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Steins-asteroidin pimeä puoli kartoitettu suomalaisvoimin

8 tammikuuta 2010

Takaisin artikkeliin

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An animation of the closest approach of Rosetta to asteroid Steins, taken with the OSIRIS imaging system’s Wide Angle Camera. The image sequence starts 3 minutes before closest approach, from a distance of about 2000 km and ends 4 minutes after closest approach. At the start of the animation, the sun illuminated the asteroid from behind the spacecraft and no shadows are visible on the its surface. Later, the sunlight is incident from the left, and craters and more surface features become visible.

Credits: ESA ©2008 MPS for OSIRIS Team MPS/UPD/LAM/IAA
/RSSD/INTA/UPM/DASP/IDA

Takaisin artikkeliin

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Credits: Science Mag Jan 2010 / Kaasalainen

Inversio-ongelma

Takaisin artikkeliin

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The animation is composed of images that were used for the optical navigation campaign, as Rosetta followed (2867) Steins, refining its trajectory to close in on the asteroid. They were taken once a day by Navigation camera A, between 25 August and 3 September.

The images have been adjusted so that the stars are of roughly the same brightness from day to day, although the exposure times decrease and Steins becomes brighter as Rosetta appoaches.

Credits: ESA

Seuraavaksi kiikarissa Lutetia

Takaisin artikkeliin

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Brightness variation of the asteroid measured continuously over one day. The maximum in the light curve is about 23 percent brighter than the minimum.

Credits: Stefano Mottola (DLR), OSIRIS team

Takaisin artikkeliin

Artist’s impression of Rosetta as it flies by asteroid Steins

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ESA’s Rosetta spacecraft flew by asteroid (2867) Steins on 5 September 2008 at 20:58 CEST, ground received time (= spacecraft time CEST + 20 minutes), with a closest approach distance of 800 km.

Steins was Rosetta’s first nominal scientific target. The spacecraft encountered the asteroid in the course of its first incursion into the main asteroid belt located between the orbits of Mars and Jupiter, while on its way to Comet 67P/Churyumov-Gerasimenko.

The study of asteroids is extremely important because they represent samples of Solar System material at different stages of evolution – key to understanding the origin of our own planet and of our planetary neighbourhood.

Credits: ESA, image by C.Carreau

ESA's comet chaser

Aiheeseen liittyviä artikkeleita

Steins: A diamond in the sky Rosetta spacecraft meets asteroid Steins Rosetta fly-by of Steins: Orbit animation

Aiheeseen liittyviä linkkejä

Science-lehden artikkeli 8.1.2010: H.U. Keller et al. "E-type asteroid (2867) Steins as imaged by OSIRIS on board Rosetta"Tampereen teknillinen yliopisto, Matematiikan laitos