swap_horiz Ou4 Alternatives
Looking for alternatives to Ou4? Compare the top Nebula options ranked by our AI scoring system.
Ou4
Ou4 represents a significant bipolar emission nebula situated within the Sh2-129 star formation region of the Cepheus constellation. This outflow, first observed in 2011 by amateur astronomer Nicolas Outters, is notable for its distinct twin jets extending outwards from a central source. Astronomers...
apps Top Ou4 Alternatives
The top alternative to Ou4 in 2026 is Elephant's Trunk Nebula with a score of 9.04/10, followed by Homunculus Nebula (8.86) and Sharpless 2-106 (8.86).
Elephant's Trunk Nebula
The Elephant’s Trunk Nebula, formally IC 1396A, is a dark emission nebula located in the Cepheus constellation approxima...
Homunculus Nebula
The Homunculus Nebula is a stunning bipolar emission nebula associated with the supernova remnant of Eta Carinae. This c...
Sharpless 2-106
Sharpless 2-106 is a bipolar emission nebula located within the Cygnus constellation. It’s notable for its distinct twin...
Sharpless 2-106 (Sh2-106)
Sharpless 2-106 is a bipolar emission nebula located approximately 2,000 light-years from Earth in the constellation Cyg...
NGC 7822
NGC 7822 is a vibrant emission nebula located within the Cepheus constellation. It’s notable for its active star formati...
Squid Nebula
The Squid Nebula, formally designated OU4, is a faint emission nebula located within the Cepheus OB Association. It’s re...
Dragon's Egg Nebula (NGC 6164)
The Dragon's Egg Nebula, comprising NGC 6164 and NGC 6165, is a bipolar emission nebula in the constellation Norma. Its...
NGC 6164/6165
NGC 6164 and NGC 6165 form a bipolar emission nebula located in the southern constellation of Norma. The nebula's hourgl...
NGC 6164
NGC 6164 is a bipolar emission nebula located in the southern constellation of Norma. The cosmic structure was expelled...
Wizard Nebula
The Wizard Nebula, formally designated SH2-142, is an emission nebula notable for its intricate structure resembling a w...
Sh2-129
Sh2-129, also known as the Flying Bat Nebula, is a significant emission nebula located within the Cepheus OB2 associatio...
Flying Bat Nebula
The Flying Bat Nebula, also known as SH2-129, is a diffuse emission nebula located in the Cepheus constellation. It’s re...
IC 1396
IC 1396 is a large emission nebula and H II region in the constellation Cepheus, located approximately 2,400 light-years...
Dragon's Egg Nebula (NGC 6164-5)
The Dragon's Egg Nebula, designated NGC 6164-5, is a bipolar emission nebula located in the southern constellation of No...
Cave Nebula
The Cave Nebula, officially Sh2-155, is a diffuse emission nebula located within the Cepheus OB3 star cluster. It’s nota...
Sh2-155
Sh2-155, also known as the Cave Nebula, is a dark emission nebula located within the Cepheus B cloud approximately 2,400...
Lion Nebula
The Lion Nebula, catalogued as Sharpless 2-132, is a large emission nebula and H II region in the constellation Cepheus....
Sh2-132
Sh2-132, commonly known as the Lion Nebula, is a large emission and diffuse nebula located in the constellation Cepheus....
Sh2-171
Sh2-171, also catalogued as NGC 7822, is a vast emission nebula and star-forming complex located in the constellation Ce...
Sh2-136
Sh2-136, commonly known as the Ghost Nebula, is a reflection nebula and Bok globule located in the constellation Cepheus...
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