391 Ingeborg is a relatively large Mars-crossing asteroid that was discovered by Max Wolf on November 1, 1894 at Heidelberg observatory. When discovered the asteroid was observed for a couple of weeks, and follow-up observations were made in 1901 and 1904.<ref name="MPC"/>
With an absolute magnitude of 10.8,<ref name=jpldata/> the asteroid is about 18–40 km in diameter.<ref name="h"/> Other large Mars crossing minor planets include 132 Aethra (43km), 323 Brucia (36km), and 2204 Lyyli (25km).
(391) Ingeborg sections
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