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1. Alcyone (Eta Tauri, η Tau, 25 Tau) in the Pleiades open cluster, spectral type B7IIIe+A0V+A0V+F2V.
This star is a multiple system, but my goal of observation was the H-alpha profile of the main component:
Horizontal axis scaled to radial velocity:
2. Pleione (28 Tau, BU Tau) also in M45, spectral type B8Vne, variable star, the brightness changes in range: 4.83 - 5.38 V.
This is the faintest star, which I observed with using APO 107/700 & Low Spec spectrograph 1800 l/mm.
It was difficult, but obervation was positive (high gain, exposure time 4 min):
3. Tianguan (Zeta Tauri, ζ Tau), spectral type B1IVe+G8III: (mark ":" according to the VSX database means uncertainty).
This is an eclipsing binary with variability type E/GS+GCAS, period is 133 d. The brightness changes in range: 2.80 - 3.17 V.
4. Cih, Tsih (γ Cas), spectral type B0.5IVpe, variable star with a magnitude range of 1.6 to 3 V:
5. Alnitak (Zeta Orionis, ζ Ori), spectral type O9.5Ibe+B0III. Variable star with a magnitude range of 1.74 to 1.77 V.
Spectral lines have characteristic P Cygni profile, below H-alpha:
I first came across the term ‘Solargraphy’ on this forum and was directed to website dedicated to the art of Solargraphy.
This is a basic photographic method of recording the path of the Sun as the year progresses. This image commenced on 22 June 2019, the day after the Summer Solstice when the Sun was at its highest altitude in the noon day sky and finished on 22 December 2019, the Winter Solstice when the Sun is at its lowest point at noon. The silhouette of the neighbouring properties can also be made out in the picture.
Using a basic pinhole camera I was able to record every clear day the track of the Sun across the southern sky, each day the Sun’s altitude was getting slightly lower.
Whilst the camera is basic, the main challenge is to avoid water damage and as you can see from the image some rain has managed to find its way inside. However, the pinhole camera is cheap to make with the following purchases made via Amazon;
100 cable ties £5.49
20 35mm plastic film canisters £8.88
100 sheets of Ilford Multigrade 4 glossy photographic paper £25.98
The remaining items were already in the house (drill bit, tinfoil, electrical and duct tape).
Given the potential for disaster I made two pinhole camera’s and one of them provided this image, the other was washed out due to rain water getting in. Making more than one camera certainly improves the chances of success. The camera's themselves were attached with cable ties to the down pipe of the guttering and facing South.
Anyone wishing to learn more about Solargraphy and how to construct the pinhole camera should check out Tarja Trygg's website http://www.solargraphy.com/index.php .
By Mandy D
I've just bought a Daystar Solar Scout 60mm DS for H-alpha imaging of the Sun. I am now looking for a suitable camera to use with it. I know I could use my DSLR, but for H-alpha that is not going to give best results, so am looking for a dedicated monochrome imaging camera. I have identified the ZWO ASI178MM as a possibility that fits my budget and has a large enough (I think) sensor to image the entire Solar disc if I use a 0.5 focal reducer which will give me a total focal length of 465 mm.
Does anyone have any experience of this camera in this application, or know if it will be suitable? I know it does not have an IR blocking filter, which I understand is an advantage for H-alpha. The spec is available here: