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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.
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