Observation by Peter Hannah: NGC3718

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Peter Hannah


Peter Hannah


2024 May 09 - 00:00


2024 May 26 - 18:02


Arp 322

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Ursa Major

Field centre

RA: 11h32m
Dec: +53°04'
Position angle: +48°04'

Field size

0°33' × 0°29'

  • Planewave CDK 14
  • 10Micron GM2000 mount
  • FLI Proline P9000 CCD camera
  • Astrodon LRGB filters

Lum 9.5hrs, Red 11hrs, Green 12hrs, Blue 11hrs


IC Astronomy, Oria, Spain

Target name

NGC3718 plus NGC3729 and Hickson 56



About this image

NGC3718 (centre) is a spiral galaxy with a distinctive twist, found in Ursa Major just south of the Plough. Also designated Arp 214, the mag 10.7 galaxy is 9.2 x 4.4 arcminutes in size. The Arp Atlas of Peculiar Galaxies notes it to be a Seyfert galaxy, meaning it has a very bright core.

The second-largest galaxy in the image is NGC3729, also a spiral. Both are classed as barred spirals, though the Arp atlas notes that the bar in 3718 is a dust lane rather than being stellar in nature. The two galaxies lie at a similar distance - about 40 million light years - and are probably interacting, which may have caused the distortion in NGC 3718.

To the south (lower left) of NGC3718 is Hickson 56 (Arp 322), a group of 5 galaxies of 15th and 16th magnitude, considerably further away at around 400 million light years.

North is to the upper right in this image.


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