The next serious search was started by Brian Marsden, who believed the comet had faded out of existence, but computed the orbit for a very favorable 1973 apparition.
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Johann Friedrich Julius Schmidt estimating it as 3 to 4 arcmin across on March 9, and 8 to 10 arcmin across on the 22nd of that same month.
The asteroid 3979, which was discovered by A. Mrkos in Klet on November 8, 1983, was named "Brorsen" on proposal of J. Tichá (MPC 27734 – 1996 August 28).