Add Juno SRU host module - #209
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New host for Juno Stellar Reference Unit EDR images (FITS + detached PDS3 label), modeled on the jiram host API. from_file() returns a Snapshot with a BarrelFOV built from the SIS geometry (512x512, boresight (255.5,255.5), fl 1760.21137 px, radial distortion f(R) = a0 + a1*R + a2*R**2 + a3*R**4) and a per-observation camera frame frozen inertially at START_TIME, since TDI holds the scene at the attitude of exposure start while the spacecraft spins at ~2 rpm. Geometry validated against real EDRs: boresight matches label RA/DEC to <=0.004 deg on three images; 16 Bright Star Catalogue stars match detected sources at 2.6 px rms absolute (ORBIT_62, 1.3 s exposure); 98.4% of bright pixels fall inside the predicted Io disk (ORBIT_60). The star field also pinned down two conventions the SIS leaves ambiguous: its "x, y (row, column)" coordinates put x along the row (the sample axis), and the TDI scene epoch is START_TIME, not midtime (235 px of spin for a 1.3 s exposure). Unit tests check the FOV against the SIS distortion formulas with no SPICE or data dependencies. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VpLS1M97J5Rfdpp8qN9wCk
The hardcoded kernel list in Juno.load_kernels ended in 2021, so any post-2021 observation failed with SPICE(NOFRAMECONNECT) when the SRU host froze its camera frame at load time. Add the weekly CK/SPK pairs covering the 2023-12-30, 2024-04-09 and 2024-06-13 encounters (copied into the OOPS-Resources SPICE store from naif.jpl.nasa.gov/pub/naif/JUNO/kernels/) plus SCLK JNO_SCLKSCET.00210. The new SCLK is furnished last so it takes priority over jno_sclkscet_00128: the old clock extrapolated to 2024 is off by ~2.7 s, a 33 deg pointing error at the 2 rpm spin. For 2013-2021 epochs the two kernels convert identically (0.0 tick difference), so JIRAM/JunoCam results are unchanged. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VpLS1M97J5Rfdpp8qN9wCk
The all-masked fast path returned Pair(np.ones(f.shape), True), but the function's contract is a ratio Scalar, and building a Pair from a 1-D array raises ValueError. Any fully-masked batch through uv_from_xy on a BarrelFOV defining only coefft_xy_from_uv crashed -- e.g. Snapshot.uv_from_coords over surface points that are all hidden from the camera. Return a fully masked Scalar instead, and add a regression test covering both conversion directions. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VpLS1M97J5Rfdpp8qN9wCk
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WalkthroughAdds Juno SRU FITS observation support with PDS metadata parsing, SPICE kernel and camera-frame handling, and Snapshot creation. It adds Juno kernel coverage, SRU field-of-view tests, and corrected fully masked barrel-FOV behavior. ChangesJuno SRU and FOV support
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟡 Moderate · up to The new SRU loader advertises support for detached .LBL inputs, but its current resolution logic can fail to locate the referenced FITS data or choose the wrong file; the documented return_all_planets option is also ineffective. The PR should not merge until detached-label handling is corrected and the parameter contract is fixed or removed. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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In `@oops/hosts/juno/sru/__init__.py`:
- Line 20: Update from_file so return_all_planets controls the returned Snapshot
as documented by restoring the kernel-subfield behavior, or remove the unused
return_all_planets parameter and its documentation if that behavior is no longer
supported.
- Around line 38-48: Update the data/label resolution near Pds3Label so filespec
is passed directly to Pds3Label, allowing it to resolve either label or data
inputs; when the input is a label, derive datspec from the resolved PDS3 label
pointer rather than constructing a .fit or .FIT filename. Preserve case handling
and use the resolved label for subsequent parsing.
In `@tests/hosts/juno/sru/__init__.py`:
- Around line 53-57: Add meaningful assertions to Test_Juno_SRU.runTest covering
from_file() metadata extraction, FITS shape validation, detached-label
resolution, and correct START_TIME camera-frame handling; replace the no-op
implementation with regression checks that exercise each behavior.
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oops/fov/barrelfov.pyoops/hosts/juno/__init__.pyoops/hosts/juno/sru/__init__.pytests/fov/test_barrelfov.pytests/hosts/juno/sru/__init__.py
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Pass filespec straight to Pds3Label, which already resolves a detached .LBL/.lbl label when handed the data file path; when the input is the label, take the data file name from the label's ^IMAGE pointer instead of guessing the extension case with a suffix swap. Addresses review feedback on #209. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VpLS1M97J5Rfdpp8qN9wCk
Replace the placeholder Test_Juno_SRU with checks against a real EDR (orbit-60 Io image, added to the shared test_data/juno/sru tree): metadata extraction, FITS array shape and dummy-pixel layout, detached-label resolution via the .LBL path, the inertially frozen camera frame, boresight agreement with the label RA/DEC to 0.01 deg, and per-observation frame ownership. Skips cleanly when the test data or kernels are unavailable. Addresses review feedback on #209. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01VpLS1M97J5Rfdpp8qN9wCk
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Summary
Adds a host module for the Juno Stellar Reference Unit (SRU), the star tracker operated as a broadband visible (450-1100 nm) low-light science imager, per the SRU EDR/CRT SIS. The API is modeled on the JIRAM host:
oops.hosts.juno.sru.from_file()takes an EDR.FITfile (or its detached.LBL) and returns aSnapshot.BarrelFOVfrom the SIS geometry — 512x512 CCD, boresight (255.5, 255.5), focal length 1760.21137 px, radial distortionf(R) = a0 + a1*R + a2*R^2 + a3*R^4(mapped to BarrelFOV's distance polynomialf(R)*R). Matches the SIS formulas to machine precision (unit-tested with no SPICE/data dependencies).Cmatrix, JIRAM-style). With the spacecraft spinning at ~2 rpm, TDI holds the recorded scene at the attitude of exposure start, so a frame that rotates with the spacecraft would be wrong by up to half an exposure of spin (235 px for a 1.3 s exposure).Juno.load_kernelslist through the 2023-2024 SRU encounters (kernels added to the shared OOPS-Resources/SPICE store from NAIF), with SCLKJNO_SCLKSCET.00210furnished last so it outranks the stalejno_sclkscet_00128(2.7 s off when extrapolated to 2024 = 33 deg of spin; tick-identical to 00128 for 2013-2021, so JIRAM/JunoCam are unaffected).BarrelFOV._solve_ratiobug: the fully-masked fast path returned a malformedPairinstead of a ratioScalar, crashinguv_from_coordswhenever a batch of surface points is entirely hidden from the camera. One-word fix plus regression test.Validation against real EDRs
where_intercepted).The star field resolved two conventions the SIS leaves ambiguous: its "x, y (row, column)" coordinates put x along the row (the sample axis) — the transposed reading masquerades as a plausible-looking roll when fit to a single extended body — and the TDI scene epoch is START_TIME, not mid-exposure.
Notes for reviewers
OOPS-Resources/SPICE/Juno/store (not in git); the load list references them by store-relative path.juno_srubranch draft (FlatFOV, spinning frame).🤖 Generated with Claude Code
https://claude.ai/code/session_01VpLS1M97J5Rfdpp8qN9wCk
Summary by CodeRabbit
New Features
Bug Fixes
Tests