Table · dataset · 2024
Asteroids spin orientation and phase function
Listed in IVOA Registry (Virtual Observatory)
Large sky surveys provide numerous non-targeted observations of small bodies of the Solar System.
Description
The upcoming Legacy Survey of Space and Time (LSST) of the Vera C. Rubin observatory will be the largest source of small body photometry in the next decade. With non-coordinated epochs of observation, colors, and therefore taxonomy and composition, can only be computed by comparing absolute magnitudes obtained in each filter by solving the phase function (evolution of brightness of the small body against the solar phase angle).
Current models in use in the community (HG, HG12*, HG1G2) however fail to reproduce the long-term photometry of many targets due to the change in aspect angle between apparitions. We aim at deriving a generic yet simple phase function model accounting for the variable geometry of the small bodies over multiple apparitions. As a spinoff of the HG1 G2 model, we propose the sHG1 G2 phase function model in which we introduce a term describing the brightness changes due to spin orientation and polar oblateness.
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We apply this new model to 13245908 observations of 122675 SSOs. These observations were acquired in the g and r filters with the Zwicky Transient Facility between 2019/11/01 and 2023/12/01. We retrieve them and implement the new sHG1 G2 model in Fink, a broker of alerts designed for the LSST.
The sHG1 G2 model leads to smaller residuals than other phase function models, providing a better description of the photometry of asteroids. We determine the absolute magnitude H and phase function coefficients (G1, G2) in each filter, the spin orientation ({alpha}_0_ , {delta}_0_), and the polar-to-equatorial oblateness R for 95593 Solar System Objects (SSOs), which constitutes about a tenfold increase in the number of characterized objects compared to current census.
The application of the sHG1 G2 model on ZTF alert data using the FINK broker shows that the model is appropriate to extract physical properties of asteroids from multi-band and sparse photometry, such as the forthcoming LSST survey.
Links
Where it is published
- Reference page cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/687/A38 ↗
landing page · from IVOA Registry
Documentation and papers
- ADS 2024A&A...687A..38C ui.adsabs.harvard.edu/abs/2024A%26A...687A..38C ↗
publication · from IVOA Registry
Catalogue records · 2
- VOResource record dc.g-vo.org/oai.xml?verb=GetRecord&metadataPrefix=ivo_vor&identifier=ivo%3… ↗
metadata API · from IVOA Registry
- Registry record (GAVO) dc.g-vo.org/I/cds.vizier/j/a%2Ba/687/a38 ↗
catalogue entry · from IVOA Registry
Topics
- Stated by source
- Optical
- From keywords
- Astronomy & Astrophysics
Provenance · 1 source records, 8 field assertions
| Source | Key | Last seen | Raw |
|---|---|---|---|
| IVOA Registry (Virtual Observatory) | ivo://cds.vizier/j/a+a/687/a38 | 15 d ago | JSON v1 |
| Field | Assertion | Extractor | Evidence |
|---|---|---|---|
| access_level | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[field].local:field:astronomy | mapping · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| concepts[modality].ivoa_waveband:optical | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| description | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_description |
| license_text | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| publication_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 | |
| title | source · IVOA Registry | connector:ivoa_registry@1.0.0 | rr.resource.res_title |
| updated_date | source · IVOA Registry | connector:ivoa_registry@1.0.0 |