Supernova remnant CTA 1 (SNR G119.5+10.2) and NGC 40 (Göran Nilsson)

Celestial hemisphere: Northern · Constellation: Cepheus (Cep) · Contains: NGC 40 · PK120+09.1

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Supernova remnant CTA 1 (SNR G119.5+10.2) and NGC 40

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Supernova remnant CTA 1 (SNR G119.5+10.2) and NGC 40

CTA 1 is a rarely imaged supernova remnant (aka SNR G119.5+10.2) in Cepheus, consisting of a 1.5 degree filamentary shell, so quite large. However, it is extremely faint and my first attempt to image it during a moonlit night using NBZ dual-band filter was not very successful., although the result was interesting enough to merit a second attempt when the moon was gone. So this is the second attempt.

The bright object near the center is NGC 40, a small planetary nebula. However, they are not interacting but only happen to be on the same line of sight. The distance to CTA 1 is estimated about 4600 lightyears and its age is about 10’000 years. NGC 40 is about 3500 light years away from us and 4,500 years old.
CTA 1 occur in the first list of radio sources published by the CalTech Observatory in 1960, hence the annotation CTA.

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Status	Advanced success
Started	...
Astrometry.net job	5360275
PixInsight job	6Z0K5N06N3B4DWVA4MMWZ8NI5VRGJ4Q6
PixInsight queue size	n/a
PixInsight stage	TASK_LOG

RA (center)	00h10m21s.11
RA (top/left)	23h58m35s.70
RA (top/right)	23h49m59s.26
RA (bottom/right)	00h19m39s.15
RA (bottom/left)	00h34m11s.39

Dec (center)	+72°50′29″.9
Dec (top/left)	+74°51′25″.8
Dec (top/right)	+71°20′28″.5
Dec (bottom/right)	+70°47′56″.10
Dec (bottom/left)	+74°11′32″.8

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Supernova remnant CTA 1 (SNR G119.5+10.2) and NGC 40

Supernova remnant CTA 1 (SNR G119.5+10.2) and NGC 40

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Supernova remnant CTA 1 (SNR G119.5+10.2) and NGC 40

Supernova remnant CTA 1 (SNR G119.5+10.2) and NGC 40

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