The new berg is 2,240 square miles, roughly the same size as the state of Delaware.
Though scientists have been expecting its latest move - which reportedly occurred sometime between Monday, July 10, and Wednesday, July 12 - for a while now, I'm feeling unsettled by the news.
The Larsen C ice shelf, one of the biggest icebergs in recorded history is about 6,600 square kilometres in total, according to the European Space Agency (ESA) broke off of the West Antarctic ice shelf.
The Larsen C Ice Shelf is composed of floating ice at the front of glaciers on the narrow Antarctic Peninsula.
If Larsen C melts, it could allow glaciers to flow off the land quicker, but at a still relatively-modest rate.
The iceberg was already floating before it calved away, so it has no immediate impact on sea level. The final breakthrough was detected in images from NASA's satellite instruments, they said.
Luckman is the lead investigator on the MIDAS Project, a team of researchers in the United Kingdom studying the Larsen C ice shelf.
One of the largest icebergs ever recorded has just broken off from Antarctica.
And a spokeswoman for the British Antarctic survey said there's not enough information to say whether the calving is an effect of climate change, though there's good evidence global warming has caused thinning of the ice shelf.
The growth of the crack reportedly sped up starting in 2014, and, as Mic reported earlier in July, scientists had been preparing for a large iceberg to cleave off of the ice shelf as a result of the rift.
Its volume is twice that of Lake Erie, the fourth-largest lake of the five Great Lakes in North America, and the thirteenth-largest globally if measured in terms of surface area.
The iceberg has been close to breaking off for a few months.
Dr Martin O'Leary, a glaciologist who also worked as a part of the MIDAS team, said the shelf is now in a "very vulnerable position".