22.7.18

indi-eqmod testing




Testing a build from git using
 indi_getprop *.TELESCOPE_PIER_SIDE.*
and
north guide pulses from within phd2







1. position A : CW down, pointing South and East, approximately on celestial equator (dec 0)
EQMod Mount.TELESCOPE_PIER_SIDE.PIER_WEST=On
EQMod Mount.TELESCOPE_PIER_SIDE.PIER_EAST=Off
phd2 pulse north = dec increases


2. position B: move the dec axis north through the pole
EQMod Mount.TELESCOPE_PIER_SIDE.PIER_WEST=Off
EQMod Mount.TELESCOPE_PIER_SIDE.PIER_EAST=On
phd2 pulse north = dec decreases


3. position A1: move dec axis south back to A, move RA axis west until scope goes past meridian (counterweights slightly up)
EQMod Mount.TELESCOPE_PIER_SIDE.PIER_WEST=On
EQMod Mount.TELESCOPE_PIER_SIDE.PIER_EAST=Off
phd2 pulse north = dec increases


4. position D: meridian flip the scope so it is on the east side of pier pointing West
EQMod Mount.TELESCOPE_PIER_SIDE.PIER_WEST=Off
EQMod Mount.TELESCOPE_PIER_SIDE.PIER_EAST=On
phd2 pulse north = dec decrease


5. position C: move dec axis north through the pole to position C
EQMod Mount.TELESCOPE_PIER_SIDE.PIER_WEST=On
EQMod Mount.TELESCOPE_PIER_SIDE.PIER_EAST=Off
phd2 pulse north = dec increases


6. position D1: move dec axis south back to position D, then move RA axis east until scope goes past meridian (CW slightly up)
EQMod Mount.TELESCOPE_PIER_SIDE.PIER_WEST=Off
EQMod Mount.TELESCOPE_PIER_SIDE.PIER_EAST=On
phd2 pulse north = dec decreases


m56

Discovered by Charles Messier on 29 January 1779, this little cluster lies at a distance of 33000 light years. What else do you do when there's a gibbous moon to light the way and you're trying to work out which way to send indi-eqmod declination guide pulses? Oh, the excitement. Anyway, here we are with a reversed DEC calibration in indi and phd2 doing a great job of guiding for 30 frames.
globular cluster m56 in lyra
700d on 250p    30x150s @ ISO800

19.7.18

trifids

Two renditions this year with a comparison. Very hot and turbulent to the south...
gaseous nebula m20 the trifid in sagittarius
700d on 250p 12x300s @ ISO800
700d on nt150s 22x300s @ ISO800

amsterdam

Also 6000 light years away, from Stewart Sharpless' catalogue of 1959. Not easy to decide what is gas and what is space on this one. Spread over 2 nights with the usual ekos-PHD2 battle.; this will be the last of the Linux only snaps for a while:(
gaseous nebula sh2-101 the tulip in cygnus
700d on nt150s    51x300s @ ISO800

m17

Dangerously low to the south and not resembling much its namesake, here is this year's rendering. This time around under Linux. 6000 light years distant, a star forming region. The cluster of new stars is the youngest of all in our galaxy at just 1 million years of age.
 nebula m17 the swan in sagittarius
700d on 250p  16x240s @ ISO800

10.7.18

the first planetary nebula

Messier was the first to note this nebula in 1764; a star at the end of its life cycle giving up all it has to space. 1360 light years away and not up to the 150-f8 version, interesting comparison maybe?
planetary nebula m27 dumbbell in vulpecula
700d on 250o    16x180s @ ISO800