README.md

---
license: cc-by-4.0
task_categories:
- image-to-image
tags:
- astronomy
- supernovae
- panstarrs
- delight
size_categories:
- 1K<n<10K
---

## Description

This is the dataset from DELIGHT [1], a model that locates the host galaxy of a
transient from multi-resolution images. The difference with the original is that
the images are **not** the cutouts used in the paper: they were regenerated from
[hips2fits](https://alasky.cds.unistra.fr/hips-image-services/hips2fits)
(PanSTARRS DR1 HiPS, served by CDS).

It contains **7,350 objects**, meant for training and validation. The `fold`
column carries a ready-made 5-fold cross-validation split, so the same file
covers both roles. Held-out evaluation is kept in a separate dataset,
[h2f_delight_test](https://huggingface.co/datasets/PRISM-Astro/h2f_delight_test),
which shares no host galaxy with this one.

Every cutout is centered on the **real supernova position**, and the `host_pos`
label is the offset from there to the host galaxy.

This split **includes Sérsic metadata** extracted from CasJobs (PanSTARRS DR1).
The `rSer*` columns are populated for every object, which makes it possible to
sample synthetic transient positions from the galaxy light profile.
## Image format

`image` has shape `(5, 5, 30, 30)`, which maps to
`(resolution levels, photometric bands, height, width)`

## Columns

<div style="font-family:-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,sans-serif;max-width:1000px;margin:0 auto;padding:16px 0">
<table style="width:100%;border-collapse:collapse;font-size:13px">
<thead><tr>
<th style="padding:10px 7px;text-align:left;font-weight:600;border-bottom:2px solid #4a6fb5;color:#4a6fb5;font-size:14px;width:18%">Column</th>
<th style="padding:10px 7px;text-align:left;font-weight:500;border-bottom:2px solid #4a6fb5;color:#4a6fb5;font-size:14px;width:20%">Type</th>
<th style="padding:10px 7px;text-align:left;font-weight:500;border-bottom:2px solid #4a6fb5;color:#4a6fb5;font-size:14px">Description</th>
</tr></thead>
<tbody>

<tr><td colspan="3" style="padding:8px 12px;font-weight:600;color:#4a6fb5;border-bottom:1px solid rgba(74,111,181,0.25);background:rgba(74,111,181,0.12)">Image and label</td></tr>
<tr>
<td style="padding:7px 7px;padding-left:20px;border-bottom:1px solid rgba(128,128,128,0.15)"><code>image</code></td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)"><code>(5,5,30,30)</code> float32</td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">Multi-resolution PanSTARRS cutout, centered on the supernova.</td>
</tr>
<tr>
<td style="padding:7px 7px;padding-left:20px;border-bottom:1px solid rgba(128,128,128,0.15)"><code>host_pos</code></td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">float32 &times; 2</td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">Offset <code>[dx, dy]</code> from the supernova to the host galaxy, in level-0 pixels.</td>
</tr>

<tr><td colspan="3" style="padding:8px 12px;font-weight:600;color:#4a6fb5;border-bottom:1px solid rgba(74,111,181,0.25);background:rgba(74,111,181,0.12)">Identification</td></tr>
<tr>
<td style="padding:7px 7px;padding-left:20px;border-bottom:1px solid rgba(128,128,128,0.15)"><code>oid</code></td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">string</td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">Transient identifier (ZTF, or IAU name for historical supernovae).</td>
</tr>
<tr>
<td style="padding:7px 7px;padding-left:20px;border-bottom:1px solid rgba(128,128,128,0.15)"><code>host_name</code></td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">string</td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">Catalog name of the host galaxy.</td>
</tr>

<tr><td colspan="3" style="padding:8px 12px;font-weight:600;color:#4a6fb5;border-bottom:1px solid rgba(74,111,181,0.25);background:rgba(74,111,181,0.12)">Host galaxy</td></tr>
<tr>
<td style="padding:7px 7px;padding-left:20px;border-bottom:1px solid rgba(128,128,128,0.15)"><code>host_redshift</code></td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">float64</td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">Redshift of the host; <code>NaN</code> when unknown.</td>
</tr>
<tr>
<td style="padding:7px 7px;padding-left:20px;border-bottom:1px solid rgba(128,128,128,0.15)"><code>hostsize</code></td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">float64</td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">Angular size of the host galaxy from the catalog.</td>
</tr>
<tr>
<td style="padding:7px 7px;padding-left:20px;border-bottom:1px solid rgba(128,128,128,0.15)"><code>host_ra</code></td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">float64</td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">Right ascension of the host, in degrees.</td>
</tr>
<tr>
<td style="padding:7px 7px;padding-left:20px;border-bottom:1px solid rgba(128,128,128,0.15)"><code>host_dec</code></td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">float64</td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">Declination of the host, in degrees.</td>
</tr>

<tr><td colspan="3" style="padding:8px 12px;font-weight:600;color:#4a6fb5;border-bottom:1px solid rgba(74,111,181,0.25);background:rgba(74,111,181,0.12)">Transient position</td></tr>
<tr>
<td style="padding:7px 7px;padding-left:20px;border-bottom:1px solid rgba(128,128,128,0.15)"><code>meanra</code></td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">float64</td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">Mean right ascension of the transient, in degrees. This is the center of the cutout.</td>
</tr>
<tr>
<td style="padding:7px 7px;padding-left:20px;border-bottom:1px solid rgba(128,128,128,0.15)"><code>meandec</code></td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">float64</td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">Mean declination of the transient, in degrees. This is the center of the cutout.</td>
</tr>
<tr>
<td style="padding:7px 7px;padding-left:20px;border-bottom:1px solid rgba(128,128,128,0.15)"><code>sn_ra</code></td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">float64</td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">Right ascension of the supernova, in degrees.</td>
</tr>
<tr>
<td style="padding:7px 7px;padding-left:20px;border-bottom:1px solid rgba(128,128,128,0.15)"><code>sn_dec</code></td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">float64</td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">Declination of the supernova, in degrees.</td>
</tr>

<tr><td colspan="3" style="padding:8px 12px;font-weight:600;color:#4a6fb5;border-bottom:1px solid rgba(74,111,181,0.25);background:rgba(74,111,181,0.12)">S&eacute;rsic fit &mdash; r band, from CasJobs</td></tr>
<tr>
<td style="padding:7px 7px;padding-left:20px;border-bottom:1px solid rgba(128,128,128,0.15)"><code>rSerRadius</code></td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">float64</td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">Effective radius Re of the r-band S&eacute;rsic fit, in arcsec.</td>
</tr>
<tr>
<td style="padding:7px 7px;padding-left:20px;border-bottom:1px solid rgba(128,128,128,0.15)"><code>rSerMag</code></td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">float64</td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">Magnitude of the r-band S&eacute;rsic fit.</td>
</tr>
<tr>
<td style="padding:7px 7px;padding-left:20px;border-bottom:1px solid rgba(128,128,128,0.15)"><code>rSerAb</code></td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">float64</td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">Axis ratio b/a of the fitted ellipse, between 0 and 1.</td>
</tr>
<tr>
<td style="padding:7px 7px;padding-left:20px;border-bottom:1px solid rgba(128,128,128,0.15)"><code>rSerPhi</code></td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">float64</td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">Position angle of the fitted ellipse, in degrees.</td>
</tr>
<tr>
<td style="padding:7px 7px;padding-left:20px;border-bottom:1px solid rgba(128,128,128,0.15)"><code>rSerRa</code></td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">float64</td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">Right ascension of the S&eacute;rsic fit center, in degrees.</td>
</tr>
<tr>
<td style="padding:7px 7px;padding-left:20px;border-bottom:1px solid rgba(128,128,128,0.15)"><code>rSerDec</code></td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">float64</td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">Declination of the S&eacute;rsic fit center, in degrees.</td>
</tr>
<tr><td colspan="3" style="padding:8px 12px;font-weight:600;color:#4a6fb5;border-bottom:1px solid rgba(74,111,181,0.25);background:rgba(74,111,181,0.12)">Cross-validation</td></tr>
<tr>
<td style="padding:7px 7px;padding-left:20px;border-bottom:1px solid rgba(128,128,128,0.15)"><code>fold</code></td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">int64</td>
<td style="padding:7px 7px;border-bottom:1px solid rgba(128,128,128,0.15)">Assigned cross-validation fold, from 1 to 5.</td>
</tr>

</tbody>
</table>
</div>


## References

[1] Förster, F., Muñoz Arancibia, A. M., Reyes-Jainaga, I., et al. 2022,
*DELIGHT: Deep Learning Identification of Galaxy Hosts of Transients using
Multiresolution Images*, The Astronomical Journal, 164, 195.
[doi:10.3847/1538-3881/ac912a](https://doi.org/10.3847/1538-3881/ac912a)

```bibtex
@article{Förster_2022,
  doi = {10.3847/1538-3881/ac912a},
  url = {https://doi.org/10.3847/1538-3881/ac912a},
  year = {2022},
  month = {oct},
  publisher = {The American Astronomical Society},
  volume = {164},
  number = {5},
  pages = {195},
  author = {Förster, Francisco and Muñoz Arancibia, Alejandra M. and Reyes-Jainaga, Ignacio and Gagliano, Alexander and Britt, Dylan and Cuellar-Carrillo, Sara and Figueroa-Tapia, Felipe and Polzin, Ava and Yousef, Yara and Arredondo, Javier and Rodríguez-Mancini, Diego and Correa-Orellana, Javier and Bayo, Amelia and Bauer, Franz E. and Catelan, Márcio and Cabrera-Vives, Guillermo and Dastidar, Raya and Estévez, Pablo A. and Pignata, Giuliano and Hernández-García, Lorena and Huijse, Pablo and Reyes, Esteban and Sánchez-Sáez, Paula and Ramírez, Mauricio and Grandón, Daniela and Pineda-García, Jonathan and Chabour-Barra, Francisca and Silva-Farfán, Javier},
  title = {DELIGHT: Deep Learning Identification of Galaxy Hosts of Transients using Multiresolution Images},
  journal = {The Astronomical Journal},
}
```