ska: a Spectral Kit for Asteroids

A python client to explore the filters in SVO Filter Service (Rodrigo & Solano, 2020) and compute colors from spectra.

Easy handling of filters

What is the wavelength of VISTA.Ks filter? What is its FWHM?

Show me the transmission curve of Gaia/RP

How do I find the identifier of a filter?

Easy computation of colors

What is the color of the Sun?

What is the V-J of my spectrum?

How to specify the photometric system: AB, Vega, ST?

Contents

• Home
• Getting Started
  • Install ska
  • Manage ska cache
• Dealing with filters
  • Filter Information
  • Plotting transmission curves
  • Searching among filters
• Handling spectra
  • Spectrum from local data
  • Spectrum from templates
• Computing colors
  • Computing the colors of the Sun
  • Computing colors from spectra
  • Computing colors from reflectance
  • Switching between photometric systems
• How does it work?
  • Quantity of energy
  • The Vega system
  • The ST system
  • The AB system
  • Units of spectral flux
• API
  • Filters
  • Spectrum
  • SVO Tools
• Release notes
  • Release 2.2 – 2026-06-01
  • Release 2.1 – 2026-02-12
  • Release 2.0 – 2024-12-02
  • Release 1.3 – 2024-11-30
• Glossary