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
2003-10-23 03:27:14 C 01 03 41.76 +42 03 11.5 – r 750
2003-10-23 03:44:38 C 01 03 37.01 +42 03 27.0 – r 750
2003-10-23 05:58:13 C 01 03 00.15 +42 05 29.4 – c H41
2003-10-23 06:02:13 C 01 02 59.04 +42 05 33.2 – c H41
2003-10-23 15:31:59 C 01 00 22.56 +42 13 44.6 – – 360
2003-10-23 15:35:16 C 01 00 21.48 +42 13 46.0 – m 349
2003-10-23 15:36:13 C 01 00 21.35 +42 13 48.3 – – 360
2003-10-23 15:39:36 C 01 00 20.27 +42 13 49.6 – m 349
2003-10-23 15:42:06 C 01 00 19.63 +42 13 52.6 – m 379
2003-10-23 15:42:45 C 01 00 19.39 +42 13 52.2 – m 349
2003-10-23 15:45:07 C 01 00 18.81 +42 13 54.7 – m 379
2003-10-23 15:45:42 C 01 00 18.56 +42 13 54.7 – m 349
2003-10-23 15:48:10 C 01 00 17.87 +42 13 57.9 – m 379
2003-10-23 19:02:08 C 00 59 25.63 +42 16 38.1 – r 213
2003-10-23 19:08:17 C 00 59 23.65 +42 16 41.9 – c 127
2003-10-23 19:13:18 C 00 59 22.21 +42 16 45.5 – c A18
2003-10-23 19:13:20 C 00 59 22.25 +42 16 46.4 – c 127
2003-10-23 19:18:21 C 00 59 20.81 +42 16 50.6 – c 127
2003-10-23 19:23:51 C 00 59 19.24 +42 16 55.5 – c 127
2003-10-23 19:24:24 C 00 59 19.29 +42 16 57.9 – r 213
2003-10-23 19:25:08 C 00 59 19.11 +42 16 58.6 – r 213
2003-10-23 19:28:54 C 00 59 17.82 +42 17 00.1 – c 127
2003-10-23 19:34:21 C 00 59 16.22 +42 17 04.3 – c A18
2003-10-23 19:58:33 C 00 59 09.33 +42 17 25.6 – c A18
2003-10-23 20:29:36 C 00 59 00.37 +42 17 51.9 – c A32
2003-10-23 20:33:50 C 00 58 59.19 +42 17 55.4 – c A32
2003-10-23 20:35:57 C 00 58 58.59 +42 17 57.3 – c A32
2003-10-23 20:50:46 C 00 58 54.27 +42 18 10.1 – c A32
2003-10-23 21:35:33 C 00 58 41.16 +42 18 45.6 – c 174
2003-10-23 21:39:56 C 00 58 39.98 +42 18 49.2 – c 174
2003-10-23 21:45:27 C 00 58 38.42 +42 18 53.9 – c 174
2003-10-23 21:50:55 C 00 58 36.83 +42 18 58.5 – c 174
2003-10-23 21:56:26 C 00 58 35.24 +42 19 03.3 – c 174
2003-10-24 06:33:09 C 00 56 07.07 +42 26 26.7 – c H41
2003-10-24 06:37:54 C 00 56 05.62 +42 26 30.7 – c H41
2003-10-24 06:42:51 C 00 56 04.16 +42 26 34.2 – c H41
2003-10-24 12:09:24 C 00 54 30.18 +42 31 02.6 – m 379
2003-10-24 12:12:25 C 00 54 29.36 +42 31 05.3 – m 379
2003-10-24 12:15:27 C 00 54 28.36 +42 31 08.0 – m 379
2003-10-24 17:19:53 C 00 52 58.95 +42 35 03.4 – c A32
2003-10-24 17:26:23 C 00 52 57.01 +42 35 09.0 – c A32
2003-10-24 17:32:51 C 00 52 55.08 +42 35 14.3 – c A32
2003-10-24 17:39:20 C 00 52 53.14 +42 35 19.8 – c A32
2003-10-24 17:45:48 C 00 52 51.19 +42 35 25.3 – c A32
2003-10-24 18:15:06 C 00 52 42.43 +42 35 51.7 – d A46
2003-10-24 18:16:50 C 00 52 41.91 +42 35 53.3 – d A46
2003-10-24 18:18:29 C 00 52 41.43 +42 35 54.5 – d A46
2003-10-24 18:20:06 C 00 52 40.94 +42 35 55.9 – d A46
2003-10-24 18:24:59 C 00 52 39.48 +42 35 59.9 – d A46
2003-10-24 18:26:35 C 00 52 38.98 +42 36 01.1 – d A46
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)