NarrowBand - Lack of OIII and SII data

[pfile]

i did some 30-min ha subs on m57 the other night but it's up too late (house blocks almost to the zenith towards the east). given the color of the outer halo i suspect there's really only Ha there. i might try some oiii just for the heck of it.

i have been concentrating on the cat's eye nebula and am up to 14h of 30m Ha subs. the outer structure is very faint.

[jerryyyyy]

i did some 30-min ha subs on m57 the other night but it's up too late (house blocks almost to the zenith towards the east). given the color of the outer halo i suspect there's really only Ha there. i might try some oiii just for the heck of it.

i have been concentrating on the cat's eye nebula and am up to 14h of 30m Ha subs. the outer structure is very faint.

I think we are following the same road given the limited visibility here.  I am imaging the Cat's Eye too... then M57.  I just got one 1800s H-alpha las night and a little lrgb.  I can barely see the outer structure of the nebula in one sub.  Are you just collecting the H-alpha?  Would I be better with 60min?  The center looks pretty saturated.

Since I can only get at most 2h imaging per slice of sky between 45 DEG E elevation and the meridian, I am trying to get images in this sequence:  Cat's Eye; M57; M20; M27. 

[pfile]

the center is completely saturated and unfortunately due to the spider vanes holding the secondary on the AT10RC, i've got a diffraction pattern coming off of the core of the nebula. for now i've only done Ha since i was not sure if there was any oiii or sii.

but according to this: http://www.spacetelescope.org/images/heic0414b/ there is oiii and sii in the outer shell but i'd expect it to be very faint per the discussion above.

i need to redo my calibration, but this is a first pass - it's actually 30x1800s, or 15h.

[jerryyyyy]

the center is completely saturated and unfortunately due to the spider vanes holding the secondary on the AT10RC, i've got a diffraction pattern coming off of the core of the nebula. for now i've only done Ha since i was not sure if there was any oiii or sii.

but according to this: http://www.spacetelescope.org/images/heic0414b/ there is oiii and sii in the outer shell but i'd expect it to be very faint per the discussion above.

i need to redo my calibration, but this is a first pass - it's actually 30x1800s, or 15h.

Reassuring insofar that my one image has some of this material... very difficult for me to calibrate one image in PI and see it right.  Works very well with the batch processing. 

Yes looks like the O-III is a very small amount near the core.