Assertion: comet | /r/HasProperty | lost
Facets:
value: even so
type: OTHER
Source sentences:
text: Comets that have been lost or disappeared have names with a "D".
text: The comet has not been seen since 1770 and is considered a lost comet.
text: Even so, quite a few comets were lost because their orbits are also affected by non-gravitational effects such as the release of gas and other material that forms the comet's coma and tail.
text: In comet nomenclature, the letter before the "/" is either "C" (a non-periodic comet), "P" (a periodic comet), "D" (a comet that has been lost or has disintegrated), "X" (a comet for which no reliable orbit could be calculated —usually historical comets), "I" for an interstellar object, or "A" for an object that was either mistakenly identified as a comet, but is actually a minor planet, or for an object on a hyperbolic orbit that does not show cometary activity.
text: Comets that have been lost or which have disappeared have names beginning with a D, according to current naming conventions.