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Astrophotography from Ursa Major Observatory @ ROSA

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deeplook.at
“Alkor” Lacerta N25010c Newtonian, f/D = 4 SX Trius 694, Baader LRGB filter
10micron GM2000 HPS II, unguided
Ha+[NII] 115x10min / [OIII] 63x10min / L 36x10min / RGB 31x10min per filter
51 h 10 min
data acquired remotely using CCD Commander
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Sh2- 174 in Cepheus
Emission nebula
~ 20’
Cepheus
2018-07-30+31 + 2018-08-01+02+07+11+12+14+17+18+24+26+27 + 09-01+02+03+04
~ 900 ly
The object is probably not a PN. Rather it is the case that the white dwarf GD 561 is crossing a gas cloud and ionizes the surrounding gas.