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Observation by Alan Snook: Arp 214 & Arp 322

Uploaded by

Alan Snook

Observer

Alan Snook

Observed

2017 Mar 20 - 22:30

Uploaded

2017 Apr 13 - 14:40

Objects

NGC3718
Arp 322

Equipment
  • 0.5m f4.1 Dobsonian
  • 8mm Ethos eyepiece x260
  • Lumicon deep sky filter
Location

Kent

Target name

Arp 214 & Arp 322

Title

Arp 214 & Arp 322

About this image

A correspondent in the 2017 April Journal, page 116, refers to how on rare occasions the seeing is exceptional. “Joyous. Anything seems possible on such a night” he writes. Such was March 20 although I didn’t fully appreciate it at the time. The night had not started well. The BBC were beaming images onto the White Cliffs using “three lighthouse-worth’s of power” to mark Vera Lynn’s 100th.  The light-spill was dire, but as the hour drew late they switched off and went home. Perhaps the tide was coming in.

A cold front had recently cleared through to the east. I turned the telescope to the pairing of Arps 214 & 322 in UMa.   I chose it because last year a friend had sent me his CCD image and I wanted to reciprocate with a drawing. The field was overhead, 10 degrees from the zenith.  Both Arps were seen easily with direct vision. In Arp 322 three components of the galaxy chain were seen without difficulty, namely Hickson 56B, 56C and 56D.  Components A and E were invisible.

Only when writing up the observation the following day did I appreciate that the three components in the galaxy chain are magnitudes 14.7, 15.8 and 16.8. My previous faint record was on Arp 331, spotting a galaxy of 15.7m and failing to see one 16.6m.

Arp 214 has an irregular outline. There is lots of vague structure, arms or plumes etc, seen mostly with AV. This is all very low contrast and difficult to pin down. There is no brightening toward the centre and no core. There are suggestions of dark structure but again difficult to pin down.

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Comments
Jeremy Shears
Jeremy Shears, 2017 Apr 13 - 15:30 UTC

This is a really nice observation, Alan. I especially enjoyed reading your write-up about the circumstances surrounding it.

Kind regards,

Jeremy

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