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Friday, April 15, 2011

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C: Quamtum: Asteroid near the ground, 15-04 - 2011

Asteroid 2011 GP59 at its closest point to Earth on April 15, 2011 Posted: April 14, 2011 7:02 PM PDT

A new asteroid approaching Earth could provide one of the best opportunities in recent years for observation with small telescopes, as well as to facilitate the professional field in a detailed study of its structure physics. According to the British Astronomical Association, this is the best opportunity study a Near-Earth Asteroid (NEO) in recent years, due to its good location in the sky, its relatively slow movement, with its size and close proximity to the Moon.

GP59 2011, as has been tentatively designated for that purpose by the International Astronomical Union, was discovered last night April 8th from Station Robotics NEO Detection and Follow the Astronomical Observatory of Mallorca (OAM) is installed The Sierra de la Sagra (La Sagra Sky Survey). By tracking provided by other observatories, after its discovery, and communication to the Minor Planet Center of Boston (MPC), it was determined initial orbit, close but not dangerous for the Earth and approximate dimensions of the object, about 60 meters. Its orbit is of type "Aten", inside the Earth between Venus and our planet, but due to his eccentric, sporadically, as has happened on this occasion, is outside the Earth, which facilitated their detection and monitoring current .

The image is of a single exposure without a filter of 600 seconds, which shows the asteroid 2011 GP59.

The object approaching Earth yet, it will at 19h on 15 April to a minimum distance for the following days away slowly. At the time of closest approach to achieve a brightness magnitude around 13.2 and will move across the sky at about 180 seconds of arc per minute (equivalent to traverse the diameter of the full moon every 10 minutes) In Images discovery and it was detected in an unusual and abrupt change in brightness every few minutes, photometric studies conducted after the last few hours from several observatories, including Lowell Observatory (Arizona-USA), confirm that this large change in brightness responds to rapid period of rotation of an object extremely narrow and elongated, that when one side shows reflects much more light than when it displays one of its poles or extremes. The extent of this change in light is more than 2 magnitudes and rotation period of only 7.3 minutes, setting a record in terms of range of variability and rotational speed, and consequently generating many questions regarding what type of composition and how could correspond to that behavior.

It was determined an orbit close to but not dangerous for the Earth.

orbit of asteroid 2011 GP59.

One conclusion to be drawn and in his preliminary study, is that its composition should be monolithic and almost necessarily metal, it's probably a very long piece of iron-nickel over 60 meters at its longitudinal axis . Any other rock structure could not withstand the very rapid rotation that is subject and the centrifugal force created by spinning, much higher than the small gravity cohesionaría material, had been tearing the object. Speculations trying to find last minute also an artificial object such as a rocket stage that elongated and metal, but neither its orbit and size to fit any object launched from Earth.

observations in the coming days by different equipment and telescopes from different parts of the world will confirm the nature and characteristics of that body, while the amateur astronomy can visually follow the slow movement of the object among the stars only a 20 cm telescope. Source: Confidential Mallorca

GP59 2011 shows fluctuations of apparent magnitude. In the picture you can see a light curve showing an amplitude of more than two magnitudes over a period of approximately 7.5 minutes. Courtesy of Brian Skiff (Lowell Observatory): 6 hours of observations with the Lowell Schmidt of 0.55 m, with exposures of 45 seconds.

Quantum says:
Asteroid 2011 GP59 is a rock 50 or 60 feet wide (enough to fill much of a football field), which has a very irregular and a period of very fast turnover of just over 7 minutes, which surprised scientists. Day 15 will pass within about 400,000 km. of Earth (a little more than the Earth-Moon) moving through the sky with a mag. 14 to about 180 "/ minute. Your actual speed is nearly 100,000 km.

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