Twin Paradox Minkowski Diagram

A space time diagram or Minkowski diagram made of the Twin Paradox. I used my old fashioned graph paper to draw both "twin" situations.

Left : earth twin "leaving" the rocket twin
Right : earth twin "staying, and the rocket heading away (and returning)
Both believe  the other one is younger as they "see" the other one moving away.

 

Mars at opposition : use of Denoise

 My pictures from Mars at opposition (October 14th) are reworked using Topaz DeNoise AI.

Andromeda M31 5 sessions 244 minutes expoisure

 The Andromeda Galaxy M31 : picture from 5 sessions and total of 244minutes exposure. 

Mars to Opposition

During the night of October 13 to October 14, 2020 Mars came to Opposition. Seeing was moderate but with a couple of good moments. My best pictures are presented below. I added aswell a picture from Mars Mapper.

Setting : ASI ZWO224MC and TAL200K f/8.5 with ADC and Barlow x2. AVI movies 127 fps for 60s. Stacking with AutoStakkert! and 33% of best frames are collected. Final editing using CS4.

Opposition Mars

Last night Mars came to opposition and clouds dissapeared after midnight. Moderate seeing but with some good moments. Not all picteres are edited, but a first impression.

Setting : ZWO224MC and TAL200K f/8.5 with ADC and Barlow x2. 127 frames per second. Stacking with AutoStakkert! and final editing using CS4.

Calsky C'est fini

Unfortunately, the astronomical bible on the web "Calsky" stopped providing their services. This means we need to find our data somewhere else ...

Andromeda Galaxy M31 - Total exposure 244minutes

This picture of the Andromeda Galaxy M31 is the result of a total of 317 individual pictures made in 5 different night sessions:
- 62 x 60s ISO2500

- 63 x 60s ISO4000

- 48 x 60s ISO6400

- 82 x 30s ISO6400

- 62 x30s ISO1250

So total exposure is 244 minutes. All pictures are made with Nikon D7500 and TLAPO80/480 f/6. Pictures with exposure time 60s are made with control software DigiCamControl. Stacking of Nef files using Astro Pixel Processor (APP). The stacked result (stretch - non saturated -Tiff32) was cropped and edited using CS4.