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| ncannily like a skull that first passed our planet at 78,000mph (125,500km/h) at a distance of 310,000 miles (499,000km) on October 31, 2015, just in time for Halloween (artist's impression) |
Earth is set for another spooky encounter with a 700 metre asteroid that looks uncannily like a skull. The space rock first passed 'close' to our planet at 78,000mph (125,500km/h) at a distance of 310,000 miles (499,000km) on October 31, 2015, just in time for Halloween. This is a really creepy asteroid.
Now, it's set to make a
return in November 2018, giving scientists another opportunity to study the
strange phenomenon. Experts studying the 2015 flyby of the object recently
published a paper detailing their observations, which they hope to add to when
it makes its comeback. Scientists used observatories around the world,
including from Hawaii using the Pan-STARRS telescope, to make their findings.
The rock, known as 2015
TB145, will flyby at a less dramatic distance than the last one. The asteroid
will zoom past the planet at about 105 Earth-moon distances, compared to just
under 1.3 lunar distances last time around.
Astronomers analysing the
2015 readings found that the asteroid likely completes one rotation every 2.94
hours. The object measures between 625 and 700 metres (2,000 to 2,300 feet),
its shape is a slightly flattened ellipsoid, and its rotation axis was roughly
perpendicular to the Earth at the time of its closest proximity.
The amount of heat which
it retains and the speed at which it absorbs or transfers heat is consistent
with that of similar sized asteroids. The reflectivity or albedo of the surface
of this asteroid is around five or six per cent. In a written statement,
researcher Pablo Santos-Sanz, from the Institute of Astrophysics of Andalusia,
said: 'This means that it is very dark, only slightly more reflective than
charcoal.
'It is currently 3.7
astronomical units away from Earth; that is, 3.7 times the average distance
from the Earth to the sun. It has a magnitude of 26.5, which means it is only
visible from Earth using very large telescopes or space telescopes.’
The full finding were
published in the journal Astronomy & Astrophysics. Back in 2015, the
comet's approach led to claims from conspiracy theorists that it could
cause earthquakes and tsunamis.
One Reddit user said: 'I
assume it would wipe out any city it happened to hit. If it were to hit, there
is a 71 per cent chance it will hit water. A tsunami would be the biggest
concern. Another added that it could mean 'very bad things'.
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| Back in 2015, the comet's approach led to claims from conspiracy theorists that it could cause earthquakes and tsunamis (artist's impression) |
They said: 'The fireball
would have an apparent radius of over eight km (five miles), and it'd cause an
earthquake measuring in the high 7s on the Richter scale.'
Scientists also think that
the asteroid could in fact be an extinct comet which lost its volatile
compounds after orbiting the Sun numerous times. In general, asteroids and comets are mainly distinguished
by their composition, the former being more rocky and metallic, while the
latter have a higher proportion of ice and rock.
Their type of orbit around
the Sun also differs, but at times it is not easy to tell them apart and rhe
boundaries between them are becoming increasingly diffuse. Both were formed
during the first stages of our solar system, which was born around 4.6 billion
years ago.
Asteroid 2015 TB145 was
discovered on October 10, 2015, by the University of Hawaii's Pan-STARRS-1
(Panoramic Survey Telescope and Rapid Response System) on Haleakala, Maui, part
of the NASA-funded Near-Earth Object Observations (NEOO) Program.
Because of its erratic
orbit, Nasa isn't sure where it will go, but the space agency says it's confident
it will not hit Earth.
Via Dailymail