Celestial Quadrants & Astrometric Plates
Each plate corresponds to a field angle of 4.5° square, exposed using orthochromatic emulsions prepared on drawn sheet glass. Filter the catalog by celestial hemisphere below.
Quadrant Ursa Major Alpha
High-latitude astrometric zone encompassing the circumpolar guide stars. Contains detailed astrometry for double-star separation down to 0.4 arcseconds.
Cygnus Veil & North America Field
Dense stellar background near galactic longitude 85°. High resolution of interstellar dark absorption rifts mapped with red-sensitive panchromatic emulsion.
Orion Trapezium & Great Nebula
Key reference field for magnitude scaling. Features calibrated microdensitometer traces taken across the core star cluster to preserve dynamic range.
Aquila Equatorial Meridian
Cross-calibration plate for atmospheric extinction models. Mapped along the celestial equator with simultaneous double transit recordings.
Carina Nebula & Keyhole Basin
Deep southern survey zone recorded at Cerro Ventoso. Reveals complex stellar winds and filamentary dust clouds surrounding variable hypergiants.
Centaurus Core & Omega Cluster
Ultra-dense globular cluster field. Resolves over 50,000 distinct stellar centroids across a single plate using the 60-centimetre Cooke photographic doublet.
Technical Log of Plate Emulsions
| Formula Code | Base Material | Spectral Sensitivity | Resolving Power | Standard Developer |
|---|---|---|---|---|
| EM-22-SILVER | Drawn Crown Glass (2.2 mm) | 380 nm – 510 nm (Blue/Violet) | 145 lines/mm | Pyrogallol-Sodium Sulfite |
| EM-34-ORTHO | Ground Float Glass (3.0 mm) | 390 nm – 580 nm (Visual Band) | 160 lines/mm | Metol-Hydroquinone Cold Stock |
| EM-48-PAN | Invar-edged Glass (2.5 mm) | 380 nm – 680 nm (Full Spectrum) | 180 lines/mm | Glycin Slow Agitation Formula |