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
360
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
180
Breaking Down Risk Parity Portfolios: A Practical Open Source Implementation
mirca
0
2k
PSF Photometry for Kepler and K2 Data
mirca
0
200
An Approximate Exponentiated Weibull Joint Envelope-Phase Distribution
mirca
0
110
Other Decks in Technology
See All in Technology
Firestore → Spanner 移行 を成功させた段階的移行プロセス
athug
1
420
La gouvernance territoriale des données grâce à la plateforme Terreze
bluehats
0
150
Terraformで構築する セルフサービス型データプラットフォーム / terraform-self-service-data-platform
pei0804
1
120
クラウドセキュリティを支える技術と運用の最前線 / Cutting-edge Technologies and Operations Supporting Cloud Security
yuj1osm
2
310
カミナシ社の『ID管理基盤』製品内製 - その意思決定背景と2年間の進化 #AWSUnicornDay / Kaminashi ID - The Big Whys
kaminashi
3
860
人工衛星のファームウェアをRustで書く理由
koba789
9
5.7k
シークレット管理だけじゃない!HashiCorp Vault でデータ暗号化をしよう / Beyond Secret Management! Let's Encrypt Data with HashiCorp Vault
nnstt1
3
230
Function Body Macros で、SwiftUI の View に Accessibility Identifier を自動付与する/Function Body Macros: Autogenerate accessibility identifiers for SwiftUI Views
miichan
2
170
「全員プロダクトマネージャー」を実現する、Cursorによる仕様検討の自動運転
applism118
8
2.2k
5分でカオスエンジニアリングを分かった気になろう
pandayumi
0
180
Flutterでキャッチしないエラーはどこに行く
taiju59
0
220
職種の壁を溶かして開発サイクルを高速に回す~情報透明性と職種越境から考えるAIフレンドリーな職種間連携~
daitasu
0
130
Featured
See All Featured
Producing Creativity
orderedlist
PRO
347
40k
I Don’t Have Time: Getting Over the Fear to Launch Your Podcast
jcasabona
33
2.4k
Optimising Largest Contentful Paint
csswizardry
37
3.4k
Principles of Awesome APIs and How to Build Them.
keavy
126
17k
The Web Performance Landscape in 2024 [PerfNow 2024]
tammyeverts
9
800
Product Roadmaps are Hard
iamctodd
PRO
54
11k
Building Adaptive Systems
keathley
43
2.7k
Creating an realtime collaboration tool: Agile Flush - .NET Oxford
marcduiker
31
2.2k
Automating Front-end Workflow
addyosmani
1370
200k
Reflections from 52 weeks, 52 projects
jeffersonlam
352
21k
Understanding Cognitive Biases in Performance Measurement
bluesmoon
29
1.9k
Fight the Zombie Pattern Library - RWD Summit 2016
marcelosomers
234
17k
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