Here is an attempt at narrowband imaging with the 10″ f4.8 last night. The light frames total 115 minutes. The palette used is R and L = H alpha, G = 0III, B = SII. Almost all the nebula information is in the H alpha, there’s just a trace of SII emission and little trace of OIII, hence it’s basically red. Processing was in Nebulosity and Photoshop CS4 with Neat Image plugin. (Click to enlarge image)
Here’s my full disk from Saturday. Seeing was not that good.
There’s a lot of scattered light. This is due to the blocking filter. I’ve been finding that my Lunt blocking filters have gradually degraded over time, and are no longer transparent, but “crazed” on the surface of the larger glass component (the one towards the camera or eye). I wonder if anyone else has found this.
I managed to catch an astonishingly fast-moving prominence here. I imaged it for 1 minute runs at 5 minute intervals, but really this was too slow, it was changing so quickly, that shorter runs might have been better. It was moving visibly on screen, and 20 minutes after I first saw it it was dissipating into space. A rough calculation shows it was travelling of the order of 10,000 miles per minute, or 0.1% the speed of light. The frames are about 25% of the Sun’s diameter.
Here’s some images of a rapidly changing nearly-detached prominence on the Sun’s eastern limb.
Taken with at a focal length of 1440mm with a 100mm refractor, double-stacked with Lunt 50mm filters using home-built adaptor, plus 1.6x Barlow: a nice long optical train, as shown in the photo, with the system mounted on the C-14 in Stag Lane Observatory.
Nova Delphinus imaged with a Canon EOS 400D and old Hanimex 28mm SLR wide-angle lens. There was some interference from a gibbous Moon (Click to enlarge).
Playing solar catch-up, here’s the Sun in H alpha and infra-red on the same day in June. The spot group shown in the IR image corresponds to the active area right of centre. Seeing was poor. (Click on images to enlarge.)
Dealing with a backlog of observations here: some nice sunspots imaged with a 5-inch SCT in IR 804nm. The image is not rectangular because I cut out a sensor dust mote. (Click to enlarge)
This is an image I took in March but have only just got round to processing. (Click to enlarge)
A lot of activity visible. Very spotty in white light as well, but didn’t get a white light image.
Here’s a classic object for this time of year, the ghostly Owl Nebula, in a false-colour image taken through H alpha and OIII filters.
It gives the impression of two spherical shells of gas displaced from one another, but, unlike some other planetaries, it has very little colour, looking much the same in H alpha as OIII light.
Taken over three nights, and processed with Nebulosity 2.5.3 and Photoshop CS4. (Click to enlarge)