LBN 552 (Mike Hamende)

LBN 552

This is the result of 1.5 nights of exposure since the first night got cut short. We had a night of clouds so I brought the RASA in to design and print a new cable router. I had been using the typical semicircular router which I felt may have lead to an uneven diffraction pattern around bright stars. The new cable router has 4 identical radial troughs much like the spider of a newtonian. I'm much happier with the stars now. I had seen some reports that the gasket under the corrector plate retaining ring may cause some issue with diffraction patterns so I incorporated an aperture mask down to 198mm to eliminate that possibility. One additional feature is an 8 watt dew heater I made with some nichrome wire.

I made a new dark library for the ASI533MC at gain 0 and offset 20. I again tried 30 second exposures and had much better control over star saturation. Many of them still saturated but overall star color is much better. I could probably still benefit from 15 second exposures but I just don't want to deal with storing and processing 2000+ subs every clear night.

Final
Original
B
C

B

Title: Aperture Mask, Cable Router, Dew Heater

Uploaded: ...

C

Title: Cable Router

Description: On the left and right exterior of the ring are cutouts to engage the two pins on the interior of the aperture tube ring of the RASA. You insert the ring and turn it clockwise about 5 degrees and should stay in place (this is true for my RASA but maybe not for everyone). The two wide cutouts on the top exterior of the ring are for the crimps I use to attach the nichrome wire to the copper cable for supplying power. My dew heater is a single length of nichrome wire that is taped on exterior ring with kapton then covered with aluminum duct tape to help distribute heat. I then use cloth wire loom tape to shim the outside diameter to make it a snug fit in the front tube ring. The 4 troughs on the front are 7mm wide in total with 2mm walls on either side leaving a 3mm channel for cables, they are 15mm tall with a channel depth of 12mm. And finally the front aperture is 198mm to eliminate the possibility of the corrector plate retaining ring gasket from affecting star shape. The ring was designed to be printed without support in case some people are wondering why the back is sloped to clear the retaining ring screws rather then stepped.

Uploaded: ...

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Status	Advanced success
Started	...
Astrometry.net job	5909069
PixInsight job	9A9QHCIXIO0T4CHUOXGWVXMLLFV7AYXC
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	20h55m06s.49
RA (top/left)	21h11m31s.45
RA (top/right)	21h09m27s.43
RA (bottom/right)	20h40m41s.44
RA (bottom/left)	20h38m44s.83

Dec (center)	+78°27′23″.4
Dec (top/left)	+79°11′42″.0
Dec (top/right)	+77°39′50″.4
Dec (bottom/right)	+77°40′00″.4
Dec (bottom/left)	+79°11′53″.8

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LBN 552

LBN 552

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Image Index:

Contribution Index (beta):

LBN 552

LBN 552

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C

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