Feritas (1983) Summary

This paper discusses the possibility of detecting Bracewell probes in the Earth and Moon vicinity.

The author begins by classifying the probes into three categories: class one, objects intended to be found, class two, objects intended not to be found and class three, objects for which detection is not important or relevant. Since we have not detected any probes yet, it is likely we will not detect any class one or class two objects. Therefore, the author argues that the only observable objects will be class 3 objects.

Further, the author argues the sizes of those probes to be 1 to 10 m, taking into account 1) the long-duration of exploration 2) capability of withstanding meteoroid 3) radiation pressure 4) capability of returning information.

Next, the author discusses the search space in geocentric orbits, selenocentric orbits, Earth-Moon libration orbits, and Earth-Moon halo orbits. In each of the orbits, the author discusses the size of the search space and also the search speed.

Finally, the author argues that it is possible to detect such probes in a SETI program which extends for 2 years both from the space or ground. Additionally, the author also points out the possibility of detecting those probes in radio and infrared band.

The reason this paper is important is because this is the first time people have tried quantitatively to define where to search for Bracewell probes near the Earth and Moon.