| Ephemeris for 21P/Giacobini-Zinner | |||||||||||
| Date | Age of | Right | Declination | Rise | Culm | Set | Approx | Observable | Constellation | ||
| Moon | Ascension | Mag. | (hover mouse) | ||||||||
| 2018 | Sep | 11 | 02 days | 05h56m49s | +30°16'58" | 23:44 | 07:44 | 15:41 | 8.0 | 02:04 until 05:44 | Auriga |
| 2018 | Sep | 13 | 03 days | 06h00m49s | +28°30'56" | 23:52 | 07:45 | 15:33 | 8.0 | 02:09 until 05:45 | Auriga |
| 2018 | Sep | 14 | 04 days | 06h04m39s | +26°44'55" | 00:04 | 07:44 | 15:25 | 8.0 | 02:15 until 05:46 | Gemini |
| 2018 | Sep | 15 | 05 days | 06h08m20s | +24°59'10" | 00:12 | 07:44 | 15:17 | 8.0 | 02:20 until 05:47 | Gemini |
| 2018 | Sep | 16 | 06 days | 06h11m54s | +23°13'53" | 00:19 | 07:44 | 15:09 | 8.0 | 02:25 until 05:48 | Gemini |
| 2018 | Sep | 17 | 07 days | 06h15m19s | +21°29'18" | 00:25 | 07:43 | 15:01 | 8.0 | 02:29 until 05:49 | Gemini |
| 2018 | Sep | 18 | 08 days | 06h18m37s | +19°45'36" | 00:32 | 07:43 | 14:54 | 8.0 | 02:34 until 05:50 | Orion |
| 2018 | Sep | 19 | 09 days | 06h21m48s | +18°02'58" | 00:37 | 07:42 | 14:46 | 8.0 | 02:38 until 05:51 | Gemini |
| 2018 | Sep | 20 | 10 days | 06h24m53s | +16°21'34" | 00:43 | 07:41 | 14:39 | 8.1 | 02:42 until 05:51 | Orion |
| 2018 | Sep | 21 | 10 days | 06h27m51s | +14°41'33" | 00:48 | 07:40 | 14:32 | 8.1 | 02:46 until 05:52 | Gemini |
| 2018 | Sep | 22 | 11 days | 06h30m42s | +13°03'03" | 00:53 | 07:39 | 14:25 | 8.1 | 02:50 until 05:53 | Gemini |
| 2018 | Sep | 23 | 12 days | 06h33m29s | +11°26'11" | 00:57 | 07:38 | 14:19 | 8.1 | 02:54 until 05:54 | Monoceros |
| 2018 | Sep | 24 | 13 days | 06h36m09s | +09°51'03" | 01:01 | 07:37 | 14:12 | 8.2 | 02:58 until 05:55 | Monoceros |
| 2018 | Sep | 25 | 14 days | 06h38m44s | +08°17'44" | 01:05 | 07:35 | 14:05 | 8.2 | 03:02 until 05:56 | Monoceros |
| 2018 | Sep | 26 | 15 days | 06h41m14s | +06°46'18" | 01:09 | 07:34 | 13:59 | 8.2 | 03:05 until 05:57 | Monoceros |
| 2018 | Sep | 27 | 16 days | 06h43m39s | +05°16'48" | 01:12 | 07:32 | 13:52 | 8.3 | 03:09 until 05:58 | Monoceros |
| 2018 | Sep | 28 | 17 days | 06h45m58s | +03°49'16" | 01:15 | 07:31 | 13:46 | 8.3 | 03:12 until 05:59 | Monoceros |
| 2018 | Sep | 29 | 18 days | 06h48m14s | +02°23'43" | 01:18 | 07:29 | 13:40 | 8.3 | 03:16 until 06:00 | Monoceros |
| 2018 | Sep | 30 | 19 days | 06h50m24s | +01°00'12" | 01:21 | 07:27 | 13:33 | 8.4 | 03:19 until 06:01 | Monoceros |
| 2018 | Oct | 01 | 20 days | 06h52m30s | -00°21'18" | 01:24 | 07:25 | 13:27 | 8.4 | 03:22 until 06:02 | Monoceros |
| 2018 | Oct | 02 | 21 days | 06h54m32s | -01°40'48" | 01:26 | 07:23 | 13:21 | 8.5 | 03:25 until 06:03 | Monoceros |
| 2018 | Oct | 03 | 22 days | 06h56m30s | -02°58'18" | 01:28 | 07:21 | 13:15 | 8.5 | 03:28 until 06:04 | Monoceros |
| 2018 | Oct | 04 | 23 days | 06h58m24s | -04°13'49" | 01:30 | 07:19 | 13:09 | 8.6 | 03:31 until 06:05 | Monoceros |
| 2018 | Oct | 05 | 24 days | 07h00m13s | -05°27'23" | 01:32 | 07:17 | 13:02 | 8.6 | 03:34 until 06:06 | Monoceros |
| 2018 | Oct | 06 | 26 days | 07h01m58s | -06°39'01" | 01:34 | 07:15 | 12:56 | 8.7 | 03:37 until 06:07 | Monoceros |
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All times computed for Ashburn (latitude 39.04; longitude -77.49) and expressed in Ashburn time. Ephemeris by Dominic Ford – https://in-the-sky.org/ephemeris.php | |||||||||||