In April 1786 William and Caroline moved to a new home they called Observatory House which was in Slough and there, on 1 August 1786, Caroline discovered her first comet which was described by some as the "first lady's comet".
Sa April 1786 William Caroline at inilipat sa isang bagong bahay nila na tinatawag na obserbatoryo House na kung saan ay sa Slough at doon, sa 1 Agosto 1786, Caroline natuklasan ang kanyang unang buntala na kung saan ay inilarawan sa pamamagitan ng ilang bilang ng "unang ginang ng bansa ng kometa".