It could have been be a thermal radiation from a comet (?), that entered FOV of the radio telescope... Perhaps I am just rambling nonsense here because I don't know the details of the observation (received signal level in particular).
There is no need to wait for that comet really - any comet at similar distance from us and the Sun, at similar temperature would do to test this thermal hypthesis.
Even calculation/simulation would be sufficient for the good indicative answer...
|