Venus on the 24th April 2020 (IR(G)UV)

I know Im posting a lot of Venus images but Im trying to improve my technique.

 

Previously Ive used the Baader UV filter but here Ive used the Astrodon UVenus filter as it is said to have greater transmission in the UV. I was certainly able to reduce exposure times whilst keeping gain and %histogram the same - that resulted in many more frames per 2 minute video run.

 

I removed another one of the spacers in my Baader modular VIP Barlow so just x1.5 magnification here taking total magnification to about 6000mm f/30 and an image scale of 0.1 arcsec/pixel - still a bit higher than I would like.

 

Also getting comfortable using an ADC - usually needs just 0.5 or 1 "stop" for this target at 21 degree elevation.

 

Seeing was moderate for my site

 

Astrometry:

Illuminated fraction = 0.294

Diameter = 35.9 arcsec

Light travel time = 3.9 minutes

Elevation = 21 degrees

Elongation from Sun = 40.7 East

 

 

FireCapture v2.6 Settings

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

Camera=ZWO ASI290MM

Filter=AstrodonUV

Profile=Venus

Diameter=35.32"

Magnitude=-4.51

FocalLength=5900mm

Resolution=0.10"

Frames captured=6950

File type=SER

ROI=712x714

FPS (avg.)=57

Shutter=16.79ms

Gain=471 (78%)

Gamma=50 (off)

Histogram=83%

Limit=120 Seconds

Done