AAG CloudWatcher – Sky Monitoring for Remote Observatories

The AAG CloudWatcher is one of the most trusted cloud detection systems in astronomy, providing real-time monitoring of sky conditions to protect your equipment and automate your observatory.

Designed for both amateur and professional setups, the CloudWatcher continuously measures cloud cover, rain, sky brightness, temperature, and environmental conditions — making it ideal for fully remote or unattended operation.

Key Features

• ✔ Accurate cloud detection using infrared sky temperature measurement
• ✔ Integrated rain sensor with automatic heating for reliable readings
• ✔ Measures sky brightness (MPSAS) – ideal for astrophotography conditions
• ✔ Ambient temperature, humidity, and pressure monitoring (RH/AP version)
• ✔ Optional wind speed monitoring via external anemometer
• ✔ Relay output for automatic observatory closure
• ✔ Compatible with SOLO for fully autonomous operation

Designed for Real Observatories

The CloudWatcher has been in use worldwide since 2008, trusted in both private and institutional observatories. Its configurable thresholds allow you to fine-tune detection sensitivity for your specific location and climate.

Data is displayed in clear graphical form, making it easy to interpret conditions at a glance or integrate into automated workflows.

Software & Compatibility

• ✔ Windows software (included)
• ✔ ASCOM safety monitor & observing conditions drivers
• ✔ INDI / INDIGO support (Linux / Raspberry Pi setups)
• ✔ macOS support via third-party app
• ✔ Compatible with Sequence Generator Pro, ACP, Prism, CCDCommander and more

What’s Included

• ✔ CloudWatcher sensor unit
• ✔ Integrated cloud, rain, light, and temperature sensors
• ✔ Weatherproof IP68 cabling (various lengths available)
• ✔ Relay output for dome/roof automation

Technical Overview

• Power: 12–15V
• Current: < 1A
• Connection: RS232 (USB adapter required)
• Weight: 180g–205g
• IP-rated weatherproof connectors

Need help integrating the CloudWatcher into your observatory setup? We can advise on compatibility with control systems, automation software, and remote operation.

Frequently Asked Questions

What does the AAG CloudWatcher measure?

The CloudWatcher monitors cloud cover, rain, sky brightness (MPSAS), temperature, and optionally humidity, pressure, and wind speed. It provides a complete picture of sky and environmental conditions for observatory safety.

Can the CloudWatcher automatically close my observatory?

Yes. The built-in relay output can be used to trigger roof or dome closure when unsafe conditions are detected. It is commonly integrated with observatory control systems.

Is the CloudWatcher suitable for remote or unattended setups?

Yes. It is specifically designed for remote observatories and can operate continuously, especially when paired with systems like the SOLO for 24/7 autonomous monitoring.

Does it work with ASCOM and INDI?

Yes. The CloudWatcher supports ASCOM drivers for Windows and is compatible with INDI and INDIGO for Linux and Raspberry Pi-based systems.

What is the difference between the Standard and RH/AP versions?

The RH/AP version includes additional sensors for relative humidity and atmospheric pressure, allowing more advanced environmental monitoring and dew point calculations.

Does it require a computer to run?

It can be connected to a computer via RS232 (USB adapter required), or used autonomously when paired with compatible controllers such as the SOLO.

Can I adjust sensitivity for my location?

Yes. The CloudWatcher allows user-defined thresholds, so you can fine-tune cloud and weather detection based on your local climate conditions.

What cable lengths are available?

Multiple cable lengths are available (3m, 5m, 7m, 10m), and a no-cable option is also offered for custom installations.