{"dataset":{"slug":"interstellar-detection-methods","title":"Interstellar Detection Methods","description":"The methods used to identify objects originating beyond the Solar System.","version":"1.0.0","lastGenerated":"2026-06-29","license":"CC BY-SA 4.0","entityCount":3,"sources":["jpl","nasa"]},"entities":[{"id":"interstellar_detection_method:excess-hyperbolic-velocity","name":"Excess Hyperbolic Velocity","type":"interstellar_detection_method","domain":"science","description":"The primary signature of an interstellar object: its speed relative to the Sun exceeds the local escape velocity by enough that the orbit is strongly hyperbolic (eccentricity well above 1). A large hyperbolic excess velocity (v∞) cannot be produced by planetary perturbations, so it points to an origin outside the Solar System. A small excess, by contrast, can come from a planetary slingshot and does not by itself prove an interstellar origin.","entryPath":"/interstellar-objects/detection/excess-hyperbolic-velocity"},{"id":"interstellar_detection_method:incoming-trajectory-analysis","name":"Incoming-Trajectory Analysis","type":"interstellar_detection_method","domain":"science","description":"Determining an object's orbit from astrometry and tracing its path backward. An unbound, strongly hyperbolic incoming trajectory — arriving from interstellar space rather than from the planetary region — establishes that the object was not on a closed Solar orbit. The direction it came from (its radiant) can also be identified, though no specific parent star has been pinned down for any interstellar object.","entryPath":"/interstellar-objects/detection/incoming-trajectory-analysis"},{"id":"interstellar_detection_method:spectroscopic-composition","name":"Spectroscopic Composition Analysis","type":"interstellar_detection_method","domain":"science","description":"Taking spectra and colours of a visitor to characterise its surface or coma chemistry and compare it with Solar-System comets and asteroids. Spectroscopy does not by itself prove an interstellar origin — the orbit does that — but it reveals what a body from another planetary system is made of, as with the carbon-monoxide-rich coma of 2I/Borisov.","entryPath":"/interstellar-objects/detection/spectroscopic-composition"}]}