WinJUPOS 12.0.9 released on 2021 July 22
WinJUPOS 12.0.8 released on 2021 July 11
Please note: WinJUPOS 10.2.0 and later use another definition of System 3 which was already implemented in
the DOS predecessor PC-JUPOS. Master data (MEA and CMT), Selections (WSE) and Positional averages (PAV) are
unaffected by this change. However, you have to re-generate, e.g., Drift charts in order to re-calculate System 3!
PC-JUPOS <= 6.24 ... 870.536°/d ... 
PC-JUPOS >= 6.30; WinJUPOS <= 10.1.15 ... 870.5366420°/d ... 
WinJUPOS >= 10.2.0 ... 870.536°/d ... 
 Seidelmann, P. K.: Explanatory Supplement to The Astronomical Almanac, University Science Book, Mill Valley (California), 1992
 P. K. Seidelmann (Chair), B. A. Archinal (Vice-Chair), M. F. A'Hearn, D. P. Cruikshank, J. L. Hilton, H. U. Keller, J. Oberst, J. L. Simon, P. Stooke, D. J. Tholen, and P. C. Thomas, Report Of The IAU/IAG Working Group On Cartographic Coordinates And Rotational Elements: 2003, Celestial Mechanics and Dynamical Astronomy, 2005, 91, pp. 203-215, http://astrogeology.usgs.gov/Projects/WGCCRE/
 B. A. Archinal, M. F. A'Hearn, E. Bowell, A. Conrad, G. J. Consolmagno, R. Courtin, T. Fukushima, D. Hestroffer, J. L. Hilton, G. A. Krasinsky, G. Neumann, J. Oberst, P. K. Seidelmann, P. Stooke, D. J. Tholen,P. C. Thomas, I. P. Williams. , Report of the IAU Working Group on Cartographic Coordinates and Rotational Elements: 2009, Celestial Mechanics and Dynamical Astronomy, 2011, Volume 109, Issue 2, pp 101-135, http://astropedia.astrogeology.usgs.gov/download/Docs/WGCCRE/WGCCRE2009reprint.pdf
See also here.
You may find newer, though perhaps not yet widely tested versions and a changelog on
Features of WinJUPOS are documented in its built-in F1 help, and summarized on
Grischa's Introduction page.
For a list of external tutorials written by WinJUPOS users and compiled by Grischa
Please note: Longitudes of Jupiter's Central Meridian calculated by WinJUPOS and its predecessor
PC-JUPOS always refer to the illuminated disk (i.e., they are phase-corrected), not the full
planet's ellipse as done by most other ephemerides. The difference between both types of Central
Meridians can reach 0.6° maximum. This divergence affects longitudes of Central Meridians
only, and has no impact on object longitudes measured on images.
To visit the main page of the JUPOS project, go to