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Swansea Astronomical Society Blog

Wednesday, May 27, 2020

 

H-alpha solar images

I had another go at the sun using the Quark and Altar 80mm telescope, this time using my new Altair Hypercam 174m. It was attached to the Quark via an Altair tilt adapter.

No sign of any Newton's rings.

The best 60% of 1000 frames, stacked in AS!3, sharpened in IMPPG then finalised and coloured in PS3. Flats where applied when capturing with Firecapture. It's very easy for a partial disc.

The new camera shows an amazing amount of detail and a larger field of view.

The image is a 2 pane mosaic

Showing surface structure and prominences

Negative view

Anne Startup
 

2.9% Venus and the 9.5% waxing, crescent Moon on May 25th

Click on an image to get a closer view

AstroDMx Capture for Linux capturing a 50,000-frame SER file of the 2.9% crescent Venus with a Skymax 127 Maksutov


2.9% crescent Venus

AstroDMx Capture for Linux capturing a 1500-frame SER file of a section of the Moon with a Skymax 127 Maksutov.

9.5% waxing, crescent Moon

9.5% waxing Moon over the Afan Valley mountains using a Bridge camera


Waxing crescent Moon with a Pentax K-x DSLR and an 80mm, f/5 refractor
showing earthshine

Steve Wainwright


Tuesday, May 26, 2020

 

H-alpha solar sketch

Using an 80mm, f/7 refractor, and a 30mm eyepiece.


Jim Startup
 

The Moon, Venus, Mercury and ISS passes

Used my ETX 125 and my EDF60 and my Sony A77 MKII camera to take some of the Moon, Venus and Mercury last night, and ISS passes.

Click on an image to get a closer view







Chris Bowden

Monday, May 25, 2020

 

H-alpha images of the Sun

Both images were the best 50% of 500 frames using an Altair GPCam, using a Quark on an Altair Ascent 80ED refractor. Captured with Firecapture using flat-fields. Sharpened in IPPG and finalised in PS3.

Click on an image to get a closer view.



Anne Startup
 

Conjunction of the crescent Moon, Mercury and Venus with ISS passes

I managed to get enough gaps in the clouds last evening to capture the 4.4% slender crescent Moon with Mercury and Venus which looked rather splendid in the evening twilight sky. Images were taken with a Sony A77 MKII using a 16 to 50mm F2.8 lens.

I saw the ISS go overhead around 22:10 in a still quite bright sky and decided to image the next pass at 23:45 to see if I could see the Japanese Transfer Vehicle (HTV-9) which is heading to dock with it in a few hours from now. Lo and behold I could see it trailing the ISS some distance away as the ISS made its way from Cancer to Leo. The images have also picked up the Beehive Cluster (Praesepe) in Cancer too.

I watched them pass by Arcturus and continued to image as I saw them continue onwards towards the terminator between Serpens and Ophiuchus where I saw the ISS fade out as another satellite intersected its path.

Images again taken with my Sony A77 MKII undriven with 15 second exposures. I added the gifs made in Adobe ImageReady to highlight the movement of the various crafts.

Click on an image to get a closer view















Chris Bowden

Thursday, May 21, 2020

 

6.5% crescent Venus with AstroDMx Capture for Linux

A ZWO ASI178MC CMOS camera was fitted into a Teleview 3x Barlow and placed at the Cassegrain focus of a Skymax 127 Maksutov. The scope was mounted on a Celestron AVX mount.

AstroDMx Capture for Linux was used to capture a 50,000-frame SER file of the 6.5% crescent Venus.

Click on an image to get a closer view

AstroDMx Capture for LInux capturing a 50,000-frame SER file of Venus


The best 2% of the frames in the SER file were stacked in Autostakkert! 3.10, wavelet processed in Registax 6, and post processed in the Gimp 2.10.

6.5% crescent Venus

Steve Wainwright and Nicola Mackin

 

H-alpha solar sketch

I have been using my Quark eyepiece with a 80mm f/7 refractor and a 30mm eyepiece.

Click on the image to get a closer view,


Jim Startup
 

Solar image in H-alpha

I've been practising H-alpha solar imaging. The image is taken with my Altair Hypercam 178M on a Lunt 50THa solarscope mounted on a Cem60ec mount.

Imaged using Firecapture. I imaged the disc with the histogram at around 80%. I followed a technique to bring out the prominences using IPPG and Photoshop.

Click on the image to get a closer view.


Anne Startup

Wednesday, May 20, 2020

 

H-alpha activity on the Sun

A Solarmax II 60, BF15 H-alpha scope was mounted on a Celestron AVX mount. A DMK21AU04.AS was fitted with the lens from a Cemax x2 Barlow on the camera nosepiece.

1500 frame SER files were capture using AstroDMx Capture for Linux, exposed for the disk and for the prominences.

Click on an image to get a closer view.

Screenshot of AstroDMx Capture for Linux capturing a SER file exposed for the prominences

Screenshot of AstroDMx Capture for Linux capturing a SER file exposed for the disk

The best 90% of frames in the SER files were stacked in Autostakkert!, wavelet processed in Registax 6, post processed and combined in the Gimp 2.10.


The data were inverted to give another way of looking at the image.

The DMK camera was fitted in a Televue 3x Barlow and a 1500-frame SER file exposed for the prominences was captured with AstroDMx Capture for Linux.

DMK with 3x Teleview Barlow


Screenshot of AstroDMx Capture for Linux capturing a SER file exposed for the prominences

The best 90% of the frames in the SER file were stacked in Autostakkert, wavelet processed in Registax 6 and post processed in the Gimp 2.10. A virtual occultation disk was placed over the overexposed disk so that the prominences can be better seen.


Steve Wainwright

Saturday, May 16, 2020

 

Venus with an ETX 125EC

Scope: ETX 125EC; Camera: QHY5L-II;Capture software: EZPlanetary on Dell Mini Windows XP PC.

Venus – started imaging at dusk when sky was quite bright @ 21:20 with Venus at 19.5° elevation
Phase: slender crescent 11.9% illuminated

AVIs captured with and without a Barlow.


11.9% crescent Venus


Chris Bowden


 

11% crescent Venus with a DFK 21AU04.AS CCD camera and AstroDMx Capture for Linux

A Skymax 127 Maksutov was mounted on a Celestron AVX mount. A DFK 21AU04.AS CCD camera with a 2x Barlow lens screwed on the camera nosepiece was combined with a 2.5x Barlow and placed at the Cassegrain focus of the Maksutov.

AstroDMx Capture for Linux was running on a Fedora Linux laptop.

A 10,000-frame SER file of the 11%  crescent Venus was captured at 60 fps. To ensure the fastest possible frame-rate, AstroDMx Capture was set to fully debayer the screen display, but to capture an undebayered SER file.

Click on an image to get a closer view

Screenshot of AstroDMx Capture for Linux capturing a 10,000 frame SER file 
from the DFK camera

The best 100 frames from the 10,000 frame SER file were stacked in Autostakkert!, and post processed in the Gimp 2.10

11% crescent Venus

Steve Wainwright and Nicola Mackin

Friday, May 15, 2020

 

Stochastic 'Lucky' Imaging of Venus with AstroDMx Capture for Linux

Click on an image to get a closer view.

Venus over the Afan Valley. The star Elnath is visible above it

Using a Skymax 127 Maksutov mounted on a Celestron AVX mount with a ZWO ASI178MC camera fitted with a 2.5x Barlow.

AstroDMx Capture for Linux was used to capture a 50,000-frame SER file of the 11.9% crescent Venus with a region of interest of 800 x 608 at 166 fps. To ensure the fastest possible frame-rate, AstroDMx Capture was set to fully debayer the screen display, but the capture an undebayered SER file. As Autostakkert! can debayer the SER file when stacking, it makes no sense to capture RGB frames, which are 3 times the size for saving, and therefore can slow down the capture process. The colour information is encoded in the RAW frames of the SER file.

Screenshot of AstroDMx Capture for Linux capturing data on Venus.

The best 1% of the frames in the file were stacked in Autostakkert! 3.1 with RGB channel alignment. The final image was wavelet processed in Registax 6 and post processed in the Gimp 2.10. This process of collecting large numbers of high speed frames, discarding all but the best, keeping sufficient to take advantage of the increase in signal to noise ratio with stacking, is called Stochastic ('Lucky') imaging.

To find out more about Stochastic, 'Lucky' imaging, click HERE.

11.9% crescent Venus

Steve Wainwright and Nicola Mackin

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