Skip to main content
5 votes

Saving STK Scenario from Python app

Your variable root is of type IAgStkObjectRoot. If you search the Programming Interface Help, there are five save related ...
Carlos N's user avatar
  • 4,474
5 votes
Accepted

Which method STK uses to compute Umbra or Penumbra time intervals?

Although AGI freely publishes the Math Spec of their orbit determination product (ODTK), I'm not aware of a freely available MathSpec for STK. However, the verification and validation of GMAT was done ...
ChrisR's user avatar
  • 6,180
5 votes
Accepted

How can I extend EOP data beyond the last prediction epoch?

Any predictions of the Earth Orientation Parameters that go beyond a few months to a year into the future are more or less worthless. What you can do, and I suspect what STK does (I don't use that ...
David Hammen's user avatar
  • 74.9k
5 votes
Accepted

STK SGP4 for Geostationary Satellite

As far as I can tell, this is nothing to worry. What goes into a TLE is a specific kind of average elements, which are meant to simplify short-term propagations. Here "mean" does not imply a time-...
Mefitico's user avatar
  • 1,967
5 votes
Accepted

Generating TLEs with STK Using SGP4 Propagator;

First, the SGP4 propagator is meant to propagate TLEs. He takes a TLE and a time since the TLE's epoch as inputs and outputs a position and a velocity. By selecting several times, you get a trajectory....
Mefitico's user avatar
  • 1,967
4 votes
Accepted

SGP4 on Systems Tool Kit (STK); how to check if SDP4 deep space correction is implemented?

I can confirm that the STK SGP4 propagator contains the deep space corrections in SDP4. Source: I worked at Analytical Graphics, Inc (AGI) for 25 years and the astro team sat 2 desks away from me :). ...
Tom Johnson's user avatar
4 votes

STK Astrogator Earth Flyby

The New Horizons mission tutorial you refer to may come from our blog here. You'd have to do something similar. Astrogators Guild Blog For multiple flyby missions, Marty Ozimek and Justin Atchinson ...
Mike Loucks's user avatar
4 votes

Geo satellite - antenna gain contours to heat map in STK

I know of one way to (almost) do it, but it's clunky and annoying, so you may do better to just plot a hundred contour lines (the maximum allowed) and fill in the colors between them with an image ...
Ryan C's user avatar
  • 7,962
3 votes

Create a sensor in STK

If your field of view defined as a typical solid angle, as shown on Wikipedia, then you'd define the half angles as the half of 100x100: 50x50. STK (and probably other modeling tools) accounts for the ...
ChrisR's user avatar
  • 6,180
2 votes
Accepted

Model vehicle separation on STK Astrogator?

You aren't using the follow segment properly. A follow segment is normally used at the begging of the MCS to replace either a launch segment or an initial state. It grabs a state (or perhaps an entire ...
Mike Loucks's user avatar
2 votes

STK Astrogator Earth Flyby

The full answer is beyond the scope of StackExchange. A quick Astrogator tutorial for earth departure to Mars orbit can be found here. Ultimately you will need to use b-plane targeting if you want ...
Carlos N's user avatar
  • 4,474
2 votes
Accepted

STK Computation of DUT1

You will see this STK behavior with both UT1-UTC and with polar motion parameters. In STK, the default Earth Orientation Parameters file EOP-v1.1.txt only goes back 5 years. I'm guessing this is for ...
Carlos N's user avatar
  • 4,474
2 votes

SGP4 on Systems Tool Kit (STK); how to check if SDP4 deep space correction is implemented?

This is a partial answer, and I think it would be good to have confirmation from someone who knows more about this than I do. After my previous answer I did some more searching, and found History of ...
uhoh's user avatar
  • 149k
2 votes

True Anomaly of Circular Orbit

For your own calculations, whenever you have a case of zero (or very small) eccentricity you may need to handle them differently and just choose an arbitrary argument of periapsis, perhaps zero. ...
uhoh's user avatar
  • 149k
2 votes

How can I get longitude of ascending node from satellite TLEs with Right Ascension of Ascending Node (RAAN)?

The ascending node is wherever an orbit crosses the equatorial plane, going from south to north. The right ascension of that crossing, $\Omega$, is measured with respect to the distant stars, in an ...
Ryan C's user avatar
  • 7,962
2 votes
Accepted

Using astrogator in STK to separate 2 satellites using atmospheric drag

I believe this will work, although I haven't fully tried it out. You should be able to do this on both satellites, or on just one satellite. There may be other ways of doing it as well. I will ...
Carlos N's user avatar
  • 4,474
2 votes

central body frame (CBF) in STK

The difference is whether the frame's axes are non-rotating with respect to inertial (central body inertial, or CBI for short) or are rotating with the body in question (central body fixed, or CBF for ...
David Hammen's user avatar
  • 74.9k
2 votes
Accepted

STK 11.2: perform a low-thrust optimal transfer

From what I can tell from the parameters in your screenshots, the program has performed a perfectly valid optimisation. What's more concerning is that the text in you question doesn't match the ...
SE - stop firing the good guys's user avatar
1 vote

STK - Create a scanning sensor

The video look and feel makes me think it was generated by AGI, so you could easily mail [email protected] The short answer, is that you cannot do it just out of the box. You have to generate pointing ...
Carlos N's user avatar
  • 4,474
1 vote

How can I edit the STK report output?

I was trying to prepare an report for the electric thrust LEOP by STK. This report was going to include satellite x, y , z axes + some other satellite related angles (which were all created by myself ...
Onur Gürdoğan's user avatar

Only top scored, non community-wiki answers of a minimum length are eligible