Euclid Data Explorer at IRSA: Overview
The Euclid Data Explorer at IRSA provides an interactive graphical user
interface (GUI) for specifying search constraints, submitting queries,
and visualizing the results of data released by Euclid 
.
Contents of page/chapter:
+Documentation
+Terminology, Hints, and Tips
+Side Menu and Adding to the Tabs Menu
+Side Menu and Appearance
+User Login Overview
+Getting More Help
A detailed Users Guide about the data available here can be found on
the Euclid Mission Page.
Euclid launched in July 2023 as a European Space Agency (ESA) mission
with involvement by the National Aeronautics and Space Administration
(NASA). The primary science goals of Euclid are to better understand
the composition and evolution of the dark Universe. The Euclid mission
will provide space-based imaging and spectroscopy as well as
supporting ground-based imaging to achieve these primary goals. These
data will be archived in multiple global repositories, including IRSA,
where they will support transformational work in many areas of
astrophysics.
During its nominal mission duration of 6 years, The Euclid space
telescope will conduct (1) a Wide Survey resulting in imaging and
spectroscopy over about 14,000 square degrees; and (2) a Deep Survey
covering about 50 square degrees that will be ~2 magnitudes deeper.
Euclid public data releases will occur approximately annually from
2025 through 2031.
The first release of Euclid data occurred in March 2025 and is known
as Euclid Quick Release 1 (Q1). It consists of data in four fields.
Although three Euclid Deep Fields are included, the data released in
Q1 is at the depth planned for the Wide Field Survey.
- Telescope & Data Terminology
-
The Euclid Space Telescope carries two instruments: the VISible
instrument (VIS) and the Near-Infrared Spectrometer and Photometer
(NISP). The Euclid data set will include data collected with these
space-based instruments as well as "external" (EXT) images collected
by ground-based telescopes and served alongside the Euclid images.
Euclid data products are processed and produced by different pipeline
Processing Functions (PF). This table summarizes these PFs, as they
can be useful for understanding the organization and names of the data
products. Please see the Users Guide (which can be found on the Euclid Mission Page) for more information.
| Euclid Processing Function | Brief
Description |
|---|
| LE1 | Produces Level 1 (raw) images from the VIS and NISP instruments |
| VIS | Produces calibrated Level 2 images from raw Level 1 VIS images |
| NIR | Produces calibrated Level 2 images from raw Level 1 NISP images |
| SIR | Produces calibrated Level 2 spectral images from the raw Level 1 NISP spectral data and extracts 1D spectra from the Level 2 spectral images |
| MER | Merges all Level 2 information to provide mosaics, catalogs, and photometric redshifts based on photometric and spectroscopic data |
| EXT | Provides external imaging and spectroscopic data |
| SPE | Measures spectroscopic redshifts from the Level 2 spectra |
| PHZ | Computes photometric redshifts from the multiwavelength imaging data |
| SHE | Measures shapes on the VIS imaging data (not included in Q1) |
| LE3 | Produces Level 3 data products |
| SIM | Produces simulated data (not included in Q1) |
- Tool Terminology
-
The words in blue rectangles at the top are 'tabs.'
This icon in the upper left 
pulls open a
"drawer" from the left hand side which enables you to add or remove tabs from this top level (see below). Most of these tabs allow searching. The side drawer also can allow
you to change the appearance (dark or light
mode) (see below).
When you have results loaded into the
Euclid Data Explorer, your browser window is divided into
"panes", like "window panes." The contents of the
panes depends on what you are doing with the tool, but could include
an image pane, at least one table pane, and/or a plot pane. You can
expand any of the window panes by clicking on the expand icon: 
Each of the three main kinds of 'panes' in the display has its own
toolbox in its upper right corner which operates on things in that
pane, and the basic functionality for each of these panes is covered
elsewhere in this document:
In the Euclid Data Explorer at IRSA, you can search by position, or Tile or
Object ID. Searching is in its
own section.
This icon in the upper left pulls open a
"drawer" from the left hand side; the top of it looks like this:
|
The highlighted bar ("Results" in this example) is the tab you have in
the foreground on your main window.
You can use this side menu to add (or remove) blue tabs from the top
of your Euclid Data Explorer at IRSA interface. By default, Results, Images,
Inspect Objects, Search by ID, and Euclid Catalogs are shown, along with the Job Monitor.
Under "More Searches," you have access to TAP
to search the worldwide Virtual Observatory (VO) for data,
IRSA catalogs to search IRSA
catalog holdings, VO SCS to perform a VO simple cone search, and NED Objects.
Click on the "Hide Tab" button to remove that corresponding tab.
|
This icon in the upper left pulls open a
"drawer" from the left hand side; the bottom of it looks like
this:
This controls the appearance of the tool in your browser -- do you
want it to run as light mode, dark mode, or respect whatever
preferences you have set on your system? Try out the different modes;
you may have a preference!
In the far upper right, there is a link to log in. The Euclid Data Explorer
at IRSA can remember you when you return. See the user registration section for more information.
The "Help" icon 
leads you into this
online help. There are also context-sensitive help markers throughout
the tools (
). You can also download a PDF
version of this manual; look at the top left of the help window. (The
PDF may be easier to search than the web pages; use your PDF reader's
search function.)
You can submit questions to the IRSA Help Desk .
A set of frequently asked questions (FAQs) about the Euclid Data Explorer at
IRSA is here.
The IRSA YouTube channel has lots of short videos about IRSA tools.
Found a bug? The known bugs and
issues in this version of the Euclid Data Explorer at IRSA are listed here . If
you think you have found a bug, before reporting it, please check this
list, and read this online Euclid Data Explorer help. It may be a
"feature" we already know about. If you have found a new, real bug,
then please do contact us via the IRSA Help Desk . Please include your operating system version and
your browser software and version. If you can, please also include
any specific error message you may have gotten. (NB: In our testing,
copying shortcuts worked on Windows and Linux; the command-C did not
always work on Macs, but selecting and clicking the right mouse button
often did when command-C did not.)
