Swansea Astronomical Society Blog

Friday, October 19, 2018

 

69% waxing Moon terminator with a SVBONY SV105 camera and AstroDMx Capture for Linux

A low cost SV105 camera by SVBONY was fitted with an ND13 neutral density filter and placed at the Cassegrain focus of a Skymax 127 Maksutov scope. AstroDMx Capture for Linux, running on an Xubuntu laptop was used to capture 9, overlapping, 1000-frame SER files of the terminator of the 69% waxing, gibbous Moon as YUYV, mapped to greyscale and real-time flat-field corrected, to correct for pixel vignetting. The best 60% of the frames in each SER files were stacked in Autostakkert! running in Wine. The resulting images were stitched together in Microsoft ICE running in Wine and then wavelet processed in Registax 5.1 also running in Wine. The resulting mosaic of the terminator was post processed in the Gimp 2.10.

Click on an image to get a closer view

Equipment used for capturing the data




Screenshot of AstroDMx Capture for Linux capturing data



Terminator of the 69% waxing, gibbous Moon


Steve Wainwright & Nicola Mackin

Thursday, October 18, 2018

 

LRGB M71

12x5 minute subs using an SX H694 camera and a Wave 102mm telescope. Added to the RGB subs taken previously.  5x150s exposures for each R G B filter all binned 2x2, using an Atik 428 ccd camera and a Starwave 70EDT telescope.

Click on the image to get a closer view
M71

Anne Startup
 

60.1% waxing Moon with an SVBONY SV105, low cost camera and AstroDMx Capture for Linux

Tested the new SVBONY SV105 camera fitted with an ND13 neutral density filter, an f/5, 130mm Skywatcher 130PDS Newtonian and AstroDMx Capture for Linux. 

Screenshot of AstroDMx Capture for Linux
Click on the image to get a closer view


Three overlapping, 1000 frame SER files were captured of the 60.1% waxing Moon as YUYV, mapped to greyscale and real-time flat field corrected, to correct for Pixel vignetting. 
The best 60% of frames for each SER file were stacked in Autostakkert! running in Wine. The three resulting images were stitched in Microsoft ICE running in Wine and post processed in the Gimp and FastStone Image viewer


60.1% waxing, gibbous Moon.
Click on the image to get a closer view

Steve Wainwright & Nicola Mackin

Monday, October 15, 2018

 

Deep Sky Imaging with the Autonomous Robotic Telescope

Autonomous Robotic Telescope formerly Bradford Robotic telescope
COAST (COmpletely Autonomous Survey Telescope) consists of a 14 inch f/10 Schmidt Cassegrain telescope (a Celestron 14), equipped with an FLI ProLine KAF-0900 CCD camera, broadband and narrow-band filters, also mounted on a GM4000.

Exposure Time    120000 ms     
Filter Type      BVR   
Dark Frame       Instant        Site Name        Tenerife 2   
Telescope Type Name     Galaxy 
Telescope Name   COAST

Edited using their software then in Adobe Elements 11.

The Deer Lick Galaxy Group NGC 7331 


The Bubble Nebula NGC 7635 


The Fireworks Galaxy NGC 6946 

Colin Miles
 

NGC 7635 The Bubble Nebula

Celestron 9.25 SCT AVX, 0.63 Focal Reducer, Celestron Off-Axis Guider, ZWO ASI120MM guide camera, 8 images at 300 secs exposures captured with the Orion G3 DeepSpace Colour CCD camera, processed in Orion Studio Software and then in Adobe Elements 11.

NGC 7635 The Bubble Nebula

Colin Miles

Thursday, October 11, 2018

 

Furzehill Observatory

In our first meeting of the 2018/9 season, Ian Miller gave us a talk about the Furzehill Observatory. Ian is a distinguished observer who has been observing for at least 40 years. His main interest is variable stars.

Great to see all our members again after the long summer break!

Ian in action


Wednesday, October 10, 2018

 

NGC 7331 The Deer Lick Galaxy Group

Celestron 9.25 SCT AVX, 0.63 Focal Reducer, Celestron Off-Axis Guider, ZWO ASI120MM guide camera, 16 images at 300 secs exposures captured with the Orion G3 DeepSpace Colour CCD camera, then processed in Orion Studio Software and then in Adobe Elements 11 and Fitswork.


Click on the image to get a closer view

NGC 7331

Colin Miles


Sunday, October 7, 2018

 

M2 and M31 with AstroDMx Capture for Linux and a ZWO ASI178MC

M2 and M31 Captured with AstroDMx Capture for Linux, a ZWO ASI178MC 14 bit, USB3.0 CMOS camera and a Skywatcher Explorer 130 PDS 130mm, f/5 Newtonian mounted on a Celestron AVX EQ, GOTO mount.


Click on an image to get a closer view

M2

Part of M31

Steve Wainwright and Nicola Mackin
 

M33 with a ZWO ASI178MC and AstroDMx Capture for Linux

Stack of 15 x 60s exposures of M33, Captured with AstroDMx Capture for Linux, a ZWO ASI178MC camera and a Skywatcher Explorer 130 PDS 130mm, f/5 Newtonian mounted on a Celestron AVX EQ, GOTO mount.


Click on the image to get a closer view

M33


Steve Wainwright and Nicola Mackin

Tuesday, October 2, 2018

 

New Venue for the Swansea Astronomical Society. Trallwn Community Centre, Bethel Road, Llansamlet, Swansea SA7 9QP

The Swansea Astronomical Society has a new venue for its lectures. This is:

Trallwn Community Centre,
Bethel Road,
Llansamlet,
Swansea
SA7 9QP

click on the map to get a closer view

The venue is very convenient for the M4 motorway and it should be easier for speakers to get to us.

The site has good wheelchair access and a very good car park.



In addition to the most convenient parking possible, the site is monitored by CCTV. The location is very pleasant and we have kitchen facilities adjacent to the lecture room where we can make refreshments after a talk.
A good move and well done to Howard Davies the SAS chairman for setting it up.

The first talk of the season will be:
Thursday 11/10/2018
7pm

Ian Miller will give a lecture on the Furzehill Observatory

Sunday, September 30, 2018

 

NGC6946 Fireworks Galaxy

Celestron 9.25 SCT AVX, 0.63 Focal Reducer, Celestron Off-Axis Guider, ZWO ASI120MM guide camera, 39 images at 120 secs exposures captured with the Orion G3 DeepSpace Colour CCD camera, then processed in Orion Studio Software and then in Adobe Elements 11 and Fitswork.


Colin Miles

Thursday, September 27, 2018

 

Flat fields and low cost cameras

Many low cost cameras have small CMOS chips that exhibit pixel vignetting. Sometimes this manifests in a way similar to classical vignetting as with the Sweex Viewplus WC070 webcam
Sweex mono flat field

Sometimes the pixel vignetting manifests as a reverse of classical vignetting where the centre of the image is darker than the extremities, as in the SVBONY SV105 camera
SV105 desaturated flat-field

In each case, using flat fields corrects the image.

Sweex WC070 webcam
Two ways of attaching the camera to a telescope:

1. Camera mounted in a project box

2. Lens removed and c/cs ring attached to the camera's original case
Flat fields were captured with AstroDMx Capture for Linux using a Skywatcher Skymax 127 f/11.8 Maksutov with 1mm white styrene plasticard sheet in front of the scope. The scope was pointed towards the clear, eastern sky for illumination.
Capturing flat fields


Two, overlapping, 500 frame SER files were captured of the Cleomedes, Macrobius, Proclus, Picard region; and the Mare Crisium, Endymion, Lacus Temporis, Messala, Geminus, Bernouli region of the 96.3% waning Moon.
The best 80% of the frames in the SER files were stacked in Autostakkert!, wavelet processed in Registax 5.1 and stitched together in Microsoft ICE, all running in Wine. The final image was post processed in the Gimp 2.10.

Click on the image to get a closer view

An acceptable image, showing little compression artefacts was the final result.


SVBONY SV105


AstroDMx Capture for Linux was used to capture 500 frame SER files, flat field corrected in real time.
The best 80% of the frames in the SER files were stacked in Autostakkert! and wavelet processed in Registax 5.1 both running in Wine. The final images were post processed in the Gimp 2.10.
Two overlapping panes were stitched in Microsoft ICE running in Wine.

Click on an image to get a closer view

Mare serenitatis, Mare Tranquillitatis, Palus somni, Posidonius, Lacus, somniorum region. Two stitched, overlapping panes

Left to right; the lunar swirl Reiner Gamma, crater Kepler, crater Copernicus

Very little compression artefacts were noticeable in the images produced from this low cost imager.

Steve Wainwright & Nicola Mackin
 

Lunar studies on the 96% waning Moon

Celestron 9.25 SCT AVX, 2xTelevue Barlow, ZWO ASI120MM camera, 3000 images captured in Firecapture 2.5x64, 750 stacked and aligned in AutoStakkert!2.3, wavelets in Registax 6, then edited in Adobe Elements 11

Endymion, De La Rue 


Cleomedes, Burckhardt, Tralles 


Endymion, De La Rue, Strabo, Keldysh 


Langrenus, Atwood, Bilharz 


Petavius, Wrottesley

Colin Miles

Tuesday, September 25, 2018

 

Sketch of solar prominences in H-alpha light

Using a modified PST H-alpha scope and a 15mm eyepiece, the following sketch was made:

Jim Startup
 

M71

Altair Wave 102mm refractor and SXVR694 did 9x300s luminance only at full resolution.
Altair Wave 70EDT refractor and Atik 428 did 5x150s rgb binned 2x2.
Stacked in Maxim DL,  Further processed in Pixinsight and RGB combined with luminance.

Click on an image to get a closer view
RGB image of M71



LRGB image of M71


Anne Startup

Friday, September 14, 2018

 

Deep Sky Sketches

A Watec camera was used as an electronic eyepiece with a 150mm refractor.






Jim Startup
 

The Milky Way and M82

Milky way including Double Cluster image.
Canon 650d, 28-80 mm lens at 28mm, Ioptron Skytracker to track.
40x1 minute exposures, 10 darks subtracted in Deep Sky Stacker and stacked. Further processed in Pixinsight.
Click on an image to get a closer view



M82 taken at Kelling Heath on 5 September. Altair 60EDR refractor on Ioptron IEQ30 pro mount. Hypercam 178 cmos camera.
20x1 min lumance, 10x1 min each of RGB. Total 50 minutes exposure. 15 darks subtracted when stacking using Maxim DL. Further processed in Pixinsight.


Anne Startup

Thursday, September 13, 2018

 

Comet 21P/Giacobini-Zinner, the Moon, Mars, and the Eagle nebula with AstroDMx Capture for Linux

Comet 21P/Giacobini-Zinner was imaged using AstroDMx Capture for Linux with a ZWO ASI178MC camera attached to a Bresser Messier-AR-102-AS ED refractor, mounted on an iOptron Cube Pro AZ, GOTO mount. 16 bit TIFFs were collected with matching dark frames.

Click on an image to get a closer view.
Comet 21P/Giacobini-Zinner

The 11.6% waxing, crescent Moon was imaged in broad daylight with a DMK 37AUX273 camera fitted with an 850nm IR pass filter attached to a Skywatcher Explorer 130 PDS 130mm, f/5 Newtonian, mounted on a Celestron AVX EQ, GOTO mount. A 5,000 frame SER file was captured. The SER file was stacked and wavelet processed in Registax 5.1

11.6% waxing Moon

A ZWO ASI178MC camera, fitted with a 2x Barlow was attached to a Skywatcher Skymax 127 Maksutov. A 640 x 480 ROI was used and a 10,000 frame SER file was captured of Mars. The SER file was stacked in Autostakkert! 3, and wavelet processed in Registax 5.1. The image was post processed in the Gimp 2.10.

Mars

A ZWO ASI178MC camera was placed at the Newtonian focus of a Skywatcher Explorer 130 PDS 130mm, f/5 Newtonian, mounted on a Celestron AVX EQ, GOTO mount. 40 x 39s, 16 bit exposures of M16 were captured with matching dark frames. The images were stacked in Deep Sky Stacker running in Wine and post processed in the Gimp 2.10.

The Eagle Nebula

Steve Wainwright & Nicola Mackin
 

M27 The Dumbbell Nebula

Celestron 9.25 SCT AVX, 0.63 Focal Reducer, Celestron Off-Axis Guider, ZWO ASI120MM guide camera, 30 images at 120 secs exposures captured with the Orion G3 DeepSpace Colour CCD camera, then processed in Orion Studio Software and then in Adobe Elements 11.

M27

Colin Miles

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