Merge pull request #1086 from TOMToolkit/1074-target-detail-page-coul…

…d-automatically-display-what-constellation-a-target-is-in

add constellation to Target detail page

tom_targets/base_models.py

@@ -10,6 +10,7 @@
 from django.utils.module_loading import import_string
 from guardian.shortcuts import assign_perm
 from math import radians
+from astropy.coordinates import get_constellation, SkyCoord
 
 from tom_common.hooks import run_hook
 
@@ -488,6 +489,20 @@ def names(self):
         """
         return [self.name] + [alias.name for alias in self.aliases.all()]
 
+    @property
+    def constellation(self):
+        """
+        Gets the constellation of this target if it is sidereal
+
+        :returns: The constellation of this target according to astropy
+        :rtype: str
+        """
+        constellation = None
+        if self.type == 'SIDEREAL':
+            coordinates = SkyCoord(self.ra, self.dec, frame='icrs', unit='deg')
+            constellation = get_constellation(coordinates)
+        return constellation
+
     @property
     def future_observations(self):
         """

tom_targets/templates/tom_targets/partials/target_data.html

@@ -20,6 +20,10 @@
     {% if key == 'dec' %}
       <dt class="col-sm-6">&nbsp;</dt>
       <dd class="col-sm-6">{{ value|deg_to_sexigesimal:"dms" }}</dd>
+      {% if target.constellation %}
+        <dt class="col-sm-6">Constellation</dt>
+        <dd class="col-sm-6">{{ target.constellation }}</dd>
+      {% endif %}
     {% endif%}
   {% endfor %}
 </dl>