# Image Reduction and Analysis Facility ## Identification IRAF is a package-oriented astronomical data-reduction environment with its own command language, startup and logout configuration, NOAO packages, and scientific tasks. The notebook preserves probable operational installation and command evidence. ## Notebook evidence - [[Scanned_20260730-1659#PDF page 58 — IRAF shell, installation, and NOAO optical-astronomy package|PDF page 58: IRAF shell, installation, and NOAO optical-astronomy package]] — IRAF—the Image Reduction and Analysis Facility—is a general astronomical data-reduction system developed by NOAO; the community distribution continues after NOAO ended institutional maintenance. The page captures its CL shell semantics, `login.cl`, package exit/logout commands, and its broad optical-astronomy tool ecology. The handwritten “IRAF64” and 2019 dates likely record an installation attempt on a 64-bit environment. - [[Scanned_20260730-1659#PDF page 59 — IRAF package/task inventory and logout configuration|PDF page 59: IRAF package/task inventory and logout configuration]] — The list closely resembles NOAO/IRAF package names: `artdata`, `digiphot`, `onedspec`, `astcat`, `focas`, `rv`, `astrometry`, `imred`, `observatory`, `surfphot`, `astutil`, `mtlocal/mtlcal`, `obsutil`, and `twodspec`. Historical IRAF documentation describes the core and NOAO package trees as dozens of packages and hundreds of tasks. The page moves from science-package taxonomy to global shell/logout configuration, showing hands-on system administration rather than casual astronomy reading. ## Relationships and overlays The source places this record in an evidence cluster with [[IRAF Command Language|IRAF Command Language]] · [[IRAF Logout File|IRAF Logout File]] · [[IRAF netstatus|IRAF netstatus]] · [[IRAF NOAO Package|IRAF NOAO Package]] · [[IRAF Task|IRAF Task]] · [[IRAF wprotect|IRAF wprotect]] · [[Japan Aerospace Exploration Agency|Japan Aerospace Exploration Agency]] · [[National Optical Astronomy Observatory|National Optical Astronomy Observatory]] · [[Optical Astronomy|Optical Astronomy]] · [[SODAR|SODAR]]. The occurrence contributes to the notebook's larger model of [[Identity Continuity|identity continuity]], [[Device Sovereignty|device sovereignty]], and [[Continuity Architecture|continuity architecture]]. ## Evidentiary status and open leads Recover machine/OS and installation logs for the 2019 IRAF setup; resolve C-SODAR/ISAAS/JAXA. ## Source - [[Scanned_20260730-1659|Scanned_20260730-1659]]