Trio of Galaxies

M105 and Friends

Two elliptical galaxies and one spiral galaxy very close in the sky. Not surprisingly all are considered part of the same group, even though one of them is a bit further away.

Constellation: Leo

Top: NGC 3389Right: NGC 3384Left: NGC 3379 (M105)
Type:Spiral galaxyElliptical galaxy Elliptical galaxy
Magnitude: +11.95+9.93+9.25
Distance:63 million light years31 million light years37 million light years
Diameter:49,000 light years47,000 light years52,000 light years
Apparent size:2.7 arc min 5.2 arc min 4.9 arc min

Sometimes when I take this kind of image I find unanticipated distant objects in the backgound and I enjoy tracking down their identification and distance. This shot was no exception, with two very faint (15th magnitude) galaxies marked A and B in the right hand bottom corner below:

Cropped and inverted image showing NGC 3389, NGC 3384 and NGC 3379 (M105) to the upper left.
The two objects marked A and B are more distant galaxies.
Image © Roger Powell

Galaxy A is called 2MASX J10485882+1300587 and its distance is around 500 million light years.

Galaxy B is called 2MASX J10483408+1258590 and its distance is around 480 million light years.


Image details

Exposure:116 min (32 subs @ 217.9 sec)
Field of View (feature image):68.6 x 45.7 arc-min
Feature image date:2021-03-24
Astrometry.net

Leo

Above: location of Leo in the sky.
Right: location of galaxies in Leo

Astrometry.net

nova.astrometry.net

If the Astrometry images do not appear, it is because the Astrometry website is sometimes off line.


Telescope Details

SkyWatcher Esprit 120 mm apochromatic 3-element refractor; 840 mm f/l @ f/7.
Field flattener; ZWO Duo-band Hα (656nm) and [OIII] (500nm) filter.
SkyWatcher EQ6-R Pro mount; ZWO ASI120 guide camera.
Imaging camera: ZWO ASI 071 MC Pro (CMOS 28.4mm 16 Mpx).
Software: Telescope control: Cartes du Ciel, EQMOD, PHD2, Imaging: SharpCap, Gimp.
Observatory location: 34° South.

Images © Roger Powell

I’m a founder member and webmaster of Macarthur Astronomical Society

11 Comments

  1. I especially find your images, (and now others in this “new era” of amateur astronomical photography) …awesome, and often am intrigued by those hardly noticed little fuzzy “things” hiding deep in the background, and in this case, if I’m right, about seven times more distant than the “featured” galaxies!
    Back in the sixties, (particularly in the northern hemisphere) there primarily were the “Messier” and “NGC” objects, although a few designations, like H (Hershel), were sprinkled in here and there. Your captured images impressively raise the bar (again) of how much more of the universe is accessible to so called “amateur” backyard astronomers. M 🙂

    Liked by 1 person

    1. Thanks, Marty. It’s fun identifying the distant fuzzies.

      Messier was always the list of objects which amateurs went to first – but as a list of “best” objects it fell short. It has been more recently supplemented with the Caldwell list, which adds many objects of a similar calibre deserving of our attention. Also, the Messier list was heavily biased towards the Northern Hemisphere.

      I’ve seen most of them visually and now I’m slowly working my way through both lists with a camera.

      🙃

      Liked by 1 person

    1. Thanks, Emilio. It’s a long process. No lifting, no driving, no helping, don’t do this, can’t do that……….and I’m being watched. 🙁

      Like

    2. My advice . . . milk it for all it’s worth, and soon you’ll hear “get it yourself!” and “do it yourself!”

      But, hey! Meanwhile, if interested, I have 2,910 posts (eleven years worth) you could peruse, most with lots of photos and words (some even clever words). Or, if you prefer, I recently posted links to all my fiction (many flash stories, many short stories, a few novella-length stories, and three novels). Some say it’s not awful. Or, you could check out my SmugMug account with more than 47,000 photos, some even good.

      Just saying, you know, if you’re bored . . .

      On a smaller scale, you could peruse my Project 313 stuff . . . it has a good mix of material (IMNSHO):
      https://dispersertracks.com/category/photos/projects/project-313/

      Liked by 1 person

  2. At first I thought these might be the Leo Triplet of M65, M66, and NGC 3628. Then I looked at your Leo chart. Close, but no cigar. Several nights ago I was trying to find the triplet. Conditions weren’t good enough. It will have to be another time.

    Liked by 1 person

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