Where can I get keps for the moon (ao-0) and keep them updated? how much do they change over time?
Eric AF6EP
Most prediction programs already track the moon although the moonbounce guys use specialist moon tracking programs. There are no keps available. The chosen program just knows how to do it.
Eric Fort wrote:
Where can I get keps for the moon (ao-0) and keep them updated? how much do they change over time?
Eric AF6EP _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
Eric,
The moon (and sun!) are sufficiently massive that you can't make the same simplifying approximations. Many programs such as ITrack, SATPC32, Nova, Trak-SM, etc, all have the capability to generate the required data using different algorithms which do not require updating. At one time I saw a program which would generate pseudo-Keps which were good for a few days, but I am not certain if that still exists somewhere.
Alan WA4SCA
At 2:05 PM -0800 11/14/08, Eric Fort wrote:
Where can I get keps for the moon (ao-0) and keep them updated? how much do they change over time?
http://www.amsat.org/amsat/ftp/software/PC/tracking/moonkeps.zip
That's a DOS program (which probably runs fine under Windows too) that can compute a set of pseudo-Keplerian elements for the Moon, which are good for a limited time (a month).
The document file in that archive also includes elements for the Sun, which can be modeled as an Earth-orbiting satellite. These elements are good for many years, at least for predicting pointing angles. Some tracking programs, however, may reject these elements due to range checking on the values.
73 -Paul kb5mu@amsat.org
Hi Eric AF6EP
The very popular software InstantTrack can be used for the Sun and Moon and don't need Keplerian Elements
73" de
i8CVS Domenico
----- Original Message ----- From: "Eric Fort" eric.fort@gmail.com To: "AMSAT-BB" amsat-bb@amsat.org Sent: Friday, November 14, 2008 11:05 PM Subject: [amsat-bb] need keps for ao-0
Where can I get keps for the moon (ao-0) and keep them updated? how much
do
they change over time?
Eric AF6EP _______________________________________________ Sent via AMSAT-BB@amsat.org. Opinions expressed are those of the author. Not an AMSAT-NA member? Join now to support the amateur satellite program! Subscription settings: http://amsat.org/mailman/listinfo/amsat-bb
participants (5)
-
Alan P. Biddle -
Eric Fort -
i8cvs -
Nigel Gunn G8IFF/W8IFF -
Paul Williamson