Search results

BrianJ For Orbiter, MJD 53555.2361204175: DEEP IMPACT IMPACTOR SPACECRAFT (-70): STATUS Orbiting Sun RPOS -87677373448.5129700000 1342139709.1339679000 -207560947700.5499900000 RVEL 18425.6143400189 -109.7969736431 -12745.0399791712 TEMPEL 1 (1000093): STATUS Orbiting Sun RPOS...

Look at "Example: calculate the inclination for a sun-synchronous polar orbit" in Doc\Technotes\gravity.pdf. Mars sun-synchronous polar orbits with ecc=0: Alt=100km; Incl=95.75deg. Alt=200km; Incl=96.09deg. Alt=300km; Incl=96.44deg. Alt=400km; Incl=96.79deg.

If you want to place an object into Lagrange point, then accuracy is very impotent. Some points are very unstable. I didn't find how to set correct position and velocity for a vessel using Lagrange MFD 0.7, so I wrote another MFD: Lagrangian points MFD v0.2

Yes, I used Target Intercept and Orbit Eject linked, trying to find best dV.

Seems with dV limit 6900 m/s it's possible to get to Mars much faster than at 31 December 2011: 1. MJD 55317, dV=6873 m/s, intercept Mars at MJD 55741 MJD (June 29, 2011). But better to wait few weeks and save fuel for maneuvers: 2. Burn time 55334 MJD, total dV=6709, arrival at 55759 MJD...

I use MFD2 and CELBODY2 classes. It will not be easy to rewrite the module for 2006. ---------- Post added at 06:00 PM ---------- Previous post was at 11:53 AM ---------- Update to v0.2. Compiled against Orbiter 2006 (will work in 2009 beta too). Some code was taken from TransX because...

This module calculates position and velocity of Lagrangian points in Orbiter, show coordinates and speed vector of your ship relative selected point and can "teleport" ship into. It can calculate RPOS/RVEL of selected point and write it into *.scn file on saving. Useful for placing stations into...

SPICE v0.3 for Orbiter 2010.

SPICE library can work with two-line element set too. getelm_c() - to parse, ev2lin_()- to propagate the state.

Strange. There is must be empty "Kernels" folder in zip above. Maybe it was not unpacked because it's empty? You can create folder, or just change settings in Phoebe.cfg from "Kernel = Kernels\sat252s.bsp" to your own path to *.bsp file, for example "Kernel = C:\Files\sat252s.bsp".

You need to download ftp://naif.jpl.nasa.gov/pub/naif/generic_kernels/spk/satellites/a_old_versions/sat252s.bsp ant put it into Kernels folder. There is also new ephemeris file for Saturn moons in ftp://naif.jpl.nasa.gov/pub/naif/generic_kernels/spk/satellites/sat317.bsp , so you can download...

You can use SPICE module ( http://orbiter-forum.com/showthread.php?p=129413#post129413 ) for adding Phoebe and many other objects into Orbiter.

[deleted]

Lagrangian points MFD v0.2

It's a simple addon for computing position and velocity of Lagrange points in Orbiter.

For Earth clbkEphemeris/clbkFastEphemeris return only EPHEM_TRUEPOS|EPHEM_TRUEVEL|EPHEM_POLAR. Not EPHEM_BARYPOS/EPHEM_BARYVEL :( Thanks! I'll go this way. But, if oapiGetBarycentre is here, why is there not some oapiGetBarycentreVel function in SDK?

How to get barycenter velocity? I need it for calculation of Lagrange points for planets. oapiGetBarycentre returns position only :(

Yes. It's far away from L1 (>30M). Seems like you did not change ErrorLimit for Moon from 1e-5 to 1e-8 in Moon.cfg ;) In my tests with latest beta I have ~1.2M shift from L1 ater 14 days (3.8days-1k, 7.3 - 10k, 10.6-100k, 13.8-1000k). I use Orbiter_ng.exe without graphics module for testing...

After few expirements with L1 in Sun-Jupiter system (without Saturn and other planets of course) i found: 1. D=R*(1-(a/3)^(1/3)) where a=M2/(M1+M2) from wiki is very inaccurate. Only for a<<1. 2. Solution of M*L^5 - 3*M*L^4 + 3*M*L^3 - L^2 + 2*L - 1 = 0 (where M=M1/M2 and L - distance from M2...

Thanks. I found lagrange.pdf too but I didn't find first link. I'll readi it. I tried it firstly. Got formula L1: (R*(1-(a/3)^(1/3)),0) from lagrange.pdf for position and ( Vx * D/R, Vy * D/R ) for speeed, put it into Orbiter, but ship is go away from L1 very fast. It's very approximate...