The Sloan Digital Sky Survey V collaboration announced Data Release 20 (DR20), a comprehensive dataset comprising over three million spectra of stars and galaxies collected from observatories in both the Northern and Southern Hemispheres. The release marks a significant expansion of the survey’s geographic scope by incorporating optical spectra obtained for the first time from the Southern Hemisphere at Las Campanas Observatory in Chile, combined with updated observations from Apache Point Observatory in New Mexico. This dual-hemisphere approach enables astronomers to conduct panoptic spectroscopic observations across the entire sky.
DR20 includes 18 new or substantially updated catalogs alongside specialized research tools designed to facilitate scientific investigation. Among the major expansions is the Black Hole Mapper, which tripled or quadrupled its available data compared to the previous release, containing approximately 1.1 million optical spectra representing roughly 500,000 distinct objects. These observations document how supermassive black holes and their surrounding environments change over time through repeated observations of quasars and other targets.
The release also features substantial additions to the Milky Way Mapper component, bringing the combined total to more than 1.5 million stars represented across the survey. Notably, DR20 includes the first carbon-enhanced metal-poor stars identified in the Magellanic Clouds and the first intermediate-mass stripped star, discoveries that offer insights into stellar formation and evolution processes.
A new dimension was added through coordinated observations with the eROSITA X-ray All-Sky Survey, enabling researchers to match X-ray detections with optical measurements to better characterize energetic objects such as active galactic nuclei, galaxy clusters, and active stars. The Local Volume Mapper component expanded significantly with integral field spectroscopy maps of 169 tiles covering approximately 300,000 spectra, capturing detailed views of galactic regions, planetary nebulae, and nearby galaxies including the Rosette and Orion nebulae.
The collaboration made the data publicly accessible through multiple platforms, including the Science Archive Server and interactive visualization tools such as LVMvis, along with Python notebook tutorials. Officials emphasized that the data release was designed to serve professional astronomers, students, educators, and the general public interested in astronomical research.
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