WR 134 (V1769 Cyg)

 Three Nights, One Target ...

This is a personal best for me—not only for total exposure time, but for the patience and persistence it took to capture a target I’ve wanted to image for years. WR 134 is faint, subtle, and notoriously difficult, especially from Western New York, where clear nights are rare and I don’t have the luxury of an observatory. Across three nights, I collected 10 hours and 47 minutes of data—my longest integration to date—and finally gathered enough signal to reveal the delicate OIII bubble surrounding this Wolf–Rayet star.

I processed the image in an HOO palette, mapping hydrogen-alpha (Hα) to red and doubly ionized oxygen (OIII) to green and blue. Because I used a dual-narrowband filter, I captured both emissions at the same time and separated them during processing to build the final composite. Here’s the resulting image:

Image 1: WR 134 (V1769 Cyg)

Image 1: WR 134 (V1769) captured from my backyard over 3 nights in August & early September.

What is it?

Before getting into the equipment and processing details, it’s worth pausing on what makes WR 134 such a compelling subject. The image is not just a pretty field of stars; it captures the visible imprint of a massive star losing material into space and shaping the gas around it.

Object type: Wolf–Rayet star with an ionized wind-blown bubble

WR 134 (also known as V1769 Cyg) is a highly evolved Wolf–Rayet star: a massive, hot stellar core in its final stages of life that is rapidly shedding material. With a surface temperature of about 63,000 K and a luminosity roughly 400,000 times that of the Sun, it drives extreme stellar winds reaching speeds up to 1,700 km/s. Those winds carve out a faint, expanding bubble of ionized gas, visible in narrowband emissions such as hydrogen-alpha and doubly ionized oxygen. The nebula in this image is not a supernova remnant; it is a wind-blown shell, sculpted by continuous mass loss from the star rather than by a single explosive event.

Location in the sky: Cygnus, within the Cygnus OB3 association

WR 134 lies in the rich star fields of Cygnus, only about a degree from the similar Wolf–Rayet star WR 135. Both stars are part of the Cygnus OB3 stellar association, a region filled with massive, short-lived stars. This area sits along the bright band of the Milky Way, making it an excellent target for summer and early autumn imaging. Refer to the finder chart (Image 2) below.

Distance / size / scale

Gaia DR3 measurements place WR 134 at approximately 6,000 light-years from Earth. The surrounding bubble is faint and relatively small compared to supernova remnants, but its structure is revealed beautifully in narrowband imaging—especially in HOO composites where the oxygen-rich arcs stand out sharply against the hydrogen background.

Visual features

The nebula around WR 134 is dominated by:

• Blue-green OIII arcs tracing regions where the fast stellar wind shocks and ionizes surrounding gas.
• Red Hα emission marking slower-moving hydrogen swept up from the interstellar medium.
• Curved, filamentary structures that hint at the star’s rotational wind patterns and possible corotating interaction regions—large-scale structures in the wind that create repeating arcs in long-exposure images.

In HOO processing, these features combine into a distinctive ring-like bubble with layered shells and wisps extending outward.

Why it matters

WR 134 offers a rare look at stellar mass loss in real time. Wolf–Rayet stars shed enormous amounts of material before eventually exploding as supernovae. The bubble around WR 134 shows how these winds shape and enrich the interstellar medium long before the final explosion. WR 134 is also historically significant: it was one of the first stars ever identified as a Wolf–Rayet object due to its unusual emission-line spectrum, helping astronomers define an entire class of massive, short-lived stars.

Image 2: Finder Chart for WR 134 (V1769 Cyg)

Image 2: Finder Chart for WR 134 (V1769).

Prominent Objects in the Field

Object 1: WR 134 (V1769) - Wolf-Rayet Star and associated "Bubble" nebula. The star is located very near the center of the image as indicated in image 3 below. The associated nebula or Oiii ring is concentric to the center of the image.

Object 2: LBN 182 — Large emission nebulosity located from the middle of the frame toward the bottom center. WR 134 and its OIII ring appear embedded within LBN 182.

Object 3: Sh2-104 - A faint emission Nebula located about 14,000 light-years from Earth. It can be found in the upper left of the image. 

Additional details: Open star clusters NGC 6871 and NGC 6883; various dark nebulae, including B146, B147, and multiple Lynds’ Dark Nebulae (LDN); and multiple bright nebulae from Lynds’ Bright Nebulae (LBN).

Image 3: Annotated image of WR 134 (V1769 Cyg)

Annotated image of WR 134 (V1769 Cyg).

Imaging Details

·       Capture dates: August 20, August 28, and September 6, 2026.

• Location: Eden, NY
• Target: WR 134 (V1769 Cyg)
• Total integration: 10 hours and 47 minutes total
• Exposure breakdown:
• 8/20/2026: 74 subs at 180 sec each
• 8/28/2026: 44 subs at 300 sec each
• 9/6/2026: 41 subs at 300 sec each
• All Exposures: Gain = 100, Offset = 50, and Sensor Temp = -10° C
• Filters: Optolong L-eXtreme
• Moon / sky conditions:
• 8/20/2026: Moon 52% First Quarter, transparency = average, and seeing = average.
• 8/28/2026: Moon 100% Full, transparency = above average, and seeing = average.
• 9/6/2026: Moon 26% Waxing Crescent, transparency = above average, and seeing = average.

Equipment Used

• Telescope / lens: Askar FRA400
• Camera: ZWO ASI2600MC Pro
• Mount: Sky-Watcher EQ6-R Pro
• Filters: Optolong L-eXtreme
• Guiding: ZWO 30 mm Mini Guide Scope / ZWO ASI290MM
• Control / acquisition software: N.I.N.A & PHD2
• Other accessories: PrimaLuceLab Sesto Senso 3 & SvBony 241 Pro

Processing Details

• Calibration frames: 50 Darks, 50 Flats, & 50 Dark Flats
• Calibration and integration: All pre-processing was performed in PixInsight 
• Background correction: GraXpert
• Color Calibration: SPCC
• Deconvolution: BlurXTerminator
• Stretching: Multiscale Adaptive Stretch
• Star Removal: StarXTerminator
• Noise reduction: NoiseXTerminator
• Adjust Histogram: Histogram Transformation
• 2nd Application of Noise Reduction: NoiseXTerminator
• Create HOO Image: Narrowband Normalization Process
• Reduce Halos: Combination of Dodge and Burn Process and Blemish Blaster Script
• Sharpen: Image Blend Script (High Pass Filter)
• Enhance Dark Structure: Dark Structure Enhance Script
• Contrast and Saturation: Curves Transformation
• Star processing: 
• Increased star saturation with Curves Transformation
• Removed Green Noise with SCNR
• Removed Magenta color from stars with Correct Magenta Stars Script
• Combine Starless and Star Images: Pixel Math (screen stars)

Conclusion

This target was definitely a challenge. Imaging with a one-shot color (OSC) camera and a dual-narrowband filter with a relatively wide 7 nm bandpass put me at a slight disadvantage. The first two sessions were completed under a bright Moon, which affected the OIII signal more than the Hα signal. Adding the third session, when the Moon did not rise until after the target had dropped below the horizon, helped bring out the faint OIII structure. I may eventually upgrade to a tighter-bandpass filter or even a mono camera with separate emission-line filters, and if I do, I could add that new data to this project. For now, though, I have no immediate plans to change it. This image is done, and I’m pleased with it.

This project reminded me how much faint structure rewards patience. Three nights, three different Moon phases, and a lot of careful processing came together to reveal a bubble I’ve wanted to capture for years.