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Markarian’s Chain, M88, M91 and NGC4571, 


            Sinan Arkin
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Markarian’s Chain, M88, M91 and NGC4571

Acquisition type: Electronically-Assisted Astronomy (EAA, e.g. based on a live video feed)

Imaging telescopes or lenses: Takahashi FSQ 106 EDX4

Imaging cameras: ASI ZWO ASI1600 MM Pro Cooled

Mounts: Celestron CGX

Guiding telescopes or lenses: Takahashi FSQ 106 EDX4

Guiding cameras: ASI ZWO ASI120mm mini

Software: Photoshop CC  ·  Sequence Generator Pro  ·  Pleaides Astrophoto PixInsight  ·  Open PHD Guiding Project PHD2 Guiding

Filters: ZWO L 36mm  ·  ZWO B 36mm  ·  ZWO G 36mm  ·  ZWO R 36mm  ·  ZWO Ha 36mm

Accessory: PrimaLuceLab ECCO  ·  Celestron SkySync GPS  ·  Celestron StarSense  ·  Optec Alnitak Flip-Flat  ·  OAG  ·  ZWO Filterwheel EFW 7x 36mm  ·  PrimaLuceLab Eagle 3  ·  MoonLite NiteCrawler WR35  ·  QHYCCD Polemaster

ZWO B 36mm: 214x120" (gain: 139.00) -15C bin 1x1
ZWO G 36mm: 243x120" (gain: 139.00) -15C bin 1x1
ZWO Ha 36mm: 154x300" (gain: 139.00) -15C bin 1x1
ZWO L 36mm: 170x300" (gain: 139.00) -15C bin 1x1
ZWO R 36mm: 233x120" (gain: 139.00) -15C bin 1x1

Integration: 50.0 hours

Darks: ~50

Flats: ~50

Flat darks: ~50

Bias: ~120

Bortle Dark-Sky Scale: 6.00

Astrometry.net job: 3693279

RA center: 12h 30' 58"

DEC center: +13° 33' 3"

Pixel scale: 1.474 arcsec/pixel

Orientation: -42.523 degrees

Field radius: 1.769 degrees

Resolution: 8021x3231

Locations: Bellapais, Kyrenia, Cyprus

Data source: Backyard


Two-panel mosaic of the Markarian’s Chain, M88, M91 and NGC4571.

This project has been extremely difficult and frustrating for me. The problems started with faulty calibration frames and no way of redoing them due to the changes in the imaging train, then the tilt in the blue filter and background gradient problems due to light pollution under Bortle 6 skies which were compounded by the calibration issues. I am just happy to be able to show something “acceptable” for all the work that’s gone into it. This project has been “baptism by fire” for me and will make me think twice before attempting another broadband mosaic project from my backyard.