| --- |
| pretty_name: "AION-Search Streams, Shells, and Hard Negatives" |
| license: mit |
| tags: |
| - astronomy |
| - stellar-streams |
| - shell-galaxies |
| - tidal-features |
| - semantic-search |
| size_categories: |
| - n<1K |
| configs: |
| - config_name: default |
| data_files: |
| - split: train |
| path: data/train-*.parquet |
| - split: test |
| path: data/test-*.parquet |
| dataset_info: |
| features: |
| - name: image_rgb |
| dtype: image |
| - name: image_stretched |
| dtype: image |
| - name: image_bands |
| list: |
| list: |
| list: |
| dtype: float32 |
| - name: ra |
| dtype: float64 |
| - name: dec |
| dtype: float64 |
| - name: label |
| dtype: string |
| splits: |
| - name: train |
| num_examples: 72 |
| - name: test |
| num_examples: 30 |
| --- |
| |
| # AION-Search streams, shells, and hard negatives |
|
|
| Catalog with 102 objects: 39 streams, 34 |
| shells, and 29 negatives. |
|
|
| ## Splits |
|
|
| The test split is a reproducible stratified random sample with exactly 10 |
| streams, 10 shells, and 10 neither objects. The remaining 72 objects form the |
| training split (29 streams, 24 shells, 19 neither). Random seed: `20260802`. |
|
|
| ## Columns |
|
|
| - `image_rgb`: 256 x 256 Legacy Survey DR10 color JPEG. |
| - `image_stretched`: the same RGB cutout after the AION-Search per-channel |
| arcsinh stretch, grayscale conversion, inversion, and a 0.7-pixel Gaussian blur. |
| - `image_bands`: Legacy Survey DR10 flux planes as nested float32 lists with |
| shape `(4, 256, 256)` and band order `(g, r, i, z)`. |
| - `ra`, `dec`: ICRS coordinates in decimal degrees. |
| - `label`: one of `stream`, `shell`, or `neither`. |
|
|
| Every representation uses the same 0.035 degree sky footprint and 256 x 256 |
| pixel grid from CDS HiPS2FITS. |
|
|
| ## Curation |
|
|
| The starting catalog contained 114 objects (36 streams, 38 shells, 40 neither). |
| After a randomized blind review, 12 ambiguous objects were dropped and four |
| objects were relabeled. The retained catalog is deduplicated at 10 arcsec. |
| `neither` is an operational hard-negative label from rejected high-ranking shell |
| semantic-search results; it is not proof of the physical absence of all tidal |
| structure. |
|
|
| Underlying imagery is from the DESI Legacy Imaging Surveys DR10 and remains |
| subject to its original data-use policy and acknowledgements. |
|
|
