Riders in Auriga's Chariot, HSO and SHO, 12 Dec 2017 (David Dearden)

Riders in Auriga's Chariot, HSO and SHO, 12 Dec 2017

I’m continuing to have fun with the Tamron 135 mm lens. A temperature inversion had set in, but night skies continued to be relatively clear. Auriga was positioned well and is full of interesting objects, so I decided to try it. This is narrowband data only. I did the processing for this before I worked on the California Nebula image, but decided to post in the order of acquisition. I got all of these data in one night, which seems fairly rare for me these days. I decided to try both Hubble palette SHO and HSO (the latter an attempt to get closer to “true” color). I think fine structure is more apparent in the Hubble palette.

Date: 12 Dec 2017

Subject: Auriga, including IC 405 (Flaming Star Nebula), IC 410 (Tadpole Nebula), IC 417 (Spider and Fly Nebula)

Scope: Tamron 135 mm f/2.8 lens stopped to f/4

Filters: ZWO 31 mm diameter unmounted Hα, OIII, SII (7 nm bandpass)

Mount: EQ-6 (EQMOD 2.000j)+PEC

Guiding: Orion Finder/Guider+ DSI IIc +PHD 2.6.4.5 (Win 10 ASCOM) using predictive PEC algorithm

Camera: ASI1600MM-Cool, -20 °C, Gain 139 Offset 21

Acquisition: Sequence Generator Pro 3.0.0.3

Exposure: 24x300 Hα, 23x300 SII, 24x300 OIII

Stacking: Neb 4.1.6, darks only, trans+rot align, Nebulosity 1.5σ stack and align.

Processing: StarTools 1.4.328: Used StarTools’ “Wipe” module to correct for vignetting, then stretched and deconvoluted each channel separately in StarTools. Aligned the processed layers in Nebulosity then combined in Photoshop using Annie’s Astro Actions’ Hubble Palette module or the RGB module with Hα mapped to R, SII mapped to G, and OIII mapped to B.

Original
Final
B

B

Description: Hα mapped to R, SII to G, and OIII to B

Uploaded: ...

ZWO ASI1600MM/QHY163M
Camera Lens Astrophotography
Narrowband imaging
Low-Cost Astrophotography

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Status	Advanced success
Started	...
Astrometry.net job	1861949
PixInsight job	0FNO7SW52LIF5XIQYN1OLOP31L0U7VJ4
PixInsight queue size	n/a
PixInsight stage	n/a

RA (center)	05h20m40s.98
RA (top/left)	05h08m23s.40
RA (top/right)	05h08m40s.61
RA (bottom/right)	05h31m58s.17
RA (bottom/left)	05h33m44s.79

Dec (center)	+34°04′25″.6
Dec (top/left)	+37°42′31″.7
Dec (top/right)	+30°28′18″.5
Dec (bottom/right)	+30°22′03″.0
Dec (bottom/left)	+37°35′47″.1

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