Omwamwi was less than expected by scientistsIn the new study he obtained data on the first known interstellar object that flew through the solar system, writes the Chronicle.info with reference to the Telegraph.
Omwamwi was first recorded in October 2017 with a Pan-STARRS 1 telescope in Hawaii during the review of near-Earth asteroids. Other observations by numerous ground-based telescopes and the Hubble Space Telescope showed that the surface of the object reflected sunlight. Great variations on the subject's brilliance have led to the conclusion that Omwamwi has an elongated shape and is probably no more than 800 meters long.
Recently in the journal Astronomical Journal a new study according to which some inferences about Omwamwi are not quite true.
The Spitzer Space Telescope tracks asteroids and comets by the infrared energy, or heat, radiated by them. It can provide more accurate information about object size than optical observations or reflected sunlight. The fact that Omwamwi was too weak for "Spitzer" establishes certain limits in relation to the total area of its surface.
Using three different models that provide different hypotheses about object composition, Spitzer restricted the Omwamwi spherical diameter to 400, 140, and 100 meters. Big difference in results is based on hypotheses about the composition of Omwamwi influencing how they see the "Spitzer" in a certain size.
"Omwamwi was full of surprises from day one, so we could not wait to show" Spitzer, "says lead author David Trilling of Northern Arizona University. registering it is, in fact, a valuable result. "
New size limits correspond to the recent survey conducted by ESA astronomer Marco Micheli. According to them, small changes in the speed and direction of the Omwamwi occurred as a result of the degassing. In other words, allotted from the gas surface acted as a small accelerator.
Omwamwi also proved to be slightly less than the normal comets in the Solar system. The conclusion that he experienced degassing, implying that it consisted of frozen gases like a comet.
"Our study also suggests that Omwamwi can be 10 times more reflective (having a higher albedo – Approx. Ed.) Than comets in the solar system," says Trilling.
The comet's albedo may change during its "life". As it approaches the Sun, its ice heats up and turns into gas, sweeping dust and dirt from the surface and discovering more reflective ice.
Omwamwi traveled through interstellar space millions of years away from stars that could "refresh" the surface. But it may be warm enough to approach the Sun for about five weeks before its opening.