... Now ... how does your point density translate into surface brightness (perhaps measured in Hale-Bopp or McNaught units :-)? All we want to know -Message 1 of 31 , Feb 1View Source
> I recalculated the dust tail for this value and added it to theNow ... how does your point density translate into surface brightness
> page ( http://kometen.fg-vds.de/Publ/2011l4/2011l4schweif.html
(perhaps measured in Hale-Bopp or McNaught units :-)? All we want to know
- beforehand - is whether Joe Sixpack will see an obvious dust tail in the
sky or not in deepening twilight, because that guides outreach planning
for the general public. This is - for me - what all this forecasting is
After seeing Uwe s illustrations of the dust tail, I became curious about how it would be oriented relative to the horizon at my site in Arizona. I used theMessage 31 of 31 , Feb 3View SourceAfter seeing Uwe's illustrations of the dust tail, I became curious about how it would be oriented relative to the horizon at my site in Arizona. I used the SkySafari app to make a four-panel diagram of its position at 8:00 p.m. MST from Arizona (33 deg. N). The dates run from March 10 through 25 with a 5-day interval. Ignore the "9:00" label on the charts; it's 8:00 p.m. our time.
Uwe's figures show the dust tail arcing strongly to the south. If you rotate his figures about 90 degrees clockwise to line up with my horizon views, you can see that the dust tail will be parallel to the horizon and not visible on March 10, but it will be very favorable by the 20th.
--- In firstname.lastname@example.org, "Uwe Pilz" wrote:
> Dear observers,
> Daniel Fischer asked some weeks ago after predictions about the
> direction and dimension of the dust tail of comets, especially such
> of PanSTARRS. I wrote simulaton programm which follows the path of
> particles. With that software I calculated the future of PannSTARRS's
> dust tail. You find the results in the web pages of the German group:
> http://kometen.fg-vds.de/Publ/2011l4/2011l4schweif.html 
> I hope this is useful for the preparation of your observations.