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
2003-09-05 23:15:25 C 02 27 57.28 +27 39 18.7 – d A46
2003-09-06 00:46:33 C 02 27 57.86 +27 40 06.1 – c A32
2003-09-06 00:52:54 C 02 27 57.88 +27 40 10.0 – c A32
2003-09-06 00:59:15 C 02 27 57.95 +27 40 12.8 – c A32
2003-09-06 01:04:54 C 02 27 58.06 +27 40 15.5 – r 213
2003-09-06 01:05:37 C 02 27 57.99 +27 40 16.6 – c A32
2003-09-06 01:10:23 C 02 27 58.13 +27 40 18.9 – r 213
2003-09-06 01:11:58 C 02 27 58.03 +27 40 19.7 – c A32
2003-09-06 01:15:48 C 02 27 58.12 +27 40 21.3 – r 213
2003-09-07 05:51:53 C 02 28 10.45 +27 55 39.1 – d 859
2003-09-07 06:03:20 C 02 28 10.77 +27 55 47.4 – d 859
2003-09-07 06:14:58 C 02 28 10.86 +27 55 51.7 – d 859
2003-09-11 23:35:32 C 02 28 30.27 +28 58 18.4 – r 213
2003-09-11 23:47:47 C 02 28 30.24 +28 58 26.5 – r 213
2003-09-11 23:57:13 C 02 28 30.15 +28 58 31.0 – r 213
2003-09-12 23:22:21 C 02 28 27.56 +29 11 58.6 – d J87
2003-09-12 23:30:46 C 02 28 27.53 +29 12 03.5 – d J87
2003-09-12 23:39:14 C 02 28 27.47 +29 12 08.2 – d J87
2003-09-17 20:18:36 C 02 27 33.53 +30 22 09.3 – c 235
2003-09-17 21:39:19 C 02 27 32.40 +30 22 59.5 – d A46
2003-09-17 21:44:12 C 02 27 32.31 +30 23 02.9 – d A46
2003-09-17 21:49:05 C 02 27 32.18 +30 23 06.4 – d A46
2003-09-17 21:53:57 C 02 27 32.10 +30 23 08.9 – d A46
2003-09-17 21:56:21 C 02 27 32.22 +30 23 09.9 – r 213
2003-09-17 21:58:47 C 02 27 32.12 +30 23 11.9 – d A46
2003-09-17 21:59:53 C 02 27 32.16 +30 23 12.6 – r 213
2003-09-17 22:07:18 C 02 27 32.10 +30 23 17.5 – r 213
2003-09-17 22:08:30 C 02 27 31.99 +30 23 19.8 – d A46
2003-09-18 00:12:34 C 02 27 30.22 +30 24 34.9 – b 967
2003-09-18 00:19:16 C 02 27 30.13 +30 24 40.0 – b 967
2003-09-18 17:44:14 C 02 27 14.99 +30 35 39.7 – m 349
2003-09-18 17:48:28 C 02 27 14.89 +30 35 42.5 – m 349
2003-09-18 17:57:45 C 02 27 14.69 +30 35 49.3 – m 349
2003-09-18 18:02:57 C 02 27 14.65 +30 35 51.6 – m 349
2003-09-18 21:16:18 C 02 27 12.25 +30 37 50.4 – c 215
2003-09-18 21:16:52 C 02 27 12.20 +30 37 50.3 – c 215
2003-09-18 21:17:27 C 02 27 12.21 +30 37 50.8 – c 215
2003-09-18 21:39:56 C 02 27 11.81 +30 38 04.8 – d A46
2003-09-18 21:46:26 C 02 27 11.71 +30 38 09.9 – d A46
2003-09-18 21:48:03 C 02 27 11.65 +30 38 11.1 – d A46
2003-09-18 21:49:39 C 02 27 11.69 +30 38 11.9 – d A46
2003-09-18 21:51:17 C 02 27 11.59 +30 38 12.8 – d A46
2003-09-18 21:52:56 C 02 27 11.60 +30 38 14.1 – d A46
2003-09-18 22:39:48 C 02 27 10.92 +30 38 44.2 – d 048
2003-09-18 22:44:02 C 02 27 10.79 +30 38 47.0 – d 048
2003-09-18 22:48:17 C 02 27 10.66 +30 38 49.2 – d 048
2003-09-18 22:52:32 C 02 27 10.56 +30 38 52.1 – d 048
2003-09-18 22:56:47 C 02 27 10.47 +30 38 55.6 – d 048
2003-09-18 23:42:36 C 02 27 09.82 +30 39 21.3 – c 235
2003-09-19 00:28:20 C 02 27 08.97 +30 39 54.1 – c 204
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)