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
2003-10-04 16:32:45 C 02 11 37.47 +35 13 53.7 – m 379
2003-10-04 16:33:56 C 02 11 37.39 +35 13 55.6 – m 349
2003-10-04 16:35:47 C 02 11 37.21 +35 13 56.2 – m 379
2003-10-04 16:37:09 C 02 11 37.15 +35 13 58.2 – m 349
2003-10-04 16:38:48 C 02 11 37.10 +35 13 59.3 – m 379
2003-10-04 21:51:39 C 02 11 14.12 +35 18 18.3 – r 213
2003-10-04 21:54:06 C 02 11 13.94 +35 18 20.3 – d 232
2003-10-04 22:05:13 C 02 11 13.10 +35 18 30.1 – d 232
2003-10-04 22:09:46 C 02 11 12.69 +35 18 33.5 – r 213
2003-10-04 22:11:22 C 02 11 12.58 +35 18 34.8 – r 213
2003-10-04 22:16:21 C 02 11 12.18 +35 18 39.4 – d 232
2003-10-04 23:24:59 C 02 11 06.73 +35 19 35.7 – r 967
2003-10-04 23:58:00 C 02 11 04.16 +35 20 03.3 – r 967
2003-10-05 00:26:55 C 02 11 01.89 +35 20 27.4 – r 967
2003-10-06 03:58:20 C 02 08 50.21 +35 43 47.1 – c 750
2003-10-06 04:05:39 C 02 08 49.60 +35 43 53.5 – c 750
2003-10-06 04:14:06 C 02 08 48.88 +35 44 00.7 – c 750
2003-10-07 04:13:58 C 02 06 43.33 +36 04 39.4 – c 204
2003-10-07 13:36:59 C 02 05 52.80 +36 12 56.7 – – 392
2003-10-07 13:49:29 C 02 05 51.61 +36 13 08.6 – – 392
2003-10-08 12:14:02 C 02 03 43.56 +36 32 54.1 – m 340
2003-10-08 12:17:42 C 02 03 43.13 +36 32 58.0 – m 340
2003-10-08 12:21:03 C 02 03 42.81 +36 33 01.3 – m 340
2003-10-08 16:21:20 C 02 03 18.09 +36 36 37.6 – m 349
2003-10-08 16:24:34 C 02 03 17.73 +36 36 40.6 – m 349
2003-10-08 16:27:46 C 02 03 17.41 +36 36 43.2 – m 349
2003-10-08 16:34:10 C 02 03 16.75 +36 36 49.0 – m 349
2003-10-08 22:11:19 C 02 02 43.55 +36 41 47.3 – c 945
2003-10-08 22:21:33 C 02 02 42.43 +36 41 57.3 – – 939
2003-10-08 22:29:29 C 02 02 41.61 +36 42 04.7 – – 939
2003-10-08 22:37:29 C 02 02 40.75 +36 42 12.4 – – 939
2003-10-08 22:39:07 C 02 02 40.77 +36 42 11.8 – r 445
2003-10-08 22:51:49 C 02 02 39.49 +36 42 22.9 – r 445
2003-10-08 22:55:05 C 02 02 39.05 +36 42 26.0 – c 945
2003-10-08 23:07:54 C 02 02 37.60 +36 42 39.1 – c 945
2003-10-08 23:10:51 C 02 02 37.53 +36 42 42.4 – r 445
2003-10-08 23:17:52 C 02 02 36.55 +36 42 47.2 – c 945
2003-10-08 23:24:49 C 02 02 35.98 +36 42 54.1 – r 445
2003-10-09 04:14:48 C 02 02 04.96 +36 47 12.1 – c 204
2003-10-09 04:16:28 C 02 02 04.81 +36 47 13.1 – c 204
2003-10-09 04:19:18 C 02 02 04.46 +36 47 15.5 – c 204
2003-10-09 20:34:38 C 02 00 22.41 +37 01 57.7 – r 213
2003-10-09 20:36:22 C 02 00 22.22 +37 01 59.2 – r 213
2003-10-09 20:38:04 C 02 00 22.04 +37 02 01.1 – r 213
2003-10-11 23:29:59 C 01 54 23.62 +37 48 57.7 – c 235
2003-10-12 22:31:38 C 01 51 23.87 +38 10 35.3 – r 213
2003-10-12 22:40:04 C 01 51 22.72 +38 10 43.6 – r 213
2003-10-12 22:41:19 C 01 51 22.54 +38 10 45.4 – r 213
2003-10-12 23:49:12 C 01 51 12.97 +38 11 46.7 – c A32
2003-10-15 06:34:30 C 01 43 11.52 +39 04 09.0 – c 750
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)