diff --git a/lisainstrument/instrument.py b/lisainstrument/instrument.py
index aa9f3cafd5775f17ab4de1ac273a3f73c3c68328..250fcb7ed6402520f7321ca6dde3268f007f9c6e 100755
--- a/lisainstrument/instrument.py
+++ b/lisainstrument/instrument.py
@@ -1794,7 +1794,7 @@ class Instrument:
             'sc_jitter_phi_asds', 'sc_jitter_eta_asds',
             'sc_jitter_theta_asds', 'mosa_jitter_phi_asds',
             'dws_asds', 'mosa_angles',
-            'orbit_file', 'orbit_dataset',
+            'orbit_file', 'orbit_dataset', 'orbits_t0',
             'gw_file', 'gw_group',
             'glitch_file',
             'interpolation_order',