spacetelescope/romancal
Dec 2024 – Mar 2026
13 Months active
Languages Used
PythonYAMLrstreStructuredText
Technical Skills
AstronomyAstropyCoordinate SystemsWCSGWCSPipeline Development
Jonathan Eisenhamer
PROFILE
Jonathan Eisenhamer
Over thirteen months, contributed to the spacetelescope/romancal repository by building and refining calibration pipelines, data processing workflows, and telescope pointing systems for Roman Space Telescope data. Developed features such as velocity aberration correction, GAIA-aligned WCS persistence, and robust ramp fitting algorithms, emphasizing accuracy and reproducibility. Leveraged Python, Astropy, and GitHub Actions to implement scalable solutions for WCS handling, PSF modeling, and metadata management. Improved CI/CD reliability, enhanced test coverage, and migrated dependencies to modern packages like STPSF. Addressed engineering database integration, error handling, and regression testing, resulting in more reliable, maintainable, and scientifically robust astronomical data products.
Overall Statistics
Feature vs Bugs
89%Features
Repository Contributions
34Total
Bugs
2
Commits
34
Features
16
Lines of code
8,004
Activity Months13
Your Network
50 peopleShared Repositories
15
BrettMember
Dave DavisMember
Tyler DesjardinsMember
Eddie SchlaflyMember
Eddie SchlaflyMember
Harish KhandrikaMember
Larry BradleyMember
Melanie ClarkeMember
mairanMember
Work History
March 2026
3 Commits • 2 Features
Mar 1, 2026March 2026 monthly summary for spacetelescope/romancal: Delivered a major upgrade to ramp fitting and pointing reliability, yielding higher-quality calibrations and more robust pipeline processing. Likelihood Fitting is now the primary ramp fitting algorithm, with a new rejection_threshold parameter to improve data quality, and the previous Optimized Least-squares path has been deprecated. In telemetry-outage scenarios, the pointing system was hardened by leveraging header quaternion data and guide star positions, and by refining the FGS matrix and correcting transposition errors. These changes improve calibration accuracy, reduce manual rework, and increase pipeline throughput, supported by clear commit history and a defined deprecation path.
3 Commits • 2 Features
Mar 1, 2026March 2026 monthly summary for spacetelescope/romancal: Delivered a major upgrade to ramp fitting and pointing reliability, yielding higher-quality calibrations and more robust pipeline processing. Likelihood Fitting is now the primary ramp fitting algorithm, with a new rejection_threshold parameter to improve data quality, and the previous Optimized Least-squares path has been deprecated. In telemetry-outage scenarios, the pointing system was hardened by leveraging header quaternion data and guide star positions, and by refining the FGS matrix and correcting transposition errors. These changes improve calibration accuracy, reduce manual rework, and increase pipeline throughput, supported by clear commit history and a defined deprecation path.
March 2026
February 2026
4 Commits • 2 Features
Feb 1, 2026February 2026 ROMANCAL monthly summary focused on delivering performance, reliability, and pipeline compatibility improvements. Key work centered on Pixel map computations and snowball detection within ramp fitting, with an emphasis on speed, correctness, and test stability. Key features delivered: - Pixel map computation improvements: parameterized stepsize and order for faster outlier detection and resampling; fixed pixmap_stepsize type from float to integer to align with updated gwcs_blot API. - Snowball detection enhancements: added parameters for snowball detection in ramp fitting to handle large events; stabilized tests and pinned the stcal dependency for compatibility. Major bugs fixed: - Correct pixmap_stepsize type enforced (float -> integer) to prevent runtime issues with the new gwcs_blot workflow. - Removed skip of snowball tests to restore full validation coverage and improve reliability. Overall impact and accomplishments: - Faster, more reliable data processing for ROMANCAL; improved accuracy in outlier detection and resampling; more robust ramp fitting for large events; better alignment with GWCS/STScI pipelines, reducing production risk. - Demonstrated collaboration and code quality through co-authored commits across teams. Technologies/skills demonstrated: - Python-based data processing optimizations, parameterization, and typing changes; test stabilization and dependency pinning; integration with GWCS and STScI pipeline components; strong collaboration and CI-ready changes.
February 2026
4 Commits • 2 Features
Feb 1, 2026February 2026 ROMANCAL monthly summary focused on delivering performance, reliability, and pipeline compatibility improvements. Key work centered on Pixel map computations and snowball detection within ramp fitting, with an emphasis on speed, correctness, and test stability. Key features delivered: - Pixel map computation improvements: parameterized stepsize and order for faster outlier detection and resampling; fixed pixmap_stepsize type from float to integer to align with updated gwcs_blot API. - Snowball detection enhancements: added parameters for snowball detection in ramp fitting to handle large events; stabilized tests and pinned the stcal dependency for compatibility. Major bugs fixed: - Correct pixmap_stepsize type enforced (float -> integer) to prevent runtime issues with the new gwcs_blot workflow. - Removed skip of snowball tests to restore full validation coverage and improve reliability. Overall impact and accomplishments: - Faster, more reliable data processing for ROMANCAL; improved accuracy in outlier detection and resampling; more robust ramp fitting for large events; better alignment with GWCS/STScI pipelines, reducing production risk. - Demonstrated collaboration and code quality through co-authored commits across teams. Technologies/skills demonstrated: - Python-based data processing optimizations, parameterization, and typing changes; test stabilization and dependency pinning; integration with GWCS and STScI pipeline components; strong collaboration and CI-ready changes.
January 2026
1 Commits • 1 Features
Jan 1, 2026January 2026 monthly summary for spacetelescope/romancal: Delivered velocity aberration correction in telescope pointing to improve the accuracy of orientation adjustments based on commanded positions, enabling higher-quality ROMANCAL data products.
1 Commits • 1 Features
Jan 1, 2026January 2026 monthly summary for spacetelescope/romancal: Delivered velocity aberration correction in telescope pointing to improve the accuracy of orientation adjustments based on commanded positions, enabling higher-quality ROMANCAL data products.
January 2026
December 2025
1 Commits
Dec 1, 2025December 2025 monthly summary for spacetelescope/romancal: Focused on stabilizing regression tests against the CRDS TVAC baseline. Delivered a fix to align regression tests' exposure start times with the CRDS TVAC baseline, improving test accuracy and reliability. The changes ensure tests reference correct temporal contexts and validate behavior against the expected CRDS baseline, reducing false negatives and supporting robust CI.
December 2025
1 Commits
Dec 1, 2025December 2025 monthly summary for spacetelescope/romancal: Focused on stabilizing regression tests against the CRDS TVAC baseline. Delivered a fix to align regression tests' exposure start times with the CRDS TVAC baseline, improving test accuracy and reliability. The changes ensure tests reference correct temporal contexts and validate behavior against the expected CRDS baseline, reducing false negatives and supporting robust CI.
November 2025
3 Commits • 1 Features
Nov 1, 2025November 2025 monthly summary for spacetelescope/romancal: Delivered significant telescope pointing system enhancements to increase accuracy, flexibility, and reliability. Implemented default orientation in the API, dynamic target apertures, velocity aberration correction, and EngdbMast integration improvements, setting a foundation for more robust calibration workflows and data-driven pointing.
3 Commits • 1 Features
Nov 1, 2025November 2025 monthly summary for spacetelescope/romancal: Delivered significant telescope pointing system enhancements to increase accuracy, flexibility, and reliability. Implemented default orientation in the API, dynamic target apertures, velocity aberration correction, and EngdbMast integration improvements, setting a foundation for more robust calibration workflows and data-driven pointing.
November 2025
September 2025
1 Commits
Sep 1, 2025September 2025 monthly overview for spacetelescope/romancal focused on strengthening test infrastructure reliability and QA outcomes. The primary effort delivered robustness against engineering DB availability issues, resulting in more stable data retrieval and reduced CI/test flakiness.
September 2025
1 Commits
Sep 1, 2025September 2025 monthly overview for spacetelescope/romancal focused on strengthening test infrastructure reliability and QA outcomes. The primary effort delivered robustness against engineering DB availability issues, resulting in more stable data retrieval and reduced CI/test flakiness.
August 2025
4 Commits • 3 Features
Aug 1, 2025Summary for 2025-08: Focused on strengthening pointing metadata reliability, improving WCS update workflows, and enabling aberration calibration for Roman uncal data. Delivered three core items in romancal: (1) Pointing metadata management and orientation correctness, centralizing updates via update_meta and ensuring pointing quality is PLANNED or CALCULATED based on update success; fixed roll reference calculation to ensure correct celestial orientation. Commits tied to this work include RCAL-1121: Fix missing/mistaken meta assignments and a roll calculation fix. (2) TweakRegStep VO timeout configuration, adding a vo_timeout parameter to configure VO catalog service requests (default 120s, min 0). This improves reliability when interacting with external services. (3) Roman velocity aberration correction script, introducing roman_set_velocity_aberration to compute and update velocity aberration information in Roman uncal data, with accompanying docs, configuration entries, and tests.
4 Commits • 3 Features
Aug 1, 2025Summary for 2025-08: Focused on strengthening pointing metadata reliability, improving WCS update workflows, and enabling aberration calibration for Roman uncal data. Delivered three core items in romancal: (1) Pointing metadata management and orientation correctness, centralizing updates via update_meta and ensuring pointing quality is PLANNED or CALCULATED based on update success; fixed roll reference calculation to ensure correct celestial orientation. Commits tied to this work include RCAL-1121: Fix missing/mistaken meta assignments and a roll calculation fix. (2) TweakRegStep VO timeout configuration, adding a vo_timeout parameter to configure VO catalog service requests (default 120s, min 0). This improves reliability when interacting with external services. (3) Roman velocity aberration correction script, introducing roman_set_velocity_aberration to compute and update velocity aberration information in Roman uncal data, with accompanying docs, configuration entries, and tests.
August 2025
July 2025
1 Commits • 1 Features
Jul 1, 2025Monthly summary for 2025-07 focused on delivering the Roman Observatory Orientation Modules and WCS computations in spacetelescope/romancal. This work establishes the foundation for accurate telescope pointing, robust WCS handling, and data-driven orientation workflows, enabling downstream science pipelines and engineering teams to rely on consistent pointing estimates and updated WCS metadata.
July 2025
1 Commits • 1 Features
Jul 1, 2025Monthly summary for 2025-07 focused on delivering the Roman Observatory Orientation Modules and WCS computations in spacetelescope/romancal. This work establishes the foundation for accurate telescope pointing, robust WCS handling, and data-driven orientation workflows, enabling downstream science pipelines and engineering teams to rely on consistent pointing estimates and updated WCS metadata.
June 2025
1 Commits • 1 Features
Jun 1, 2025June 2025: Delivered the L3 PSF Model for Roman Space Telescope data in romancal, refactoring PSF creation to support Level 3 mosaic processing, including scaling, smoothing, and azimuthal averaging, along with dependency updates and tests to ensure robustness of L3 PSF generation.
1 Commits • 1 Features
Jun 1, 2025June 2025: Delivered the L3 PSF Model for Roman Space Telescope data in romancal, refactoring PSF creation to support Level 3 mosaic processing, including scaling, smoothing, and azimuthal averaging, along with dependency updates and tests to ensure robustness of L3 PSF generation.
June 2025
April 2025
1 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for romancal: Focused on delivering GAIA-aligned WCS persistence to improve data product reliability and downstream analyses.
April 2025
1 Commits • 1 Features
Apr 1, 2025April 2025 monthly summary for romancal: Focused on delivering GAIA-aligned WCS persistence to improve data product reliability and downstream analyses.
February 2025
12 Commits • 2 Features
Feb 1, 2025February 2025 (2025-02) — romancal monthly summary focused on delivering end-to-end TVAC/FPS data processing and stabilizing data dependencies via a STPSF migration. The work improved data processing reliability, CI/CD resiliency, and reproducibility across environments, enabling faster calibration workflows and business value for the telescope data pipeline.
12 Commits • 2 Features
Feb 1, 2025February 2025 (2025-02) — romancal monthly summary focused on delivering end-to-end TVAC/FPS data processing and stabilizing data dependencies via a STPSF migration. The work improved data processing reliability, CI/CD resiliency, and reproducibility across environments, enabling faster calibration workflows and business value for the telescope data pipeline.
February 2025
January 2025
1 Commits • 1 Features
Jan 1, 2025January 2025 monthly summary for spacetelescope/romancal: Delivered a major WCS enhancement in the mosaic pipeline by refactoring WCS generation/handling and adding GWCS conversion utilities to streamline skycell-to-WCS transformations. Implemented roundtrip L3 WCS info (wcsinfo) improvements for skycell-based specifications, increasing accuracy and robustness of WCS roundtrip transformations in image mosaics. Updated tests to reflect the new functionality, enabling more reliable mosaics and reducing downstream calibration drift. Commit RCAL-930 Roundtrip L3 wcsinfo especially when skycell specifications are used (#1585): 8422362dc33e0d4b3dc6702274b07c740acda37c. These changes improve data quality and reliability for downstream analysis and enable faster, less error-prone mosaicking workflows.
January 2025
1 Commits • 1 Features
Jan 1, 2025January 2025 monthly summary for spacetelescope/romancal: Delivered a major WCS enhancement in the mosaic pipeline by refactoring WCS generation/handling and adding GWCS conversion utilities to streamline skycell-to-WCS transformations. Implemented roundtrip L3 WCS info (wcsinfo) improvements for skycell-based specifications, increasing accuracy and robustness of WCS roundtrip transformations in image mosaics. Updated tests to reflect the new functionality, enabling more reliable mosaics and reducing downstream calibration drift. Commit RCAL-930 Roundtrip L3 wcsinfo especially when skycell specifications are used (#1585): 8422362dc33e0d4b3dc6702274b07c740acda37c. These changes improve data quality and reliability for downstream analysis and enable faster, less error-prone mosaicking workflows.
December 2024
1 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for spacetelescope/romancal focusing on WFI WCS velocity aberration correction. Delivered a velocity aberration correction frame and integrated differential velocity aberration (DVA) corrections into the assign_wcs step to improve astrometric accuracy by accounting for observatory motion. The change aligns ROMANCAL's WCS workflow with mission reference frames and enhances cross-matching with reference catalogs for WFI data. Commit RCAL-853 documents the change and provides traceability.
1 Commits • 1 Features
Dec 1, 2024December 2024 monthly summary for spacetelescope/romancal focusing on WFI WCS velocity aberration correction. Delivered a velocity aberration correction frame and integrated differential velocity aberration (DVA) corrections into the assign_wcs step to improve astrometric accuracy by accounting for observatory motion. The change aligns ROMANCAL's WCS workflow with mission reference frames and enhances cross-matching with reference catalogs for WFI data. Commit RCAL-853 documents the change and provides traceability.
December 2024
Activity
Loading activity data...
Quality Metrics
Correctness89.8%
Maintainability88.8%
Architecture88.2%
Performance84.2%
AI Usage25.8%
Skills & Technologies
Programming Languages
PythonYAMLreStructuredTextrst
Technical Skills
API DevelopmentAPI IntegrationAstronomyAstronomy SoftwareAstropyBackend DevelopmentCI/CDCalibration PipelineCommand-line ToolsCoordinate SystemsData AnalysisData ModelingData ProcessingDatabase InteractionDocumentation
Repositories Contributed To
Overview of all repositories you've contributed to across your timeline