Sun Halo

 

Some halo's around the Sun this late afternoon:
- 22° halo

- Sundogs

- Upper tangent

- Circumzenithal arc

- and below the circumzenithal arc touches the supralateral arc

The supraleteral arc is not quit circular and thus I guess it's not the 46° halo.

Millky Way - Study Butte (Texas)

 

Selection of three pictures of the milky way taken in a bortle 1 location in Study Butte (near Big Ben National Park, Texas).
Setting:
Nikon D7500, f/3.5, 10mm, ISO1600, 60s exposure time
Skywatcher Star Adventurer 2i on Manfrotto Tripod
Editing unsing CS4

Milky Way - Study Butte Texas

 

Image of Milky Way taken in Study Butte near Big Bend National Park (Texas).
Setting :

Nikon D7500 f/3.5 10mm ISO1600,  60s

Star Adventurer 2i on Manfrotto tripod

Editing : CS4

ATT Essen: One month to go

On May 4th, the annual European largest Astronomy Fair will take place in Essen (Germany). The ATT (Astronomie udnd Technicktref) is the place to be when looking for both new and second hand astronomy material.

See for more this link.

Sol'ex images : Impact of fps on X/Y ratio

Impact of exposure time on the X/Y ratio of Sol'ex solar image.
According SIMSPEC SHG version V1.6, by Ken Harrison the theoretical result of X/Y ratio 1 should be 4.43ms or 225fps for my set up : TLAPO60/360 f/6 with ASI290MM and scanspeed 16x.

When lowering the speed form 3.38 to 4.04, the shape moved from an ellips towards a circle. Not yet perfect but it proves the theory. 

Sun H-Alpha using Sol'ex

This morning the clouds dissapeared for about half hour, enough to make some images of the sun using my Sol'ex. 

Setting: 

* TLAPO60/360 f/6 with ASI290MM on Sol'Ex in H-alpha

* Software : Sharpcap 

* Tilt : +3.5 to -4,5°

* ROI : 1936 *276, Mono16, binning 1x1

* Exposure time between 294fps and 245fps
* Speed 16x 

* Analyzing : Inti and JSolex

* Editing and stacking : CS4, AS4!, AstroSurface

Comet 12P/Pons Brooks

Finally, I was able to set up my EQAZ6 mount to capture the Comet 12P/Pons Brooks. Unfortunately a lot of clouds but I could use 3 pictures of each 60s exposure time.

Setting: TLAPO80/480 f/6 with ASI2600MC

Filter: Optolong L-Pro

Lights: 3x60s

Software: SharpCap 4.1, APP, CS4