Collected on 2026-08-30. These fixtures are authentic camera/astronomical images, not AI-generated or synthetic star fields. The three image files are exact byte copies of their upstream originals; only the local filenames were changed. No resizing, cropping, tone mapping, or transcoding was performed.
The images total 7,936,991 bytes (about 7.57 MiB), comfortably below the 30 MiB fixture budget.
| Local file | Test role | Format and dimensions | Bytes | SHA-256 |
|---|---|---|---|---|
esa_tetra3_alt40_az-135_20190729.tiff |
Wide-field, low-SNR, raw 16-bit camera frame | TIFF, 1024 x 768, 16-bit grayscale | 1,573,184 | f5d6c27ac7e8e2114fbeb45196380703e138031819714db7e39f3e101b32b557 |
esa_tetra3_alt60_az-135_20190729.tiff |
Wide-field, low-SNR, raw 16-bit camera frame | TIFF, 1024 x 768, 16-bit grayscale | 1,573,184 | f288f6e1fb3a1299626956e3d44740c0260348c65dd9296ac8e07bb27524a5e9 |
wikimedia_m31_cc0_20190830.png |
Narrower deep-sky target with dense stellar background and companion galaxies | PNG, 4144 x 2822, RGBA | 4,790,623 | 9edbcaab9576e9ee9e7226c97118617c2d74e793b3281d5e56eac68319a05494 |
Applies to:
esa_tetra3_alt40_az-135_20190729.tiffesa_tetra3_alt60_az-135_20190729.tiff
- Institution/project: European Space Agency (ESA),
esa/tetra3, with project contributors. - Repository revision pinned for reproducibility:
f9fa2eb9a32a5efc529e2d86f0b59f35b1e9028d. - Upstream originals:
- The official README at that revision explicitly describes these example data as a real-world image set acquired with a FLIR Blackfly S BFS-U3-31S4M-C camera (Sony IMX265 sensor, 2x2 binning) and a Fujifilm HF35XA-5M 35 mm f/1.9 lens, with an approximately 11.4 degree field of view.
- The original filenames encode
2019-07-29T20:47:26, azimuth-135degrees, and altitude+40or+60degrees. The upstream project does not state a timezone, so the timestamp must not be interpreted as UTC without additional evidence.
- Repository-level licence: Apache License 2.0. No per-image exception is present in the source tree.
- A verbatim copy is included as
LICENSE-ESA-TETRA3-APACHE-2.0.txt(SHA-256d6cbf26a85a5855d30156b89e24adfaaad6a4cd5c6944b08850c1e36f92352dd). - The image bytes were not modified.
These values are derived verification aids, not embedded EXIF. Each original image was blind-solved with tetra3's bundled default database and distortion=[-0.2, 0.1]. The solver reports J2000 equinox coordinates; horizontal FOV and residuals are in degrees and arcseconds respectively.
| Local file | Centre RA | Centre Dec | Horizontal FOV | Roll | Matches | RMS residual |
|---|---|---|---|---|---|---|
esa_tetra3_alt40_az-135_20190729.tiff |
230.667360 deg | +11.034223 deg | 11.426214 deg | 332.279807 deg | 11 | 6.461 arcsec |
esa_tetra3_alt60_az-135_20190729.tiff |
240.464077 deg | +28.940573 deg | 11.421557 deg | 329.049101 deg | 16 | 5.024 arcsec |
The TIFF tags contain image geometry, 16-bit sample depth, uncompressed storage, and a tifffile.py software tag. They do not contain camera make/model, focal length, GPS, an absolute timezone, or celestial WCS.
Applies to wikimedia_m31_cc0_20190830.png.
- Author: Stephen Rahn (
StephenGA/srahnon Flickr), Macon, Georgia, USA. - Capture/publication date stated by the source: 2019-08-30 00:17; timezone unspecified.
- Stable Wikimedia Commons description page:
File:Messier 31 (48645809527).png. - Upstream original:
Messier_31_(48645809527).png. - The Commons page records that the image came from the author's Flickr photograph 48645809527 and that Wikimedia's FlickreviewR 2 verified its licence on 2020-11-11.
- CC0 1.0 Universal Public Domain Dedication.
- Attribution is not legally required by CC0, but the author and source are retained here for scientific provenance.
- The image bytes were not modified.
- Primary object: M31 / NGC 224, the Andromeda Galaxy. Its compact companion M32 and diffuse companion M110 are also visible in the frame.
- Reference position from CDS SIMBAD: ICRS J2000 RA
00h 42m 44.330s, Dec+41d 16m 07.50s(decimal RA10.6847083 deg, Dec+41.2687500 deg). SIMBAD gives an optical angular size of about199.53 x 70.79 arcmin, position angle35 deg. - This is the narrower/deep-sky fixture relative to the 11.4-degree ESA frames. The PNG contains no EXIF or WCS, so the M31 coordinate is a catalogue reference for the depicted target, not a claim that the exact image centre or plate scale is embedded in the file.
The format, dimensions, bit depth/mode, byte lengths, and hashes above were read after download with Pillow and SHA-256. All files opened successfully as single-frame images. Hashes should be checked before using a fixture as a golden test input.