| Ephemeris for C/2021 A1 (Leonard) | ||||||||||
| Date | Time | Right Ascension | Declination | Rise | Culm | Set | Approx Mag. | Constellation | ||
| 2021 | Dec | 06 | 19:00 EST | 14h37m24s | +22°31'10" | 01:46 | 09:19 | 16:51 | 5.9 | Bootes |
| 2021 | Dec | 06 | 20:00 EST | 14h38m12s | +22°25'17" | 01:48 | 09:20 | 16:52 | 5.9 | Bootes |
| 2021 | Dec | 06 | 21:00 EST | 14h39m00s | +22°19'21" | 01:49 | 09:21 | 16:52 | 5.9 | Bootes |
| 2021 | Dec | 06 | 22:00 EST | 14h39m49s | +22°13'21" | 01:50 | 09:21 | 16:53 | 5.9 | Bootes |
| 2021 | Dec | 06 | 23:00 EST | 14h40m38s | +22°07'18" | 01:52 | 09:22 | 16:53 | 5.9 | Bootes |
| 2021 | Dec | 07 | 00:00 EST | 14h41m27s | +22°01'10" | 01:49 | 09:19 | 16:49 | 5.9 | Bootes |
| 2021 | Dec | 07 | 01:00 EST | 14h42m16s | +21°54'59" | 01:50 | 09:20 | 16:50 | 5.9 | Bootes |
| 2021 | Dec | 07 | 02:00 EST | 14h43m06s | +21°48'45" | 01:51 | 09:21 | 16:50 | 5.9 | Bootes |
| 2021 | Dec | 07 | 03:00 EST | 14h43m56s | +21°42'26" | 01:53 | 09:22 | 16:50 | 5.9 | Bootes |
| 2021 | Dec | 07 | 04:00 EST | 14h44m46s | +21°36'04" | 01:54 | 09:22 | 16:51 | 5.9 | Bootes |
| 2021 | Dec | 07 | 05:00 EST | 14h45m37s | +21°29'38" | 01:55 | 09:23 | 16:51 | 5.9 | Bootes |
| 2021 | Dec | 07 | 06:00 EST | 14h46m28s | +21°23'07" | 01:57 | 09:24 | 16:51 | 5.9 | Bootes |
| 2021 | Dec | 07 | 07:00 EST | 14h47m19s | +21°16'33" | 01:58 | 09:25 | 16:52 | 5.9 | Bootes |
| 2021 | Dec | 07 | 08:00 EST | 14h48m10s | +21°09'55" | 01:59 | 09:26 | 16:52 | 5.9 | Bootes |
| 2021 | Dec | 07 | 09:00 EST | 14h49m02s | +21°03'13" | 02:01 | 09:27 | 16:52 | 5.8 | Bootes |
| 2021 | Dec | 07 | 10:00 EST | 14h49m54s | +20°56'27" | 02:02 | 09:28 | 16:53 | 5.8 | Bootes |
| 2021 | Dec | 07 | 11:00 EST | 14h50m47s | +20°49'37" | 02:04 | 09:28 | 16:53 | 5.8 | Bootes |
| 2021 | Dec | 07 | 12:00 EST | 14h51m39s | +20°42'43" | 02:05 | 09:29 | 16:53 | 5.8 | Bootes |
| 2021 | Dec | 07 | 13:00 EST | 14h52m32s | +20°35'44" | 02:06 | 09:30 | 16:54 | 5.8 | Bootes |
| 2021 | Dec | 07 | 14:00 EST | 14h53m26s | +20°28'41" | 02:08 | 09:31 | 16:54 | 5.8 | Bootes |
| 2021 | Dec | 07 | 15:00 EST | 14h54m19s | +20°21'35" | 02:09 | 09:32 | 16:55 | 5.8 | Bootes |
| 2021 | Dec | 07 | 16:00 EST | 14h55m13s | +20°14'24" | 02:11 | 09:33 | 16:55 | 5.8 | Bootes |
| 2021 | Dec | 07 | 17:00 EST | 14h56m07s | +20°07'08" | 02:12 | 09:34 | 16:55 | 5.8 | Bootes |
| 2021 | Dec | 07 | 18:00 EST | 14h57m02s | +19°59'48" | 02:14 | 09:35 | 16:56 | 5.8 | Bootes |
| 2021 | Dec | 07 | 19:00 EST | 14h57m57s | +19°52'24" | 02:15 | 09:36 | 16:56 | 5.8 | Bootes |
|
All times computed for Cambridge (latitude 42.38; longitude -71.11) and expressed in Cambridge time. Ephemeris by Dominic Ford – https://in-the-sky.org/ephemeris.php | ||||||||||