**Previous message:**Kevin Fetter: "Re: broadcast of flaring geo sat's, from the other night"**In reply to:**B Gimle @ComHem: "Re: Standard Magnitude Calculation"**Next in thread:**Bjoern Gimle@GlocalNet: "Re: Standard Magnitude Calculation"**Reply:**Bjoern Gimle@GlocalNet: "Re: Standard Magnitude Calculation"**Messages sorted by:**[ date ] [ thread ] [ subject ] [ author ]

It is this radar cross section to standard magnitude conversion that I am interested in. I will look into SkyMap later this evening. On Tue, Oct 14, 2008 at 1:30 AM, B Gimle @ComHem <b.gimle@comhem.se> wrote: > Most standard magnitudes are derived from actual observations, after > (approximate) conversion to 90 or 180 degrees phase, probably using > ln(1-cos(phase) and 5*log10(range) as correction terms. > Also there are different preferences re using max or average magnitude. > See http://www.io.com/~mmccants/tles/intrmagdef.html > Rob Matson's SkyMap can use the standard magnitude on elset Line0 or in its > SKYMAP.DAT file. > The SKYMAP.DAT can also contain Radar Cross Sections, which are converted to > standard magnitudes internally. > > From dimensions, surface form and properties "conversion" is very difficult, > but I believe that a white sphere of 1 m2 cross-section is +6.4 > > /Björn > > ----- Original Message ----- >> >> I am interested in how standard magnitude is calculated. I have been >> unable to find information on this exact calculation beyond the fact >> that it is based on the surface area of the spacecraft and some >> assumptions about the surface properties. >> >> I cannot find further definition beyond what is mentioned here: >> http://www.io.com/~mmccants/tles/mccdesc.html > > > ------------------------------------------------------------------------- > Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: > http://www.satobs.org/seesat/seesatindex.html > > ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html

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