Merge pull request #2466 from mkelley/fix-mpc-error-messages-2022.07

bsipocz · web-flow · commit f39fcf8331b9 · 2023-05-09T00:56:29.000-07:00
Fix / test mpc error messages 2022.07
diff --git a/astroquery/mpc/core.py b/astroquery/mpc/core.py
@@ -11,16 +11,12 @@
 from astropy.table import Table, QTable, Column
 import astropy.units as u
 from astropy.coordinates import EarthLocation, Angle, SkyCoord
-try:
-    from astropy.utils.exceptions import ErfaWarning
-except ImportError:
-    # DEPRECATED: remove eventually, but needed in July 2020
-    from astropy._erfa.core import ErfaWarning
+from astropy.utils.exceptions import ErfaWarning
 
 from ..query import BaseQuery
 from . import conf
 from ..utils import async_to_sync, class_or_instance
-from ..exceptions import InvalidQueryError
+from ..exceptions import InvalidQueryError, EmptyResponseError
 
 
 __all__ = ['MPCClass']
@@ -1183,8 +1179,12 @@ def _parse_result(self, result, **kwargs):
                         result.text))
 
             if len(src) == 0:
-                raise RuntimeError(('No data queried. Are the target '
-                                    'identifiers correct?'))
+                raise EmptyResponseError(('No data queried. Are the target '
+                                          'identifiers correct?  Is the MPC '
+                                          'database search working for your '
+                                          'object? The service is hosted at '
+                                          'https://www.minorplanetcenter.net/'
+                                          'search_db'))
 
             # return raw response if requested
             if self.get_raw_response:
diff --git a/astroquery/mpc/tests/data/2008JG_ephemeris_500-a-t.html b/astroquery/mpc/tests/data/2008JG_ephemeris_500-a-t.html
@@ -0,0 +1,26 @@
+ <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">
+ <html>
+ <head>
+ <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=ISO-8859-1">
+ <title>Minor Planet Ephemeris Service: Query Results</title>
+ </head>
+ <body>
+ <h1>Minor Planet Ephemeris Service: Query Results</h1>
+ Below are the results of your request from the Minor Planet Center's
+ Minor Planet Ephemeris Service.
+ Ephemerides are for
+ the geocenter.
+ <p><hr><p>
+No current elements found for 2008 JG.  There may be published elements for this object; if there are, it is probably meaningless to make a current prediction of the basis of them.  However, when this  object is identified/recovered/rediscovered, elements will be available here.  If the designation refers to a recently designated object, ephemerides will generally be available on the day following assignment of the designation.
+ <p><hr><p>
+ These calculations have been performed on the
+ <a href="http://www.minorplanetcenter.net/iau/Ack/TamkinFoundation.html">Tamkin
+ Foundation Computing Network</a>.
+ <p><hr>
+ <p>
+       <a href="http://validator.w3.org/check?uri=referer"><img border="0"
+           src="http://www.w3.org/Icons/valid-html401"
+           alt="Valid HTML 4.01!" height="31" width="88"></a>
+ </p>
+ </body>
+ </html>
diff --git a/astroquery/mpc/tests/test_mpc.py b/astroquery/mpc/tests/test_mpc.py
@@ -2,9 +2,22 @@
 """
 test_mpc
 
-Generate offline ephemeris files for testing with the following
-commands.  The asteroid must be one that returns ephemeris
-uncertainties:
+Generate offline ephemeris files for testing with the following commands.
+
+  * The first object can be any target with successful queries.
+
+  * The second object must be one that returns ephemeris uncertainties.
+
+  * The third object must be one that does not exist in the MPC database.  The
+    string 'test fail' is sufficient.
+
+  * The fourth object must be one that fails an orbit lookup.  Today (2022
+    July), that is 2008 JG, which has a permanent number 613986. The ephemeris
+    service is not resolving the temporary designation to the permanent number,
+    and therefore fails the orbit lookup.
+
+Any changes to these queries (such as target name) must be reflected in the
+appropriate tests below.
 
 ```
 from astroquery.mpc import MPC
@@ -17,7 +30,8 @@
   '2P_ephemeris_500-a-s': ('2P', {'proper_motion': 'sky'}),
   '1994XG_ephemeris_500-a-t': ('1994 XG', {}),
   '1994XG_ephemeris_G37-a-t': ('1994 XG', {'location': 'G37'}),
-  'testfail_ephemeris_500-a-t': ('test fail', {})
+  'testfail_ephemeris_500-a-t': ('test fail', {}),
+  '2008JG_ephemeris_500-a-t': ('2008 JG', {}),
 }
 for prefix, (name, kwargs) in parameters.items():
     with open(prefix + '.html', 'w') as outf:
@@ -39,7 +53,7 @@
     wget https://minorplanetcenter.net/iau/lists/ObsCodes.html
 
 Then edit and remove all but the first 10 lines of observatories.
-This is sufficient for testing.
+This is sufficient for offline testing.
 
 """
 import os
@@ -180,6 +194,11 @@ def test_get_ephemeris_by_name_fail(patch_post):
         mpc.core.MPC.get_ephemeris('test fail')
 
 
+def test_get_ephemeris_object_without_orbit(patch_post):
+    with pytest.raises(InvalidQueryError):
+        mpc.core.MPC.get_ephemeris('2008 JG')
+
+
 def test_get_ephemeris_location_str():
     payload = mpc.core.MPC.get_ephemeris(
         '(1)', location='000', get_query_payload=True)
