celx file and tried to load it into Celestia but it crashed. Is there a specific version of Celestia that I need to import this file?

Thanks,
Tim

Hello Everyone, I attempted to write a function in astro called celestialCartToEquatorial. It is the reverse of equatorialToCelestialCart. I need to acquire the RA and Dec of a star. I searched the forum for this topic but I was unable to find anything. Here is my attempt. void astro::celestialCartT...

Hello Everyone, I have done several studies for my boss using Celestia. He continues to question the accuracies of Celestia. I promised him I would look into the accuracy of this great tool. He said that other packages promise 0.2 arc sec accuracies. The tool he is refering to is for aligning theato...

I tried 0.0001 and it works very well. I will use 0.0001. I use Celestia as a scene generator to go to every star brighter than 6.0. I then use my star pattern matching algorithms to see if I can identify where my scene is pointing. I developed two star matching algorithms. Both of them are over 90%...

I have used the gotoSelection function but I am looking for a gotoSelection that goes to the body in one frame (right away). Does anyone know is there is a funciton that will do this? I noticed that gotoSelection has an argument of time. Can I use this time and set it to epsilon? I am running 5000 M...

You can check out the RealTime Celestia. It already has the orientation implemented (among other nice features) using quaternians. You will have to convince the developers to integrate these features in the CVS if you want them in the next release.

http://www.knology.net/~tec/

Tim

GREAT!!!!

Cannot I get the files? I really need them bad. My boss has been hounting me for weeks to fix this myself. You can send the modified files to tec@knology.net.

Thanks so much!
Tim

I see the problem. If you tighten the FOV to about 5 degrees you can see all of these problems better because there are not as many stars in the FOV. The 23 Hya is suppose to have an apparent magnitude of 5.23. It comes into view as I am increasing the mag filter at 7.3. It should come into view aro...

Toti, I did not quite understand your message. Did you mean that you cannot test it because you CRT is too small? You also said that the star is culled prematurely. Can you expand on this? How did you know this and where do you think the star is culled? I cannot find where it is culled. To summarize...

Hi Toti, Thanks for getting invloved. Here is how I tested the HIP 46768. I am using the latest version 1.4.1. I press the return key to bring up the command window. I type "HIP 46768" and then I center the selection with the 'c' key. By default the star will not show up because something is wrong. ...

Thanks Chris for helping me. I registered a bug report on this and I am trying to fix it myself for you guys. You might want to read it in the bug forum get a more detailed list of my problems. See "stars not rendered properly when changing magnitude filter " in the bug forum. You mentioned that the...

Hello, I would like to know where the stars are filtered as a function of the magnitude. I have walked through debugger many times and I cannot find this. When I press either of the two square brackets the star magnitude filter is increased or decreased. I can see in octree.cpp and render.cpp where ...

Thanks Chris, I have been trying to find this bug for a few days myself. My boss is needing some charts/report but I need this issue fixed before I can write the report. Is it possible to get the changes sent to me when you find the bug. My email is tec@knology.net. I don't mind helping find the iss...

Here is somemore information about my problem. I am in staroctree::processVisibleObjects() and I place an if statement in the for loop after the code: Star& obj = _firstObject[i]; if( obj.getCatalogNumber() == 46768 ) ii=0; I placed a stop at the ii=0; I was hoping to catch the star rendering so...

I have noticed that there are several stars that are not drawn when I adjust the magnitude filter. But the apparent magnitude is smaller than the filter using the [] keys. I am using points as the star style. Here is an example. Only render stars and center star HIP 1099. Adjust the star magnitude f...

I have noticed that there are several stars that are not drawn when I adjust the magnitude filter. But the apparent magnitude is smaller than the filter using the [] keys. I am using points as the star style. Here is an example. Only render stars and center star HIP 1099. Adjust the star magnitude f...

I don't know what you mean by a patch. Can you explain and I will conform to it. My latest version of the RealTime Celestia 2.0 has several of the coding conventions fixed. I went through the coding conventions document and changed the things it suggested. Let me know if there any other coding conve...

Hello Everyone, I have been tasked by my boss to come up with an alorithm to recognize a spacecraft's orientation given the spacecraft's CCTV image. Most spacecrafts have an IMU (inertial measurement unit) that tells which way the spacecraft is pointing. To calibrate the spacecraft, the IMU must use...