The story, of this secret video about Hercolubus is the following:
Cristoforo Barbato, an Italian researcher, had written an important article about the Secrets of Fatima, focusing on the mystery of the untold Third Secret. Following this, he was contacted by someone who told him he was a Jesuit priest, working for the Vatican Intelligence Service (SIV), and who had important information to reveal. At first Barbato was skeptical, but the Jesuit was persistent; and eventually Barbato was able to substantiate all his claimed personal details. The Jesuit was exactly who he said he was.
At Barbato's insistence, they finally met in a public place in Rome in the year 2001. At that point the Jesuit gave Barbato a significant amount of information about the return of Hercolubus, which was being carefully tracked by the Vatican and others; and handed Barbato a two-minute videotape never publicly released, which the Jesuit said was Hercolubus filmed at close range from a classified Vatican-controlled space probe called Siloe.
About the acronym NSD42, the Federation of American Scientists (FAS) states:
"The NSC staff has determined that the release of the format of NSD 42 could cause damage to the national security."
The Vatican informer told Barbato the space probe Siloe was equipped with a sophisticated infrared camera and electromagnetic impulses propulsion, and was assembled in Area 51(Nevada), and then orbited by an aircraft of the type "Aurora", a secret hypersonic aircraft.
The space probe Siloe, always according the Barbato's contact, sent the images of the planetoid in October 1995 (after it came back to the border of Solar System to have more power of signal), to a secret radio telescope hidden in an unused oil-refining plant in Alaska, totally managed by some Jesuits belonging to the S.I.V.
The radio telescope, he added, was built in 1990 to observe anomalous celestial bodies on approaching the Solar System.
More info about the coming Doomsday and how to overcome it, in the book "Hercolubus or Red Planet" by V.M. Rabolu.