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Martin Meredith

Observing WBL groups in Pegasus

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Continuing the hunt for interesting WBL groups, here are some from last night in Pegasus (which contains no fewer than 44 such groups). All are live stacks of 15s subs, no darks/flats.

WBL 726. The lower left pair is the interacting pair VV2003 (NGC 7771 + NGC 7770), while the face on Sb is NGC 7769. Four fainter galaxies bisect these brighter members in a wavy N-S line. 





WBL 724. This is the central part of galaxy cluster Abell 2666. Main galaxy is NGC 7768, a mag 13.3 elliptical. Field full of delicious edge-ons. Exposure time is actually 10 x 15s = 2m30 (sub exposure length is estimated based on time of arrival differences in Jocular and it sometimes overestimated...).




WBL 723. Understated group of 5 or more minor galaxies. Lovely member of the Flat Galaxy Catalogue (FGC 2527). The central (though strangely not  the brightest) galaxy is NGC 7740, a mag 15.6 E-S0. Both galaxies at the extremes of the group are brighter, oddly missed in the NGC compilation/observation process.







WBL 688. A group of 6 NGC galaxies, the brightest of which is NGC 7385, a mag 13.2 elliptical. Distance estimates range from 340-400 MLyrs for group members. Total exposure is 17 x 15s = 4m15.



WBL 692. Main group is VV 84 and consists of NGC 7433, 7435, 7736, plus other gxs, interacting at around 350 MLyrs. This is the equal of many Hickson groups and why it didn't make that list I don't know.



WBL 685. Tonight's star of the show for me, just the kind of jewel that WBLs sometimes throw up, with the benefit of a field rich in stars. The upper edge on is NGC 7345 and to its right is mag 15.2 type SBa NGC 7342. The group at the base have mags 14.7-15.6. One of the upper edge ones (the one to the right) appears to have a slight curve to it, or perhaps another gx. There are a bunch of fainter and/or more compact galaxies in this field too, unusually for such a star-rich area.










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Great report Martin, those clusters are coming out so well with that setup - I love WBL 692 and 685 - outstanding. I really like the eyepiece view btw, makes it seems more real somehow, hard to explain.

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Thanks Rob. I've adjusted the mount and it seems to have helped to get more useable subs too. I should have added to my report that these were taken with a 60% moon in the same quadrant, so the automatic gradient removal really seems to have helped here. Yes, I favour the eyepiece view not just because it is actually what I am seeing/manipulating on the screen, but because it allows the appropriate level of zoom (and all are rotated with N up which helps me identify objects). Some of these objects occupy quite a small region of what is already a small sensor. 


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