Smithsonian/layup

Orbit fitting at LSST scale

Stars: 10
Forks: 2
Open beginner issues: 3
Indexed issues: 33
Avg merge: 1d 1h
Merged PRs (30d): 60

Dominant language: Python
License: MIT
Last GitHub push: Sep 15, 2026
Latest indexed: Sep 20, 2026
Contributing guide: Contributing guide
Code of conduct: Code of conduct
Beginner labels: No beginner labels indexed

Beginner friendly Everything

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32 open issues indexed

A converged fit rejected on reduced chi-square sends the picker to the deferred close-approach root, which never returns Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Smithsonian/layup#591 · Opened Sep 21, 2026
IOD is confined to seq[0], which is too thin on sparse multi-night data Open

Difficulty 4/5 3-5 days Newbie friendliness 68/100

Smithsonian/layup#587 · Opened Sep 15, 2026
BK-IOD cannot be selected: it is reachable only as a fallback after every Gauss root has failed Open

Difficulty 3/5 1-2 days Newbie friendliness 78/100

Smithsonian/layup#586 · Opened Sep 15, 2026
The LM gain ratio lags the step it controls by one iteration, and a rejected step is never rolled back Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

Smithsonian/layup#584 · 5 comments · Opened Sep 13, 2026
The weight matrix ignores `Observation::inverse_covariance`, so an astrometric uncertainty cannot be oriented Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

Smithsonian/layup#583 · 1 comment · Opened Sep 12, 2026
Covariance is formed by inverting the normal matrix, so it comes back indefinite on ill-conditioned short arcs Open

Difficulty 4/5 3-5 days Newbie friendliness 48/100

Smithsonian/layup#582 · 2 comments · Opened Sep 12, 2026
Degrees of freedom underflow when rejection leaves fewer observations than parameters Open

Difficulty 3/5 1-2 days Newbie friendliness 78/100

Smithsonian/layup#581 · Opened Sep 12, 2026
layup demo prepare and how to doesn't have an example for layup unpack Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

Smithsonian/layup#568 · Opened Sep 10, 2026
demo notebook that shows how to use incremental orbitfit from the API/function calls Open

Smithsonian/layup#566 · 1 assignee · Opened Sep 10, 2026
Worker pools are orphaned when layup is stopped in the background Open

Smithsonian/layup#562 · 1 assignee · Opened Sep 9, 2026
Herget: the 2x2 determinant is a free degeneracy diagnostic and is discarded Open

Difficulty 4/5 3-5 days Newbie friendliness 52/100

Smithsonian/layup#559 · 6 comments · Opened Sep 9, 2026
Herget's convergence tolerance is ~30x tighter than useful, costing seeds on near-Earth arcs Open

Difficulty 1/5 Under an hour Newbie friendliness 84/100

Smithsonian/layup#557 · 2 comments · Opened Sep 8, 2026
IOD candidates are screened on seq[0] alone and never retried on the full data Open

Difficulty 3/5 1-2 days Newbie friendliness 74/100

Smithsonian/layup#556 · 4 comments · Opened Sep 7, 2026
Mahalanobis distance to JPL runs high for near-Earth validation fits, and the dynamics are not the cause Open

Difficulty 5/5 Over a week Newbie friendliness 35/100

Smithsonian/layup#551 · Opened Sep 5, 2026
On a failed warm-start fit, retry with a moved seed and a cold start, and keep the better one Open

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Smithsonian/layup#550 · 1 comment · Opened Sep 5, 2026
Gauss triplet selection is blind to close encounters, where the method cannot work Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 52/100

Smithsonian/layup#549 · 1 comment · Opened Sep 5, 2026
Conda installing assit and rebound on a fresh env causes issues Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 48/100

Smithsonian/layup#517 · Opened Sep 1, 2026
Layup vizualize needs a demo command and demo set of files Open

Smithsonian/layup#512 · 1 comment · 1 assignee · Opened Aug 31, 2026
layup orbitfit printing out to screen and log file Open

Difficulty 2/5 1-3 hours Newbie friendliness 68/100

Smithsonian/layup#511 · Opened Aug 31, 2026
Per-object timeout in the batch path Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 52/100

Smithsonian/layup#492 · Opened Aug 26, 2026
Test that .zenodo.json and paper.md agree on authors and affiliations Open

enhancement

Difficulty 3/5 1-2 days Newbie friendliness 65/100

Smithsonian/layup#489 · Opened Aug 26, 2026
Fitting sorcha output from simulated handful of asteroids and TNOs Open

Smithsonian/layup#441 · 1 assignee · Opened Jul 16, 2026
review/update of read the docs documentation Open

Smithsonian/layup#440 · 1 comment · 1 assignee · Opened Jul 16, 2026
Make finalized demo example data for layup utilities Open

Smithsonian/layup#439 · 1 comment · 2 assignees · Opened Jul 16, 2026
Packaging/bootstrap hygiene for the first release (PyPI 0.0.1 stub; bootstrap leftover) Open

bug

Difficulty 4/5 3-5 days Newbie friendliness 50/100

Smithsonian/layup#436 · 5 comments · Opened Jul 10, 2026
Shift-and-stack: joint position+rate covariance weighting (interim: report at time centroid) Open

enhancement orbitfit

Difficulty 2/5 1-3 hours Newbie friendliness 55/100

Smithsonian/layup#399 · Opened Jul 1, 2026
Herget IOD method Open

Smithsonian/layup#311 · 1 comment · 1 assignee · Opened Feb 21, 2026
add animation to visualize? Open

enhancement visualize

Difficulty 5/5 Over a week Newbie friendliness 25/100

Smithsonian/layup#308 · 2 comments · Opened Feb 13, 2026
allow user to specify colour of input object orbits Open

enhancement visualize

Smithsonian/layup#307 · 1 assignee · Opened Feb 13, 2026
add option for interactive vs static output figure for visualize Open

enhancement visualize

Smithsonian/layup#305 · 1 assignee · Opened Feb 13, 2026
Implement Additional ADES Observatory Formats as Needed Open

enhancement

Difficulty 4/5 3-5 days Newbie friendliness 45/100

Smithsonian/layup#282 · 2 comments · Opened May 23, 2025
orbit fit jupyter notebook visualization/interactive fitting with ability to reject data points and refit Open

enhancement notebooks orbitfit visualize

Smithsonian/layup#19 · 1 comment · 2 assignees · Opened Feb 21, 2025

A short digest of beginner-friendly GitHub issues.