Venus on 27th April 2020 (RGB)

Ive started to use an Atmospheric Dispersion Corrector to remove the red and blue fringes seen around bright planets, particularly at low elevations as the thicker atmosphere there acts like a prism and separates out and smears the colours - this effect is particularly pronounced at the blue end of the spectrum and can affect ultraviolet imaging as well.

 

This image was taken with a colour ZWO ASI224MC camera that I used at the start of the session to set up the ADC.

 

There was a small red rim on the convex edge of the planet which I didnt notice onscreen at the time - easy enough to remove with lens correction tools in Photoshop.

 

FireCapture software comes with a tool to set up ADCs properly which I should be using rather than just my eyeballs.

 

I was happy with my subsequent IR and UV runs but there was no additional detail to be seen so Ive just posted this image.

 

Ive managed to shorten my imaging train by using some direct T2 connections rather than 1.25" nosepieces into clamps so focal length is now about 4500mm which is where I want.

 

Astrometry:

Illuminated fraction = 0.277

Diameter = 37.0 arcsec

Light travel time = 3.8 minutes

Elevation = 29 degrees

Elongation from Sun = 39.9 East

 

FireCapture v2.6 Settings

------------------------------------

Camera=ZWO ASI224MC

Filter=L

Profile=Venus

Diameter=36.95"

Magnitude=-4.52

FocalLength=4400mm

Resolution=0.18"

Date=270420

Mid=200903.169

Duration=60.009s

Frames captured=6824

ROI=816x816

FPS (avg.)=113

Shutter=0.174ms

Gain=375 (62%)

HighSpeed=on

Gamma=50 (off)

Histogram=74%

Sensor temperature=16.6°C

Done