Chandra X-Ray Observatory
	(CXC)

Times of Orbital Events for Oct. 1, 2017 to Apr. 2, 2019

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
25072017 Sep 29 21:45:01.722017 Oct 01 17:12:43.80
25082017 Oct 02 13:12:43.802017 Oct 04 08:40:12.46
25092017 Oct 05 04:40:12.462017 Oct 07 00:07:36.08
25102017 Oct 07 20:07:36.082017 Oct 09 15:34:49.25
25112017 Oct 10 11:34:49.252017 Oct 12 07:02:13.64
25122017 Oct 13 03:02:13.642017 Oct 14 22:30:17.96
25132017 Oct 15 18:30:17.962017 Oct 17 13:58:56.89
25142017 Oct 18 09:58:56.892017 Oct 20 05:27:43.60
25152017 Oct 21 01:27:43.602017 Oct 22 20:56:09.00
25162017 Oct 23 16:56:09.002017 Oct 25 12:24:11.22
25172017 Oct 26 08:24:11.222017 Oct 28 03:51:57.00
25182017 Oct 28 23:51:57.002017 Oct 30 19:19:34.19
25192017 Oct 31 15:19:34.192017 Nov 02 10:46:58.58
25202017 Nov 03 06:46:58.582017 Nov 05 02:14:07.86
25212017 Nov 05 22:14:07.862017 Nov 07 17:41:16.00
25222017 Nov 08 13:41:16.002017 Nov 10 09:09:02.57
25232017 Nov 11 05:09:02.572017 Nov 13 00:37:32.91
25242017 Nov 13 20:37:32.912017 Nov 15 16:06:17.11
25252017 Nov 16 12:06:17.112017 Nov 18 07:34:42.17
25262017 Nov 19 03:34:42.172017 Nov 20 23:02:43.28
25272017 Nov 21 19:02:43.282017 Nov 23 14:30:28.79
25282017 Nov 24 10:30:28.792017 Nov 26 05:58:04.17
25292017 Nov 27 01:58:04.172017 Nov 28 21:25:30.12
25302017 Nov 29 17:25:30.122017 Dec 01 12:52:39.73
25312017 Dec 02 08:52:39.732017 Dec 04 04:19:35.30
25322017 Dec 05 00:19:35.302017 Dec 06 19:46:56.03
25332017 Dec 07 15:46:56.032017 Dec 09 11:15:07.40
25342017 Dec 10 07:15:07.402017 Dec 12 02:43:38.91
25352017 Dec 12 22:43:38.912017 Dec 14 18:12:04.25
25362017 Dec 15 14:12:04.252017 Dec 17 09:40:05.49
25372017 Dec 18 05:40:05.492017 Dec 20 01:07:43.74
25382017 Dec 20 21:07:43.742017 Dec 22 16:35:19.05
25392017 Dec 23 12:35:19.052017 Dec 25 08:02:48.56
25402017 Dec 26 04:02:48.562017 Dec 27 23:30:01.49
25412017 Dec 28 19:30:01.492017 Dec 30 14:57:01.47
25422017 Dec 31 10:57:01.472018 Jan 02 06:24:04.32
25432018 Jan 03 02:24:04.322018 Jan 04 21:51:53.57
25442018 Jan 05 17:51:53.572018 Jan 07 13:20:24.24
25452018 Jan 08 09:20:24.242018 Jan 10 04:48:49.81
25462018 Jan 11 00:48:49.812018 Jan 12 20:16:50.71
25472018 Jan 13 16:16:50.712018 Jan 15 11:44:36.13
25482018 Jan 16 07:44:36.132018 Jan 18 03:12:11.58
25492018 Jan 18 23:12:11.582018 Jan 20 18:39:41.38
25502018 Jan 21 14:39:41.382018 Jan 23 10:07:06.67
25512018 Jan 24 06:07:06.672018 Jan 26 01:34:16.12
25522018 Jan 26 21:34:16.122018 Jan 28 17:01:20.73
25532018 Jan 29 13:01:20.732018 Jan 31 08:28:56.57
25542018 Feb 01 04:28:56.572018 Feb 02 23:57:21.07
25552018 Feb 03 19:57:21.072018 Feb 05 15:25:55.98
25562018 Feb 06 11:25:55.982018 Feb 08 06:54:07.92
25572018 Feb 09 02:54:07.922018 Feb 10 22:21:56.16
25582018 Feb 11 18:21:56.162018 Feb 13 13:49:40.31
25592018 Feb 14 09:49:40.312018 Feb 16 05:17:20.16
25602018 Feb 17 01:17:20.162018 Feb 18 20:44:53.44
25612018 Feb 19 16:44:53.442018 Feb 21 12:12:14.84
25622018 Feb 22 08:12:14.842018 Feb 24 03:39:30.10
25632018 Feb 24 23:39:30.102018 Feb 26 19:07:02.40
25642018 Feb 27 15:07:02.402018 Mar 01 10:35:23.28
25652018 Mar 02 06:35:23.282018 Mar 04 02:04:09.17
25662018 Mar 04 22:04:09.172018 Mar 06 17:32:33.21
25672018 Mar 07 13:32:33.212018 Mar 09 09:00:33.62
25682018 Mar 10 05:00:33.622018 Mar 12 00:28:22.52
25692018 Mar 12 20:28:22.522018 Mar 14 15:56:06.34
25702018 Mar 15 11:56:06.342018 Mar 17 07:23:47.25
25712018 Mar 18 03:23:47.252018 Mar 19 22:51:15.27
25722018 Mar 20 18:51:15.272018 Mar 22 14:18:33.34
25732018 Mar 23 10:18:33.342018 Mar 25 05:46:06.64
25742018 Mar 26 01:46:06.642018 Mar 27 21:14:17.36
25752018 Mar 28 17:14:17.362018 Mar 30 12:42:58.02
25762018 Mar 31 08:42:58.022018 Apr 02 04:11:35.80
25772018 Apr 03 00:11:35.802018 Apr 04 19:39:41.16
25782018 Apr 05 15:39:41.162018 Apr 07 11:07:30.56
25792018 Apr 08 07:07:30.562018 Apr 10 02:35:15.81
25802018 Apr 10 22:35:15.812018 Apr 12 18:02:59.49
25812018 Apr 13 14:02:59.492018 Apr 15 09:30:26.52
25822018 Apr 16 05:30:26.522018 Apr 18 00:57:42.13
25832018 Apr 18 20:57:42.132018 Apr 20 16:25:04.59
25842018 Apr 21 12:25:04.592018 Apr 23 07:53:01.28
25852018 Apr 24 03:53:01.282018 Apr 25 23:21:37.97
25862018 Apr 26 19:21:37.972018 Apr 28 14:50:17.53
25872018 Apr 29 10:50:17.532018 May 01 06:18:27.97
25882018 May 02 02:18:27.972018 May 03 21:46:17.16
25892018 May 04 17:46:17.162018 May 06 13:13:59.83
25902018 May 07 09:13:59.832018 May 09 04:41:38.52
25912018 May 10 00:41:38.522018 May 11 20:09:10.42
25922018 May 12 16:09:10.422018 May 14 11:36:21.64
25932018 May 15 07:36:21.642018 May 17 03:03:28.71
25942018 May 17 23:03:28.712018 May 19 18:31:07.70
25952018 May 20 14:31:07.702018 May 22 09:59:30.38
25962018 May 23 05:59:30.382018 May 25 01:28:08.37
25972018 May 25 21:28:08.372018 May 27 16:56:23.72
25982018 May 28 12:56:23.722018 May 30 08:24:12.02
25992018 May 31 04:24:12.022018 Jun 01 23:51:48.24
26002018 Jun 02 19:51:48.242018 Jun 04 15:19:29.24
26012018 Jun 05 11:19:29.242018 Jun 07 06:47:03.50
26022018 Jun 08 02:47:03.502018 Jun 09 22:14:18.62
26032018 Jun 10 18:14:18.622018 Jun 12 13:41:20.11
26042018 Jun 13 09:41:20.112018 Jun 15 05:08:39.40
26052018 Jun 16 01:08:39.402018 Jun 17 20:36:50.42
26062018 Jun 18 16:36:50.422018 Jun 20 12:05:29.32
26072018 Jun 21 08:05:29.322018 Jun 23 03:33:48.73
26082018 Jun 23 23:33:48.732018 Jun 25 19:01:41.34
26092018 Jun 26 15:01:41.342018 Jun 28 10:29:21.60
26102018 Jun 29 06:29:21.602018 Jul 01 01:57:02.29
26112018 Jul 01 21:57:02.292018 Jul 03 17:24:44.92
26122018 Jul 04 13:24:44.922018 Jul 06 08:52:14.04
26132018 Jul 07 04:52:14.042018 Jul 09 00:19:25.84
26142018 Jul 09 20:19:25.842018 Jul 11 15:46:41.16
26152018 Jul 12 11:46:41.162018 Jul 14 07:14:36.27
26162018 Jul 15 03:14:36.272018 Jul 16 22:43:12.19
26172018 Jul 17 18:43:12.192018 Jul 19 14:11:44.84
26182018 Jul 20 10:11:44.842018 Jul 22 05:39:44.35
26192018 Jul 23 01:39:44.352018 Jul 24 21:07:27.98
26202018 Jul 25 17:07:27.982018 Jul 27 12:35:14.03
26212018 Jul 28 08:35:14.032018 Jul 30 04:03:04.17
26222018 Jul 31 00:03:04.172018 Aug 01 19:30:42.63
26232018 Aug 02 15:30:42.632018 Aug 04 10:58:09.36
26242018 Aug 05 06:58:09.362018 Aug 07 02:25:31.79
26252018 Aug 07 22:25:31.792018 Aug 09 17:53:15.44
26262018 Aug 10 13:53:15.442018 Aug 12 09:21:51.29
26272018 Aug 13 05:21:51.292018 Aug 15 00:50:36.79
26282018 Aug 15 20:50:36.792018 Aug 17 16:18:47.28
26292018 Aug 18 12:18:47.282018 Aug 20 07:46:38.53
26302018 Aug 21 03:46:38.532018 Aug 22 23:14:27.50
26312018 Aug 23 19:14:27.502018 Aug 25 14:42:18.25
26322018 Aug 26 10:42:18.252018 Aug 28 06:10:08.85
26332018 Aug 29 02:10:08.852018 Aug 30 21:37:42.88
26342018 Aug 31 17:37:42.882018 Sep 02 13:05:12.19
26352018 Sep 03 09:05:12.192018 Sep 05 04:32:54.78
26362018 Sep 06 00:32:54.782018 Sep 07 20:01:17.21
26372018 Sep 08 16:01:17.212018 Sep 10 11:30:10.47
26382018 Sep 11 07:30:10.472018 Sep 13 02:58:36.01
26392018 Sep 13 22:58:36.012018 Sep 15 18:26:28.30
26402018 Sep 16 14:26:28.302018 Sep 18 09:54:11.83
26412018 Sep 19 05:54:11.832018 Sep 21 01:22:03.75
26422018 Sep 21 21:22:03.752018 Sep 23 16:49:53.63
26432018 Sep 24 12:49:53.632018 Sep 26 08:17:27.16
26442018 Sep 27 04:17:27.162018 Sep 28 23:44:53.73
26452018 Sep 29 19:44:53.732018 Oct 01 15:12:28.49
26462018 Oct 02 11:12:28.492018 Oct 04 06:40:35.62
26472018 Oct 05 02:40:35.622018 Oct 06 22:09:21.52
26482018 Oct 07 18:09:21.522018 Oct 09 13:37:53.86
26492018 Oct 10 09:37:53.862018 Oct 12 05:05:47.38
26502018 Oct 13 01:05:47.382018 Oct 14 20:33:23.81
26512018 Oct 15 16:33:23.812018 Oct 17 12:01:05.02
26522018 Oct 18 08:01:05.022018 Oct 20 03:28:51.97
26532018 Oct 20 23:28:51.972018 Oct 22 18:56:25.02
26542018 Oct 23 14:56:25.022018 Oct 25 10:23:43.20
26552018 Oct 26 06:23:43.202018 Oct 28 01:51:02.49
26562018 Oct 28 21:51:02.492018 Oct 30 17:18:55.84
26572018 Oct 31 13:18:55.842018 Nov 02 08:47:27.58
26582018 Nov 03 04:47:27.582018 Nov 05 00:16:00.35
26592018 Nov 05 20:16:00.352018 Nov 07 15:44:01.56
26602018 Nov 08 11:44:01.562018 Nov 10 07:11:29.91
26612018 Nov 11 03:11:29.912018 Nov 12 22:38:57.37
26622018 Nov 13 18:38:57.372018 Nov 15 14:06:38.83
26632018 Nov 16 10:06:38.832018 Nov 18 05:34:08.53
26642018 Nov 19 01:34:08.532018 Nov 20 20:57:36.51
26652018 Nov 21 16:57:36.512018 Nov 23 12:28:29.92
26662018 Nov 24 08:28:29.922018 Nov 26 03:56:01.50
26672018 Nov 26 23:56:01.502018 Nov 28 19:24:20.37
26682018 Nov 29 15:24:20.372018 Dec 01 10:52:54.12
26692018 Dec 02 06:52:54.122018 Dec 04 02:21:01.78
26702018 Dec 04 22:21:01.782018 Dec 06 17:48:32.49
26712018 Dec 07 13:48:32.492018 Dec 09 09:15:57.55
26722018 Dec 10 05:15:57.552018 Dec 12 00:43:35.90
26732018 Dec 12 20:43:35.902018 Dec 14 16:11:11.92
26742018 Dec 15 12:11:11.922018 Dec 17 07:38:32.49
26752018 Dec 18 03:38:32.492018 Dec 19 23:05:44.29
26762018 Dec 20 19:05:44.292018 Dec 22 14:33:05.57
26772018 Dec 23 10:33:05.572018 Dec 25 06:01:12.43
26782018 Dec 26 02:01:12.432018 Dec 27 21:29:54.46
26792018 Dec 28 17:29:54.462018 Dec 30 12:58:14.60
26802018 Dec 31 08:58:14.602019 Jan 02 04:26:00.08
26812019 Jan 03 00:26:00.082019 Jan 04 19:53:29.66
26822019 Jan 05 15:53:29.662019 Jan 07 11:21:12.10
26832019 Jan 08 07:21:12.102019 Jan 10 02:49:00.48
26842019 Jan 10 22:49:00.482019 Jan 12 18:16:36.09
26852019 Jan 13 14:16:36.092019 Jan 15 09:44:01.95
26862019 Jan 16 05:44:01.952019 Jan 18 01:11:26.45
26872019 Jan 18 21:11:26.452019 Jan 20 16:39:22.36
26882019 Jan 21 12:39:22.362019 Jan 23 08:08:09.83
26892019 Jan 24 04:08:09.832019 Jan 25 23:36:46.49
26902019 Jan 26 19:36:46.492019 Jan 28 15:04:47.60
26912019 Jan 29 11:04:47.602019 Jan 31 06:32:23.02
26922019 Feb 01 02:32:23.022019 Feb 02 22:00:11.50
26932019 Feb 03 18:00:11.502019 Feb 05 13:28:06.50
26942019 Feb 06 09:28:06.502019 Feb 08 04:55:56.26
26952019 Feb 09 00:55:56.262019 Feb 10 20:23:34.99
26962019 Feb 11 16:23:34.992019 Feb 13 11:51:08.10
26972019 Feb 14 07:51:08.102019 Feb 16 03:19:01.12
26982019 Feb 16 23:19:01.122019 Feb 18 18:47:40.77
26992019 Feb 19 14:47:40.772019 Feb 21 10:16:35.61
27002019 Feb 22 06:16:35.612019 Feb 24 01:44:50.65
27012019 Feb 24 21:44:50.652019 Feb 26 17:12:28.46
27022019 Feb 27 13:12:28.462019 Mar 01 08:40:09.57
27032019 Mar 02 04:40:09.572019 Mar 04 00:08:10.13
27042019 Mar 04 20:08:10.132019 Mar 06 15:36:04.75
27052019 Mar 07 11:36:04.752019 Mar 09 07:03:44.37
27062019 Mar 10 03:03:44.372019 Mar 11 22:31:15.84
27072019 Mar 12 18:31:15.842019 Mar 14 13:59:01.11
27082019 Mar 15 09:59:01.112019 Mar 17 05:27:23.37
27092019 Mar 18 01:27:23.372019 Mar 19 20:56:16.46
27102019 Mar 20 16:56:16.462019 Mar 22 12:24:44.92
27112019 Mar 23 08:24:44.922019 Mar 25 03:52:19.82
27122019 Mar 25 23:52:19.822019 Mar 27 19:19:47.88
27132019 Mar 28 15:19:47.882019 Mar 30 10:47:35.17
27142019 Mar 31 06:47:35.172019 Apr 02 02:15:23.70

Last modified: 12/16/16



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