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
2002-09-14 04:45:59 C 23 01 49.07 -02 28 59.0 – c 695
2002-09-14 06:05:51 C 23 01 45.71 -02 29 17.4 – c 695
2002-09-14 06:41:42 C 23 01 44.23 -02 29 25.0 – c 695
2002-09-14 07:03:08 C 23 01 43.33 -02 29 30.4 – – 644
2002-09-14 07:33:50 C 23 01 42.03 -02 29 37.3 – – 644
2002-09-14 08:03:28 C 23 01 40.75 -02 29 44.5 – c 695
2002-09-14 08:04:17 C 23 01 40.75 -02 29 44.2 – – 644
2002-09-14 09:38:51 C 23 01 36.79 -02 30 06.0 – c 695
2002-09-14 11:16:23 C 23 01 32.73 -02 30 28.3 – c 695
2002-09-14 22:05:48 C 23 01 05.98 -02 32 56.3 – c 204
2002-09-14 22:21:58 C 23 01 05.35 -02 33 00.4 – c 204
2002-09-14 22:27:10 C 23 01 05.04 -02 33 02.1 – c 204
2002-09-14 22:41:41 C 23 01 04.52 -02 33 05.1 – c 204
2002-09-15 02:52:31 C 23 00 54.24 -02 34 01.5 – c 695
2002-09-15 03:53:46 C 23 00 51.71 -02 34 15.3 – c 695
2002-09-15 05:02:04 C 23 00 48.80 -02 34 31.2 – c 695
2002-09-15 06:04:50 C 23 00 46.19 -02 34 45.4 – c 695
2002-09-15 07:44:16 C 23 00 42.01 -02 35 08.3 – c 695
2002-09-15 08:53:07 C 23 00 39.12 -02 35 24.1 – c 695
2002-09-15 10:34:01 C 23 00 34.88 -02 35 47.1 – c 695
2002-09-15 11:10:07 C 23 00 33.37 -02 35 55.2 – c 695
2002-09-16 02:49:11 C 22 59 54.98 -02 39 29.3 – c 695
2002-09-16 04:12:51 C 22 59 51.48 -02 39 48.2 – c 695
2002-09-16 05:19:34 C 22 59 48.68 -02 40 03.5 – c 695
2002-09-16 06:01:02 C 22 59 46.94 -02 40 12.8 – c 695
2002-09-16 06:44:51 C 22 59 45.14 -02 40 22.9 – c 695
2002-09-16 08:06:01 C 22 59 41.72 -02 40 41.6 – c 695
2002-09-16 09:01:28 C 22 59 39.45 -02 40 54.0 – c 695
2002-09-16 10:24:52 C 22 59 35.93 -02 41 13.2 – c 695
2002-10-02 13:46:13 C 22 44 34.97 -04 06 06.7 – c 360
2002-10-02 13:53:49 C 22 44 34.65 -04 06 08.1 – c 360
2002-10-03 03:15:25 C 22 44 06.51 -04 08 51.3 – c 695
2002-10-03 03:24:58 C 22 44 06.21 -04 08 53.1 – c 695
2002-10-03 05:43:20 C 22 44 01.28 -04 09 21.0 – c 695
2002-10-03 05:54:42 C 22 44 00.86 -04 09 23.4 – c 695
2002-10-03 06:25:50 C 22 43 59.83 -04 09 29.0 – c 695
2002-10-03 07:13:18 C 22 43 58.11 -04 09 38.9 – c 695
2002-10-03 07:34:07 C 22 43 57.34 -04 09 43.1 – c 695
2002-10-03 07:54:13 C 22 43 56.59 -04 09 47.4 – c 695
2002-10-03 08:13:05 C 22 43 55.98 -04 09 50.8 – c 695
2002-10-04 02:22:24 C 22 43 18.34 -04 13 29.8 – c 695
2002-10-04 03:15:47 C 22 43 16.52 -04 13 40.2 – c 695
2002-10-04 04:13:28 C 22 43 14.43 -04 13 52.0 – c 695
2002-10-04 05:08:26 C 22 43 12.53 -04 14 02.8 – c 695
2002-10-04 05:38:41 C 22 43 11.47 -04 14 09.1 – c 695
2002-10-04 06:41:09 C 22 43 09.31 -04 14 21.0 – c 695
2002-10-04 07:58:54 C 22 43 06.54 -04 14 36.7 – c 695
2002-10-04 09:20:07 C 22 43 03.75 -04 14 52.7 – c 695
2002-10-04 20:54:22 C 22 42 40.20 -04 17 10.8 – c 246
2002-10-04 20:57:02 C 22 42 40.11 -04 17 11.6 – c 246
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)