A LEGENDARY "alien satellite", that is said to have orbited Earth for nearly 13,000 years, has been TWICE caught on camera passing the International Space Station (ISS) and the Moon, UFO hunters claim.

Footage which could show the mysterious Black Knight satellite passing the ISS emerged on YouTube following an earlier photograph, which appeared to show it pass the Moon, during July 31's Blue Moon (two full moons in the same month) event, according to alien researchers.

Now a separate clip has emerged said to have been taken on July 31 by another person, which appears to show the object passing the moon on video.

Sarah Roth, from the US, posted a link on this story to a YouTube video she uploaded of the sighting filmed from an undisclosed location.

She posted with the video: "Last night while taking pictures and video of the Blue Moon, a black object went hurling past. Could be any number of things from space debris, Black Knight satellite to UFO."

The Black Knight satellite is the name that has been given to a object captured on camera by Nasa astronauts during a 1998 space shuttle mission.

There are alien conspiracy theorists who claim the satellite is an object of extraterrestrial origin, possibly up to 13,000 years old orbiting Earth in near-polar orbit. 

Now YouTube UFO channel - Mister Enigma - has posted a video entitled "Black Knight Satellite Seen Right In Front Of ISS Camera."

It purports to be a recording taken from the Nasa ISS camera and shows a strange object floating seemingly at the same speed as the space station for about six minutes before slowly fading away.

One posted: "Very strange activity and it does look a bit like the Black Knight satellite."

Another added: "Very interesting, you can see the lights on the hull of the craft change colours especially early in the footage."

However, Mr Enigma, a channel run by Robert Simmons, based in Wisconsin, USA, has been accused before of posting hoax UFO footage in the past. 

Several claims were made that another video released by Mister Enigma, of a UFO appearing to pass a tree, was a CGI hoax, after the tree was found to have been made by repeatedly using the same section of a real tree.

He has denied hoaxing his videos.

Mister Enigma's new Black Knight video followed the posting on a US UFO sighting website of a photograph of the Moon taken during the Blue Moon event of July 31.

It shows an odd-shaped object which viewers have also suggested looks like the Black Knight Satellite.

The unnamed witness who posted the picture, said: "I was taking pictures the night of the blue moon in West Covina, California, somewhere between two and 4am, I noticed the triangular object when I was checking my pics the next day.

The legend of the alien satellite seems to have retrospectively started in 1899 when Nicola Tesla announced he was picking up radio waves coming from space, prompting people to suggest something alien was out there.

Experiments in 1928 in Oslow, Norway, picked up the same signals.

In 1954, US state newspapers carried quotes from Donald Keyhoe, a retired naval aviation major and UFO researcher, claiming the US Air Force had detected two satellites orbiting Earth, despite none yet being launched from our planet.

Time then ran a 1960 piece, following the launch of satellites from Earth, stating that the US Navy detected a dark object, possibly a Soviet spy satellite, with a highly irregular orbit.

The myth developed in 1963 when NASA astronaut Gordon Cooper was reported as saying he had seen the Black Knight Satellite while in space, but there was a media blackout upon his return and the US space agency allegedly put it down to cosmic hallucinations.

It has been reported that a decade later in 1973, a researcher from Scotland, Duncan Lunan, looked back at the Norwegian scientists' data from 1928, before claiming the "messages" suggested the Black Knight was sent by aliens from Epsilon Boötis, as a welcome message to Earth 12,600 years ago.

In 1998, the first alleged photographs of the satellite emerged and were taken by astronauts on the space shuttle Endeavor, as it made its first flight to the ISS.

However, many sceptics claim the legend was retrospectively created after the 1998 pictures emerged, with the preceding odd events weaved into the story to make it more convincing.

The noises from 1899 and 1928 remain a mystery, but the possible causes do not so far include an alien satellite, according to scientists. 

They insist research shows that in 1954 Mr Keyhoe had been promoting a UFO book and the articles had been written in a tongue-in-cheek fashion by the papers.

A follow-up, but less widely read, article in Time also confirmed that the strange satellite had in fact beenthe remains of an Air Force Discoverer satellite that had gone astray, they found.

There are reports that Mr Cooper, although maintaining he saw a number of UFOs in space, never claimed to have seen the Black Knight satellite on that mission or at all.

Yet David Bryant, a UK astronomer and Ufologist, said he had discussed the Black Knight with several Nasa astronauts and one assured him: "It's a satellite, we just don't know where it came from."

And Mr Lunan is also later reported to have denied suggesting any alien satellite had its origins 12,600 years ago and that his conclusion that the noises were a star map were from unscientific methods.

Nasa has since explained the 1998 images as being a thermal blanket lost by the shuttle crew.

This “Artificial Satellite” has caused mayor media interest since the late 50′s, and it has become one of the most talked about objects in space. First thought to be an Russian spy satellite, the Black Knight has gripped the interest of millions worldwide.

If you find our article about the Black Knight too long, here are some interesting facts about this mysterious Satellite:

1. According to monitoring agencies around the world, The Black knight has been transmitting radio signals for over 50 years now
2. The USA and Soviet Union have shown particular interest in this “unidentified space object”
3. Rumors are that it was Nikola Tesla the first man to “intercept” a signal from this otherworldly satellite in 1899 after building a high-voltage radio device in Colorado Springs.
4. Since the 1930′s Astronomers worldwide have been reporting strange radio signals which allegedly come from the “Black Knight”.
5. In 1957, Dr. Luis Corralos of the Communications Ministry in Venezuela photographed it while taking pictures of Sputnik II as it passed over Caracas.
6. The story of the Black Knight made its media debut in the 1940′s when the St. Louis Dispatch and The San Francisco Examiner wrote about the “Satellite” on May 14th 1954.
7. The Time Magazine wrote about it on the seventh of March, 1960.
8. In 1957, an unknown “object” was seen “shadowing”  the Sputnik 1 Spacecraft. According to reports, the “unidentified object” was in Polar orbit.
9. in 1957. The United Stated nor the Russians possessed the technology to maintain a spacecraft in Polar Orbit.
10. The first Polar orbiting satellite was launched in 1960.
11. Polar orbits are often used for earth-mapping, earth observation, capturing the earth as time passes from one point and reconnaissance satellites. This would put the Black Knight in the category of a observational Satellite.
12. In the 1960′s the Black Knight was located once again in Polar Orbit. Astronomers and Scientists calculated the objects weight to be over 10 tons which would be at that time the Heaviest Artificial Satellite to orbit our Planet.
13. The Black Knight’s orbit was unlike any other object orbiting Earth.
14. The Grumman Aircraft Corporation gave much importance to this mysterious “Satellite”, On September 3, 1960, seven months after the satellite was first detected by radar, a tracking camera at Grumman Aircraft Corporation’s Long Island factory took a photograph of the Black Knight.
15. The Grumman Aircraft Corporation formed a committee to study the data received from the observations made but nothing was made public.
16. In 1963, Gordon Cooper was launched into space. On his final orbit, he reported seeing a glowing green object in front of his capsule in the distance moving towards his Spacecraft. The Muchea tracking station, in Australia, which Cooper reported the object to, picked up this Unidentified object on Radar travelling East to West.
17. It was the Ham Radio operator who apparently  decoded a series of signals received from the UFO Satellite and interpreted it as a star-chart centered on the Epsilon Bootes Star System
18. According to the decoded message, the Black Knight  originated from the Epsilon Bootes Star System 13.000 years ago.
19. On August 23, 1954 the technology magazine Aviation Week and Space Technology released a story about the Black Knight Satellite that angered the Pentagon who were trying to keep the information secret.
20. NASA has released official images which apparently show the Black Knight Satellite.