Hemisphere:  Northern  ·  Contains:  IC3303  ·  IC3344  ·  IC3349  ·  IC3355  ·  IC3363  ·  IC3388  ·  IC3393  ·  IC3443  ·  IC3457  ·  IC3459  ·  IC3475  ·  M 84  ·  M 86  ·  M 87  ·  M84  ·  M86  ·  M87  ·  NGC 4374  ·  NGC 4388  ·  NGC 4402  ·  NGC 4406  ·  NGC 4407  ·  NGC 4425  ·  NGC 4435  ·  NGC 4436  ·  NGC 4438  ·  NGC 4440  ·  NGC 4461  ·  NGC 4473  ·  NGC 4476  ·  And 19 more.
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Virgo Cluster core - M87 and Markarian's Chain, 


            Paul Ricker
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Virgo Cluster core - M87 and Markarian's Chain

Imaging telescopes or lenses: Apertura 60EDR

Imaging cameras: ZWO ASI183MM-Pro

Mounts: Explore Scientific iEXOS 100

Guiding telescopes or lenses: Astromania 50 mm guidescope

Guiding cameras: ToupTek ToupCam GCMOS01200KMA

Software: PhD2  ·  Photoshop CC  ·  Astro Photography Tool - APT Astro Photography Tool

Filters: ZWO new B  ·  ZWO new G  ·  ZWO new R  ·  ZWO new L

Accessory: ZWO EFW Mini  ·  Apertura Field Flattener

Dates:March 25, 2020March 29, 2020April 1, 2020April 9, 2020April 14, 2020April 15, 2020

ZWO new B: 4x300" (gain: 100.00) -5C bin 1x1
ZWO new B: 80x60" (gain: 100.00) -5C bin 1x1
ZWO new G: 5x300" (gain: 100.00) -5C bin 1x1
ZWO new G: 81x60" (gain: 100.00) -5C bin 1x1
ZWO new L: 4x300" (gain: 100.00) -5C bin 1x1
ZWO new L: 150x60" (gain: 100.00) -5C bin 1x1
ZWO new R: 5x300" (gain: 100.00) -5C bin 1x1
ZWO new R: 83x60" (gain: 100.00) -5C bin 1x1

Integration: 8.1 hours

Darks: ~56

Flats: ~50

Avg. Moon age: 12.30 days

Avg. Moon phase: 45.08%

Bortle Dark-Sky Scale: 6.00

Astrometry.net job: 3917041

RA center: 12h 28' 48"

DEC center: +12° 51' 37"

Pixel scale: 1.350 arcsec/pixel

Orientation: 11.587 degrees

Field radius: 1.186 degrees

Resolution: 5228x3555

Locations: Backyard, Champaign, IL, United States

Data source: Backyard


The center of the Virgo Cluster. In the lower left is M87, the massive brightest cluster galaxy (BCG) of the cluster. This galaxy is 2-10 times more massive than the Milky Way depending on where you put the cutoff between it and the surrounding cluster. At its center is the 6.5 billion solar mass black hole imaged last year by the Event Horizon Telescope. (Much better resolution than a 60mm telescope!) There are galaxies all over the image. In the upper right is most of Markarian's chain, including the two large ellipticals M84 and M86 and the two interacting galaxies known as Markarian's Eyes. Nearby there are a couple of edge-on spiral galaxies, NGC 4388 and NGC 4402, as well as numerous smaller galaxies. I selected and slightly blurred the stars to overcome a weird "iron cross" point spread function I seem to get with the 60 mm refractor when it is cold.



Paul Ricker
License: None (All rights reserved)

Sky plot

Sky plot


Virgo Cluster core - M87 and Markarian's Chain, 


            Paul Ricker