Celestial hemisphere:  Northern  ·  Constellation: Taurus (Tau)  ·  Contains:  112 bet Tau  ·  118 Tau  ·  125 Tau  ·  132 Tau  ·  26 Aur  ·  Alnath  ·  El Nath (βTau)  ·  PK178-02.1  ·  PK184-02.1  ·  Sh2-240  ·  The star 118Tau  ·  The star 125Tau  ·  The star 132Tau  ·  The star 26Aur  ·  The star Elnath
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Sh2-240, Spaghetti Nebula with Tamron 135 f/2.8, 7 Jan 2017, David Dearden
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Sh2-240, Spaghetti Nebula with Tamron 135 f/2.8, 7 Jan 2017

Getting plate-solving status, please wait...
Sh2-240, Spaghetti Nebula with Tamron 135 f/2.8, 7 Jan 2017, David Dearden
Powered byPixInsight

Sh2-240, Spaghetti Nebula with Tamron 135 f/2.8, 7 Jan 2017

Equipment

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Acquisition details

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Description

This image was a first in many ways. It was a first attempt at this large, dim, difficult target. It was the first use of the Tamron 135 mm f/2.8 lens I bought for $15 on e-Bay. It was my first try at using high gain with the ASI1600MM-Cool, and it was first light for the Tamron 135+ASI1600MM-Cool combination. I didn’t get any blue data (the neighbor’s darn tree got in the way again), so I cheated: I used the Hα data both for luminance and for R, and I put the R data in the B channel. All things considered, it could have turned out worse. I had to process the heck out of this to get a result that was anywhere near reasonable.

Date: 7 Jan 2017

Subject: Sh2-240 (Simeis 147) Spaghetti Nebula supernova remnant

Scope: Tamron 135 mm f/2.8 lens

Filters: ZWO 31 mm RG, ZWO 7nm Hα

Mount: EQ-6 (EQMOD)+PEC

Guiding: Finder/Guider+DSI IIc+PHD 2.6.2.4 (Win 10 ASCOM)

Camera: ASI1600MM-Cool, -20 °C, acquired Hα 1x1 RG 2x2, Gain 300 Offset 50

Acquisition: Sequence Generator Pro 2.6.0.1

Exposure: 80x180 s Hα, 55x45 s R, G

Stacking: Neb 4.1.2, flats & darks, trans+rot align, Nebulosity 1.5σ stack.

Processing: too extensive to detail.

Comments

Revisions

  • Sh2-240, Spaghetti Nebula with Tamron 135 f/2.8, 7 Jan 2017, David Dearden
    Original
  • Final
    Sh2-240, Spaghetti Nebula with Tamron 135 f/2.8, 7 Jan 2017, David Dearden
    B

B

Description: I'm not sure this is a definite improvement, but I realized I was double-subtracting bias so I corrected that and found I had less color cast than before. This is stretched much more aggressively than the original image. It is also cropped much less than the original. The colors are a mess, but I suppose that is to be expected when you don't have any real blue data.

Uploaded: ...

Sky plot

Sky plot

Histogram

Sh2-240, Spaghetti Nebula with Tamron 135 f/2.8, 7 Jan 2017, David Dearden

In these public groups

ZWO ASI1600MM/QHY163M