> > Ted Molczan wrote: > > Lacrosse 5's std mag of 2.9 in its final configuration, does represent a > > significant increase in apparent brightness - about 0.7 magnitudes - > relative > > its predecessors. So far, Ed Cannon has responded to my question about > colour, > > agreeing with my observation that it is less red. Also, I note Thierry > Marais' > > argument in support of the idea that the difference colour may account for > much > > of the perceived difference in brightness. > > Instead of making a positional observation, I observed last night's pass of > Lacrosse 5 at 19:55 UTC with the naked eye. Conditions here were good with > reasonable transparency and no moon. Lacrosse 5 passed within a couple of > degrees of Vega (alpha Lyrae) which was very useful indeed for a visual > estimate of brightness and colour. > > I estimated its brightness to be between 1.5 and 2 on a maximum 62 degree > pass before shadow entry. Its colour was noticeably more pale than its > predecessors - a yellow-white colour, definitely not orange. I would > confirm that it is half a mag or more brighter than the other Lacrosse sats, > though I accept Thierry's point about perceived brightness. > > Best wishes > > Bruce > > Bruce MacDonald > COSPAR Site 2751 > Devizes, Wiltshire, UK > 51.3440 N 1.9849 W 125m (WGS84) > ------------------------------------------------------------------------- Subscribe/Unsubscribe info, Frequently Asked Questions, SeeSat-L archive: http://www.satobs.org/seesat/seesatindex.html
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