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
2003-09-27 06:05:44 C 02 21 44.25 +32 54 25.8 – r 642
2003-09-27 06:10:11 C 02 21 44.08 +32 54 29.2 – r 642
2003-09-27 18:34:15 – 02 21 12.27 +33 03 40.6 – – 372
2003-09-28 04:44:03 C 02 20 46.48 +33 11 09.5 – c H44
2003-09-28 05:33:11 C 02 20 44.29 +33 11 42.4 – r 642
2003-09-28 05:37:20 C 02 20 44.15 +33 11 45.6 – r 642
2003-09-28 05:41:29 C 02 20 43.93 +33 11 48.5 – r 642
2003-09-28 05:49:41 C 02 20 43.41 +33 11 59.5 – c H41
2003-09-28 05:54:33 C 02 20 43.23 +33 12 03.6 – c H41
2003-09-28 06:14:21 C 02 20 42.25 +33 12 17.8 – c H44
2003-09-28 16:20:26 C 02 20 14.49 +33 19 50.6 – c 900
2003-09-28 16:39:57 C 02 20 13.54 +33 20 05.4 – c 900
2003-09-29 05:21:29 C 02 19 37.96 +33 29 32.6 – r 642
2003-09-29 05:25:39 C 02 19 37.71 +33 29 36.4 – r 642
2003-09-29 05:29:49 C 02 19 37.57 +33 29 39.9 – r 642
2003-09-29 16:54:59 C 02 19 02.97 +33 38 25.3 – m 349
2003-09-29 16:58:11 C 02 19 02.84 +33 38 27.2 – m 349
2003-09-29 17:01:25 C 02 19 02.65 +33 38 29.7 – m 349
2003-09-30 13:23:20 C 02 17 59.36 +33 54 07.7 – m 340
2003-09-30 13:27:14 C 02 17 59.18 +33 54 11.6 – m 340
2003-09-30 13:30:26 C 02 17 58.98 +33 54 14.3 – m 340
2003-09-30 16:47:49 C 02 17 47.69 +33 56 49.2 – – 360
2003-09-30 16:51:17 C 02 17 47.49 +33 56 51.9 – – 360
2003-09-30 21:18:21 C 02 17 33.24 +34 00 14.5 – c 235
2003-09-30 22:05:57 C 02 17 30.47 +34 00 53.8 – d A46
2003-09-30 22:07:34 C 02 17 30.36 +34 00 54.3 – d A46
2003-09-30 22:09:12 C 02 17 30.24 +34 00 55.8 – d A46
2003-09-30 22:10:49 C 02 17 30.17 +34 00 57.3 – d A46
2003-09-30 22:12:27 C 02 17 30.07 +34 00 58.3 – d A46
2003-09-30 22:14:05 C 02 17 29.93 +34 00 59.8 – d A46
2003-10-01 21:25:20 C 02 16 09.43 +34 19 13.2 – r 213
2003-10-01 21:28:49 C 02 16 09.19 +34 19 14.8 – r 213
2003-10-01 21:30:47 C 02 16 09.08 +34 19 17.6 – r 213
2003-10-02 06:10:31 C 02 15 36.95 +34 26 13.5 – c 750
2003-10-02 06:15:28 C 02 15 36.61 +34 26 17.4 – c 750
2003-10-02 06:20:57 C 02 15 36.27 +34 26 21.3 – c 750
2003-10-02 07:10:06 C 02 15 33.27 +34 27 02.8 – c 704
2003-10-02 07:44:54 C 02 15 30.81 +34 27 32.1 – c H41
2003-10-02 07:51:41 C 02 15 30.31 +34 27 36.9 – c H41
2003-10-02 08:09:04 C 02 15 29.38 +34 27 50.0 – c 704
2003-10-02 08:27:24 C 02 15 28.19 +34 28 05.1 – c 704
2003-10-04 09:30:57 C 02 12 08.60 +35 08 04.4 – m 683
2003-10-04 09:39:44 C 02 12 07.93 +35 08 11.7 – m 683
2003-10-04 09:47:11 C 02 12 07.37 +35 08 17.8 – m 683
2003-10-04 09:54:22 C 02 12 06.82 +35 08 24.0 – c 691
2003-10-04 10:35:21 C 02 12 03.67 +35 08 57.6 – c 691
2003-10-04 11:15:00 C 02 12 00.63 +35 09 30.0 – c 691
2003-10-04 15:03:53 C 02 11 44.48 +35 12 41.0 – m 379
2003-10-04 16:27:32 C 02 11 37.89 +35 13 50.3 – m 349
2003-10-04 16:30:44 C 02 11 37.63 +35 13 53.2 – m 349
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)