Coma Off It: Regularizing Variable Point-spread Functions

Hughes, J. Marcus; DeForest, Craig E.; Seaton, Daniel B.

doi:10.3847/1538-3881/acc578

i

Coma Off It: Regularizing Variable Point-spread Functions

2023
By Hughes, J. Marcus ; DeForest, Craig E. ; Seaton, Daniel B.
Source: The Astronomical Journal, 165(5), 204

Details

Journal Title:

The Astronomical Journal
Personal Author:

Hughes, J. Marcus ; DeForest, Craig E. ; Seaton, Daniel B.
NOAA Program & Office:

NESDIS (National Environmental Satellite, Data, and Information Service) ; NCEI (National Centers for Environmental Information)
Description:

We describe a rapid and direct method for regularizing, post facto, the point-spread function (PSF) of a telescope or other imaging instrument across its entire field of view (FOV). Imaging instruments in general blur point sources of light by local convolution with a PSF that varies slowly across the FOV, due to coma, spherical aberration, and similar effects. It is possible to regularize the PSF in post-processing, producing data with a homogeneous “effective PSF” across the entire FOV. In turn, the method enables seamless wide-field astronomical mosaics at higher resolution than would otherwise be achievable, and potentially changes the design trade space for telescopes, lenses, and other optical systems where data uniformity is important. For many kinds of optical aberration, simple and rapid convolution with a locally optimized “transfer PSF” produces extremely uniform imaging properties at low computational cost. PSF regularization does not require access to the instrument that obtained the data, and can be bootstrapped from existing data sets that include starfield images or other means of estimating the PSF across the field.
Subjects:
- Space and Planetary Science
- Astronomy and Astrophysics
Keywords:
- Space and Planetary Science
- Astronomy and Astrophysics
Source:

The Astronomical Journal, 165(5), 204
DOI:

https://doi.org/10.3847/1538-3881/acc578
ISSN:

0004-6256 ; 1538-3881
Format:

PDF
Publisher:

American Astronomical Society
Document Type:

Journal Article
License:

https://creativecommons.org/licenses/by/4.0/
Rights Information:

CC BY
Compliance:

Submitted
Download URL:

https://repository.library.noaa.gov/view/noaa/50617/noaa_50617_DS1.pdf
File Type:

[PDF - 737.16 KB]
Collection(s):

National Environmental Satellite and Data Information Service (NESDIS)
Main Document Checksum:

urn:sha256:859727506e0b97ba2ba4661fa1078b38391ca8d2b6dec39b409c3c52b2dabb6c

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