· Get a Cloudy Nights T-Shirt · Submit a Review / Article Click here if you are having trouble logging into the forums Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User You are not logged in. [Login] Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Astrophotography and Sketching >> Sketching Previous   Index   Next   Threaded   Pages: 1 Uwe Pilz scholastic sledgehammer Reged: 05/16/08 Loc: Leipzig, Germany Hesiodus ray       #2907593 - 02/04/09 01:20 PM Attachment (51 downloads) Edit   Reply   Quote Quick Reply   Yesterday night the Hesiodus ray was easy to see here in Europe. I observed with a 15-cm-Mak@180x. The ray was less contrasty and darker than the bright top of the mountains. I tried to show this in the sketch. Post Extras:       rodelaet Post Laureate Reged: 04/28/06 Loc: 50°56' N - 4°58' E (Belgium) Re: Hesiodus ray [Re: Uwe Pilz]       #2907889 - 02/04/09 04:06 PM Edit   Reply   Quote Quick Reply   Uwe, Great catch! The ray is nicely rendered. Thank you for sharing. Post Extras:       frank5817 Postmaster Reged: 06/13/06 Loc: Illinois Re: Hesiodus ray [Re: rodelaet]       #2908587 - 02/04/09 10:35 PM Edit   Reply   Quote Quick Reply   Uwe, I really like viewing these sunlight rays myself. Sketching them is a real challenge because of how quickly they evolve. Great job on this one. Frank Edited by frank5817 (02/04/09 10:38 PM) Post Extras:       CarlosEH Postmaster Reged: 01/19/05 Loc: Pembroke Pines, Broward County... Re: Hesiodus ray [Re: frank5817]       #2908948 - 02/05/09 04:28 AM Edit   Reply   Quote Quick Reply   Uwe, An excelent observation of this interesting lunar phenomena associated with the crater Hesiodus. This lunar ray is impressive when caught at the right time. Thank you for sharing it with us all. Links: http://www.lunarrepublic.com/atlas/sections/f3.shtml http://www.lpi.usra.edu/resources/cla/info/f14/ http://ephemeris.sjaa.net/0801/h.html http://www.shallowsky.com/moon/rukl54.html http://www.lpod.org/?m=20070313 http://www.damianpeach.com/barbados06/lunar/pitatus_hesiodus_2006_04_08.jpg http://www.lpod.org/archive/LPOD-2005-02-07.htm http://jeff.medkeff.com/astro/lunar/s_rays.htm (interesting article on lunar rays by Jeff Medkeff) Carlos Post Extras:       markseibold Carpal Tunnel Reged: 01/19/08 Loc: Portland Oregon Re: Hesiodus ray [Re: Uwe Pilz]       #2916839 - 02/09/09 03:22 AM Edit   Reply   Quote Quick Reply   Uwe Very interesting rendering and artwork. Now I will look for this lighting effect in Hesiodus next month, thanks to your posting this! Sorry I missed this post by you earlier. Also ironic that I just saw another interesting light ray in the crater Grimaldi for the first time on Saturday night. I look forward to seeing your next observation and sketches. Mark Post Extras:       frank5817 Postmaster Reged: 06/13/06 Loc: Illinois Re: Hesiodus ray [Re: markseibold]       #2918354 - 02/09/09 08:03 PM Edit   Reply   Quote Quick Reply   Uwe, Can I ask, did you just happen to catch this bright ray or did you plan in advance to sketch it, because you knew about the ray ahead of time from an ephemeris? Frank Post Extras:       Tommy5 Carpal Tunnel Reged: 03/28/04 Loc: Chicagoland Re: Hesiodus ray [Re: frank5817]       #2918762 - 02/09/09 11:32 PM Edit   Reply   Quote Quick Reply   great sketch, these rays are really cool when you get a chance to see one. Post Extras:       Uwe Pilz scholastic sledgehammer Reged: 05/16/08 Loc: Leipzig, Germany Re: Hesiodus ray [Re: Tommy5]       #2918907 - 02/10/09 01:54 AM Edit   Reply   Quote Quick Reply   Dear Frank, there exist a page in the net which gives the times of Hesiodus ray: http://www.lunar-occultations.com/rlo/rays/rays.htm Unforunately, not all times for Europe were given. So I decided to calculate the dates by myself. In many publications Harry Jamiesons Lunar Observer's ToolKit is recommended for this, but a free version seemed not to exist. I sended Harry an email, but got not an answer. Finally I found an old DOS version of this programs. The algorithms are correct, so you can use it without limitations: http://luna.uai.it/Duomi/html/body_download.htm Post Extras:       frank5817 Postmaster Reged: 06/13/06 Loc: Illinois Re: Hesiodus ray [Re: Uwe Pilz]       #2918915 - 02/10/09 02:10 AM Edit   Reply   Quote Quick Reply   Uwe, Thank you very much. I do know these sites associated with ALPO and have used them in the past myself. I was just wondering if you used them or other sites or if you just happened to catch the ray by sheer good luck. You answered my question. I have stumbled on this crater sunlight rays more often by luck. It seems that when I plan in advance I'm always clouded out. Thanks. Frank Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 1 registered and 4 anonymous users are browsing this forum. 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