154 Bertha is a main-belt asteroid. It was discovered by the French brothers Paul Henry and Prosper Henry on November 4 1875 but the credit for the discovery was given to Prosper. It is probably named after Berthe Martin-Flammarion sister of the astronomer Camille Flammarion.Observations performed at the Palmer Divide Observatory in Colorado Springs Colorado in during 2007 produced a light curve with a period of 22.30 ± 0.03 hours and a brightness range of 0.10 ± 0.02 in magnitude.
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