Update metadata storage

.codespell-ignores

@@ -2,4 +2,4 @@ chec
 usera
 nd
 studi
-REFERENC
+referenc

.pre-commit-config.yaml

@@ -16,8 +16,6 @@ repos:
       additional_dependencies:
         - tomli
       exclude: AUTHORS
-      args:
-          - --ignore-words=.codespell-ignores
 
   - repo: https://github.com/astral-sh/ruff-pre-commit
     # Ruff version.

src/ctapipe/utils/astro.py

@@ -5,7 +5,6 @@
 usage within ctapipe.
 """
 
-import json
 import logging
 from collections import namedtuple
 from copy import deepcopy
@@ -147,6 +146,7 @@ def get_star_catalog(
     if isinstance(catalog, str):
         catalog = StarCatalog[catalog]
     catalog_info = catalog.value
+    catalog_name = catalog.name
 
     vizier = Vizier(
         catalog=catalog_info.directory,
@@ -155,10 +155,19 @@ def get_star_catalog(
     )
 
     stars = vizier.query_constraints(Vmag=f"<{magnitude_cutoff}")[0]
-    meta = catalog_info._asdict()
-    meta["magnitude_cutoff"] = magnitude_cutoff
 
-    stars.meta["Catalog"] = json.dumps(meta)
+    header = {
+        "ORIGIN": "CTAPIPE",
+        "JEPOCH": float(catalog_info.coordinates["epoch"].replace("J", "")),
+        "RADESYS": catalog_info.coordinates["frame"].upper(),
+        "MAGCUT": magnitude_cutoff,
+        "BAND": "V",
+        "CATALOG": catalog_name,
+        "REFERENC": catalog_info.directory,
+        "COLUMNS": "_".join(catalog_info.columns),
+    }
+
+    stars.meta = header
 
     return stars