diff --git a/NewHorizons/Schemas/body_schema.json b/NewHorizons/Schemas/body_schema.json
index beca9fc9..5a1a7f7c 100644
--- a/NewHorizons/Schemas/body_schema.json
+++ b/NewHorizons/Schemas/body_schema.json
@@ -1094,6 +1094,7 @@
           "type": "number",
           "description": "The semi-major axis of the ellipse that is the body's orbit. For a circular orbit this is the radius.",
           "format": "float",
+          "default": 5000.0,
           "minimum": 0.0
         },
         "inclination": {