Re: Coronas obs

From: Jim Nix (
Date: Thu Aug 02 2001 - 13:38:19 PDT

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        Thanks, I reset the default mag for unknowns to the Molczan value and the predicted mag for the pass in
    question did come back at 4.3, with Coronas at predicted at 4.4, I would still say Coronas is dimmer than
    predicted though.  An updated Satmag.dat file would be welcome, mine is dated
    8/23/00.  Two questions, can the Molczan data be downloaded from somewhere for updating purposes, and from
    where?  Can the satmag.dat file be updated manually, ie using a text editor?
    "Matson, Robert" wrote:
    > Hi Jim,
    > > Coronas SL 14 R/B
    > > The RB is noticabley brighter than the satellite, R/B predicted at 4.8,
    > > comparing it to SAO 18897, mag 4.3 (I think Theta Cepheus, the
    > > skymap label looks like a figure 8 and I don't see a figure 8 in my
    > > greek alphabet, so theta comes close) it seems to be similar
    > > magnitude, I'm reporting 4.4 .
    > Plotting the R/B track for your location, it did pass quite
    > close to theta-Cepheus (mag 4.21, HP #101093, HD #195725).
    > The SkyMap-predicted magnitude was +4.3 at closest approach
    > to the star, so I'd say that agrees quite closely with your
    > observation.  (I used the Molczan standard magnitude of +5.5).
    > Perhaps you were using a default standard magnitude of +6?
    > I can send you an up-to-date SATMAG.DAT file if you need
    > one.
    > Best,
    > Rob
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