Claim: 6257 Thorvaldsen was discovered by C.J Van Houten, Ingrid van Houten-Groeneveld, and T. Gherels at Palomar Observatory in 1971.
Evidence: It was discovered during the Palomar–Leiden Trojan survey on 26 March 1971, by Ingrid and Cornelis van Houten at Leiden, and Tom Gehrels at Palomar Observatory in California. Ingrid van Houten-Groeneveld (Dutch pronunciation: [ˈɪŋɡrɪt fɑn ˈɦʌutə(ŋ) ˈɣrunəˌvɛlt; 21 October 1921 – 30 March 2015) was a Dutch astronomer. In a jointly credited trio with Tom Gehrels and her husband Cornelis Johannes van Houten, she was the discoverer of many thousands of asteroids (credited by the Minor Planet Center with the discovery of 4,641 numbered minor planets).