Alpha · actively developed · GPL-3.0
Galileo is a modern, open-source imaging application built on INDI and ASCOM Alpaca. One guided workflow for your cameras, mounts, focusers, plate solving and image library — from a Windows desktop to a Raspberry Pi.
Speaks the protocols and tools astrophotographers already use
Each card is labelled with where it really stands today. Galileo is alpha software, and we'd rather you know exactly what runs now.
Camera, mount, filter wheel, focuser, rotator, switches and power boxes (ports, dew heaters, readings), flat panel, weather, dome and safety monitor. Real device scans, Alpaca Management API discovery and .local mDNS names such as a Seestar's seestar.local.
Group several mounts into an Observatory. Each Pier holds one mount with one or more optical trains and cameras, selectable from the top bar and saved across restarts.
A pan-and-zoom auto-stretch preview with histogram and per-frame statistics — mean, median, min, max, star count and HFR. Live Stack registers and combines a run into one growing image as it is taken. A mount nudge pad (N/S/E/W) and portrait/landscape auto-layout are built in. The Flats Assistant includes a working Sky Flats capture mode that hunts the right exposure in twilight automatically.
Connect to PHD2 by host and port and watch it live: guide-star image, guide graph, drift and calibration plots, statistics and the event log — with Loop, Guide, Stop and Dither controls.
Follow a run live: the frame being measured, star count, HFR and FWHM, and the HFR V-curve with its fit and best position. Star detection uses SEP, and heavy fitting runs off the UI thread.
Capture & Solve with ASTAP, using the mount position as a hint — then sync, slew back until within your accuracy, or just report the error. Load & Slew solves any FITS file.
A planetarium for your site and time: stars, Messier, Caldwell and NGC objects, Sun, Moon and planets, constellation lines, and click-to-identify. Upload a horizon obstruction table and Galileo can refuse slews into it.
What's Up Tonight ranks catalog objects by Observability Score (altitude, Moon, weather) and Fit Score (aperture, FOV) for your active Pier. Targets is a full search-criteria panel. Framing Assistant shows a DSS survey image with your FOV rectangle, mosaic-aware, with rotator control when connected. Block-based Sessions authoring and a multi-day Schedule calendar are their own screens.
AstroFiler, built in: browse by object, group sessions, map FITS header values, find duplicates, merge objects and back up to Google Cloud Storage. Twelve command-line utilities cover scheduled and headless use.
Drag Target, Image, Filter Change, Autofocus, Plate Solve, Dither and more onto a Sessions card; right-click any block for its parameters; Save, template, Schedule or Run. A multi-day calendar plots the job queue over your Observatory almanac with Moon phase and twilight shading. The runtime execution engine — actually driving hardware through a session — is the next layer to build.
AAVSO target planning and photometric analysis — VSTarget merged in as pre-loaded first-party plugins, with targets submitted straight into the scheduler.
Layered safety monitoring — hardware sensors and software classifiers both arrive as ordinary Safety Monitor devices — plus a watchdog, automated meridian flips and a plugin manager. Plugins today: VSTarget, Kasa Switch, Generic Relay, WandererBox power boxes and AllSkyCam.
Pick a time, or follow the clock, and Galileo draws the sky from your Observatory's location. Your real horizon — trees, buildings, the roll-off roof — is shaded on the map, so you can see what's truly imageable.
Capture & Solve takes an exposure, solves it with ASTAP, and either syncs the mount, slews back until you're inside your accuracy target, or just tells you how far off you are. Every solve is listed with its error plotted, whichever part of Galileo started it.
Build a session by dragging blocks onto a card — Target, Image, Filter Change, Autofocus, Dither, Flat Capture and more. Right-click any block to set its parameters. Save as a template or schedule it immediately. The Schedule calendar lays every job over your Observatory almanac so you can see what fits.
A sidebar for each stage of the night, a context panel for its controls, and the Observatory, Pier, optics and camera always one click away. Click any screenshot to enlarge.
Galileo models the way an observatory is actually laid out, going beyond what EKOS supports: several independent mounts under one roof, each with its own sequencer, sharing what should be shared.
Name, latitude and longitude, timezone, address and owner. Shared resources — a roll-off roof or dome, safety monitors — can be scoped to the whole Observatory or to a single Pier.
Every Pier owns a mount and runs its own independent sequencer and scheduler. A fault on one Pier's device is isolated and doesn't take the others down.
A Pier carries one or more optical trains — tube, camera, filter wheel, focuser, rotator — with INDI and Alpaca devices freely mixed within the same setup.
Galileo's forum is GitHub Discussions — searchable, threaded, and one click from the code. It is also built into the app: open the speech-bubble button in the sidebar.
Setup, equipment, INDI or Alpaca drivers — if the built-in help (F1) and the wiki do not answer it, ask here.
Q&AShare your images and your observatory, and see what others are doing with Galileo.
Show & tellDescribe the problem you want solved and see whether others want it too.
IdeasSomething broken? Use the Community button in the app and the form arrives with your version and OS filled in.
Bug reportTalk to the developer and other Galileo users in real time on the Galileo Discord.
DiscordWhere do I ask? Start with the wiki and the app's built-in help; then Discussions for questions; use a bug report only for something that is broken.
Galileo is a labour of love, and it takes a great deal of time: planning features, fixing bugs, testing against real equipment, writing documentation and keeping up with the INDI and ASCOM Alpaca ecosystems. It is free, open source and has no ads or paywalls, but it has become harder to sustain without some financial help.
If Galileo has helped your imaging, please consider contributing. Thank you for being part of it!
Galileo's design is validated against the author's own observatory: a roll-off-roof shed with an INDI weather station and rain monitor, and three independent Piers — two smart scopes via ASCOM Alpaca and a 62 mm refractor on an OnStep mount via INDI.
Galileo