· 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 frank5817 Postmaster Reged: 06/13/06 Loc: Illinois The Sea of Moisture through the Fog       #3339022 - 09/17/09 09:26 AM Attachment (76 downloads) Edit   Reply   Quote Quick Reply   Sea of Moisture through the Fog One month ago (August 15) I began a sketch I was unable to complete due to interfering clouds and lucky for me early on the morning of September 13 with the moon at approximately the same phase, I completed the graphite sketch of most of the Mare Humorum basin (380 km.). This impact basin is a different shape and somewhat smaller in size than Mare Crisium (600 km.). Research mapping data puts the age of this sea at about 3.9 billion years, a Nectarian period formation. The floor is flooded over by a thick layer of basaltic lava especially over the central region. Additionally a number of large interesting craters ring the margins of this basin. At the southern edge (12 o’clock position in the sketch) you can see craters: Vitello, Lee and Doppelmayer. At the north edge (6 o’clock position) you can see crater Gassendi and on its rim Gassendi A. The lighting on both occasions was excellent for viewing the lava ridges on the eastern side of the maria. Both days were excellent for viewing a steady lunar image with a notable amount of fog on the second viewing morning. Sketching: Sketch was made over two observing sessions For this sketch I used: white sketching paper 10”x 8”, HB, 4B, 6B graphite pencils, a blending stump and a plastic eraser and eraser shield. After scanning, Brightness was decreased (-2) and contrast increased (+2) using Microsoft Office Picture Manager. Telescope: 10 inch f/ 5.7 Dobsonian and 6 mm eyepiece 241x Dates: 8-15-2009, 9:30-10:25 UT; 9-13-2009, 10:00-11:10 UT Temperature: 15° C (59° F), 16° C (61° F) clear, calm, then cloudy the first day, Very humid both days, dense fog on the second day Seeing: Antoniadi II-III Colongitude 205.5°, 200.2° Lunation 24.27 days, 24 days Illumination 32.7 %, 35.3 % Frank McCabe Post Extras:       Jef De Wit Carpal Tunnel Reged: 03/06/09 Loc: Hove, Belgium Re: The Sea of Moisture through the Fog [Re: frank5817]       #3339159 - 09/17/09 10:50 AM Edit   Reply   Quote Quick Reply   Long live the fog! Beautiful sketch. Post Extras:       Tom Machtemes super member Reged: 06/09/08 Loc: Evergreen Park, Ill. Re: The Sea of Moisture through the Fog [Re: frank5817]       #3339182 - 09/17/09 11:02 AM Edit   Reply   Quote Quick Reply   Frank, Nice sketch. , Tom Post Extras:       Jeremy Perez Carpal Tunnel Reged: 08/12/04 Loc: Flagstaff, Arizona, USA Re: The Sea of Moisture through the Fog [Re: Tom Machtemes]       #3339225 - 09/17/09 11:22 AM Edit   Reply   Quote Quick Reply   Frank, it's great to see one of your graphite Lunar sketches. This is a fantastic drawing. Post Extras:       kraterkid Post Laureate Reged: 03/07/05 Loc: Jacumba, California Re: The Sea of Moisture through the Fog [Re: Jeremy Perez]       #3339384 - 09/17/09 12:43 PM Edit   Reply   Quote Quick Reply   Gorgeous graphite rendering of Mare Humorum Frank! The variation in the surface albedo or tonal values of the mare are very beautifully captured as are the dorsae or wrinkle ridges that arc across the lava flooded basin. Gassendi is modeled with such deftness, having a 3D quality to it. Looks like the libration really matched nicely, I can tell you carefully planned ahead for your second sketching session. One of the wonderful lessons to take from this awesome sketch is that when you can't finish a sketch in a particular session, use your VMA or similar software to locate a phase/libration that would closely match your unfinished sketch. Sometimes that may only be a month as in your case Frank, and sometimes you may have to wait several months, but the results can be very rewarding as you have beautifully demonstrated in this exquisite graphite sketch my friend. Post Extras:       frank5817 Postmaster Reged: 06/13/06 Loc: Illinois Re: The Sea of Moisture through the Fog [Re: kraterkid]       #3339430 - 09/17/09 01:05 PM Edit   Reply   Quote Quick Reply   Jef, Tom, Jeremy and Rich, Thank you all for the nice words about my sketch. The moon on the two dates of the sketch was much alike but not identical. I have another one from early spring I may never finish. It is good to know how much time you have in advance so you don't bite off more than you can sketch. The fog did help with the intermediate tones but a polarizing filter would have worked with no fog. Frank Edited by frank5817 (09/17/09 01:06 PM) Post Extras:       Tommy5 Carpal Tunnel Reged: 03/28/04 Loc: Chicagoland Re: The Sea of Moisture through the Fog [Re: frank5817]       #3340381 - 09/17/09 09:13 PM Edit   Reply   Quote Quick Reply   Very nice lunar sketch one of your best, thanks for sharing. Post Extras:       perfessor professor emeritus Reged: 12/30/07 Loc: Northern Illinois Re: The Sea of Moisture through the Fog [Re: Tommy5]       #3340389 - 09/17/09 09:19 PM Edit   Reply   Quote Quick Reply   Very nice Frank. Gassendi is one of my favorites, and you have placed it so well in its environment. Post Extras:       frank5817 Postmaster Reged: 06/13/06 Loc: Illinois Re: The Sea of Moisture through the Fog [Re: perfessor]       #3340447 - 09/17/09 10:13 PM Edit   Reply   Quote Quick Reply   T5 and Tom, Thank you both for your comment about my sketch. I was happy to be able to finish it. Frank Post Extras:       CarlosEH Postmaster Reged: 01/19/05 Loc: Pembroke Pines, Broward County... Re: The Sea of Moisture through the Fog [Re: frank5817]       #3340546 - 09/17/09 11:12 PM Edit   Reply   Quote Quick Reply   Frank, An outstanding observation of the Mae Humorum basin. The crater walls and shadows are well rendered. The Mare Humorum ridges (lava flows) look very nice as well. Thank you for sharing it with us all. Carlos Post Extras:       frank5817 Postmaster Reged: 06/13/06 Loc: Illinois Re: The Sea of Moisture through the Fog [Re: CarlosEH]       #3341819 - 09/18/09 05:27 PM Edit   Reply   Quote Quick Reply   Carlos, Thank you, it was great fun to sketch this region of the moon. With the waning riding high this time of year, I just had to get out in the wee hours to sketch. Frank Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 1 registered and 7 anonymous users are browsing this forum. 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