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Encyclopedia > Interstellar objects

INTERSTELLAR OBJECTS: 'OUMUAMUA




Credit : ESO/M. Kornmesser


Left, an artist's view of an object coming from outside of the Solar system on an hyperbolic trajectory. This object, discovered in 2017 and named 1I/2017 U1 ('Oumuamua) will not remain in the Solar system. It has an unusual shape (230m x 35m x 35m) and a dark red-brown color (albedo about 0,10) due to cosmic bombardment suffered during his interstellar journey.

Below, its orbit through the Solar system: it's coming from Lyrae constellation and will go to Pegasus.



KNOWN INTERSTELLAR BODIES (on November, 2025)


Name of the body  Provisonal
designation 		 Nature of the body  Size of the body  Discoverer  Absolute magnitude  Eccentricity 
1I/'Oumuamua 2017 U1 asteroid 235mx35mx35m Panstarrs 1 22.2 1.2
2I/Borisov C/2019 Q4 comet between 2 and 16 km Guennadi Borisov between 13.7 and 4.5 3.36
3I/Atlas C/2025 N1 comet less than 1 km Atlas-Chile 13.7 6.15