OmniSky v1
Collection
Crossmatched, normalized multimodal astronomy: 20.4M DESI DR1 objects x 24 catalogs, 822 GB. Start with mmu-norm-index. • 20 items • Updated
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HSC PDR3 Deep/UltraDeep image cutouts — L1 (release v1)
This L1 repository contains 55,346 objects matched across the release, in 79 shards (about 57 GB). Each object has 160×160-pixel cutouts at 0.168″ per pixel in five bands (hsc-g/r/i/z/y), with per-pixel inverse variance and a mask.
Schema
image struct: band (5), flux (ADU at AB zeropoint 27), ivar, mask (true = CLEAN — verified empirically), psf_fwhm, scale. Plus cmodel magnitudes/errors, extendedness, extinction a_*, shape columns, ra, dec, object_id.
Conversion (verified against cmodel photometry, point-source ratio 1.008–1.011): flux_nJy = pixel × 57.54399, ivar_nJy = ivar / 57.54399².
Data notes
- Coadd noise is correlated. The robust background σ is about 1.12× the σ implied by
ivar, and pixel covariance is unavailable. - The upstream mask retains BAD, SAT, and NO_DATA only; full native flags are unavailable.
- The cutouts include a scalar seeing FWHM but no complete WCS. Precision PSF work needs additional information.
- Fluxes are observed values. The
a_*extinction values support optional corrected views.
The L2 scaling statistics, fit on the training split, are in l2_stats/v1/hsc_pdr3_dud_22.5.json. Credit: HSC-SSP PDR3 (Aihara et al. 2022). Sourced via Multimodal Universe.
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