B161 & LDN 1121

Back to Targets

B161 & LDN 1121

Barnard 161 & LDN 1121 • Dark nebula complex • Cepheus • ~1500 light-years from Earth

🗓️
June – July 2024

B161 and LDN 1121 in Cepheus, imaged from a light polluted urban sky

Overview

This image shows B161 and LDN 1121, two dense dark nebulae embedded within the much larger emission nebula IC 1396. The frame captures just over 10% of IC 1396, focusing on a region where glowing hydrogen, oxygen, and sulphur gas overlap. The inky dark structures are cold clouds of dust that block the light from background stars, creating high contrast silhouettes that are particularly striking in narrowband astrophotography.

Background

IC 1396 is a very photogenic region of the sky. It’s a large object, so well-suited to wide-field telescopes. In fact, I captured it a few years back using my Askar FRA400 telescope. If you have a longer focal length to play with, like my Askar 130PHQ‘s 1000mm, then you can really zoom in to see those details. Most people are drawn to the Elephant’s Trunk Nebula, and I photographed that back in October 2022. There’s a lot more to see in this region of space though, and I decided to return to it in order to snap the lesser-known region next to the Elephant’s Trunk, known as B161 and LDN 1121. Here’s my wide-field view of IC 1396, and the box shows the area covered by my latest image:

Askar FRA400 photo of nebula IC1396, with the region containing B161 and LDN 1121 highlighted

Just out of curiosity, I cropped the old Askar FRA400 view to match my latest attempt with the Askar 130PHQ. Of course it’s not a fair comparison as the two were processed differently, and have different integration times, but use the slider view below and you’ll get an idea of the benefits that a bigger telescope can give. The 130PHQ view is certainly sharper and has more detail, but I’m impressed with how well the FRA400 holds up even when cropped in so much. The differences are definitely more apparent when viewed on a big screen!

Framed astrophoto taken from a light-polluted city, available to buy as a fine art print

Explore the field

1.0×
Objects in this field 13 objects
B 161
Dark nebula
LDN 1121
Dark nebulaAlso catalogued as IC 1396N
IC 1396
Cluster + nebulaAlso catalogued as Cr 439 · Tr 37 · Sh2-131 · LBN 455
The wider nebula that contains B161 and LDN 1121.
LDN 1124
Dark nebula
LDN 1128
Dark nebula
LDN 1112
Dark nebula
LDN 1110
Dark nebula
LBN 456
HII region
LDN 1126
Dark nebula
LDN 1117
Dark nebula
LDN 1127
Dark nebula
LDN 1123
Dark nebula
LDN 1111
Dark nebula
About the labels and credits

Positions and outlines are calculated from a plate solution of this photograph. Outlines are catalogue guides and may not follow every visible filament. Additional catalogue objects may be faint or indistinct in this exposure.

Plate solving and annotation data: SkySolver, by Dominik Sito. Stars: Gaia DR3 and Hipparcos (ESA). Deep-sky data: OpenNGC © Mattia Verga (CC BY-SA 4.0), SIMBAD and VizieR (CDS). Names: Wikipedia (CC BY-SA 4.0) and IAU WGSN. Catalogue overlay adaptations, including styling and selected display names, are shared under CC BY-SA 4.0. Photograph © Lee Pullen.

Close-ups

  • Close-up view of the nebula's central region
  • Close-up view showing a darker area and surrounding nebulosity
  • Close-up viewing showing blue and orange nebulosity
  • Close-up view showing intricate detail

Imaging details

Total exposure
40.5 hours
Dates captured
2 June – 8 July 2024 (five weeks)
Location and sky
Bristol, UK (Bortle 8)

Equipment and software

Telescope
Askar 130PHQ Flatfield Astrograph
Camera
ZWO ASI 2600MC Pro
Mount
Sky-Watcher EQ6-R Pro
Guiding
WO 50mm + ZWO ASI 120MM Mini
Control
ASIAIR Plus
Software
PixInsight, Lightroom
Image by
Lee Pullen

Exposure by filter

Optolong L-Quad Enhance

Channels
RGB (stars)
Subframes
15 × 2 minutes
Integration
30 minutes
View subframe and stack

Single subframe and integrated stack, both with a simple stretch applied.

Optolong L-Quad single subframe
Single subframe2 minutes
Optolong L-Quad integrated stack
Integrated stack30 minutes

Optolong L-Ultimate

Channels
Hα / OIII
Subframes
240 × 5 minutes
Integration
20 hours
View subframe and stack

Single subframe and integrated stack, both with a simple stretch applied.

Optolong L-Ultimate single subframe
Single subframe5 minutes
Optolong L-Ultimate integrated stack
Integrated stack20 hours

Askar Colour Magic D2

Channels
SII / OIII
Subframes
240 × 5 minutes
Integration
20 hours
View subframe and stack

Single subframe and integrated stack, both with a simple stretch applied.

Askar D2 single subframe
Single subframe5 minutes
Askar D2 integrated stack
Integrated stack20 hours

Processing walkthrough

For the main bulk of data — that’s 20 hours of Optolong L-Ultimate and 20 hours of Askar D2 — I used 300-second subframes. This is simply to produce lower numbers of files in order to delay my harddrive from filling up! For the RGB data (Optolong L-Quad Enhance) I used 120-second subframes. This is because I only needed a little bit of data for the stars, so a few short subframes was sufficient.

As for the processing itself, I wanted to make this one more vibrant than usual as a bit of an experiment to see the range of colours I could obtain. I might return to the data one day and tone it down a bit, but I kinda like having something so dazzling in my gallery.

Example astrophotography image promoting one-to-one online astrophotography masterclasses

Seestar S50 image

Here’s an image of this region of space taken using my Seestar S50 telescope. The nebula’s shape is just about becoming apparent after 88 minutes of integration time.

Payment options load when this section is in view. Use the donation page


Discover more from Urban Astrophotography

Subscribe to get the latest posts sent to your email.

Leave a Reply

Your email address will not be published. Required fields are marked *