# Newman-Penrose charges The **Newman-Penrose charges** are 10 conserved charges of an asymptotically spacetime measured near null infinity. They are not very useful actually: since they are constants, they don't tell you how much radiation is lost. ## Refs - OG NewmanPenrose1962 [](https://inspirehep.net/literature/8892); - also NewmanPenrose1965 [](https://journals.aps.org/prl/abstract/10.1103/PhysRevLett.15.231) and NewmanPenrose1968 [](https://royalsocietypublishing.org/doi/10.1098/rspa.1968.0112)