IPB

Welcome Guest ( Log In | Register )

 
Reply to this topicStart new topic
Problem I am having using SPICE to create .spk file
ncc1701d
post Aug 21 2021, 04:58 AM
Post #1


Junior Member
**

Group: Members
Posts: 91
Joined: 21-August 06
Member No.: 1063



This question is for someone with experience making .spk files in SPICE and using MKSPK
I am over simplifying the data values to help explain or get to the point quicker.
I am working with real data from Pioneer 12 so the data I wouldnt think is the problem

True Anomaly values on approach to Periapsis go from -30 deg then -25 deg on down to then 0 deg at the point of periapsis and then goes back up to +30 deg as it leaves periapsis.

For the sake of discussion I use these numbers for True Anomaly.
-30 deg etc. on approach to periapsis
-25
-20
-15
-10
-5
-0 deg True Anomaly at periapsis
5
10
15
20
25
30 deg leaving orbit after periapsis

Problem is when making the .spk and checking it in Cosmographia the approach trajectory looks normal but then stops right at 0 deg and then starts going backward practically overlapping the approach trajectory path.
I dont know why. Any SPICE .spk creators experience this phenom? I am using ELEMENTS for the input data type.

thanks
Go to the top of the page
 
+Quote Post

Reply to this topicStart new topic

 



RSS Lo-Fi Version Time is now: 19th March 2024 - 04:21 AM
RULES AND GUIDELINES
Please read the Forum Rules and Guidelines before posting.

IMAGE COPYRIGHT
Images posted on UnmannedSpaceflight.com may be copyrighted. Do not reproduce without permission. Read here for further information on space images and copyright.

OPINIONS AND MODERATION
Opinions expressed on UnmannedSpaceflight.com are those of the individual posters and do not necessarily reflect the opinions of UnmannedSpaceflight.com or The Planetary Society. The all-volunteer UnmannedSpaceflight.com moderation team is wholly independent of The Planetary Society. The Planetary Society has no influence over decisions made by the UnmannedSpaceflight.com moderators.
SUPPORT THE FORUM
Unmannedspaceflight.com is funded by the Planetary Society. Please consider supporting our work and many other projects by donating to the Society or becoming a member.