diff --git a/ZeroSpace/ZeroSpace.MapEditor/Models/MapNode.cs b/ZeroSpace/ZeroSpace.MapEditor/Models/MapNode.cs
new file mode 100644
index 0000000..d3f8d8a
--- /dev/null
+++ b/ZeroSpace/ZeroSpace.MapEditor/Models/MapNode.cs
@@ -0,0 +1,30 @@
+using ZeroSpace.MapEditor.Services;
+
+namespace ZeroSpace.MapEditor.Models;
+
+/// <summary>
+/// A star system node on the map canvas: the document plus selection state.
+/// </summary>
+public sealed class MapNode
+{
+    public MapNode(StarSystemDoc doc)
+    {
+        Doc = doc;
+    }
+
+    public StarSystemDoc Doc { get; }
+
+    public double X
+    {
+        get => Doc.X;
+        set => Doc.X = value;
+    }
+
+    public double Y
+    {
+        get => Doc.Y;
+        set => Doc.Y = value;
+    }
+
+    public bool IsSelected { get; set; }
+}