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
2003-11-12 19:30:01 C 21 17 27.84 +36 49 26.2 – d 048
2003-11-13 00:33:38 C 21 14 43.41 +36 32 56.2 – d H72
2003-11-13 00:34:42 C 21 14 42.41 +36 32 51.0 – d H72
2003-11-13 00:35:58 C 21 14 41.95 +36 32 48.0 – d H72
2003-11-13 01:24:39 C 21 14 15.00 +36 30 01.7 – d H72
2003-11-13 01:26:08 C 21 14 14.21 +36 29 56.8 – d H72
2003-11-13 01:28:26 C 21 14 12.94 +36 29 49.2 – d H72
2003-11-13 01:29:37 C 21 14 12.33 +36 29 44.5 – d H72
2003-11-13 01:42:19 C 21 14 05.27 +36 29 00.2 – d H72
2003-11-13 01:43:53 C 21 14 04.62 +36 28 56.2 – d H72
2003-11-13 10:09:44 C 21 09 32.16 +36 00 08.6 – m 340
2003-11-13 10:13:11 C 21 09 30.37 +35 59 56.9 – m 340
2003-11-13 10:58:30 C 21 09 05.47 +35 57 17.2 – m 340
2003-11-13 12:21:42 C 21 08 20.39 +35 52 26.1 – c D70
2003-11-13 12:59:48 C 21 07 59.77 +35 50 10.9 – c D70
2003-11-13 13:06:44 C 21 07 55.94 +35 49 43.1 – r 347
2003-11-13 13:10:14 C 21 07 54.10 +35 49 30.0 – r 347
2003-11-13 13:14:05 C 21 07 51.96 +35 49 17.6 – r 347
2003-11-13 13:32:45 C 21 07 41.98 +35 48 13.6 – c D70
2003-11-13 13:37:30 C 21 07 39.39 +35 47 56.9 – c D70
2003-11-13 13:44:30 C 21 07 35.62 +35 47 31.6 – c D70
2003-11-13 13:53:42 C 21 07 30.66 +35 46 59.2 – c D70
2003-11-14 02:07:14 C 21 01 01.01 +35 03 31.3 – c H41
2003-11-14 02:10:34 C 21 00 59.29 +35 03 18.0 – c H41
2003-11-14 02:12:54 C 21 00 57.79 +35 03 10.4 – c H41
2003-11-14 02:15:30 C 21 00 56.50 +35 03 02.4 – c H41
2003-11-14 02:17:40 C 21 00 55.30 +35 02 52.6 – c H41
2003-11-14 02:20:19 C 21 00 53.85 +35 02 43.7 – c H41
2003-11-14 11:49:11 C 20 55 54.00 +34 27 46.4 – c 900
2003-11-14 11:54:59 C 20 55 50.91 +34 27 23.7 – c 900
2003-11-16 09:42:03 C 20 32 32.88 +31 26 48.9 – m 349
2003-11-16 09:43:43 C 20 32 32.06 +31 26 41.7 – m 349
2003-11-16 09:49:14 C 20 32 29.31 +31 26 19.0 – m 349
2003-11-16 09:52:48 C 20 32 27.46 +31 26 04.6 – m 349
2003-11-16 11:17:27 C 20 31 45.32 +31 20 12.5 – – 360
2003-11-16 11:24:19 C 20 31 41.87 +31 19 43.6 – – 360
2003-11-16 11:38:25 C 20 31 34.83 +31 18 44.1 – – 360
2003-11-17 09:44:00 C 20 20 52.87 +29 45 23.7 – – 300
2003-11-17 09:48:40 C 20 20 50.62 +29 45 03.4 – – 300
2003-11-17 09:53:20 C 20 20 48.41 +29 44 43.2 – – 300
2003-11-17 09:57:59 C 20 20 46.12 +29 44 22.4 – – 300
2003-11-17 11:23:00 C 20 20 04.88 +29 38 12.5 – m 340
2003-11-17 11:25:08 C 20 20 03.75 +29 38 02.5 – m 340
2003-11-17 18:01:59 C 20 16 57.43 +29 09 27.9 – c 442
2003-11-17 18:07:07 C 20 16 54.86 +29 09 06.8 – c 442
2003-11-17 18:08:19 C 20 16 54.45 +29 09 00.2 – c 442
2003-11-17 20:17:36 C 20 15 52.51 +28 59 33.1 – r 458
2003-11-17 21:23:49 C 20 15 21.36 +28 54 39.9 – r 213
2003-11-17 21:25:53 C 20 15 20.44 +28 54 28.0 – r 213
2003-11-17 21:30:10 C 20 15 18.38 +28 54 13.7 – r 213
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)