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
2003-11-04 20:49:01 C 23 02 32.36 +43 22 45.0 – d 048
2003-11-04 20:50:13 C 23 02 31.70 +43 22 44.1 – d 048
2003-11-04 20:52:34 C 23 02 30.47 +43 22 41.6 – d 048
2003-11-04 20:54:57 C 23 02 29.23 +43 22 39.7 – d 048
2003-11-05 02:02:24 C 22 59 46.62 +43 17 51.5 – c 235
2003-11-05 07:09:32 C 22 57 04.52 +43 13 09.6 – c H41
2003-11-05 07:11:51 C 22 57 03.29 +43 13 07.4 – c H41
2003-11-05 07:13:04 C 22 57 02.56 +43 13 05.8 – c H41
2003-11-05 07:15:41 C 22 57 01.20 +43 13 03.3 – c H41
2003-11-05 07:16:45 C 22 57 00.68 +43 13 01.0 – c H41
2003-11-05 07:23:44 C 22 56 56.92 +43 12 54.5 – c H41
2003-11-05 19:25:26 C 22 50 34.27 +43 00 18.9 – d 048
2003-11-05 19:26:02 C 22 50 33.95 +43 00 18.3 – d 048
2003-11-05 19:26:36 C 22 50 33.65 +43 00 17.9 – d 048
2003-11-05 19:27:13 C 22 50 33.31 +43 00 17.2 – d 048
2003-11-05 19:30:46 C 22 50 31.39 +43 00 13.1 – d 048
2003-11-05 21:57:09 C 22 49 12.03 +42 57 21.4 – c A32
2003-11-05 22:00:23 C 22 49 10.30 +42 57 17.7 – c A32
2003-11-05 22:03:38 C 22 49 08.53 +42 57 13.7 – c A32
2003-11-05 22:06:53 C 22 49 06.72 +42 57 09.9 – c A32
2003-11-05 22:10:07 C 22 49 05.00 +42 57 05.9 – c A32
2003-11-06 11:30:04 C 22 41 52.79 +42 40 48.0 – – 355
2003-11-06 11:34:26 C 22 41 50.39 +42 40 41.5 – – 355
2003-11-06 11:36:34 C 22 41 49.25 +42 40 38.4 – – 355
2003-11-06 21:46:11 C 22 36 15.98 +42 26 30.6 – c 458
2003-11-06 21:48:55 C 22 36 13.78 +42 26 33.9 – c 458
2003-11-06 21:52:58 C 22 36 12.06 +42 26 19.4 – r 213
2003-11-06 21:54:42 C 22 36 11.10 +42 26 16.6 – r 213
2003-11-06 21:56:19 C 22 36 10.43 +42 26 16.3 – c 458
2003-11-06 21:56:35 C 22 36 10.04 +42 26 13.9 – r 213
2003-11-06 22:20:00 C 22 35 57.14 +42 25 32.1 – c A32
2003-11-06 22:23:14 C 22 35 55.44 +42 25 27.6 – c A32
2003-11-06 22:26:30 C 22 35 53.62 +42 25 22.5 – c A32
2003-11-06 22:29:45 C 22 35 51.82 +42 25 17.7 – c A32
2003-11-06 22:32:59 C 22 35 50.03 +42 25 12.7 – c A32
2003-11-07 20:10:43 C 22 23 54.18 +41 50 52.3 – r 620
2003-11-07 20:18:17 C 22 23 49.81 +41 50 38.6 – r 620
2003-11-07 20:19:25 C 22 23 49.12 +41 50 36.7 – r 620
2003-11-07 20:20:29 C 22 23 48.60 +41 50 35.1 – r 620
2003-11-07 20:26:06 C 22 23 45.37 +41 50 25.1 – r 620
2003-11-08 07:29:58 C 22 17 34.09 +41 30 07.5 – c H41
2003-11-08 07:31:43 C 22 17 33.19 +41 30 03.1 – c H41
2003-11-08 07:33:02 C 22 17 32.56 +41 30 01.7 – c H41
2003-11-08 07:35:03 C 22 17 31.39 +41 29 56.3 – c H41
2003-11-08 07:36:13 C 22 17 30.70 +41 29 57.4 – c H41
2003-11-08 07:38:51 C 22 17 29.33 +41 29 49.1 – c H41
2003-11-08 07:39:49 C 22 17 28.68 +41 29 48.0 – c H41
2003-11-08 07:42:22 C 22 17 27.30 +41 29 42.9 – c H41
2003-11-08 16:58:33 C 22 12 19.07 +41 11 47.9 – d 048
2003-11-08 17:03:30 C 22 12 15.89 +41 11 33.5 – o 084
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)