guide error seems disappear...

Guiding is getting better.. the stars are not egg shaped any more.. 

m92

part of the picture - 1000% size
stars are round

guide error compared to the error which i had half a year ago

m13

asi120mm first pictures

first pictures with the new asi120mm camera...

m16

m57

moon

saturn

m27 again..

just added 4 more 6-7 minutes exp. to the existing pictures...

fine-tune guiding

It seems that bad quality of the raspberry pi camera caused a lot of problem. the image quality is really poor, so the stars position which was calculated based on the image was really inaccurate. After applying some filters the result is much better.

The first image is the picture of a star from the camera.. The second is the same picture after median filter. The third image is after applying sharpening. The last one is after removing dark gray pixels.

After all these finding the center of the star is much more accurate.

The orange line shows the star position before these fixes were implemented. The blue line shows the star position after the fix. It seems that the line is more smooth than before. After applying 3 step moving average (red line) is smooth enough for guiding.

M27, 6x150 sec exp, ISO800, 150/750 newton

Alcor and Mizar

M51 one more time ...

10x300s
Equinox 80
Canon 60D

Plan

M20-M21	Laguna	S	Equinox	OK!!
M8		S	Equinox	ok!!!
M16	Eagle-nebula	S	750	ok!!!!!!!!!!!!!
M17	Omega-nebula	S	750	ok
scorpio	Milky-way	S	38mm	ok
graff’s cluster		S	Equinix	ok !
M24		S	Equinox	teszt!!!!!!!!!!!
	heart nebula	N	Equinox	try
	soul nebula	N	Equinox	try
NGC884	double cluster	N	Equinox	OK!!
M51	double galaxy	W	??	ok!!!!!!!!!!!!!	10x300s
M33	galaxy	E		maybe / hard
M34		E		maybe / hard
M31	Andromeda	E	Equinox	ok!!!!!!!!!!!!!
M27	Dumbell N.	E		ok!!!!!!!!!!!!!
M52		E		try / hard
	Veil Nebula	E	10d 90,mm	try

M51, again...

guiding is getting better...

goto

Currently working on the GOTO functionality, Messier and part of HIP catalog is imported and offset between any two objects can be calculated.

Venus and Jupiter

Telescope: 80/500 SkyWatcher EQUINOX ED-APO
Camera: Canon EOS 60D
created from 5-6 photos with different expositions

M51, (NGC5198)

M81, M82

Stacked from 7 photos with 2-3 minutes exp. time, using UHC filter. Very bad seeing and very light polluted area, but the guiding is getting better.

Telescope: 80/500 SkyWatcher EQUINOX ED-APO
Guiding scope: 9x50 finder scope

Guiding error 4

I've just checked if there is any delay between sending the message to change the motor speed and the actual change. The delay is about 5 frames, which is around 0.3 second.

Grey bars shows the message to the motor, blue line shows the star position.

This explains why i had that sinus like movement of the star. I started the compensation too late, and also stopped it too late.

To solve this, it's not enough to check the star's position, but also need to check the movement of the star. If it's moving to the proper direction, the compensation should be smaller, if not, the compensation should be even bigger.

The blue line shows the star's position, the red line shows the position and also added the gradient of the movement. If the value of the position is increasing (like around 50 on the chart above), the red line is much higher, so we need more compensation. If the blue line is decreasing, the red line is lower, we need less compensation. 

The guiding is much smoother like this, but in same cases the maximum compensation is not enough, so that parameter should be increased, and the compensation should be more aggressive.