## lunar descent trajectory design

Using GMAT for specific types of missions.

### lunar descent trajectory design

Is it possible to design a descent trajectory.I have designed a capture orbit 150X150 then a orbit of 15X150.
But is it possible to design a descent trajectory from an altitude of 15km?
geno

Posts: 8
Joined: Mon Jan 20, 2014 2:43 pm

### Re: lunar descent trajectory design

It's certainly possible to design a descent trajectory in GMAT, but we don't have any special support for that kind of thing. You would just be designing an orbital trajectory that ends at a lunar altitude of 0km.
Joel J. K. Parker
Flight dynamics engineer, GMAT team
http://gmatcentral.org
jjkparker

Posts: 617
Joined: Thu Jan 07, 2010 9:48 pm
Location: NASA Goddard Space Flight Center, Greenbelt, MD

### Re: lunar descent trajectory design

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jivuma

Posts: 1
Joined: Mon Nov 26, 2018 10:51 am

### Re: lunar descent trajectory design

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Zachary Hindley

Posts: 1
Joined: Mon Dec 10, 2018 6:48 am

### Re: lunar descent trajectory design

I'm no expert, but maybe you can just:
- set an Ap burn to a 0x100
- set a "delta t to start finite burn" & burn time variables
- make target for the solver
- vary delta t to start finite burn, & bt
- propagate for dttsfb secs
- start the burn
- propagate for bt secs
- achieve RMAG = 1736 (lunar radius?) & v = 0
in real life there may be terrain etc but you could use this idealization to get a feel for it with "real" engine specs etc
njb

Posts: 4
Joined: Thu Feb 21, 2019 3:49 am