Encke (2P)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2022-10-03 (JD 2459855.5)
Eccentricity (e)0.8477003353 ± 2.19e-07
Semi-major axis (a)2.2196888070 AU ± 1.36e-07
Inclination (i)11.40704099° ± 2.08e-05
Long. of Asc. Node (Ω)334.18510998° ± 5.54e-05
Arg. of Perihelion (ω)187.14215822° ± 5.56e-05
Mean Anomaly (M)245.50091097° ± 1.14e-05
Mean Motion (n)0.2980340852°/day ± 2.73e-08
Perihelion dist (q)0.33805786 AU ± 4.86e-07
Aphelion dist (Q)4.10131975 AU ± 5.46e-07
Orbital Period3.30709248 yr ± 3.03e-07
Physical Parameters
Diameter4.800 km
Geometric Albedo0.046
Rotation Period11.083 h
Orbit Solution
SourceJPL
Solution Date2026-08-13 12:41:21
RMS Residual0.448″
Uncertainty1
Orbit TypeEncke-type Comet
MOID0.166917 AU
Observations Used645
Oppositions—
Arc Total2018-2026
First Observation Used—
Last Observation Used2026-08-11
Observations (6393)
Date Type RA Dec Mag Band Observatory
2023-09-15 17:27:12 C 08 07 23.93 +31 09 06.2 – q 903
2023-09-15 17:31:05 C 08 07 25.32 +31 09 03.1 – q 903
2023-09-16 02:58:46 C 08 10 49.41 +30 57 22.6 – V C23
2023-09-16 03:01:03 B 08 10 50.292 +30 57 20.02 – V B50
2023-09-16 03:05:54 B 08 10 51.977 +30 57 13.90 – V B50
2023-09-16 03:06:19 C 08 10 52.28 +30 57 14.4 – V C23
2023-09-16 03:10:46 B 08 10 53.623 +30 57 08.21 – V B50
2023-09-16 03:14:56 C 08 10 55.34 +30 57 02.8 – V C23
2023-09-16 05:08:38 C 08 11 36.658 +30 54 43.70 – V G40
2023-09-16 05:17:49 C 08 11 39.955 +30 54 32.18 – V G40
2023-09-16 05:27:41 C 08 11 43.514 +30 54 19.84 – V G40
2023-09-17 02:13:37 B 08 19 13.86 +30 27 00.9 – X M18
2023-09-17 02:23:06 B 08 19 17.53 +30 26 48.2 – X M18
2023-09-17 02:32:40 B 08 19 20.73 +30 26 35.1 – X M18
2023-09-18 04:29:33 C 08 28 46.706 +29 49 39.61 – V G40
2023-09-18 05:36:04 C 08 29 10.913 +29 48 01.12 – V G40
2023-09-18 11:41:58 C 08 31 24.06 +29 38 48.1 – V U94
2023-09-18 11:44:05 C 08 31 24.84 +29 38 44.8 – V U94
2023-09-18 11:46:11 C 08 31 25.59 +29 38 41.5 – V U94
2023-09-18 18:07:22 C 08 33 44.887 +29 28 54.70 – q Q21
2023-09-18 18:14:55 C 08 33 47.645 +29 28 43.36 – q Q21
2023-09-18 19:29:35 C 08 34 14.69 +29 26 49.0 – u 367
2023-09-18 19:32:17 C 08 34 15.67 +29 26 44.7 – u 367
2023-09-19 01:43:52 C 08 36 31.219 +29 16 54.62 – V I81
2023-09-19 01:47:59 C 08 36 32.683 +29 16 48.47 – V I81
2023-09-19 01:52:06 C 08 36 34.166 +29 16 42.02 – V I81
2023-09-19 04:00:36 C 08 37 21.11 +29 13 20.1 – – A77
2023-09-19 04:07:57 C 08 37 23.94 +29 13 08.5 – – A77
2023-09-19 04:15:16 C 08 37 26.68 +29 12 57.4 – – A77
2023-09-20 03:10:58 B 08 45 49.72 +28 35 00.5 – X M18
2023-09-20 03:24:06 B 08 45 54.53 +28 34 37.6 – X M18
2023-09-20 03:37:15 B 08 45 59.34 +28 34 15.6 – X M18
2023-09-20 04:32:28 C 08 46 19.260 +28 32 41.39 – V Z10
2023-09-20 04:43:01 C 08 46 23.052 +28 32 23.46 – V Z10
2023-09-20 04:54:44 C 08 46 27.334 +28 32 03.77 – V Z10
2023-09-21 02:14:09 C 08 54 15.41 +27 54 21.3 – Z G23
2023-09-21 02:22:22 C 08 54 18.06 +27 54 05.7 – V G00
2023-09-21 02:24:24 C 08 54 19.29 +27 54 01.6 – Z G23
2023-09-21 02:31:45 C 08 54 21.50 +27 53 48.6 – V G00
2023-09-21 02:33:38 C 08 54 22.59 +27 53 45.3 – Z G23
2023-09-21 02:40:13 C 08 54 24.52 +27 53 33.1 – V G00
2023-09-21 03:31:39 C 08 54 43.594 +27 52 01.16 – Z 213
2023-09-21 04:00:59 C 08 54 54.319 +27 51 07.92 – Z 213
2023-09-21 04:29:53 C 08 55 04.860 +27 50 15.47 – Z 213
2023-09-23 03:28:11 C 09 12 12.13 +26 19 21.7 – V C23
2023-09-23 03:36:49 C 09 12 15.26 +26 19 03.6 – V C23
2023-09-23 03:44:21 C 09 12 18.23 +26 18 48.8 – V C23
2023-09-23 18:48:23 C 09 17 46.14 +25 47 36.2 – q D95
2023-09-23 18:51:25 C 09 17 47.23 +25 47 29.8 – q D95
2023-09-23 18:52:32 C 09 17 47.69 +25 47 27.6 – q D95
Radar Observations (2)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
1980-11-05 14:44:00 -280334.5 2.5 Hz 2380 -1 -1
1980-11-05.613889 -2803345 10 Hz 2380 251 251
Station codes
-1 Arecibo (305-m, 1963–2020)