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Found! Weird Asteroid in Jupiter's Orbit Is 1st Interstellar Immigrant

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2015 BZ509 was discovered in November 2014, also by Pan-STARRS (which is short for "Panoramic Survey Telescope and Rapid Response System," in case you were wondering). The space rock is an oddball: Its orbit is "retrograde," meaning 2015 BZ509 moves around the sun in the opposite direction of Jupiter, Earth and most other bodies in the solar system.

"How the asteroid came to move in this way while sharing Jupiter's orbit has until now been a mystery," astronomer Fathi Namouni of the Côte d'Azur Observatory in France, who led the new study, said in a statement. "If 2015 BZ509 were a native of our system, it should have had the same original direction as all of the other planets and asteroids, inherited from the cloud of gas and dust that formed them."

Namouni and study co-author Helena Morais, who's based at São Paulo State University in Brazil, performed computer simulations that traced 2015 BZ509's movements backward through time.

"We showed that 2015 BZ509 has been a retrograde co-orbital of Jupiter over the age of the solar system, i.e., since 4.5 billion years ago," Morais told Space.com via email. "The solar system could not produce retrograde orbits so far back in time, so the only option left is that of capture from another system."

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Subject Views Written By Posted
Asteroid in retrograde orbit must be from outside the solar system 1789 Nolondil 22-May-18 15:05
Have Aliens Found Us? A Harvard Astronomer on the Mysterious Interstellar Object ‘Oumuamua 166 WVK 18-Jan-19 02:17
Re: Have Aliens Found Us? A Harvard Astronomer on the Mysterious Interstellar Object ‘Oumuamua 137 D-Archer 18-Jan-19 09:28
Re: Have Aliens Found Us? A Harvard Astronomer on the Mysterious Interstellar Object ‘Oumuamua 128 WVK 18-Jan-19 15:02
Re: Have Aliens Found Us? A Harvard Astronomer on the Mysterious Interstellar Object ‘Oumuamua 131 D-Archer 18-Jan-19 15:16
Mod Note > Duplicate Topic Merged 125 Dr. Troglodyte 18-Jan-19 16:13
Re: Have Aliens Found Us? A Harvard Astronomer on the Mysterious Interstellar Object ‘Oumuamua 100 drrayeye 30-Jan-19 06:47
Re: Have Aliens Found Us? A Harvard Astronomer on the Mysterious Interstellar Object ‘Oumuamua 71 LonelyAngel 28-Feb-19 15:53
Re: Asteroid in retrograde orbit must be from outside the solar system 132 Susan Doris 20-Jan-19 11:14
Re: Asteroid in retrograde orbit must be from outside the solar system 138 Eddie Larry 20-Jan-19 15:46
Re: Asteroid in retrograde orbit must be from outside the solar system 114 Susan Doris 23-Jan-19 12:02
Re: Asteroid in retrograde orbit must be from outside the solar system 131 Nolondil 21-Jan-19 03:16
Re: Asteroid in retrograde orbit must be from outside the solar system 115 Susan Doris 23-Jan-19 13:47
Re: Asteroid in retrograde orbit must be from outside the solar system 118 Nolondil 23-Jan-19 18:51
Re: Asteroid in retrograde orbit must be from outside the solar system 103 Susan Doris 23-Jan-19 19:22
Re: Asteroid in retrograde orbit must be from outside the solar system 100 Eddie Larry 25-Jan-19 18:07
Re: Asteroid in retrograde orbit must be from outside the solar system 95 Susan Doris 27-Jan-19 05:53
Re: Asteroid in retrograde orbit must be from outside the solar system 124 D-Archer 21-Jan-19 13:29
Re: Asteroid in retrograde orbit must be from outside the solar system 71 ianw16 25-Feb-19 22:05
Re: Asteroid in retrograde orbit must be from outside the solar system 71 D-Archer 26-Feb-19 10:46
Re: Asteroid in retrograde orbit must be from outside the solar system 77 ianw16 26-Feb-19 10:59
Re: Asteroid in retrograde orbit must be from outside the solar system 74 D-Archer 27-Feb-19 17:06
Re: Asteroid in retrograde orbit must be from outside the solar system 69 ianw16 28-Feb-19 14:44
Re: Asteroid in retrograde orbit must be from outside the solar system 77 D-Archer 01-Mar-19 12:23
Re: Asteroid in retrograde orbit must be from outside the solar system 102 ianw16 05-Mar-19 11:04


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