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{{#invoke:Infobox|infobox}} 135 Hertha is a large main-belt asteroid. Named Hertha, another name for Nerthus, a Germanic fertility goddess. It orbits among the Nysa asteroid family but its classification as an M-type asteroid does not match the more common F-type asteroid for this family, suggesting that it may be an interloper.<ref>{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref> Spectroscopic analysis indicates the possible presence of hydrated silicates indicating that 135 Hertha should possibly be reclassified from its present M-type to the proposed W-type.<ref name=puzzling-case>{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref>

Lightcurve data from Hertha indicates a flattened body,<ref name=shape-rotation/> and radar observations indicate that Hertha is non-metallic.<ref name=radar>{{#invoke:Citation/CS1|citation |CitationClass=journal }}</ref> One occultation of a star by the asteroid has been observed, in 2000.


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