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
2017-01-01 10:06:28 C 23 02 14.06 +04 08 13.4 – o 372
2017-01-01 10:15:23 C 23 02 14.28 +04 08 14.4 – q Q11
2017-01-01 10:19:17 C 23 02 14.44 +04 08 14.8 – o 372
2017-01-01 10:23:32 C 23 02 14.51 +04 08 14.7 – q Q11
2017-01-01 10:33:17 C 23 02 14.85 +04 08 15.7 – o 372
2017-01-01 10:33:27 C 23 02 14.84 +04 08 15.2 – m 349
2017-01-01 10:46:31 C 23 02 15.25 +04 08 16.3 – m 349
2017-01-01 11:31:57 C 23 02 16.69 +04 08 19.5 – u 367
2017-01-01 11:36:02 C 23 02 16.83 +04 08 20.1 – u 367
2017-01-01 11:40:07 C 23 02 16.96 +04 08 21.3 – u 367
2017-01-01 17:59:15 C 23 02 29.41 +04 08 51.1 – q I81
2017-01-01 18:05:42 C 23 02 29.61 +04 08 51.5 – q I81
2017-01-01 18:11:33 C 23 02 29.78 +04 08 51.9 – q I81
2017-01-01 18:56:51 C 23 02 31.14 +04 08 57.0 – Q C35
2017-01-01 19:13:41 C 23 02 31.65 +04 08 58.9 – Q C35
2017-01-02 18:49:03 C 23 03 18.40 +04 11 02.1 – q K02
2017-01-02 19:01:45 C 23 03 18.79 +04 11 04.1 – q K02
2017-01-03 17:36:40 C 23 04 04.89 +04 13 15.2 – q A77
2017-01-03 18:09:20 C 23 04 06.03 +04 13 18.6 – o 107
2017-01-03 18:27:26 C 23 04 06.63 +04 13 21.4 – q 160
2017-01-03 18:28:39 C 23 04 06.69 +04 13 21.2 – q A77
2017-01-03 18:31:26 C 23 04 06.88 +04 13 21.9 – q 160
2017-01-03 18:35:26 C 23 04 06.98 +04 13 21.6 – q 160
2017-01-03 18:44:28 C 23 04 07.22 +04 13 22.1 – o 107
2017-01-03 19:19:37 C 23 04 08.35 +04 13 24.9 – o 107
2017-01-06 09:06:25 C 23 06 22.17 +04 20 19.2 – q D95
2017-01-06 09:11:04 C 23 06 22.29 +04 20 18.3 – q D95
2017-01-06 09:20:21 C 23 06 22.68 +04 20 19.8 – q D95
2017-01-06 17:37:53 C 23 06 41.45 +04 21 20.5 – q C23
2017-01-06 17:44:07 C 23 06 41.69 +04 21 20.5 – q C23
2017-01-06 17:51:43 C 23 06 41.90 +04 21 20.8 – q B53
2017-01-06 18:06:14 C 23 06 42.47 +04 21 24.5 – q B53
2017-01-06 18:17:56 C 23 06 42.89 +04 21 26.1 – q B53
2017-01-06 18:28:31 C 23 06 43.32 +04 21 26.3 – q 215
2017-01-06 18:30:13 C 23 06 43.37 +04 21 26.8 – q 160
2017-01-06 18:30:23 C 23 06 43.41 +04 21 26.6 – q 215
2017-01-06 18:32:13 C 23 06 43.49 +04 21 26.9 – q 215
2017-01-06 18:33:46 C 23 06 43.53 +04 21 27.1 – q 160
2017-01-06 18:37:17 C 23 06 43.65 +04 21 27.7 – q 160
2017-01-08 00:53:01 C 23 07 53.67 +04 25 23.0 – q H45
2017-01-08 00:55:36 C 23 07 53.75 +04 25 23.5 – q H45
2017-01-08 00:58:38 C 23 07 53.90 +04 25 23.7 – q H45
2017-01-08 01:00:21 C 23 07 53.93 +04 25 23.8 – q H45
2017-01-08 01:02:28 C 23 07 53.99 +04 25 24.0 – q H45
2017-01-08 18:07:22 C 23 08 34.65 +04 27 43.6 – q 160
2017-01-08 18:10:22 C 23 08 34.74 +04 27 44.4 – q 160
2017-01-08 18:13:21 C 23 08 34.85 +04 27 44.7 – q 160
2017-01-09 00:52:57 C 23 08 50.91 +04 28 40.8 – q H45
2017-01-09 00:55:24 C 23 08 50.98 +04 28 41.6 – q H45
2017-01-09 00:57:12 C 23 08 51.07 +04 28 41.8 – q H45
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)