diff --git a/src/interfaces/SatelliteParams.ts b/src/interfaces/SatelliteParams.ts
index 1bd6cb6..d390ea8 100644
--- a/src/interfaces/SatelliteParams.ts
+++ b/src/interfaces/SatelliteParams.ts
@@ -6,11 +6,11 @@ import { EciVec3, SpaceObjectType, TleLine1, TleLine2 } from '../types/types';
 
 export interface SatelliteParams {
   name?: string;
-  rcs?: number;
+  rcs?: number | null;
   tle1: TleLine1;
   tle2: TleLine2;
   type?: SpaceObjectType;
-  vmag?: number;
+  vmag?: number | null;
   sccNum?: string;
   intlDes?: string;
   position?: EciVec3;