Saturday, April 18, 2020

returned to ACO 1656 (Halifax)

Asked BGO to try ACO 1656 again (centred on star GSC 01995 02059). Last attempt, 7 Apr '20.

cluster of galaxies ACO 1656 in luminance

Luminance only, 13 seconds subexposures, 10 stacked shots. FITS Liberator, GIMP. North is up; east is left.

Log method used for stretch. No moonlight. Also, I used the SOM option, side of meridian, to force the capture when to the west. Hopefully a bit less light pollution then. A far better result.

OK. Let's ID things... This is gonna take a while.

Thanks to SkyTools 3 Pro, I was able to identify most of the fuzzies in the image. You'll want to embiggen to read the annotations.

ACO 1656 region with annotations (corrected)

Corrected...

Wow. 125 objects!

First, the galaxies...
  • IC 3960A aka MCG 5-31-56, PGC 44552. Small, dim, round fuzzy.
  • IC 3963 aka MCG 5-31-61, PGC 44567. Round, small, smooth.
  • IC 3973 aka PGC 44612. Fairly bright while small. Irregular.
  • IC 3976 aka PGC 44603. Elliptical, small, somewhat bright.
  • IC 3998 aka PGC 44664. Elliptical or canted spiral. Medium bright core.
  • IC 4011 aka PGC 44705. Round elliptical, medium bright, small.
  • IC 4012 aka PGC 44714. Somewhat bright core, oval ball.
  • IC 4021 aka MCG 5-31-80, PGC 44726. Round, small, somewhat bright core.
  • IC 4026 aka PGC 44749. Small, medium bright oval patch. Or a spiral?
  • IC 4040 aka MCG 5-31-85, PGC 44789. Diffuse patch. Maybe an irregular galaxy.
  • IC 4041 aka MCG 5-31-86, PGC 44802. Small, soft elliptical. Not round.
  • IC 4042 aka PGC 44808. Small but bright elliptical.
  • IC 4045 aka MCG 5-31-88, PGC 44818. Possibly an elliptical. Bright, oval.
  • IC 4051 aka MCG 5-31-90, UGC 8129, PGC 44832. Round, medium size, bright core. Elliptical.
  • LEDA 83734. Very small, dim, round.
  • LEDA 83740. Small, dim. Odd shape.
  • LEDA 83745. Almond shape, small, dim.
  • LEDA 83750. Oblong small dim fuzzy.
  • LEDA 83751. Small round elliptical, south-west of NGC 4911.
  • LEDA 93697. Horizontal smudge, very faint, small.
  • LEDA 126752. Very small dim round lint ball.
  • LEDA 126754. Tiny blotch. Irregular.
  • LEDA 126756. Barely detectable. Very smudge, small.
  • LEDA 126758. Barely visible, nearly rounded smudge.
  • LEDA 126759. Very small, round.
  • LEDA 126760. Very dim small extended patch.
  • LEDA 126761. Barely visible. Small smudge.
  • LEDA 126762. Extremely faint, small. Barely detectable.
  • LEDA 126763. Wouldn't know it was there. Extremely faint.
  • LEDA 126764. Barely visible, small smudge.
  • LEDA 126765. Very dim, very small, round fuzzy.
  • LEDA 126767. Medium sized but very dim blob.
  • LEDA 126768. Barely detectable. Very small, very faint. Round.
  • LEDA 126771. Barely visible, extremely faint smudge.
  • LEDA 126775. Irregular. Barely visible. Small.
  • LEDA 126777. Barely visible. Small smudge.
  • LEDA 126778. Irregular. Barely visible. Small.
  • LEDA 126779. Stretched smudge. Barely visible.
  • LEDA 126780. Barely visible. Very faint smudge.
  • LEDA 126781. Very small. Barely visible.
  • LEDA 126784. Barely detectable. Small.
  • LEDA 126787. Barely detectable. Strange shape.
  • LEDA 126789. Very faint, diffuse, small.
  • LEDA 126790. Wow. Medium small, very dim.
  • LEDA 126791. Stretched. Very dim. Rather small.
  • LEDA 126792. Barely visible. Very faint small smudge.
  • LEDA 126794. Very faint, very small, nearly round.
  • LEDA 126799. Very small, very faint.
  • LEDA 126800. Small, very faint, diffuse.
  • LEDA 1819490. Barely visible. Small elongated smudge.
  • LEDA 1820864. Barely visible. Medium size elongated patch.
  • LEDA 1820946. Barely visible. Medium size patch.
  • LEDA 1821341. Barely visible, extremely small faint smudge.
  • LEDA 1821892. Very diffuse, small, very faint.
  • LEDA 1822111. Quite diffuse, small, very faint.
  • LEDA 1822502. Faint small blotch. One of two?
  • LEDA 1822726. Very faint. Slightly larger. Irregular.
  • LEDA 1822852. Very faint. Slightly small. Diffuse.
  • LEDA 1826064. Very small, very dim.
  • MCG 5-31-63 aka PGC 44560. Oval. Somewhat dim.
  • Markarian 60 aka PGC 44716. Small nearly-round elliptical, medium bright core.
  • NGC 4864 aka MCG 5-31-58, PGC 44566. Small, round, medium bright. A twin?
  • NGC 4865 aka MCG 5-31-64, UGC 8100, PGC 44578. Canted spiral or elliptical? I can't tell. Small, bright core. Thin oval. 
  • NGC 4867 aka MCG 5-31-62, PGC 44568. Round, small, medium bright.
  • NGC 4869 aka MCG 5-31-65, PGC 44587. Nearly round with a bright large core.
  • NGC 4871 aka MCG 5-31-66, PGC 44606. Elliptical? Spiral? Very hard to tell. Small core.
  • NGC 4872 aka MCG 5-31-68, PGC 44624. Nearly round. Compact. Bright.
  • NGC 4873 aka MCG 5-31-69, PGC 44621. Small, smooth, round.
  • NGC 4874 aka MCG 5-31-70, UGC 8103, PGC 44628. Large elliptical. Large bright core. Round.
  • NGC 4875 aka PGC 44640. Slightly smaller than 6. Slightly different angle.
  • NGC 4876 aka MCG 5-31-73, PGC 44658. Elliptical. Medium size. Smooth core.
  • NGC 4882 aka MCG 5-31-76, PGC 44698. Round elliptical, medium bright core.
  • NGC 4883 aka PGC 44682. Large smooth core, diffuse outer edges, medium size.
  • NGC 4884 aka MCG 5-31-77, UGC 8110, PGC 44715. Large elliptical, bright core.
  • NGC 4894 aka PGC 44732. Small dim edge on with a medium bright core.
  • NGC 4898 aka MCG 5-31-82, PGC 44736. Assuming it is the brighter of the two round fuzzy balls.
  • NGC 4906 aka PGC 44799. Small round but bright elliptical.
  • NGC 4908 aka MCG 5-31-92, PGC 44828. An elliptical. Bright core.
  • NGC 4911 aka MCG 5-31-93, UGC 8128, PGC 44840. Medium large face on spiral, medium bright core.
  • PGC 44574. Small, nearly round, fuzz ball.
  • PGC 44576. Very faint, very smail.
  • PGC 44581. Faint oval.
  • PGC 44585. Small, round, medium bright.
  • PGC 44594. Small almond shape.
  • PGC 44595. Very small, dim. Not round.
  • PGC 44597. Slightly dimmer than 8. Nearly round, small. South.
  • PGC 44598. Slightly brighter than 7. Nearly round, small. North.
  • PGC 44602. Round, dim. Possible extended north and south?
  • PGC 44608. Small, round, dim.
  • PGC 44609. Irregular, small, dim.
  • PGC 44616. Elongated patch, something bright core.
  • PGC 44635. Barely visible, small, diffuse, dim.
  • PGC 44636. Small, dim. Somewhat irregular.
  • PGC 44637. Barely detectable. Small.
  • PGC 44644. Small, round.
  • PGC 44649. Small, round, somewhat bright.
  • PGC 44651. Small, round, faint.
  • PGC 44652. Small, elongated, faint.
  • PGC 44653. Tiny. Barely detectable.
  • PGC 44654. Not quite round, small, dim.
  • PGC 44656. Small, round.
  • PGC 44662. Oval shape, medium bright.
  • PGC 44666. Stretched, dim, small.
  • PGC 44675. Medium size. Maybe a canted spiral? Double core?!
  • PGC 44676. Very faint, diffuse.
  • PGC 44679. Diffuse, round, medium size, somewhat bright core.
  • PGC 44692. Barely visible, extremely small faint smudge. Dimmer than 3.
  • PGC 44693. Barely visible, extremely small faint smudge. Slightly brighter than 2.
  • PGC 44699. Edge on. Oriented north-south. Bright core.
  • PGC 44704. Canted galaxy. Possibly a spiral. Bright compact core.
  • PGC 44707. Medium large, edge on spiral?
  • PGC 44708. Small canted spiral, soft core, immediately west of NGC 4884.
  • PGC 44709. Small, dim, round. Very close to Markarian 60.
  • PGC 44723. Small, oval, diffuse cotton ball.
  • PGC 44740. Small nearly round glowing ball.
  • PGC 44741. Small medium bright smudge. Not round.
  • PGC 44763. Small round elliptical.
  • PGC 44771. Medium size. Dim. Cannot discern the type.
  • PGC 44773. Small dim round elliptical with a medium bright core.
  • PGC 44784. Canted spiral, medium size, medium bright core.
  • PGC 44792. Small kidney bean.
  • PGC 44809. Small batch, irregular.
  • PGC 44815. Canted spiral, small, smooth.
  • PGC 44821. Very small, dim elliptical. Not round.
  • PGC 44835. Very non-uniform batch.
Found a quasar too.
  • PB 3185 aka Q1256+0281. Magnitude 18.20 V. Redshift (z): 0.38. Light Time: 3.8 Gyr. Barely visible. West of PGC 44585.
Unidentified:
  • Small round elliptical north-east of, very near to, NGC 4898. A "GinCl" or galaxy in cluster. ACO 1656 120.
  • Elongated oval south-east of PCG 44740. Aladin shows two objects here: GMP 2787 and [CTM2010] 32265.
  • West of LEDA 126777. GMP 3154.
  • East of bright star, medium size elongated smudge, right along diffraction spike. Possibly GMP 3202.
  • Two objects north-west of bright star? Just stars it seems.
  • Smudge north-west of PCG 44576. Equal to the LEDAs to the south. Might be [EDG2007] 167.
  • Twin to NGC 4864. May be [EDG2007] 34.
  • Small irregular smudge south-east of IC 3973. No designation proper; 2MASX J12593524+2751488.
Used Aladin 10 Desktop to identify the last few.

§

Hmmm. There are another 20 objects visible in April 7 shot, including the amazing needle galaxy IC 3949, as the mount aimed further to the west for some reason.
  • IC 3947 aka PGC 44515
  • IC 3949 aka MCG 5-31-52, UGC 8096, PGC 44524
  • IC 3955 aka PGC 44544
  • IC 3957 aka MCG 5-31-60, PGC 44554
  • IC 3959 aka MCG 5-31-59, PGC 44553
  • IC 3960 aka MCG 5-31-55, PGC 44551
  • LEDA 83727
  • LEDA 93696
  • LEDA 126801
  • LEDA 126809
  • LEDA 126811
  • LEDA 1817584
  • NGC 4858 aka MCG 5-31-51, PGC 44535
  • NGC 4860 aka MCG 5-31-54, PGC 44539
  • PGC 44518
  • PGC 44519
  • PGC 44522
  • PGC 44533
  • PGC 44546
  • PGC 44547
OK.

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