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Showing results for tags 'trapezium'.
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First, I'd like to say that I'm in wet diapers as far as imaging goes, just making a few baby steps. Tonight was clear and not as freezing cold as has been recently, so I took the kit into the barnyard where I have a fairly decent sky. I just added Bob's Knobs to my Edge HD 8", and had done an indoor collimation; I wanted to fine tune it outside as one goal of observing tonight. Another goal was trying out my new WO GT81 on the Moon, I haven't had the opportunity to use it for lunar because of recent weather.....and no Moon. So, one of the last things tonight was to swing over to M42 after the Moon got too low to observe. I used the frac to observe wide-field for a while, then put the Edge on the mount; to check collimation I swung over to Castor, and clearly split it with a 25mm Plossl. Then I went to Capella, defocused so I could get the 'donut', and it was so perfect as I closed it down while focusing I left the collimation as it was. Skewing over to M42, I started with a 25mm Plossl in a 2" diagonal and worked my way up, ending with my 2" 2.5x Luminos barlow and a 13mm Ultima EP, giving me 385X. Visually, I could split 'E' and 'F' in the Trapezium, so I thought I'd see if I could get an image through the EP with my DSLR, since the Ultima is threaded for a T-ring. This is a single image, 2.5 seconds at ISO 6400. Less exposure did not bring out 'E' any better, and 'F' is showing as a bulge in its companion. More exposure hid both as the Trapezium stars were too bright.
Clear night forecast, but -4 to -5 degree. My backyard has about an hour's view nearly due south, therefore finding the pup seems to be worth a try. 80ED on AZ4 is set up around 11 o'clock, half an hour later, Rigel is in observing field. According to recommendations, it's a good practice to split Rigel first since the pup is about the same seperation as Rigel double. starting from 10mm BCO, Rigel B is clear splitted in 135X with BCO 10mm +2.25x barlow. seeing is quite good actually. Some minutes warm-up back in the house, M42 is right there. using the same EP+barlow combo, the Trapezium C seems not exactly on focus, a little tweek on focuser, the F shows up! looking closely to the side of A and B, there lies E! Actually my perception is that E is a little fainter than F, not sure if it's correct. Any, what a nice surprise, got E and F on my first shot with 80ED on Trapezium! Half an hour later, Sirius is there, flashing in colors, but not at all as fiercely it usually does. Using the same EP combo, focus on Sirius, it just flashs irregularly, no hint of star near it. then, there comes some brief seconds, there are many nice and round diffraction rings around Sirius, still nothing. When Sirius is treed out, I have to pack things without finding the pup. though still very satisfied.
The new SW Evostar ED150 is really getting some use here after my initial tests. We are having a good run of clear skies. This morning I got up at 3:30 am to do a lunar imaging run (see elsewhere). After that I quickly set up on M42 as it was near the local meridian. Using my ES 4.7mm 82' EP (255x) I concentrated on the Trapezium first. I was staggered by the view not only because of the detail under the Moon but because all 6 stars (A to F) were clearly visible immediately and pin sharp sitting in a greenish mist. Here is my really quite poor chalk sketch of the approximate view hastily drawn on my obsy blackboard wall (ignore the screws in the ply): Checking with the detailed Whitepeak Observatory graphic the stars I believe in clockwise order are from the top right: B, D, F, C, A, E. I have often tried to view the 6 stars before with my SCT 9.25" but this scope revealed them with ease. Star C (Theta-1 C Orionis) is described in the same graphic as an Extreme star: 40 Solar Masses; Surface temp 40,000K, the hottest known <6mag star; 210,000x sun's luminosity and an O6 spectral type. I then swapped to my 2" 24mm ES 82' EP to view M42 but that view was swamped somewhat by moonlight so I will have to wait a while to try that.
This is my first play with Photoshops 'Layer' command. An original single frame capture was copied to a new layer above my stacked and manipulated image. I then used the history eraser tool to remove the area around the trapezium to show the adjusted layer below but kept the original brightness of the trapezium stars from the single frame layer - if that makes sense?!? That way I can show more of the nebulasity but have kept the trapezium stars from burning out.
© 2013 Bryan Harrison