🥅 Add warning when planetary body fetching is not returning the same …

…object as expected

src/ipyaladin/utils/_coordinate_parser.py

@@ -1,9 +1,12 @@
+import warnings
 from typing import Tuple
 
 import requests
 from astropy.coordinates import SkyCoord, Angle
 import re
 
+from ipyaladin.utils.exceptions import NameResolverWarning
+
 
 def parse_coordinate_string(string: str, body: str = "sky") -> SkyCoord:
     """Parse a string containing coordinates.
@@ -64,9 +67,17 @@ def _from_name_on_planet(string: str, body: str) -> SkyCoord:
     if request.status_code != requests.codes.ok:
         raise ValueError(f"Invalid coordinate string: {string}")
     data = request.json()
+    identifier = data["data"][0][1]
     lat = data["data"][0][5]
     lon = data["data"][0][6]
     system = data["data"][0][11]
+    if identifier != string:
+        warnings.warn(
+            f"Nothing found for '{string}', but found close"
+            f" name '{identifier}'. Moving to {identifier}.",
+            NameResolverWarning,
+            stacklevel=2,
+        )
     if "+West" in system:
         lon = 360 - lon
     return SkyCoord(ra=lon, dec=lat, frame="icrs", unit="deg")

src/ipyaladin/utils/exceptions.py

@@ -4,3 +4,11 @@ class WidgetCommunicationError(OSError):
     def __init__(self, message: str) -> None:
         self.message = message
         super(WidgetCommunicationError, self).__init__(message)
+
+
+class NameResolverWarning(UserWarning):
+    """Warning raised when a name resolver is used."""
+
+    def __init__(self, message: str) -> None:
+        self.message = message
+        super(NameResolverWarning, self).__init__(message)