Drift of Great Red Spot on Jupiter

Registered by Alexander Wolf on 2013-01-29

Currently Stellarium already uses a semi-experimental coefficient for GRS drift, and this correction works for a short period. Ideally we should extend this short period and simulate a longer period - around the past 200 years where observations are available. To solve this task we can use data from the JUPOS website to make a tabular interpolation for GRS longitudes as time function. For the near future, continuation of the current drift rate is a working best-guess solution.

Possible better solution for set GRS position on Jupiter's surface: create an one or more analytical equations for calculate longitude of GRS.

Skills needed: C++, Basic astronomy knowledge
Difficulty: easy

Blueprint information

Status:
Complete
Approver:
None
Priority:
Medium
Drafter:
Alexander Wolf
Direction:
Needs approval
Assignee:
pjw
Definition:
Drafting
Series goal:
Accepted for 0.13
Implementation:
Implemented
Milestone target:
milestone icon 0.13.3
Started by
Alexander Wolf on 2013-02-10
Completed by
Alexander Wolf on 2015-08-14

Related branches

Sprints

Whiteboard

First variant:
"List" of GRS longitudes since 1830 year on JUPOS website:
http://jupos.privat.t-online.de/rChartsOld.htm
http://jupos.privat.t-online.de/rGrs.htm

Possible "inner format":
year\tmonth\tlongitude, where \t - tab

Second variant (IMHO this is better way -- alexwolf):
Get data from JUPOS website and create an analytical equation for calculation of the longitude of GRS.

For both variants: Set the real longitude for the value for the Jovian rot_rotation_offset (e.g. in System II)

(?)

Work Items

Work items:
[alexwolf] Get data from JUPOS website: INPROGRESS
[alexwolf] Create a file with data in "inner format": TODO
[alexwolf] Create an analytical equations for calculate longitude of GRS: TODO
[alexwolf] Read this data in Stellarium and applies for dates from file: TODO
[alexwolf] Apply analytical equations for correct time intervals: TODO
[alexwolf] For dates not from known list use analytical equation for computation longitude for GRS: TODO

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