Times of Orbital Events for Apr. 2, 2019 to Mar 29, 2020

Radiation zone passages occur between the end of one orbit and the beginning of the next. During radiation zone passages, no Chandra observations are possible due to the high particle background and the need to protect ACIS. For observations which must be tightly constrained, observers may wish to check projected estimates of usable orbit intervals (and their unusable complement during the radiation zone).

The begin and end orbit times listed below are conservative guesses as to the actual radiation zone entry and exit times. They are found from the perigee times given in a predictive ephemeris in the following manner:

Actual useful segments of orbits are likely to be somewhat longer, but should not be shorter than the times listed here. However, the perigee times will be less accurate as time increases from the creation date. At one year after the creation date, the perigee times are expected to be about 20 minutes off from the actual perigee time.

The date/times are provided here in Calendar (UTC) format. To convert to other date formats, please see the Date Conversion Tool page.

Earlier orbital event times can be accessed on our archived orbits pages.

OrbitBegin OrbitEnd Orbit
27152019 Apr 02 22:22:42.952019 Apr 04 17:50:18.66
27162019 Apr 05 13:50:18.662019 Apr 07 09:17:43.54
27172019 Apr 08 05:17:43.542019 Apr 10 00:45:19.41
27182019 Apr 10 20:45:19.412019 Apr 12 16:13:25.85
27192019 Apr 13 12:13:25.852019 Apr 15 07:42:09.71
27202019 Apr 16 03:42:09.712019 Apr 17 23:10:44.81
27212019 Apr 18 19:10:44.812019 Apr 20 14:38:29.50
27222019 Apr 21 10:38:29.502019 Apr 23 06:05:45.90
27232019 Apr 24 02:05:45.902019 Apr 25 21:33:19.29
27242019 Apr 26 17:33:19.292019 Apr 28 13:01:04.82
27252019 Apr 29 09:01:04.822019 May 01 04:28:38.47
27262019 May 02 00:28:38.472019 May 03 19:55:57.00
27272019 May 04 15:55:57.002019 May 06 11:23:19.02
27282019 May 07 07:23:19.022019 May 09 02:51:12.43
27292019 May 09 22:51:12.432019 May 11 18:19:45.74
27302019 May 12 14:19:45.742019 May 14 09:48:23.80
27312019 May 15 05:48:23.802019 May 17 01:16:22.38
27322019 May 17 21:16:22.382019 May 19 16:43:39.17
27332019 May 20 12:43:39.172019 May 22 08:10:58.82
27342019 May 23 04:10:58.822019 May 24 23:38:40.23
27352019 May 25 19:38:40.232019 May 27 15:06:20.50
27362019 May 28 11:06:20.502019 May 30 06:33:42.02
27372019 May 31 02:33:42.022019 Jun 01 22:00:59.85
27382019 Jun 02 18:00:59.852019 Jun 04 13:28:43.13
27392019 Jun 05 09:28:43.132019 Jun 07 04:57:12.08
27402019 Jun 08 00:57:12.082019 Jun 09 20:25:58.88
27412019 Jun 10 16:25:58.882019 Jun 12 11:54:16.49
27422019 Jun 13 07:54:16.492019 Jun 15 03:21:48.35
27432019 Jun 15 23:21:48.352019 Jun 17 18:49:11.21
27442019 Jun 18 14:49:11.212019 Jun 20 10:16:57.98
27452019 Jun 21 06:16:57.982019 Jun 23 01:44:49.12
27462019 Jun 23 21:44:49.122019 Jun 25 17:12:25.95
27472019 Jun 26 13:12:25.952019 Jun 28 08:39:55.82
27482019 Jun 29 04:39:55.822019 Jul 01 00:07:36.31
27492019 Jul 01 20:07:36.312019 Jul 03 15:35:58.33
27502019 Jul 04 11:35:58.332019 Jul 06 07:04:57.50
27512019 Jul 07 03:04:57.502019 Jul 08 22:33:35.95
27522019 Jul 09 18:33:35.952019 Jul 11 14:01:28.45
27532019 Jul 12 10:01:28.452019 Jul 14 05:28:57.49
27542019 Jul 15 01:28:57.492019 Jul 16 20:56:46.84
27552019 Jul 17 16:56:46.842019 Jul 19 12:24:48.14
27562019 Jul 20 08:24:48.142019 Jul 22 03:52:38.58
27572019 Jul 22 23:52:38.582019 Jul 24 19:20:18.12
27582019 Jul 25 15:20:18.122019 Jul 27 10:48:03.84
27592019 Jul 28 06:48:03.842019 Jul 30 02:16:19.00
27602019 Jul 30 22:16:19.002019 Aug 01 17:45:18.71
27612019 Aug 02 13:45:18.712019 Aug 04 09:14:18.58
27622019 Aug 05 05:14:18.582019 Aug 07 00:42:27.04
27632019 Aug 07 20:42:27.042019 Aug 09 16:10:00.06
27642019 Aug 10 12:10:00.062019 Aug 12 07:37:48.88
27652019 Aug 13 03:37:48.882019 Aug 14 23:05:56.77
27662019 Aug 15 19:05:56.772019 Aug 17 14:33:55.60
27672019 Aug 18 10:33:55.602019 Aug 20 06:01:44.94
27682019 Aug 21 02:01:44.942019 Aug 22 21:29:31.22
27692019 Aug 23 17:29:31.222019 Aug 25 12:57:37.79
27702019 Aug 26 08:57:37.792019 Aug 28 04:26:23.88
27712019 Aug 29 00:26:23.882019 Aug 30 19:55:32.79
27722019 Aug 31 15:55:32.792019 Sep 02 11:23:58.36
27732019 Sep 03 07:23:58.362019 Sep 05 02:51:25.80
27742019 Sep 05 22:51:25.802019 Sep 07 18:19:01.77
27752019 Sep 08 14:19:01.772019 Sep 10 09:47:00.29
27762019 Sep 11 05:47:00.292019 Sep 13 01:14:56.36
27772019 Sep 13 21:14:56.362019 Sep 15 16:42:39.16
27782019 Sep 16 12:42:39.162019 Sep 18 08:10:15.42
27792019 Sep 19 04:10:15.422019 Sep 20 23:38:08.37
27802019 Sep 21 19:38:08.372019 Sep 23 15:06:32.45
27812019 Sep 24 11:06:32.452019 Sep 26 06:35:30.44
27822019 Sep 27 02:35:30.442019 Sep 28 22:04:06.76
27832019 Sep 29 18:04:06.762019 Oct 01 13:31:34.81
27842019 Oct 02 09:31:34.812019 Oct 04 04:58:43.78
27852019 Oct 05 00:58:43.782019 Oct 06 20:26:22.75
27862019 Oct 07 16:26:22.752019 Oct 09 11:54:11.32
27872019 Oct 10 07:54:11.322019 Oct 12 03:21:46.89
27882019 Oct 12 23:21:46.892019 Oct 14 18:49:09.92
27892019 Oct 15 14:49:09.922019 Oct 17 10:16:47.40
27902019 Oct 18 06:16:47.402019 Oct 20 01:44:54.44
27912019 Oct 20 21:44:54.442019 Oct 22 17:13:33.83
27922019 Oct 23 13:13:33.832019 Oct 25 08:42:15.29
27932019 Oct 26 04:42:15.292019 Oct 28 00:09:58.87
27942019 Oct 28 20:09:58.872019 Oct 30 15:36:52.96
27952019 Oct 31 11:36:52.962019 Nov 02 07:04:09.11
27962019 Nov 03 03:04:09.112019 Nov 04 22:31:47.64
27972019 Nov 05 18:31:47.642019 Nov 07 13:59:18.52
27982019 Nov 08 09:59:18.522019 Nov 10 05:26:37.25
27992019 Nov 11 01:26:37.252019 Nov 12 20:53:59.99
28002019 Nov 13 16:53:59.992019 Nov 15 12:21:52.38
28012019 Nov 16 08:21:52.382019 Nov 18 03:50:23.52
28022019 Nov 18 23:50:23.522019 Nov 20 19:19:06.77
28032019 Nov 21 15:19:06.772019 Nov 23 10:47:10.30
28042019 Nov 24 06:47:10.302019 Nov 26 02:14:15.79
28052019 Nov 26 22:14:15.792019 Nov 28 17:41:20.67
28062019 Nov 29 13:41:20.672019 Dec 01 09:08:56.15
28072019 Dec 02 05:08:56.152019 Dec 04 00:36:37.01
28082019 Dec 04 20:36:37.012019 Dec 06 16:04:03.08
28092019 Dec 07 12:04:03.082019 Dec 09 07:31:27.17
28102019 Dec 10 03:31:27.172019 Dec 11 22:59:17.78
28112019 Dec 12 18:59:17.782019 Dec 14 14:27:50.55
28122019 Dec 15 10:27:50.552019 Dec 17 05:56:48.27
28132019 Dec 18 01:56:48.272019 Dec 19 21:25:21.45
28142019 Dec 20 17:25:21.452019 Dec 22 12:52:56.66
28152019 Dec 23 08:52:56.662019 Dec 25 04:20:07.62
28162019 Dec 26 00:20:07.622019 Dec 27 19:47:49.74
28172019 Dec 28 15:47:49.742019 Dec 30 11:15:45.81
28182019 Dec 31 07:15:45.812020 Jan 02 02:43:27.16
28192020 Jan 02 22:43:27.162020 Jan 04 18:11:04.34
28202020 Jan 05 14:11:04.342020 Jan 07 09:38:58.09
28212020 Jan 08 05:38:58.092020 Jan 10 01:07:28.71
28222020 Jan 10 21:07:28.712020 Jan 12 16:36:39.16
28232020 Jan 13 12:36:39.162020 Jan 15 08:05:37.34
28242020 Jan 16 04:05:37.342020 Jan 17 23:33:36.91
28252020 Jan 18 19:33:36.912020 Jan 20 15:00:57.18
28262020 Jan 21 11:00:57.182020 Jan 23 06:28:40.53
28272020 Jan 24 02:28:40.532020 Jan 25 21:56:46.92
28282020 Jan 26 17:56:46.922020 Jan 28 13:24:42.79
28292020 Jan 29 09:24:42.792020 Jan 31 04:52:28.56
28302020 Feb 01 00:52:28.562020 Feb 02 20:20:23.33
28312020 Feb 03 16:20:23.332020 Feb 05 11:48:47.34
28322020 Feb 06 07:48:47.342020 Feb 08 03:17:52.60
28332020 Feb 08 23:17:52.602020 Feb 10 18:47:09.42
28342020 Feb 11 14:47:09.422020 Feb 13 10:15:29.86
28352020 Feb 14 06:15:29.862020 Feb 16 01:42:53.15
28362020 Feb 16 21:42:53.152020 Feb 18 17:10:27.52
28372020 Feb 19 13:10:27.522020 Feb 21 08:38:31.42
28382020 Feb 22 04:38:31.422020 Feb 24 00:06:29.90
28392020 Feb 24 20:06:29.902020 Feb 26 15:34:12.09
28402020 Feb 27 11:34:12.092020 Feb 29 07:01:57.45
28412020 Mar 01 03:01:57.452020 Mar 02 22:30:05.20
28422020 Mar 03 18:30:05.202020 Mar 05 13:58:45.76
28432020 Mar 06 09:58:45.762020 Mar 08 05:27:56.81
28442020 Mar 09 01:27:56.812020 Mar 10 20:56:29.61
28452020 Mar 11 16:56:29.612020 Mar 13 12:23:47.52
28462020 Mar 14 08:23:47.522020 Mar 16 03:50:53.65
28472020 Mar 16 23:50:53.652020 Mar 18 19:18:37.99
28482020 Mar 19 15:18:37.992020 Mar 21 10:46:28.05
28492020 Mar 22 06:46:28.052020 Mar 24 02:13:57.94
28502020 Mar 24 22:13:57.942020 Mar 26 17:41:27.09
28512020 Mar 27 13:41:27.092020 Mar 29 09:09:13.80