Assertion: asteroid's magnitude | /r/HasProperty | given by msx minor planet survey
Facets:
value: usually
type: TEMPORAL
Source sentences:
text: Absolute magnitude is usually given by the IRAS minor planet survey  or the MSX minor planet survey  (available at the PDS).
text: Absolute magnitude is usually given by the IRAS minor planet survey or the MSX minor planet survey (available at the PDS).