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
2016-11-30 19:31:28 C 22 53 46.01 +04 58 19.8 – q 160
2016-11-30 19:35:15 C 22 53 45.95 +04 58 18.8 – q 160
2016-12-01 02:13:56 C 22 53 41.06 +04 56 50.2 – q H45
2016-12-01 02:16:10 C 22 53 41.05 +04 56 49.8 – q H45
2016-12-01 02:17:57 C 22 53 41.00 +04 56 48.9 – q H45
2016-12-01 02:19:19 C 22 53 40.98 +04 56 48.6 – q H45
2016-12-01 02:20:46 C 22 53 40.97 +04 56 48.5 – q H45
2016-12-01 02:22:07 C 22 53 40.93 +04 56 48.4 – q H45
2016-12-02 01:16:43 C 22 53 25.52 +04 51 49.2 – q 850
2016-12-02 01:38:17 C 22 53 25.20 +04 51 44.2 – q 850
2016-12-02 12:15:29 C 22 53 18.67 +04 49 30.6 – u 367
2016-12-02 12:20:09 C 22 53 18.65 +04 49 29.0 – u 367
2016-12-03 17:50:25 C 22 53 03.43 +04 43 31.8 – q A71
2016-12-03 18:03:22 C 22 53 03.32 +04 43 29.9 – q A71
2016-12-03 18:16:18 C 22 53 03.21 +04 43 27.5 – q A71
2016-12-03 18:21:03 C 22 53 03.23 +04 43 25.8 – q C23
2016-12-03 18:27:17 C 22 53 03.14 +04 43 24.9 – q C23
2016-12-03 18:33:31 C 22 53 03.09 +04 43 23.9 – q C23
2016-12-03 18:39:45 C 22 53 03.09 +04 43 23.1 – q C23
2016-12-03 18:45:56 C 22 53 03.17 +04 43 20.6 – c B96
2016-12-03 18:48:18 C 22 53 03.10 +04 43 20.4 – c B96
2016-12-03 18:50:42 C 22 53 02.94 +04 43 20.1 – c B96
2016-12-03 18:53:04 C 22 53 02.85 +04 43 19.2 – c B96
2016-12-03 18:55:28 C 22 53 02.83 +04 43 19.0 – c B96
2016-12-03 18:57:52 C 22 53 02.80 +04 43 18.2 – c B96
2016-12-04 02:59:39 C 22 52 59.13 +04 41 53.8 – q W96
2016-12-04 03:35:18 C 22 52 58.71 +04 41 46.3 – q W96
2016-12-04 16:58:26 C 22 52 54.09 +04 39 09.0 – q C23
2016-12-04 17:02:35 C 22 52 54.04 +04 39 08.3 – q C23
2016-12-04 17:12:59 C 22 52 53.97 +04 39 06.6 – q C23
2016-12-04 17:33:42 C 22 52 53.84 +04 39 02.8 – q C10
2016-12-04 18:32:58 C 22 52 53.32 +04 38 51.9 – q C10
2016-12-04 18:48:34 C 22 52 53.24 +04 38 48.8 – c B96
2016-12-04 18:50:57 C 22 52 53.19 +04 38 48.6 – c B96
2016-12-04 18:53:21 C 22 52 53.18 +04 38 48.4 – c B96
2016-12-04 18:55:43 C 22 52 53.15 +04 38 48.2 – c B96
2016-12-04 18:58:07 C 22 52 53.11 +04 38 47.8 – c B96
2016-12-04 19:00:29 C 22 52 53.10 +04 38 47.2 – c B96
2016-12-06 19:04:59 C 22 52 40.74 +04 30 27.8 – Q J38
2016-12-06 19:15:08 C 22 52 40.71 +04 30 26.4 – Q J38
2016-12-06 19:20:12 C 22 52 40.70 +04 30 25.7 – Q J38
2016-12-10 00:19:54 C 22 52 39.85 +04 19 13.3 – q H47
2016-12-10 01:23:03 C 22 52 39.92 +04 19 05.6 – q H47
2016-12-10 04:50:19 C 22 52 40.271 +04 18 38.33 – U 695
2016-12-10 05:08:32 C 22 52 40.321 +04 18 35.84 – U 695
2016-12-10 11:02:41 C 22 52 41.34 +04 17 52.2 – m 349
2016-12-10 11:24:31 C 22 52 41.43 +04 17 49.0 – m 349
2016-12-12 02:25:22 C 22 52 51.388 +04 13 17.20 – U 695
2016-12-12 02:30:40 C 22 52 51.403 +04 13 16.57 – U 695
2016-12-12 02:36:28 C 22 52 51.427 +04 13 16.02 – U 695
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)