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
2003-10-24 22:32:19 C 00 51 24.56 +42 39 24.3 – r 445
2003-10-24 22:39:12 C 00 51 22.46 +42 39 29.9 – r 445
2003-10-24 22:46:04 C 00 51 20.34 +42 39 35.1 – r 445
2003-10-25 00:08:14 C 00 50 54.92 +42 40 38.8 – c 945
2003-10-25 00:11:57 C 00 50 53.81 +42 40 41.9 – c 945
2003-10-25 00:15:46 C 00 50 52.60 +42 40 44.9 – c 945
2003-10-25 00:19:31 C 00 50 51.46 +42 40 47.7 – c 945
2003-10-25 00:22:48 C 00 50 50.43 +42 40 50.1 – c 945
2003-10-25 00:51:38 C 00 50 41.25 +42 41 08.1 – r 557
2003-10-25 00:53:08 C 00 50 40.78 +42 41 09.2 – r 557
2003-10-25 00:54:38 C 00 50 40.32 +42 41 10.3 – r 557
2003-10-25 00:56:09 C 00 50 39.87 +42 41 11.4 – r 557
2003-10-25 00:57:40 C 00 50 39.35 +42 41 12.7 – r 557
2003-10-25 00:59:11 C 00 50 38.93 +42 41 13.8 – r 557
2003-10-25 01:00:41 C 00 50 38.45 +42 41 15.0 – r 557
2003-10-25 01:13:12 C 00 50 34.68 +42 41 26.9 – c 235
2003-10-25 01:54:13 C 00 50 24.22 +42 42 02.8 – c H41
2003-10-25 01:58:03 C 00 50 23.06 +42 42 05.9 – c H41
2003-10-25 02:01:08 C 00 50 22.10 +42 42 08.3 – c H41
2003-10-25 02:15:31 C 00 50 17.47 +42 42 21.3 – c 850
2003-10-25 03:45:14 C 00 49 49.52 +42 43 33.7 – c 850
2003-10-25 04:54:00 C 00 49 28.05 +42 44 27.2 – c 850
2003-10-25 15:52:19 C 00 46 02.30 +42 52 50.3 – – D70
2003-10-25 19:48:12 C 00 44 48.91 +42 55 42.9 – r A41
2003-10-25 20:19:21 C 00 44 38.84 +42 56 06.1 – r A41
2003-10-25 20:25:48 C 00 44 36.86 +42 56 10.6 – r 130
2003-10-25 20:32:09 C 00 44 34.79 +42 56 15.4 – r 130
2003-10-25 20:38:30 C 00 44 32.72 +42 56 20.3 – r 130
2003-10-25 20:44:52 C 00 44 30.65 +42 56 25.0 – r 130
2003-10-25 20:49:25 C 00 44 29.05 +42 56 28.5 – r A41
2003-10-25 20:51:14 C 00 44 28.59 +42 56 29.8 – r 130
2003-10-25 21:58:03 C 00 44 06.83 +42 57 19.5 – c 204
2003-10-25 22:03:46 C 00 44 04.94 +42 57 23.7 – c 204
2003-10-25 22:10:12 C 00 44 02.84 +42 57 28.5 – c 204
2003-10-25 22:15:55 C 00 44 00.97 +42 57 32.6 – c 204
2003-10-25 22:17:36 C 00 44 00.23 +42 57 35.0 – r A41
2003-10-25 22:22:22 C 00 43 58.87 +42 57 37.2 – c 204
2003-10-25 22:59:24 C 00 43 46.57 +42 58 03.5 – r A41
2003-10-26 07:08:31 C 00 41 07.22 +43 03 57.0 – r H36
2003-10-26 07:10:45 C 00 41 06.46 +43 03 58.5 – r H36
2003-10-26 11:42:30 C 00 39 38.11 +43 07 12.3 – m 379
2003-10-26 11:46:33 C 00 39 36.74 +43 07 14.9 – m 379
2003-10-26 11:48:35 C 00 39 36.07 +43 07 16.6 – m 379
2003-10-26 11:50:38 C 00 39 35.37 +43 07 17.7 – m 379
2003-10-26 19:10:47 C 00 37 07.88 +43 12 09.4 – c A32
2003-10-26 19:21:24 C 00 37 04.24 +43 12 16.9 – c A32
2003-10-26 19:32:00 C 00 37 00.55 +43 12 24.2 – c A32
2003-10-26 19:42:36 C 00 36 56.92 +43 12 31.5 – c A32
2003-10-26 19:53:12 C 00 36 53.30 +43 12 38.9 – c A32
2003-10-26 23:47:28 C 00 35 32.50 +43 15 13.7 – r 967
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)