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
2024-09-25 08:14:11 C 21 16 16.397 -17 29 37.19 – X F51
2024-09-25 08:17:54 C 21 16 16.304 -17 29 37.40 – X F51
2024-09-30 06:26:42 C 21 13 32.998 -17 34 58.00 – X F51
2024-09-30 06:41:46 C 21 13 32.680 -17 34 58.79 – X F51
2024-09-30 06:56:52 C 21 13 32.355 -17 34 58.96 – X F51
2024-09-30 07:11:58 C 21 13 32.018 -17 34 59.75 – X F51
2024-10-06 06:54:41 C 21 11 00.212 -17 38 11.97 – X F51
2024-10-06 07:09:29 C 21 10 59.980 -17 38 12.06 – X F51
2024-10-06 07:23:54 C 21 10 59.765 -17 38 12.18 – X F51
2024-10-06 07:38:24 C 21 10 59.534 -17 38 12.42 – X F51
2025-06-29 01:05:07 C 23 41 53.65 -00 08 29.7 – q 215
2025-06-29 01:08:51 C 23 41 53.57 -00 08 29.4 – q 215
2025-07-11 05:30:18 C 23 40 17.204 -00 04 55.71 – W X05
2025-07-11 06:10:01 C 23 40 16.802 -00 04 56.19 – W X05
2025-07-11 06:10:41 C 23 40 16.796 -00 04 56.23 – W X05
2025-07-11 06:16:58 C 23 40 16.729 -00 04 56.32 – W X05
2025-07-11 06:17:38 C 23 40 16.727 -00 04 56.30 – W X05
2025-07-12 06:52:32 C 23 40 01.819 -00 05 19.71 – W X05
2025-07-12 07:25:22 C 23 40 01.453 -00 05 20.27 – W X05
2025-07-13 07:15:20 C 23 39 45.971 -00 05 49.30 – W X05
2025-07-13 07:49:15 C 23 39 45.571 -00 05 50.09 – W X05
2025-07-18 06:40:56 C 23 38 12.975 -00 09 49.78 – W X05
2025-07-18 06:42:58 C 23 38 12.944 -00 09 49.85 – W X05
2025-07-18 07:20:10 C 23 38 12.368 -00 09 51.50 – W X05
2025-07-18 07:20:50 C 23 38 12.360 -00 09 51.52 – W X05
2025-07-18 07:38:08 C 23 38 12.093 -00 09 52.33 – W X05
2025-07-18 07:38:48 C 23 38 12.084 -00 09 52.37 – W X05
2025-07-19 06:54:20 C 23 37 50.936 -00 10 58.10 – W X05
2025-07-19 06:55:38 C 23 37 50.916 -00 10 58.16 – W X05
2025-07-19 07:32:44 C 23 37 50.317 -00 10 59.99 – W X05
2025-07-20 06:08:54 C 23 37 28.814 -00 12 09.97 – W X05
2025-07-20 06:37:02 C 23 37 28.342 -00 12 11.44 – W X05
2025-07-21 06:08:52 C 23 37 04.906 -00 13 30.66 – W X05
2025-07-21 06:16:52 C 23 37 04.766 -00 13 31.12 – W X05
2025-07-21 06:58:09 C 23 37 04.041 -00 13 33.55 – W X05
2025-07-21 13:38:32 C 23 36 57.154 -00 13 59.30 – X F52
2025-07-21 13:52:17 C 23 36 56.915 -00 14 00.11 – X F52
2025-07-21 14:06:03 C 23 36 56.662 -00 14 01.06 – X F52
2025-07-25 13:48:22 C 23 35 09.442 -00 20 37.51 – X F52
2025-07-25 14:04:11 C 23 35 09.116 -00 20 38.82 – X F52
2025-07-25 14:35:48 C 23 35 08.458 -00 20 41.23 – X F52
2025-07-27 00:16:00 C 23 34 26.76 -00 23 26.9 – V 094
2025-07-27 00:20:37 C 23 34 26.69 -00 23 27.2 – V 094
2025-07-27 00:25:11 C 23 34 26.58 -00 23 27.7 – V 094
2025-07-27 00:29:47 C 23 34 26.47 -00 23 28.0 – V 094
2025-07-27 12:23:04 C 23 34 11.277 -00 24 28.59 – X F52
2025-07-27 12:41:44 C 23 34 10.866 -00 24 30.19 – X F52
2025-07-27 13:00:22 C 23 34 10.447 -00 24 31.81 – X F52
2025-07-27 13:19:07 C 23 34 10.034 -00 24 33.45 – X F52
2025-08-16 17:07:25 C 23 20 27.22 -01 28 05.4 – V D29
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)