Hi All,
During a total only the brightest satellites would be
visible; but during an annular, perhaps the brightest of Iridium
flares would be detectable. Venus certainly and 'maybe' Jupiter at
best. Anything fainter than about 0 magnitude would be extemely
difficult, and that is during the annular phase itself. Outside
central phase I would say you would have very little hope of seeing
any satellites. Of course if you have a decent sized telescope aimed
precisely, then who knows?
Sorry to sound so negative, but having been to several total and
annular eclipses over the years, I really would not hold out too much
hope for the sky to get dark enough to do anything really useful.
However, I wish you all every success.
Rod Austin
On 9/25/05, b_gimle@algonet.se <b_gimle@algonet.se> wrote:
> I wrote the attached message to Dan, Russell, Gerhard (and Rob)
> Using Rob's SkyMap you can get predictions for daytime (but you
> might want to AVOID those where SP5;PA occur)
>
> Anyway, Sun and Moon are only at 28 deg elevation, so a satellite
> at 800 km crosses the shadow some 1500 km SE of Madrid,
> and in other directions it is more or less free from the dense part.
> Some satellites passing 8:58?- 1 min.:
> 24966 IRIDIUM 35
> 15032 SL-8 R/B
> 25261 ARIANE 40 R/B
> 23323 IRS P2
> 11416 NOAA 6
> 28680 SL-12 DEB
> 13923 NOAA 8
> 11672 SL-14 R/B
> 13128 SL-8 R/B
> 13552 COSMOS 1408
> 14680 SL-8 R/B
> 25695 SS-18 R/B
> 26083 GLOBALSTAR M060
> 10544 NOSS 2 (E)
> 26222 CZ-4 DEB
>
> But I find Iridium 7 passing 09:36 (and no flare at all during eclipse)!
>
> /Björn
>
> ----- Original Message -----
> ...
> > how can I get predictions for if and when such objects might be visible?
> > using starry night pro (which doesn't list too many LEO objects) for
> > example, I notice iridium 7 is in the area at the time of the peak.
> will
> > it be obscured by the umbra for the entire time it's in line-of-sight
> with
> > madrid?
>
> ------------------------------------------------------
>
> Since SkyMap 6.1:
>
> When F8 (Check for satellites in lunar umbra) is "On", program
> determines if moon occults any portion of the sun as seen from
> the satellite. If so, the satellite visual magnitude is adjusted
> to account for the fraction of the sun occulted.
>
> If the sun is more than 50% occulted, the satellite track color
> is set to dark blue. (This is a slightly darker blue than the
> blue used for tracks when the earth limb is blocking part of the
> sun.) If the sun is more than 90% occulted, the satellite track
> color is set to dark purple (a darker purple than that used for
> tracks dimmer than the satellite magnitude limit).
>
> Apart from the fact that my ability to associate the colour of a line
> with the proper description, plotting "all" satellites makes the
> graph unreadable. See Eclipse2.gif!
>
> NB - I omitted this because it is 635 kB (~800 in transmission)
> Let me know if you still want to see it!
>
> But turning on option F6 (HPGL output) creates a text file where the
> colour codes can be easily located with a good text editor (I use
> UltraEdit, which also can record macros to process the complete file)
>
> With this method I located "all" objects that showed a 'SP5;PA' from
> 06:00 to 10:19 UTC above horizon from Dan Deak's location.
> I used a mag limit of 13, and range 55555 km (!) to get the list,
> but of course you can set lower limits though using the same set.
> I also set 'Horizon' mode (F7/F7) to get alt/az correct (not the star
> track) regardless of time.
>
> You can use the attached file eclipsed.sel to extract elsets for
> relevant objects from a large tle file.
> Use my program 'applysel.exe large.tle eclipsed.sel eclipsed.tle'
> or Mike's 'xf6.exe eclipsed.sel large.tle eclipsed.tle'
> but in the latter case my comments (HP plot coordinates for start
> of SP5 color code) will appear as TLE lines 0.
>
> Of Russell's suggestions, my list contains only 23561, 22566, 22220, 15944,
> 13367, but #15644 is a beauty!
>
> Cosm1674c.gif shows that #15644 is predicted to dip to mag +13.5
> right after culmination, despite a favourable phase angle.
>
> Cosm1674c.bmp is an enlargement (before conversion to .gif) where the
> colour
> changes from SP6 to SP5, 1 second before 8:37 UTC.
>
> DanmDea6_E is a prediction for objects that could reach mag +6, but I used
> PaintShopPro to change yellow, blue, red to black in the Edit Color Palette
> menu, enhancing the SP5 sections.
>
> /Björn
>
>
>
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