# Re: Inclination of the satellite to ecliptic plane

From: C. Bassa via Seesat-l <seesat-l_at_satobs.org>
Date: Tue, 29 Dec 2015 00:15:17 +0100
```Hi Vlad,

On Mon, Dec 28, 2015 at 11:47 PM, Vladislav Gooba via Seesat-l
<seesat-l_at_satobs.org> wrote:
> How can I calculate or from where can I took these normal vectors, how and in
> what reference system are they measured?

The easiest solution is probably to compute the position and velocity
of the satellite using a satellite model like SGP4/SDP4 as it takes
care of the osculating elements. From position and velocity you can
compute the normal vector of the orbit by taking the cross product of
the position and velocity vectors. This normal vector is in the
reference system of SGP4/SDP4, which is, to first order, the
equatorial frame. The normal vector then points to an RA/Dec which you
can convert to ecliptic longitude and latitude. The ecliptic latitude
is then a measure for the inclination with respect to the ecliptic.

Regards,
Cees
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Received on Mon Dec 28 2015 - 17:15:48 UTC

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