Upgrade to Pro
— share decks privately, control downloads, hide ads and more …
Speaker Deck
Features
Speaker Deck
PRO
Sign in
Sign up for free
Search
Search
Point spread function photometry with astropy/photutils
Search
Zé Vinícius
May 07, 2017
Technology
0
210
Point spread function photometry with astropy/photutils
Lightning talk at PyAstro 2017
Zé Vinícius
May 07, 2017
Tweet
Share
More Decks by Zé Vinícius
See All by Zé Vinícius
admm
mirca
0
130
Breaking Down Risk Parity Portfolios: A Practical Open Source Implementation
mirca
0
1.5k
PSF Photometry for Kepler and K2 Data
mirca
0
180
An Approximate Exponentiated Weibull Joint Envelope-Phase Distribution
mirca
0
90
Other Decks in Technology
See All in Technology
ServiceNow Knowledge 24の歩き方 EYストラテジー・アンド・コンサルティング
manarobot
0
210
The AI Revolution Will Not Be Monopolized: Behind the scenes
inesmontani
PRO
1
140
JSON攻略法.pdf
miyakemito
8
5.2k
.NET Profiler in 2024.
kkamegawa
2
450
Microsoft for Startups Founders Hub_20240429 update
daikikanemitsu
1
2.2k
MixIT 2024 - Pulumi : Gérer son infra avec son langage de programmation préféré
ju_hnny5
1
110
サーバー間 GraphQL と webmock-graphql の話 / server-to-server graphql and webmock-graphql
qsona
3
200
非同期推論システムによるコスト削減と信頼性向上
koki_nishihara
0
290
エンジニア候補者向け資料2024.04.24.pdf
macloud
0
3.3k
Azure犬駆動開発の記録/GlobalAzureFukuoka2024_20240420
nina01
1
230
KubeConにproposalを送りたい人へのアドバイス
sat
PRO
3
260
One engineer company with Ruby on Rails
rstankov
2
360
Featured
See All Featured
The Art of Programming - Codeland 2020
erikaheidi
43
12k
Building Applications with DynamoDB
mza
88
5.6k
XXLCSS - How to scale CSS and keep your sanity
sugarenia
242
1.2M
Side Projects
sachag
451
41k
KATA
mclloyd
16
12k
Designing Experiences People Love
moore
136
23k
The MySQL Ecosystem @ GitHub 2015
samlambert
244
12k
A Modern Web Designer's Workflow
chriscoyier
689
190k
Designing the Hi-DPI Web
ddemaree
276
33k
ParisWeb 2013: Learning to Love: Crash Course in Emotional UX Design
dotmariusz
104
6.6k
Bootstrapping a Software Product
garrettdimon
PRO
302
110k
We Have a Design System, Now What?
morganepeng
44
6.8k
Transcript
Point Spread Function Photometry with astropy/photutils: a Google Summer of
Code project Z´ e Vin´ ıcius mirca.github.io Lorentz Center, Leiden May 10, 2017
• Google Summer of Code 1
• Google Summer of Code • astropy/photutils 1
Google Summer of Code 2
Google Summer of Code • Project Idea: PSF photometry for
fitting overlapping sources simultaneously 2
Google Summer of Code • Project Idea: PSF photometry for
fitting overlapping sources simultaneously • Astropy Mentors 2
Google Summer of Code • Project Idea: PSF photometry for
fitting overlapping sources simultaneously • Astropy Mentors • Student 2
DAOPHOT-like PSF Photometry of a Single Star • Data: Z
= znm, n = 1, 2, ..., N, m = 1, 2, ..., M • Parameters: θ = (x0, y0, F) • Model: g(x, y, θ) • Objective: θ = arg min θ∈Θ n,m (znm − g(n, m, θ))2 3
DAOPHOT-like PSF Photometry of Multiple Overlapping Stars • Data: Z
= znm, n = 1, 2, ..., N, m = 1, 2, ..., M • Parameters: θ(1) = x(1) 0 , y(1) 0 , F(1) θ(2) = x(2) 0 , y(2) 0 , F(2) ... θ(K) = x(K) 0 , y(K) 0 , F(K) • Model: g x, y, θ(k) • Objective: θ = arg min θ∈Θ n,m znm − k g n, m, θ(k) 2 4
DAOPHOT-like PSF Photometry stars = find(image) while len(stars) > 0:
groups = group(stars) fitted_groups = fit(groups, model) residual = subtract(image, fitted_groups) stars = find(residual) basic_phot = BasicPSFPhotometry(...) itr_phot = IterativelySubtractedPSFPhotometry(...) daophot = DAOPhotPSFPhotometry(...) results = daophot(image) 5
DAOPHOT-like PSF Photometry 0 10 20 30 40 50 60
0 10 20 30 40 50 60 6
DAOPHOT-like PSF Photometry 0 10 20 30 40 50 60
0 10 20 30 40 50 60 7
astropy/photutils 8