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/p...
Search
Zé Vinícius
May 07, 2017
Technology
0
250
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
160
Breaking Down Risk Parity Portfolios: A Practical Open Source Implementation
mirca
0
1.8k
PSF Photometry for Kepler and K2 Data
mirca
0
180
An Approximate Exponentiated Weibull Joint Envelope-Phase Distribution
mirca
0
98
Other Decks in Technology
See All in Technology
Making your applications cross-environment - OSCG 2024 NA
salaboy
0
180
いざ、BSC討伐の旅
nikinusu
2
780
Shopifyアプリ開発における Shopifyの機能活用
sonatard
4
250
適材適所の技術選定 〜GraphQL・REST API・tRPC〜 / Optimal Technology Selection
kakehashi
1
170
SSMRunbook作成の勘所_20241120
koichiotomo
2
130
AWS Lambdaと歩んだ“サーバーレス”と今後 #lambda_10years
yoshidashingo
1
170
rootlessコンテナのすゝめ - 研究室サーバーでもできる安全なコンテナ管理
kitsuya0828
3
380
フルカイテン株式会社 採用資料
fullkaiten
0
40k
10XにおけるData Contractの導入について: Data Contract事例共有会
10xinc
6
620
SREが投資するAIOps ~ペアーズにおけるLLM for Developerへの取り組み~
takumiogawa
1
180
ドメインの本質を掴む / Get the essence of the domain
sinsoku
2
150
安心してください、日本語使えますよ―Ubuntu日本語Remix提供休止に寄せて― 2024-11-17
nobutomurata
1
990
Featured
See All Featured
Agile that works and the tools we love
rasmusluckow
327
21k
Designing the Hi-DPI Web
ddemaree
280
34k
It's Worth the Effort
3n
183
27k
The Cult of Friendly URLs
andyhume
78
6k
Designing for Performance
lara
604
68k
Done Done
chrislema
181
16k
The Psychology of Web Performance [Beyond Tellerrand 2023]
tammyeverts
44
2.2k
The MySQL Ecosystem @ GitHub 2015
samlambert
250
12k
Art, The Web, and Tiny UX
lynnandtonic
297
20k
YesSQL, Process and Tooling at Scale
rocio
169
14k
RailsConf 2023
tenderlove
29
900
Put a Button on it: Removing Barriers to Going Fast.
kastner
59
3.5k
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