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
2016-11-14 20:17:45 C 23 04 00.98 +06 56 17.9 – q 160
2016-11-14 20:21:01 C 23 04 00.75 +06 56 16.0 – q 160
2016-11-15 19:36:51 C 23 03 04.60 +06 47 26.4 – q 160
2016-11-15 19:40:16 C 23 03 04.49 +06 47 24.4 – q 160
2016-11-15 19:43:40 C 23 03 04.36 +06 47 22.8 – q 160
2016-11-16 18:36:49 C 23 02 11.51 +06 38 52.5 – Q 213
2016-11-16 18:43:20 C 23 02 11.27 +06 38 50.2 – Q 213
2016-11-16 18:51:10 C 23 02 10.99 +06 38 47.6 – Q 213
2016-11-16 19:14:28 C 23 02 10.00 +06 38 38.1 – U A77
2016-11-16 19:19:57 C 23 02 09.88 +06 38 37.7 – q Z78
2016-11-16 19:25:58 C 23 02 09.66 +06 38 35.1 – q Z78
2016-11-16 19:32:41 C 23 02 09.38 +06 38 32.9 – q Z78
2016-11-16 19:37:10 C 23 02 09.12 +06 38 29.7 – U A77
2016-11-16 19:59:44 C 23 02 08.23 +06 38 21.5 – U A77
2016-11-17 18:06:14 C 23 01 19.68 +06 30 20.3 – U A77
2016-11-17 18:22:28 C 23 01 19.06 +06 30 14.6 – U A77
2016-11-17 18:44:21 C 23 01 18.39 +06 30 07.9 – q Z78
2016-11-17 18:48:51 C 23 01 18.13 +06 30 05.3 – q Z78
2016-11-17 18:52:09 C 23 01 18.01 +06 30 05.3 – q Z78
2016-11-17 21:19:28 C 23 01 12.56 +06 29 09.9 – q I81
2016-11-17 21:21:31 C 23 01 12.47 +06 29 08.8 – q I81
2016-11-17 21:23:35 C 23 01 12.41 +06 29 08.3 – q I81
2016-11-18 06:09:52 C 23 00 53.909 +06 26 05.52 – L F51
2016-11-18 06:26:21 C 23 00 53.310 +06 25 59.68 – L F51
2016-11-18 06:42:45 C 23 00 52.701 +06 25 53.93 – L F51
2016-11-18 06:59:05 C 23 00 52.101 +06 25 48.09 – L F51
2016-11-19 19:45:52 C 22 59 38.26 +06 13 02.2 – w 212
2016-11-19 20:04:30 C 22 59 37.58 +06 12 55.0 – w 212
2016-11-19 20:25:12 C 22 59 36.92 +06 12 49.5 – w 212
2016-11-20 02:21:26 C 22 59 25.50 +06 10 49.3 – q H47
2016-11-20 02:45:12 C 22 59 24.73 +06 10 41.2 – q H47
2016-11-20 03:04:16 C 22 59 24.06 +06 10 35.4 – q H47
2016-11-20 20:55:20 C 22 58 51.03 +06 04 37.8 – q I81
2016-11-20 21:01:44 C 22 58 50.86 +06 04 34.2 – q I81
2016-11-20 21:03:47 C 22 58 50.84 +06 04 33.4 – q I81
2016-11-22 09:57:29 C 22 57 47.14 +05 52 45.3 – q 372
2016-11-22 10:03:32 C 22 57 46.99 +05 52 43.1 – q 372
2016-11-24 11:01:57 C 22 56 31.83 +05 37 53.4 – q D29
2016-11-24 11:22:19 C 22 56 31.33 +05 37 47.7 – q D29
2016-11-24 11:39:08 C 22 56 30.70 +05 37 49.3 – q Q68
2016-11-24 11:42:41 C 22 56 30.82 +05 37 41.6 – q D29
2016-11-24 11:45:43 C 22 56 30.58 +05 37 47.7 – q Q68
2016-11-24 20:24:36 C 22 56 18.64 +05 35 10.9 – q G40
2016-11-24 20:33:05 C 22 56 18.43 +05 35 08.1 – q G40
2016-11-24 20:45:25 C 22 56 18.13 +05 35 04.6 – q G40
2016-11-24 22:02:21 S 22 56 16.41 +05 34 44.3 – L C51
2016-11-24 23:20:44 C 22 56 14.38 +05 34 18.6 – q J22
2016-11-24 23:26:55 C 22 56 14.24 +05 34 17.7 – q J22
2016-11-24 23:28:57 C 22 56 14.17 +05 34 16.3 – q J22
2016-11-25 01:11:02 S 22 56 12.12 +05 33 49.9 – L C51
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)