John Locker wrote: > Looking at the disk of Jupiter I now think the E-W FOV was > more like 2.5 arc minutes. Also , because I was using a > Barlow lense it is difficult to decide if there is any shape > to the satellite as magnification was 700-800 times , which > is well above the theoretical useable max of the LX90 . > > However I would like to think that there is a triangular like > structure under the glare. Of course we have no idea what IGS > birds look like , so that presents a bit of a problem. It does indeed. Analysis of Russell Eberst's observations reveals that IGS 1B is 2.3 magnitudes brighter than IGS 1A: http://satobs.org/seesat_ref/IGS_mag_vs_phase/IGS-1A.gif http://satobs.org/seesat_ref/IGS_mag_vs_phase/IGS-1B.gif Note also that IGS 1B's magnitude is uncorrelated with phase angle, as would normally be expected of a specular reflecting sphere, which IGS 1B almost certainly is not. Apparently it is a complex object. Ted Molczan ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
This archive was generated by hypermail 2b29 : Sun May 23 2004 - 15:30:37 EDT