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
2017-01-20 18:15:44 C 23 21 48.89 +05 19 33.2 – q C23
2017-01-20 18:25:24 C 23 21 49.35 +05 19 35.8 – q I81
2017-01-20 18:37:42 C 23 21 49.96 +05 19 38.3 – q I81
2017-01-20 18:45:54 C 23 21 50.44 +05 19 40.2 – q I81
2017-01-21 01:08:30 C 23 22 10.14 +05 21 03.9 – q H45
2017-01-21 01:11:26 C 23 22 10.25 +05 21 04.6 – q H45
2017-01-21 01:13:22 C 23 22 10.41 +05 21 05.0 – q H45
2017-01-21 01:15:29 C 23 22 10.51 +05 21 05.6 – q H45
2017-01-21 01:17:49 C 23 22 10.61 +05 21 05.9 – q H45
2017-01-21 01:19:42 C 23 22 10.70 +05 21 06.3 – q H45
2017-01-21 09:49:51 C 23 22 37.29 +05 22 57.9 – m 349
2017-01-21 09:55:20 C 23 22 37.59 +05 22 59.3 – q Q11
2017-01-21 10:03:52 C 23 22 38.02 +05 23 00.9 – q Q11
2017-01-21 10:08:26 C 23 22 38.26 +05 23 02.1 – q Q11
2017-01-21 10:12:01 C 23 22 38.41 +05 23 02.5 – m 349
2017-01-21 17:28:33 C 23 23 01.26 +05 24 40.5 – u 107
2017-01-21 17:40:17 C 23 23 01.98 +05 24 40.6 – q C23
2017-01-21 17:45:00 C 23 23 02.39 +05 24 41.4 – Q B96
2017-01-21 17:47:22 C 23 23 02.33 +05 24 43.5 – u 107
2017-01-21 17:47:22 C 23 23 02.49 +05 24 41.9 – Q B96
2017-01-21 17:48:36 C 23 23 02.47 +05 24 42.7 – q C23
2017-01-21 17:49:43 C 23 23 02.63 +05 24 42.3 – Q B96
2017-01-21 17:52:03 C 23 23 02.72 +05 24 42.7 – Q B96
2017-01-21 17:54:24 C 23 23 02.88 +05 24 43.9 – Q B96
2017-01-21 17:55:45 C 23 23 02.91 +05 24 44.1 – U A77
2017-01-21 17:56:47 C 23 23 03.02 +05 24 44.6 – Q B96
2017-01-21 18:06:09 C 23 23 03.38 +05 24 46.3 – u 107
2017-01-21 18:07:18 C 23 23 03.48 +05 24 46.7 – q C23
2017-01-21 18:07:52 C 23 23 03.52 +05 24 46.8 – U A77
2017-01-21 18:22:51 C 23 23 04.28 +05 24 51.0 – U A77
2017-01-21 18:26:02 C 23 23 04.48 +05 24 51.1 – q I81
2017-01-21 18:33:59 C 23 23 04.83 +05 24 52.3 – U A77
2017-01-21 18:37:24 C 23 23 04.88 +05 24 53.7 – w J01
2017-01-21 18:40:22 C 23 23 05.19 +05 24 54.7 – q I81
2017-01-21 18:42:39 C 23 23 05.24 +05 24 55.9 – w J01
2017-01-21 18:43:03 C 23 23 05.31 +05 24 54.4 – U A77
2017-01-21 18:53:07 C 23 23 05.61 +05 24 57.9 – w J01
2017-01-21 19:05:52 C 23 23 06.59 +05 24 59.6 – q I81
2017-01-22 17:52:31 C 23 24 19.16 +05 30 05.6 – c B96
2017-01-22 17:54:53 C 23 24 19.28 +05 30 06.6 – c B96
2017-01-22 17:57:13 C 23 24 19.36 +05 30 06.9 – c B96
2017-01-22 18:01:54 C 23 24 19.65 +05 30 08.2 – c B96
2017-01-22 18:04:15 C 23 24 19.76 +05 30 07.6 – c B96
2017-01-22 18:06:35 C 23 24 19.86 +05 30 08.1 – c B96
2017-01-23 05:06:31 C 23 24 54.87 +05 32 42.1 – L T05
2017-01-23 05:11:34 C 23 24 55.17 +05 32 42.4 – L T05
2017-01-23 05:21:39 C 23 24 55.72 +05 32 45.1 – L T05
2017-01-23 05:33:54 C 23 24 56.32 +05 32 47.6 – L T05
2017-01-23 09:33:29 C 23 25 09.49 +05 33 40.4 – m 372
2017-01-23 09:38:45 C 23 25 09.73 +05 33 41.6 – q Q11
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)