Comet 46P Wirtanen - close approach to Messier 45 on the 16th December 2018
Samyang 135 f/2 at f/2.8
Astro-modified Canon 80D at ISO400, IDAS clip-in LPS D2 filter, 7 x 3 minute subs.
NEQ6 pro mount with Rowan belt drives -1 star align.
Mini-PC with WiFi
Mount WiFi control with ASCOM/AstroPhotography Tool
Camera WiFi control with Backyard EOS
22 dark frames
45 flat frames (electroluminescent panel @ 1/200s)
Master bias from library.
Post processed in PixInsight 1.8 and Photoshop
Local parameters:
Temp: 5.4- 5.7c
Humidity: 81- 84%
Pressure: 1000.4 kPa
Camera Sensor Temp: 12-13c
Light Pollution and Weather:
First quarter Moon.
Initially cloudy and hazy, gradually cleared. Significant moonlight gradient.
Polar Alignment:
QHY Polemaster alignment -
Error measured by PHD2= 1.4 arc minute.
RA drift + 2.24 arcsec/min
Dec drift - 0.37 arcsec/min
Guiding:
PHD2 guiding with ZWO ASI290mm/Altair Starwave 206/50mm guider.
RA RMS error 0.84 arcsec, peak error -2.76 arcsec
Dec RMS error 0.44 arcsec, peak error -2.19 arcsec
Astrometry:
Center (RA): 03h 55m 12.061s
Center (Dec): +24° 11' 56.918"
Size: 5.4 x 3.56 deg
Pixel scale: 9.71 arcsec/pixel
Not happy with eccentric haloes around brighter stars - present here with 135mm lens and also 480mm scope so I'm reasonably sure it's the culprit now. I have a 2 inch screw-in filter that I can place in front of my focal flattener on the 480mm scope - will see if that fixes problem.
Update 10/2019 - other people have mentioned problems like this with the Samyang 135mm f/2 - have changed to Sigma 135mm f/1.8 because of this - much happier. If nothing else can tightly adjust focus in BackyardEOS.
Comet 46P Wirtanen - close approach to Messier 45 on the 16th December 2018
Samyang 135 f/2 at f/2.8
Astro-modified Canon 80D at ISO400, IDAS clip-in LPS D2 filter, 7 x 3 minute subs.
NEQ6 pro mount with Rowan belt drives -1 star align.
Mini-PC with WiFi
Mount WiFi control with ASCOM/AstroPhotography Tool
Camera WiFi control with Backyard EOS
22 dark frames
45 flat frames (electroluminescent panel @ 1/200s)
Master bias from library.
Post processed in PixInsight 1.8 and Photoshop
Local parameters:
Temp: 5.4- 5.7c
Humidity: 81- 84%
Pressure: 1000.4 kPa
Camera Sensor Temp: 12-13c
Light Pollution and Weather:
First quarter Moon.
Initially cloudy and hazy, gradually cleared. Significant moonlight gradient.
Polar Alignment:
QHY Polemaster alignment -
Error measured by PHD2= 1.4 arc minute.
RA drift + 2.24 arcsec/min
Dec drift - 0.37 arcsec/min
Guiding:
PHD2 guiding with ZWO ASI290mm/Altair Starwave 206/50mm guider.
RA RMS error 0.84 arcsec, peak error -2.76 arcsec
Dec RMS error 0.44 arcsec, peak error -2.19 arcsec
Astrometry:
Center (RA): 03h 55m 12.061s
Center (Dec): +24° 11' 56.918"
Size: 5.4 x 3.56 deg
Pixel scale: 9.71 arcsec/pixel
Not happy with eccentric haloes around brighter stars - present here with 135mm lens and also 480mm scope so I'm reasonably sure it's the culprit now. I have a 2 inch screw-in filter that I can place in front of my focal flattener on the 480mm scope - will see if that fixes problem.
Update 10/2019 - other people have mentioned problems like this with the Samyang 135mm f/2 - have changed to Sigma 135mm f/1.8 because of this - much happier. If nothing else can tightly adjust focus in BackyardEOS.