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DASCH: Bringing 100+ Years of Photographic Data into the 21st Century and Beyond
Peter K. G. Williams, 2025.
What it's used for here
Describes Data Release 7 (finalised 29 December 2024), which supersedes DR1-DR6: 429,274 plate mosaics, 23.6 billion B magnitudes for 252 million sources calibrated to APASS DR8; typical light-curve rms about 0.15 mag. The release Schaefer and Hippke used in 2016 is no longer served, so DR7 is the only reproducible basis for the century-fade question. See also https://dasch.cfa.harvard.edu/dr7/ for the known-issues list, colour terms and the daschlab API.
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Research copy, for editors and curators. The work is the publisher's, so readers are sent to it. We keep this copy so the citation can be checked if the page changes or goes.
arxiv.org · fetched 30 Oct 2026
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Cite it
Peter K. G. Williams (2025). DASCH: Bringing 100+ Years of Photographic Data into the 21st Century and Beyond. https://arxiv.org/abs/2501.12977
@article{williams2025dasch,
author = {Peter K. G. Williams},
title = {DASCH: Bringing 100+ Years of Photographic Data into the 21st Century and Beyond},
year = {2025},
url = {https://arxiv.org/abs/2501.12977}
}TY - GEN TI - DASCH: Bringing 100+ Years of Photographic Data into the 21st Century and Beyond AU - Peter K. G. Williams PY - 2025 UR - https://arxiv.org/abs/2501.12977 ER -
. “DASCH: Bringing 100+ Years of Photographic Data into the 21st Century and Beyond.” 2025.