VO Tools

A variety of Virtual Observatory (VO) services and tools exists through various VO projects across the globe. In this section, you can find VO-compatible applications, tools and data archives to do science. These are mostly web-form interface services and/or downloadable Java applications. For these to work Java Runtime Environment (JRE) should be installed on your computer. Please make sure that you are using right version of Java. If you don’t have Java or the right version installed, then either speak to your system administrator, or download it  from the Sun Java website. These VO  applications and tools are available in the sections below:

Please write to barway@saao.ac.za if:

  • links are broken
  • list is incomplete
  • you would like to have more information

Data Archives

VizieR provides access to the most complete library of published astronomical catalogues and data tables available on line. Query tools allow the user to select relevant data tables and to extract and format records matching given criteria. Web Service
Simbad Astronomical database which provides basic data, cross-identifications, bibliography and measurements for astronomical objects outside the solar system. Web Service
NED The NASA/IPAC Extragalactic Database (NED) provides a multi-wavelength fusion of data for millions of objects outside the Milky Way galaxy. Web Service
SDSS DR13 Sloan Digital Sky Survey – A major research project dedicated to producing a systematic map of a quarter of the sky, producing new catalogues for deep-sky. Web Service
2MASS Two Micron All Sky Survey (2MASS) – research project dedicated to producing a systematic map of the entire sky in near-infrared. Web Service
ESO data archive ESO observational data can be requested through this facility after the proprietary period by the astronomical community. Web Service
MAST The Multimission Archive at STScI is a project to support and provide to the astronomical community a variety of astronomical data archives, with the primary focus on scientifically related data sets in the optical, ultraviolet, and near-infrared parts of the spectrum.  Web Service
2dFGRS The 2dF Galaxy Redshift Survey (2dFGRS) is a spectroscopic survey and spectra is obtained for 245591 objects, mainly galaxies.  Web Service
HyperLeda The extragalactic database. Photometry, kinematics spectrophotometry, archive of fits data. Web Service
IPAC/IRSA data archive for scientific data sets from NASA’s infrared and sub-millimeter astronomy projects and missions.  Webservice
HLA The Hubble Legacy Archive (HLA) is designed to optimize science from the Hubble Space Telescope by providing online, enhanced Hubble products and advanced browsing capabilities.  Web Service

Data Discovery Tools

VOPlatform VOPlatform is a tool that provides users with an environment in which to place their frequently used VO tools and datasets, along with other resources such as documents, web links etc. The application has been developed in Java, and acts on data available in the VO Standard VOTable format. Download
VODesktop A desktop application for working with the Virtual Observatory. It can explore data resources, query remote catalogs, and construct workflows to automate tasks. Download
Datascope A Web Service for discovering and exploring data in the Virtual Observatory from archives and data centres around the world. Web Service
Aladin An interactive software sky atlas allowing the user to visualize digitized images of any part of the sky, to superimpose entries from astronomical catalogs. Web Service
SkyView A Virtual Observatory for generating images of any part of the sky at wavelengths in all regimes from Radio to Gamma-Ray. Web Service
VOEventNet VOEventNet enables rapid observations of the dynamic night sky. VOEventNet gathers streams of astronomical alerts and reports in a common format, so that both people and robotic systems can get the alerts quickly enough to respond with follow-up observations. Web Service

Analysis Tools

ARCHANGEL It allows astronomers to do surface photometry of galaxies. WebService Download
AstroStat It allows astronomers to use both simple and sophisticated statistical routines on large datasets. Web Service
Montage It allows astronomers to make mosaics from 2MASS, DPOSS, or SDSS images and returns science-grade mosaics that preserve fluxes and astrometry and rectify backgrounds to a common level. Web Service
Specview It is a tool for 1-D spectral visualization and analysis of astronomical spectra. Web Service
SPLAT A spectra analysis tool. Download
Euro3D It allows astronomers to deal with datasets in the Euro3D FITS format. Web Service
NVO Spectrum Services This service allows a large, distributed database of spatial object spectra and a collection of tools for common spectrum processing tasks. Web Service
Yafit An SED fitting tool. Although it could be used in other contexts, it is mainly intended for fitting observed photometric data to calculated model spectra. Download
GOSSIP A tool which allows astronomers to fit the electro-magnetic emission of an object (the SED, Spectral Energy Distribution) against synthetic models. Download
EZ (Easy-Z) A tool which allows to estimate redshifts for extragalactic objects. Download

Plotting Tools

Topcat An interactive graphical viewer and editor for tabular data. It understands a number of different astronomically important formats (including FITS and VOTable) and more formats can be added. Download
VOPlot A tool for visualizing astronomical data. VOPlot is available as a stand alone version, which is to be installed on the user’s machine, or as a web-based version fully integrated with the VizieR database. Download
VOMegaPlot It has been specifically optimized for handling large number of points (in the range of millions). It has the same look and feel as VOPlot and both these tools have certain common functionality. Download
STILTS It deals with the processing of tabular data; the package has been designed for, but is not restricted to, astronomical tables such as object catalogues. Download
VOConvert A tool for converting files from one format to another. It supports following file format conversions: (1) ASCII to VOTable (2) FITS to VOTable and (3) VOTable to ASCII. Download