NGC 7234 / 7235 is a relatively sparse open cluster with two names.  The cluster is located in the constellation Cepheus approximately 9,200 light-years from the Earth.  There is an interesting story behind the two designated names of the cluster.  The cluster was originally discovered by William Herschel in October of 1787.  When William's sister, Caroline, transcribed his coordinates she made a mistake and referenced a vacant part of the sky.  This was later given the designation of NGC 7234.  John Herschel, William's son, rediscovered his father's cluster in September of 1829.  Noting the coordinates his aunt had recorded were in error, he recorded the cluster at its correct location and the cluster was later designated NGC 7235.  This has resulted in both designations referring to the same open cluster.

¹https://cseligman.com/text/atlas/ngc72.htm#7234
²https://webda.physics.muni.cz/cgi-bin/ocl_page.cgi?dirname=ngc7235
³https://www.cloudynights.com/topic/526366-ngc-72345-one-cluster-two-numbers/