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Add, edit, or delete observer locations. Each location stores coordinates, timezone, and observing conditions.
A planning tool for astrophotographers - calculate seasonal visibility windows, transit times, sequence planning, and many more capabilities are available for thousands of deep sky targets. Most functions do not require the internet.
This application uses astronomical and display algorithms developed with assistance from Claude (Anthropic).
• Saguaro Astronomy Club (SAC) Deep Sky Database • OpenNGC database by Mattia Verga • Astronomical League Observing Program Division • Open Meteo open source weather forecast API • Gnu Emacs. It's not an editor, it's a lifestyle.
I welcome your feedback and suggestions. Please email me at feedback@astryx.tools.
Astryx stores all data locally in your browser. This software is provided as-is, without warranty of any kind, express or implied. The developer assumes no responsibility for data loss, damages, or any other liability arising from the use of this software or software failure. Back up your data regularly.
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Select telescope and sensor to calculate field of view.
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Calculates best observing month and visibility window for all targets viewable from the specified location. The scoring is based on type-specific weighted scoring of sky position, integration time, and altitude. High transit weight for stars, dark nebulae, galaxies. These targets benefit most from being high in the sky. Position matters more than total time. Balanced weights for bright nebulae, SNRs. These extended objects benefit from both good positioning and longer integration time. Lower altitude thresholds for bright nebulae. Brighter objects can be imaged at lower altitudes where atmospheric extinction is greater.For additional information, see the help page.
Generate plan to configure targets
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All your Astryx data — locations, equipment, imaging projects, sessions, programs, your To Do List, and pinned targets — is stored exclusively in your browser's local IndexedDB storage. Nothing is stored on any server.
This means if your browser data is cleared, your device is lost or fails, or you switch browsers, your data is gone. Regular backups to redundant or cloud storage are essential.
Recommended backup strategy:
1. Back up the Target Database once — it rarely changes and is large. Store it somewhere safe.
2. Back up everything else regularly — after every imaging session or at least weekly. Store these backups in cloud storage or on a separate device.
Backups are compressed ZIP files you can restore at any time from the Backup & Restore function in the system menu.
Graph visualization: Shows peak target altitude during astronomical darkness throughout the year. Background gradient shows observability score for each day based on transit timing (how close to midnight) and dark hours available (total time above type-specific threshold). Darker shading indicates better observing conditions.
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