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
2003-10-17 21:05:10 C 01 32 22.10 +40 04 39.9 – c A41
2003-10-17 21:20:43 C 01 32 19.10 +40 04 55.1 – c A41
2003-10-17 21:36:00 C 01 32 16.11 +40 05 10.3 – c A41
2003-10-18 02:13:32 C 01 31 22.21 +40 09 35.4 – c A18
2003-10-18 02:19:39 C 01 31 21.01 +40 09 41.6 – c A18
2003-10-18 03:36:40 C 01 31 07.60 +40 11 02.1 – c H41
2003-10-18 03:42:40 C 01 31 06.45 +40 11 08.3 – c H41
2003-10-18 15:50:15 C 01 28 42.78 +40 22 52.4 – c D70
2003-10-18 16:00:44 C 01 28 40.62 +40 23 02.3 – c D70
2003-10-18 16:02:19 C 01 28 40.28 +40 23 04.0 – c D70
2003-10-18 16:08:55 C 01 28 38.92 +40 23 10.3 – c D70
2003-10-18 20:10:01 C 01 27 51.90 +40 26 58.0 – r 620
2003-10-18 20:15:38 C 01 27 50.75 +40 27 03.5 – r 620
2003-10-18 20:20:59 C 01 27 49.64 +40 27 08.8 – r 620
2003-10-18 23:43:01 C 01 27 07.89 +40 30 27.1 – r 445
2003-10-18 23:51:35 C 01 27 06.06 +40 30 35.3 – r 445
2003-10-19 05:09:43 C 01 26 00.81 +40 35 44.0 – c H41
2003-10-19 05:18:28 C 01 25 59.04 +40 35 52.1 – c H41
2003-10-19 05:26:33 C 01 25 57.30 +40 36 00.1 – c H41
2003-10-19 11:20:51 C 01 24 44.05 +40 41 36.0 – m 349
2003-10-19 11:23:04 C 01 24 43.55 +40 41 38.9 – m 349
2003-10-19 11:25:17 C 01 24 43.03 +40 41 40.6 – m 349
2003-10-19 11:27:30 C 01 24 42.63 +40 41 42.7 – m 349
2003-10-19 12:23:30 C 01 24 30.66 +40 42 37.2 – m 367
2003-10-19 12:27:58 C 01 24 29.73 +40 42 41.9 – m 367
2003-10-19 12:32:29 C 01 24 28.70 +40 42 46.3 – m 367
2003-10-19 13:31:47 C 01 24 15.88 +40 43 44.4 – – 360
2003-10-19 13:35:16 C 01 24 15.13 +40 43 47.8 – – 360
2003-10-19 20:34:06 C 01 22 45.89 +40 50 23.5 – r 213
2003-10-19 20:34:51 C 01 22 45.69 +40 50 24.1 – r 213
2003-10-19 20:44:09 C 01 22 43.68 +40 50 33.5 – r 213
2003-10-20 04:06:46 C 01 21 06.71 +40 57 39.8 – c H41
2003-10-20 04:11:15 C 01 21 05.69 +40 57 43.9 – c H41
2003-10-20 06:40:24 C 01 20 31.82 +41 00 01.6 – r 750
2003-10-20 06:44:53 C 01 20 30.79 +41 00 05.6 – r 750
2003-10-20 07:08:35 C 01 20 25.40 +41 00 27.9 – r 750
2003-10-21 00:19:17 C 01 16 30.55 +41 16 37.6 – r 967
2003-10-21 00:38:49 C 01 16 25.90 +41 16 55.9 – r 967
2003-10-21 06:35:40 C 01 15 01.74 +41 22 35.6 – c H41
2003-10-21 06:43:11 C 01 14 59.86 +41 22 43.0 – c H41
2003-10-21 06:52:31 C 01 14 57.61 +41 22 51.2 – c H41
2003-10-22 05:22:31 C 01 09 26.77 +41 43 34.0 – c H41
2003-10-22 05:27:25 C 01 09 25.48 +41 43 38.1 – c H41
2003-10-22 05:32:52 C 01 09 24.12 +41 43 43.2 – c H41
2003-10-22 19:11:01 C 01 05 53.70 +41 55 47.4 – m 206
2003-10-22 19:15:02 C 01 05 52.72 +41 55 50.4 – m 206
2003-10-22 19:19:31 C 01 05 51.44 +41 55 54.7 – m 206
2003-10-22 19:55:59 C 01 05 41.87 +41 56 33.3 – c 235
2003-10-23 03:17:21 C 01 03 44.45 +42 03 02.8 – r 750
2003-10-23 03:23:03 C 01 03 42.89 +42 03 07.9 – r 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)