Celestia Forums

rinoa79

What do you mean by "create a frame of reference"? Exactly what are you trying to do? Have you read the related sections in the Celestia WikiBook? http://en.wikibooks.org/wiki/Celestia#Customizing_Celestia I maked this script: while true do ti = celestia:getscripttime() terra = celestia:f...

rinoa79

Hi folks, please, can someone tells me how to create a frame of reference like J2000 equator (Earth equator at epoch J2000 as the fundamental plane. The x-axis points along the J2000 vernal equinox, the z-axis is the mean north pole, and the y-axis completes the right-handed system) but centered in...

rinoa79

Thank you, Chris!
Mary

rinoa79

Now original script gives me RA wrong too...

rinoa79

Mary, Actually, my script only gives accurate RA/Dec values for distant objects (stars, DSO's) and when the observer is in the neighbourhood of Earth. If you want to get RA/Dec for spacecraft, please replace the getRADec function with the following one that uses an observer centered coordinate syst...

rinoa79

The epoch looks wrong--I think that Celestia and Orbitron must use a different format for it. Can you post the unmodified Orbitron data? --Chris Hi Chris, is it possible that hubble's parameters are wrong? I'm using parameters downloaded from Celestia Motherlode. I'm watching hubble orbiting and I ...

rinoa79

chris wrote:The epoch looks wrong--I think that Celestia and Orbitron must use a different format for it. Can you post the unmodified Orbitron data?

--Chris

I downloaded Orbitron from this site:
http://www.stoff.pl/

rinoa79

chris wrote:The epoch looks wrong--I think that Celestia and Orbitron must use a different format for it. Can you post the unmodified Orbitron data?

--Chris

Excuse me Chris,
I don't understand... What is unmodified Orbitron data? Can you explain me?
Thx, Mary.

rinoa79

Hi folk, someone knows what are the right parameters that I must insert in a .ssc file to have seasat1's orbit? I have used these (I took them from Orbitron): "SeaSat1" "Sol/Earth" { Class "spacecraft" Radius 0.00105 EllipticalOrbit { Period 0.06934 SemiMajorAxis 7130 ...

rinoa79

I forgot to tell you that I have changed only the first line with this:

Code: Select all

obj = celestia:find("Sol/Earth/SEASAT1")

I maybe made a mess... :oops:

rinoa79

selden wrote:Mary,

What values do you get?

RA = 13h 33min...
DEC = -57° 35' ...
but real values are around:
RA = 3h...
DEC = -9°...

rinoa79

Mary, On top of the issue raised by Selden, your script does not display the right Celestia values for R, Ra and Dec. Though I don't have the time to investigate what is wrong with your script, you can use the following script that displays R, RA, Dec for the selected object. RA/Dec are displayed r...

rinoa79

abramson wrote:Hi. No. For the sake of fast computing, all orbits in Celestia are elliptical 2-body orbits (typically for stars, planets, moons, spacecraft in low orbit...), or sampled orbits (usually for spacecrafts in complex interplanetary flight).
Cheers,
Guillermo

Thank you for you fast help!
Bye, Mary.

rinoa79

Hi folk! I have created a script to compare ISS's real coordinates (RA, Dec, r) found in this site: http://www.n2yo.com/ with ISS's coordinates calculated using Celestia. But they didn't correspond. Please, can someone tell me why? I think I made some mistakes but I don't understand where! This is ...

rinoa79

Hi of all,
I think I will do a stupid question...
But I didn't understand if Celestia applies the three-body problem for its calculations.
Please, can somebody explain me? :oops:

Thanks in advance,
Mary!

rinoa79

Hi, I'm looking for some information about satellites that orbit around Earth. Like geocentric coordinates, average speed, .. I need all mission data!
Please, can somebody give me some link where I can find them?
Thanks in advance,
Mary.

rinoa79

Mary, your code is wrong, because "pos1:length()" is placed in the numerator and not in the denominator. I can give you a correct, alternative version of this line, which is equivalent to my original one: tspeed = dist * math.acos((pos2 * pos1)/(pos2:length()*pos1:length())) / ((t2 - t1) ...

rinoa79

Mary, You can use the following script: while true do obs = celestia:getobserver() sel = celestia:getselection() pos1 = obs:getposition()-sel:getposition() t1 = celestia:gettime() wait(0.1) pos2 = obs:getposition()-sel:getposition() t2 = celestia:gettime() dist = (pos2:length()+pos1:length()) / 2 t...

rinoa79

[/quote] Mary, You can use the following script: while true do obs = celestia:getobserver() sel = celestia:getselection() pos1 = obs:getposition()-sel:getposition() t1 = celestia:gettime() wait(0.1) pos2 = obs:getposition()-sel:getposition() t2 = celestia:gettime() dist = (pos2:length()+pos1:length(...

rinoa79

Hi, I saw that Celestia can show me eclipses. Please, can someone tell me if there is a way to obtain the eclipse time? Is there some Celestia's method that does it? I need to know also if there is a Celestia's method which give me "access windows" (at what times you can start and stop to...

Celestia Forums

Posts by rinoa79

Re: Create a frame of reference

Create a frame of reference

Re: seasat1's parameter

Re: Script to compare coordinate

Re: Script to compare coordinate

Re: seasat1's parameter

Re: seasat1's parameter

Re: seasat1's parameter

seasat1's parameter

Re: Script to compare coordinate

Re: Script to compare coordinate

Re: Script to compare coordinate

Re: Stupid question

Script to compare coordinate

Stupid question

Where I can find satellite's information?

Re: How Celestia calculates speed?

Re: How Celestia calculates speed?

Re: How Celestia calculates speed?

I need help!