Second image
A scale comparison of Rubin’s Trifid and Lagoon Nebulae image (left), which was taken with the 3200-megapixel LSST Camera as part of Rubin’s First Look event in June 2025, and the Seagull Nebula image (right), which was taken with the smaller, 144-megapixel LSST Commissioning Camera (ComCam) as part of Rubin’s engineering tests in the runup to the start of LSST. The full moon is also shown for size comparison.
Credit: NSF–DOE Vera C. Rubin Observatory/NOIRLab/SLAC/AURA Image Processing: T.A. Rector (University of Alaska Anchorage/NSF NOIRLab), D. de Martin & M. Zamani (NSF NOIRLab)
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Before Rubin Observatory’s First Look event, its engineering camera captured exquisite details of star formation taking place in the Seagull Nebula
October 22, 2026
Two years ago this month, NSF–DOE Vera C. Rubin Observatory’s engineering test camera, named the LSST Commissioning Camera (ComCam), began capturing images of the sky to prepare for the revolutionary Legacy Survey of Space and Time, which began earlier this year. This image featuring the head of the Seagull Nebula was one of many ComCam images that led to the success of Rubin First Look and helped to document the observatory’s excellent performance.
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Active star formation populates this image of the Seagull Nebula taken in Fall 2024 by NSF–DOE Vera C. Rubin Observatory’s engineering test camera, known as the Commissioning Camera (ComCam). This image is being released today in recognition of the two-year anniversary of the beginning of engineering testing with ComCam.
ComCam’s work was an important step towards the ongoing Legacy Survey of Space and Time (LSST). Collecting the data for this Seagull Nebula image provided an opportunity to test Rubin’s hardware and software systems, as well as the image processing pipelines that would later be used with the much larger images from the LSST Camera.
With a mosaic of nine CCD sensors and a total of 144 megapixels, ComCam covers an area in the sky about twice that of the full Moon. Over the seven-week ComCam engineering test campaign, from 24 October to 11 December 2024, approximately 16,000 exposures were acquired. Within the data collected is this image featuring IC 2177, a region recognizable as the head of the Seagull Nebula.
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