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Monthly archives: december, 2019

A shell script to help the mortal photographer

When working with registered and aligned images that are of different size, I use imagemagick to frame the 16 bit tiff files, with this little script:

mkdir output
for filename in *.TIF*; do
     convert "$filename" -background black -gravity center -extent $OUTPUTRES output/"$filename".out.tif

for filename in *.tif*; do
     convert "$filename" -background black -gravity center -extent $OUTPUTRES output/"$filename".out.tif

Szaturnusz 2019-10-24

HEQ5, N250/1200, TSO ADC, ASI 224MC (cooled), home observatory, mountpusher


Sun – 2019-12-22

After a longer overcast period, I managed to image the Sun in Hydrogen alpha, using my solar setup: HEQ5, Lunt LS60T Hα, B600, ASI 120MM


HD 33802

I had both some time and clear skies to image yet another colored binary.  I used the HEQ5, N250/1200, TSO ADC, ASI 224MC (cooled), home observatory, mountpusher setup well known by those who follow my posts, and the heavy processing described here. The main issue with these binary stars is that they are faint, and their companions are even more so, so even my mountpusher has a problem following the target — the mountpusher needs at least two-three frames per second to not beep and have the time to apply the needed corrections.

HD33802, HIP 24244 [* in Lep] 3Iot Lep, B8V, 232ly 4.45m  [simbad] [photo-planner]


Photoplanner: Close Neighbors

So I’ve been thinking about this: what if I want target proposals for objects that have a nearby neighbor. Like the Double Cluster, or  M81 and M82, or M35 and NGC 2158. So I came up with a generic filter in the photo planner that narrows the search results based on whether a particular result has a neighbor. The search switch is conjunction, and the unit is degrees, defaulting to 1 degree. Some searches (like an unpolite naked :conjunction) may still result in a server error (low memory), so the switch works on already specific queries.


Galaxies that have an obvious nearby friend:

type:galaxy minlum:11 conjunction:1

Open clusters and/or globular clusters that are near each other:

type:ogc :conjunction

Open or globular clusters or planetary nebulae with at least one planetary nebula in the pair. The curious cases of M46 and NGC 2818:

type:pnogc conjunction:0.7 conjunctiontype:pn minsize:0.005

The results are some pretty nice vistas.



Sol Invictus: it was here before me, it’ll be here after me, till it won’t

Lunt LS60T Ha + B600 on the HEQ5, with an ASI 120 MM USB3 2019-12-07


Jól kalibrált monitoron mindegyik számnál elkülönülő árnyalat látszik. Ha mégsem látszanak, akkor a megjelenített képek színhiányosan rajzolódnak ki. A monitort valószínűleg kalibrálni kell.

You should see distinct shades for each number. If those shades are not clearly visible, the displayed pictures will lack accuracy. Your display most likely needs to be calibrated (brightness, gamma, contrast etc.).