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
2003-11-19 17:07:33 C 19 55 37.29 +25 39 32.4 – d A46
2003-11-19 17:08:39 C 19 55 36.83 +25 39 27.1 – d A46
2003-11-19 17:09:47 C 19 55 36.34 +25 39 21.6 – d A46
2003-11-19 17:12:02 C 19 55 35.37 +25 39 11.9 – d A46
2003-11-19 17:13:10 C 19 55 34.90 +25 39 07.2 – d A46
2003-11-19 17:16:31 C 19 55 33.49 +25 38 51.5 – d A46
2003-11-19 20:45:04 C 19 54 02.08 +25 22 59.2 – c 204
2003-11-19 20:46:28 C 19 54 01.50 +25 22 53.0 – c 204
2003-11-19 20:47:52 C 19 54 00.91 +25 22 46.9 – c 204
2003-11-20 00:57:10 C 19 52 13.53 +25 04 03.6 – c H41
2003-11-20 01:00:21 C 19 52 12.18 +25 03 48.9 – c H41
2003-11-20 01:04:46 C 19 52 10.17 +25 03 29.0 – c H41
2003-11-20 01:24:18 C 19 52 02.01 +25 01 59.1 – c H41
2003-11-20 01:29:17 C 19 51 59.57 +25 01 36.1 – c H41
2003-11-20 01:34:02 C 19 51 57.59 +25 01 12.6 – c H41
2003-11-21 02:36:04 C 19 41 27.03 +23 06 26.1 – c H41
2003-11-21 02:40:26 C 19 41 25.23 +23 06 05.9 – c H41
2003-11-21 02:48:48 C 19 41 21.82 +23 05 26.5 – c H41
2003-11-21 02:53:34 C 19 41 19.75 +23 05 02.4 – c H41
2003-11-22 01:06:11 C 19 32 24.49 +21 22 52.2 – c H41
2003-11-22 01:09:47 C 19 32 23.08 +21 22 35.5 – c H41
2003-11-22 01:22:08 C 19 32 18.24 +21 21 36.9 – c H41
2003-11-22 01:28:42 C 19 32 15.61 +21 21 07.3 – c H41
2003-11-22 01:32:07 C 19 32 14.25 +21 20 51.6 – c H41
2003-11-22 01:35:11 C 19 32 13.24 +21 20 37.7 – c H41
2003-11-22 01:48:24 C 19 32 07.96 +21 19 37.6 – c H41
2003-11-22 01:53:31 C 19 32 05.70 +21 19 12.3 – c H41
2003-11-23 09:08:58 C 19 20 08.90 +18 55 39.3 – c 900
2003-11-23 09:19:23 C 19 20 04.99 +18 54 51.6 – c 900
2003-11-23 09:43:39 C 19 19 55.99 +18 52 58.8 – m 349
2003-11-23 09:45:06 C 19 19 55.48 +18 52 52.0 – m 349
2003-11-23 09:47:57 C 19 19 54.42 +18 52 38.9 – m 349
2003-11-23 09:49:22 C 19 19 53.85 +18 52 31.9 – m 349
2003-11-23 10:03:21 C 19 19 48.76 +18 51 29.8 – – 360
2003-11-23 10:05:08 C 19 19 48.04 +18 51 21.7 – – 360
2003-11-23 10:07:08 C 19 19 47.30 +18 51 12.3 – – 360
2003-11-23 11:01:41 C 19 19 26.64 +18 47 00.9 – c D70
2003-11-23 11:06:25 C 19 19 24.99 +18 46 39.0 – c D70
2003-11-23 11:08:38 C 19 19 24.28 +18 46 28.6 – c D70
2003-11-23 11:31:50 C 19 19 15.34 +18 44 41.3 – c D70
2003-11-24 15:55:34 C 19 09 02.55 +16 35 37.5 – d 049
2003-11-24 15:59:01 C 19 09 01.30 +16 35 22.4 – d 049
2003-11-24 16:10:28 C 19 08 57.37 +16 34 31.6 – d 049
2003-11-24 18:58:47 C 19 07 57.61 +16 21 52.7 – r J95
2003-11-24 19:01:07 C 19 07 56.83 +16 21 42.1 – r J95
2003-11-24 19:05:15 C 19 07 55.37 +16 21 23.3 – r J95
2003-11-25 01:10:06 C 19 05 47.81 +15 54 13.6 – c H41
2003-11-25 01:18:29 C 19 05 45.01 +15 53 35.1 – c H41
2003-11-25 01:22:28 C 19 05 43.47 +15 53 17.9 – c H41
2003-11-25 01:24:44 C 19 05 42.76 +15 53 07.5 – c H41
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)