diff --git a/laika/downloader.py b/laika/downloader.py
index ba8e0e5..983f48f 100644
--- a/laika/downloader.py
+++ b/laika/downloader.py
@@ -361,7 +361,7 @@ def download_orbits_gps(time, cache_dir, ephem_types):
     ephem_strs =  {
       EphemerisType.FINAL_ORBIT: ['IGS0OPSFIN_{yyyy}{doy}0000_01D_15M_ORB.SP3'.format(yyyy=time.year, doy=time.doy)],
       EphemerisType.RAPID_ORBIT: ['IGS0OPSRAP_{yyyy}{doy}0000_01D_15M_ORB.SP3'.format(yyyy=time.year, doy=time.doy)],
-      EphemerisType.ULTRA_RAPID_ORBIT: ['IGS0OPSULT_{yyyy}{doy}0000_02D_15M_ORB.SP3'.format(yyyy=time.year, doy=time.doy)],
+      EphemerisType.ULTRA_RAPID_ORBIT: ['IGS0OPSULT_{yyyy}{doy}{hh}00_02D_15M_ORB.SP3'.format(yyyy=time.year, doy=time.doy, hh=hour) for hour in ['18', '12', '06', '00']],
     }
 
   folder_path = "%i/" % time.week