NSF National Optical-Infrared Research Laboratory | Gemini Observatory | 2020 Feb 27
Mysterious object could be natural or human-made, more observations needed to tell the full story
Astronomers using the International Gemini Observatory, on Hawaii’s Maunakea, have imaged a very small object in orbit around the Earth, thought to be only a few meters across. According to Grigori Fedorets, the lead astronomer for the observations, the object could be a rare natural rocky object, or it could be something humans put into space decades ago — essentially space debris. “Either way this is a very compelling object and needs more data to determine what it is,” said Fedorets.
The newly discovered orbiting object has been assigned the provisional designation 2020 CD3 by the International Astronomical Union’s Minor Planet Center. If it is natural in origin, such as an asteroid, then it is only the second known rocky satellite of the Earth ever discovered in space other than the Moon. The other body, discovered in 2006, has since been ejected out of Earth orbit. 2020 CD3 was discovered on the night of 15 February 2020 by Kacper Wierzchos and Teddy Pruyne at the Catalina Sky Survey operating out of the University of Arizona’s Lunar and Planetary Laboratory in Tucson Arizona.
The image, obtained on 24 February 2020, shows simply a tiny pinpoint of light against trailing stars. “The stars are trailing because this object is moving relative to the background stars and the 8-meter Gemini North telescope was tracking on this object,” said Fedorets, adding that it is challenging to follow moving objects like this with a big telescope like Gemini. John Blakeslee, Head of Science at the international Gemini Observatory comments, “Obtaining the images was a scramble for the Gemini team because the object is quickly becoming fainter as it moves away from Earth. It is expected to be ejected from Earth’s orbit altogether in April.” ...
