· Get a Cloudy Nights T-Shirt · Submit a Review / Article    Click here if you are having trouble logging into the forums Cloudy Nights - Official Forums of the 2009 International Year of Astronomy 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] Forum Archives · Entrance · Main Index · Search · New user · Who's Online FAQ · Calendar Astrophotography and Sketching >> Sketching Previous   Index   Next   Threaded   Pages: 1 Starobserver member Reged: 06/04/09 Posts: 21 Eta Cassiopeia: yellow / red main sequence dwarfs       #3313064 - 09/03/09 02:19 PM Attachment (21 downloads) Edit   Reply   Quote Quick Reply   Sketch and observing report Eta Cassiopeia Eta Cassiopeia is a strikingly colourful pair of stars. Eta's primary is bright yellow, while its dim companion looks deep orange with a hint of red. This attractive couple lies within an asterism that, using the right magnification, looks like a small dolphin (see my sketch for details). The dolphin asterism consists of 13 stars, oriented southwest northeast, with eta Cassiopeia situated at the tip of the tail fin. Eta Cassiopeia was allready easily split in the 22mm Nagler. After trying all possible magnifications, I liked the view of both the double and the asterism best using the 12mm Nagler T4, giving a magnification of 133x and a field of view of 37'. For more details on this interesting couple of yellow and red main sequence dwarfs, its discovery, the place on the main sequence etc. please follow this link for the full report. -------------------- Clear Skies! Math Starobserver http://www.backyard-astro.com/blog http://www.starobserver.eu Edited by Starobserver (09/03/09 02:19 PM) Post Extras:       frank5817 Post Laureate Reged: 06/13/06 Posts: 4093 Loc: Illinois Re: Eta Cassiopeia: yellow / red main sequence dwarfs [Re: Starobserver]       #3313761 - 09/03/09 09:11 PM Edit   Reply   Quote Quick Reply   Math, This is another beautiful pair. Always gets thoses Ooos and Ahas at star parties. What makes this so nice is your great sketch that captures the colors and beauty of the pair.EXCELLENT POST. Frank -------------------- my gallery Post Extras:       Tommy5 Carpal Tunnel Reged: 03/28/04 Posts: 1823 Loc: Chicagoland Re: Eta Cassiopeia: yellow / red main sequence dwarfs [Re: frank5817]       #3313854 - 09/03/09 10:12 PM Edit   Reply   Quote Quick Reply   Very nice sketch of this colorful pair. Post Extras:       kraterkid Post Laureate Reged: 03/07/05 Posts: 4551 Loc: Jacumba, California Re: Eta Cassiopeia: yellow / red main sequence dwa [Re: Tommy5]       #3314816 - 09/04/09 12:13 PM Edit   Reply   Quote Quick Reply   Superb Math! Lovely color in this unique pairing. -------------------- Rich My CN Gallery Post Extras:       desertstars Please stand by... Reged: 11/05/03 Posts: 34586 Loc: Tucson, AZ Re: Eta Cassiopeia: yellow / red main sequence dwa [Re: kraterkid]       #3314839 - 09/04/09 12:25 PM Edit   Reply   Quote Quick Reply   A fine rendering of one of my favorite double stars! -------------------- Tom W. Collinder's Catalog Jewels in Dark Settings Post Extras:       rolandlinda3 Carpal Tunnel Reged: 01/24/06 Posts: 2233 Loc: Crozet VA 22932 Re: Eta Cassiopeia: yellow / red main sequence dwa [Re: desertstars]       #3314870 - 09/04/09 12:37 PM Edit   Reply   Quote Quick Reply   Very nice...a clean sharp sketch. -------------------- Roland Sketches in members galleries: rolandlinda3 Inspirational stories/sketches at: www.christworksministries.org Post Extras:       Jef De Wit super member Reged: 03/06/09 Posts: 125 Loc: Hove, Belgium Re: Eta Cassiopeia: yellow / red main sequence dwa [Re: rolandlinda3]       #3315057 - 09/04/09 02:07 PM Edit   Reply   Quote Quick Reply   Math, keep on posting your beautiful sketches. I like them a lot. -------------------- Clear skies, Jef De Wit 7x50 bino, Meade ETX-70 & Orion Optics UK 12" Dobson "Bright skies aren't empty skies" (James Mallaney) Post Extras:       CarlosEH Post Laureate Reged: 01/19/05 Posts: 4142 Loc: Pembroke Pines, Broward County... Re: Eta Cassiopeia: yellow / red main sequence dwa [Re: Jef De Wit]       #3315182 - 09/04/09 03:08 PM Edit   Reply   Quote Quick Reply   Math, An excellent and beautiful observation of Eta Cassiopeia. Thank you for sharing it with us all. Carlos -------------------- Post Extras:       Edwin Quiroga professor emeritus Reged: 01/31/08 Posts: 612 Loc: Miranda, Venezuela Re: Eta Cassiopeia: yellow / red main sequence dwa [Re: CarlosEH]       #3318549 - 09/06/09 01:32 PM Edit   Reply   Quote Quick Reply   It´s a coincidence that I discovered this pair panning Cassiopeia one week ago with my Pan 35. I could discern a strange form at 17x in this star. When I put my XW10 (60x) I got its real double star nature, with a second component very faint with respect the brighter. Really nice sketch, Math! How do you achieve the glossy effect around the brighter stars? -------------------- TeleVue 85 w/FeatherTouch Televue Panoptic 35 Pentax XW (3.5, 5, 7, 10, 14, 20) Pentax XO 2.58 Post Extras:       Starobserver member Reged: 06/04/09 Posts: 21 Re: Eta Cassiopeia: yellow / red main sequence dwa [Re: Edwin Quiroga]       #3318652 - 09/06/09 02:48 PM Edit   Reply   Quote Quick Reply   Hi Edwin, I scan my sketches into Photoshop. On separate layers I add the color and the glow of the brighter stars. I get the glow with a brush two or three times as large as the star. The mode I use is the screen mode with the opacity set to 5% and the flow set to 10%. Of course you have to select the right color first. Clear skies Math -------------------- Clear Skies! Math Starobserver http://www.backyard-astro.com/blog http://www.starobserver.eu Post Extras:       Edwin Quiroga professor emeritus Reged: 01/31/08 Posts: 612 Loc: Miranda, Venezuela Re: Eta Cassiopeia: yellow / red main sequence dwa [Re: Starobserver]       #3318683 - 09/06/09 03:08 PM Edit   Reply   Quote Quick Reply   A nice job indeed! Post Extras:       Pages: 1 Previous   Index   Next   Threaded   Extra information 1 registered and 4 anonymous users are browsing this forum. 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