fix bugs
diff --git a/planetstack/observer/syncstep.py b/planetstack/observer/syncstep.py
index 8e8d4fc..75f575c 100644
--- a/planetstack/observer/syncstep.py
+++ b/planetstack/observer/syncstep.py
@@ -59,5 +59,5 @@
                     failed.append(o)
         return failed
 
-    def __call__(self):
-        return self.call()
+    def __call__(self, **args):
+        return self.call(**args)