Galaxy doublet NGC4085 and NGC4088 (Arp 18) in Ursa Major (Jean-Pierre Lees)

Celestial hemisphere: Northern · Constellation: Ursa Major (UMa) · Contains: NGC 4085 · NGC 4088

Galaxy doublet NGC4085 and NGC4088 (Arp 18) in Ursa Major, Jean-Pierre Lees

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Galaxy doublet NGC4085 and NGC4088 (Arp 18) in Ursa Major

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Galaxy doublet NGC4085 and NGC4088 (Arp 18) in Ursa Major

This doublet has also been catalogued as Arp 18 and is member of Ursa Major Cluster. Both galaxies are highly inclined spiral galaxies, with a diameter of 30000ly (NGC4085) and 65000 ly (NGC 4088). Distance: 36 Mly (NGC4085) and 37 Mly (NGC4088). The core to core separation is 12', which would be about 130000 ly if the distance is 37mly. NGC4088 has a brighter elongated core and a dusty bar. Its arms are bright, massive and tightly wound, with many knots and condesations, and a tremendous amount of dust. These two galaxies were discovered one year apart by Herschel, NGC4088 on 9 March 1788 and NGC4085 on 12 April 1789. (Source: the complete guide of the Herschel objecs, Mark Bratton, Cambridge University press).

Le doublet de galaxies NGC4088 (au centre) et NGC4085 (la petite à droite) dans la Grande Ourse. Elles sont distantes de 37 millions d'années lumière. Set up habituel avec C8 et réducteur de focale, 20 poses de 5' en luminance et 20 poses de 1', binning 2x2, en R, V et B. Villaz, 29 mars 2017.

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Galaxy doublet NGC4085 and NGC4088 (Arp 18) in Ursa Major

Galaxy doublet NGC4085 and NGC4088 (Arp 18) in Ursa Major

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Galaxy doublet NGC4085 and NGC4088 (Arp 18) in Ursa Major

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