Each system contains seven highly sensitive NetSurveillance NVT cameras with the SONY STARVIS IMX291 CMOS Sensor and a 4 mm f/1.0 lens. Five of them are horizonally oriented at an altitude of about 25°, camera six and seven point in northern and southern direction at an altitude of about 70° All together they cover the full sky down to the horizon.
Each camera has a field of view of about 45x80°. The cameras are recording at 25 fps and reach a limiting magnitude of about 4 mag. Maximum resolution is 25 pixel/°.
Beside the cameras, the dome contains a power supply and an ethernet switch for each camera. Each camera has a black paper baffle. The dome is painted from the inside with two color layers - silver outside and pale black inside. That reduces internal reflections and the thermal influx.
Power is supplied via Power-over-Ethernet (PoE), so that the whole system needs just one CAT-6 Ethernet cable to connect it to base computer. The computer is a barebone Mini PC running Ubuntu and the AllSky7 software by Mike Hankey, which is continuously improved. Each camera provides an SD (640x480 pixel) and HD (1920x1080 pixel) video stream which are recorded by the Mini PC and analysed asynchronously.
The camera is recording meteors and fireballs 24/7, but at the moment only the nighttime recordings are automatically analysed. About 5.000 meteors are recorded per year under typical central European conditions.
The software provided by Mike Hankey covers all aspects of the measurement of fireballs. It allows to sort out false detections from the daily meteor stack, to measure the position of fireballs in single video frames, to identify reference stars and do the astrometry and photometry of the recording, and to combine the observation with data from other camera stations to calculate trajectories and orbits. All these functions are shown in a short advertising film.
The AllSky7 Fireball Network is a loose consortium of owners of AllSky7 fireball cameras with the purpose of
The camera network has a charitable character and does not follow commercial interests.
The recordings and data of the camera network can be downloaded and used in accordance to the purpose of the network. That includes:
In spite of the granted permissions, the copyright remains with the camera owner. Every use requires that the AllSky7 Fireball Network, the name of the camera owner and the copyright is mentioned.
Scientific publications have to contain the following sentence in their acknowledgements:
All [Part of] the work presented here is based on data of the AllSky7 camera network. The authors thank the network operators for making their data available.As reference, you may use the Meteoroids 2020 paper of Mike Hankey.
If individual recordings or data are published, they have to contain the copyright note (incl. link):
Copyright: <camera owner>, AllSky7 Fireball Network.