DASCH: Bringing 100+ Years of Photographic Data into the 21st Century and Beyond
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arXiv
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| Format: | Preprint |
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2025
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| _version_ | 1866912199674429440 |
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| author | Williams, Peter K. G. |
| author_facet | Williams, Peter K. G. |
| contents | The Harvard College Observatory was the preeminent astronomical data center of the early 20th century: it gathered and archived an enormous collection of glass photographic plates that became, and remains, the largest in the world. For nearly twenty years DASCH (Digital Access to a Sky Century @ Harvard) actively digitized this library using a one-of-a kind plate scanner. In early 2024, after 470,000 scans, the DASCH project finished. Now, this unique analog dataset can be integrated into 21st-century, digital analyses. The key DASCH data products include ~200 TB of plate images, ~16 TB of calibrated light curves, and a variety of supporting metadata and calibration outputs. Virtually every part of the sky is covered by thousands of DASCH images with a time baseline spanning more than 100 years; most stars brighter than B ~ 15 have hundreds or thousands of detections. DASCH Data Release 7, issued in late 2024, represents the culmination of the DASCH scanning project. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_12977 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | DASCH: Bringing 100+ Years of Photographic Data into the 21st Century and Beyond Williams, Peter K. G. Instrumentation and Methods for Astrophysics Digital Libraries The Harvard College Observatory was the preeminent astronomical data center of the early 20th century: it gathered and archived an enormous collection of glass photographic plates that became, and remains, the largest in the world. For nearly twenty years DASCH (Digital Access to a Sky Century @ Harvard) actively digitized this library using a one-of-a kind plate scanner. In early 2024, after 470,000 scans, the DASCH project finished. Now, this unique analog dataset can be integrated into 21st-century, digital analyses. The key DASCH data products include ~200 TB of plate images, ~16 TB of calibrated light curves, and a variety of supporting metadata and calibration outputs. Virtually every part of the sky is covered by thousands of DASCH images with a time baseline spanning more than 100 years; most stars brighter than B ~ 15 have hundreds or thousands of detections. DASCH Data Release 7, issued in late 2024, represents the culmination of the DASCH scanning project. |
| title | DASCH: Bringing 100+ Years of Photographic Data into the 21st Century and Beyond |
| topic | Instrumentation and Methods for Astrophysics Digital Libraries |
| url | https://arxiv.org/abs/2501.12977 |