Celestial hemisphere:  Northern  ·  Constellation: Cassiopeia (Cas)  ·  Contains:  HD14510  ·  HD14552  ·  HD14695  ·  HD14817  ·  HD15069  ·  IC 1795  ·  LBN 645  ·  LBN 646  ·  LBN 647  ·  LBN 648  ·  LBN 650  ·  LDN 1356  ·  LDN 1359  ·  LDN 1361  ·  NGC 896
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Single 3600s Ha5nm subframe of the IC1795 Fish Head nebula, Weitang Liang
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Single 3600s Ha5nm subframe of the IC1795 Fish Head nebula

Getting plate-solving status, please wait...
Single 3600s Ha5nm subframe of the IC1795 Fish Head nebula, Weitang Liang
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Single 3600s Ha5nm subframe of the IC1795 Fish Head nebula

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Description

Last night I have perfect transparency at my remote observatory. I am curious on if I can exposure a 3600s sub that I still want perfect stars. The ASA DDM100 did great jobs in 1800s sub but never try a 3600s sub. And my Moravian CMOS supports up to 3600s, so I am trying the limit of my configuration.

Luckily, I got what I want. Both two scopes perform perfectly. I got the Main scope FWHM=1.6"@MDL, Follow scope FWHM=1.9". Here's the unprocessed raw data just do HT. Incredible!

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Single 3600s Ha5nm subframe of the IC1795 Fish Head nebula, Weitang Liang