Hemisphere:  Northern  ·  Contains:  Sh2-174
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Sh2-174, "Valentine Rose" Nebula, HO Bicolor, 21 & 24 Aug 2019, 


            David Dearden
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Sh2-174, "Valentine Rose" Nebula, HO Bicolor, 21 & 24 Aug 2019

Imaging telescopes or lenses: Astro-Tech AT8IN

Imaging cameras: ZWO ASI1600MM-Cool

Mounts: Skywatcher NEQ-6 Pro Synscan

Guiding telescopes or lenses: Astro-Tech AT8IN

Guiding cameras: ZWO AS120MM-Mini

Focal reducers: High Point Scientific Coma Corrector Photo & Visual For Netwonian Telescopes 2"

Software: DeepSkyStacker  ·  Silicon Fields StarTools 1.3  ·  AstroPlanner  ·  PHD2 Guiding  ·  Sequence Generator Pro  ·  EQASCOM  ·  photoshop  ·  Enterprise Astronomy Annie's Astro Actions

Filters: ZWO OIII 31 mm 7 nm  ·  ZWO H-alpha 7nm

Accessory: Orion Thin Off Axis Guider (TOAG)  ·  Robert Brown's Arduino ASCOM Focuser Pro DIY  ·  ZWO EFW filter wheel

Dates:Aug. 21, 2019Aug. 24, 2019

ZWO H-alpha 7nm: 31x300" (gain: 139.00) -20C bin 1x1
ZWO H-alpha 7nm: 11x600" (gain: 139.00) -20C bin 1x1
ZWO OIII 31 mm 7 nm: 21x600" (gain: 139.00) -20C bin 1x1

Integration: 7.9 hours

Avg. Moon age: 21.58 days

Avg. Moon phase: 55.80%

Bortle Dark-Sky Scale: 5.00

Astrometry.net job: 2902561

RA center: 23h 46' 35"

DEC center: +80° 55' 53"

Pixel scale: 1.719 arcsec/pixel

Orientation: 179.398 degrees

Field radius: 0.659 degrees

Resolution: 2248x1600

Locations: Mapleton Lateral Observatory, Mapleton, Utah, United States

Data source: Backyard


930 LY

An oh so rare these days attempt at a target I have not imaged before. I saw some really beautiful work on this target on Astrobin and decided to try it since it was in the right part of the sky. It turns out to be incredibly dim, so after some work at 300 s in Hα I used 600 s subs for the this and still didn’t pick up very much. The nebulosity is just barely above background. Despite using narrowband filters, I suspect I need darker sky for this target (it sits within the light dome of Provo, Utah even at the best times of year) and as always it would of course benefit from more integration. A little web research indicates this is an old planetary nebula, some call the Valentine Rose.

Date: 21, 24 Aug 2019
Subject: Sh2-174, Valentine Rose Nebula
Scope: AT8IN+High Point Scientific Coma Corrector
Filters: ZWO 31 mm diameter unmounted 7 nm Hα, OIII
Mount: EQ-6 (EQMOD 2.000j)+PEC
Guiding: Orion Thin Off-axis Guider + ASI120MM-mini +PHD 2.6.6 (Win 10 ASCOM)
Camera: ASI1600MM-Cool, -20 °C, Gain 139 Offset 21
Acquisition: Sequence Generator Pro
Exposure: 31x300 and 11x600 Hα, 21x600 OIII
Stacking: Deep Sky Stacker 4.2.2 (64-bit) dark+flat+bias, κ-σ stacking with κ = 1.5.
Processing: StarTools 1.4.352: Software binned 2x2, cropped, wiped, developed, HDR optimized, deconvoluted, and untrack denoised the Hα and OIII data separately. Combined using Annie’s Astro Actions HO Bicolor process. Many cycles of Curves & Levels, saturation boost, capped by some layer-masked Levels. AstroFrame.



David Dearden
License: None (All rights reserved)

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Sh2-174, "Valentine Rose" Nebula, HO Bicolor, 21 & 24 Aug 2019, 


            David Dearden