diff --git a/docs/notebooks/activity/lsst_comet/simple_cometary_magnitude.ipynb b/docs/notebooks/activity/lsst_comet/simple_cometary_magnitude.ipynb
index 8861339..64ebe8a 100644
--- a/docs/notebooks/activity/lsst_comet/simple_cometary_magnitude.ipynb
+++ b/docs/notebooks/activity/lsst_comet/simple_cometary_magnitude.ipynb
@@ -75,7 +75,7 @@
     "              'k':[-2],\n",
     "              'optFilter':'r',\n",
     "              'seeingFwhmEff': [1],\n",
-    "              'TrailedSourceMag': 18}\n",
+    "              'trailedSourceMagTrue': 18}\n",
     "\n",
     "test_data = pd.DataFrame(test_dict)\n",
     "\n",
@@ -154,7 +154,7 @@
    "name": "python",
    "nbconvert_exporter": "python",
    "pygments_lexer": "ipython3",
-   "version": "3.10.12"
+   "version": "3.10.14"
   }
  },
  "nbformat": 4,
diff --git a/src/sorcha_addons/activity/lsst_comet/lsst_comet_activity.py b/src/sorcha_addons/activity/lsst_comet/lsst_comet_activity.py
index 901cd1c..022c6af 100644
--- a/src/sorcha_addons/activity/lsst_comet/lsst_comet_activity.py
+++ b/src/sorcha_addons/activity/lsst_comet/lsst_comet_activity.py
@@ -25,7 +25,7 @@ class LSSTCometActivity(AbstractCometaryActivity):
     """
 
     def __init__(
-        self, required_column_names: List[str] = ["k", "afrho1", "optFilter", "TrailedSourceMag"]
+        self, required_column_names: List[str] = ["k", "afrho1", "optFilter", "trailedSourceMagTrue"]
     ) -> None:
         super().__init__(required_column_names)
 
@@ -78,8 +78,8 @@ def compute(
         except KeyError as err:
             self._log_exception(err)
 
-        df["TrailedSourceMag"] = -2.5 * np.log10(
-            10 ** (-0.4 * df["coma_magnitude"]) + 10 ** (-0.4 * df["TrailedSourceMag"])
+        df["trailedSourceMagTrue"] = -2.5 * np.log10(
+            10 ** (-0.4 * df["coma_magnitude"]) + 10 ** (-0.4 * df["trailedSourceMagTrue"])
         )
 
         return df
diff --git a/tests/activity/lsst_comet/test_PPCalculateApparentMagnitude.py b/tests/activity/lsst_comet/test_PPCalculateApparentMagnitude.py
index a0683db..13597cc 100644
--- a/tests/activity/lsst_comet/test_PPCalculateApparentMagnitude.py
+++ b/tests/activity/lsst_comet/test_PPCalculateApparentMagnitude.py
@@ -49,7 +49,7 @@ def test_PPCalculateSimpleCometaryMagnitude():
     cometary_obs = pd.DataFrame(
         {
             "optFilter": ["r", "r"],
-            "TrailedSourceMag": [19.676259, 22.748274],
+            "trailedSourceMagTrue": [19.676259, 22.748274],
             "H_r": [15.35, 15.35],
             "afrho1": [1552, 1552],
             "k": [-3.35, -3.35],
@@ -62,4 +62,4 @@ def test_PPCalculateSimpleCometaryMagnitude():
 
     df_comet = PPCalculateSimpleCometaryMagnitude(cometary_obs, ["r"], rho, delta, alpha, "lsst_comet")
 
-    assert_almost_equal(df_comet["TrailedSourceMag"], [15.757, 22.461], decimal=3)
+    assert_almost_equal(df_comet["trailedSourceMagTrue"], [15.757, 22.461], decimal=3)