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
2003-10-30 20:02:10 C 00 00 09.46 +43 56 54.1 – – A30
2003-10-30 20:04:01 C 00 00 08.71 +43 56 54.0 – – A30
2003-10-30 20:06:02 C 00 00 07.83 +43 56 54.4 – – A30
2003-10-30 20:10:52 C 00 00 05.73 +43 56 55.3 – – A30
2003-10-31 02:42:52 C 23 57 17.99 +43 58 10.8 – c H41
2003-10-31 02:48:28 C 23 57 15.56 +43 58 11.6 – c H41
2003-10-31 10:36:00 C 23 53 52.68 +43 59 11.1 – c 372
2003-11-01 10:26:34 C 23 43 10.07 +43 59 37.6 – c 900
2003-11-01 10:38:35 C 23 43 04.47 +43 59 36.4 – c 900
2003-11-01 12:21:38 C 23 42 15.94 +43 59 29.0 – – 355
2003-11-01 12:24:13 C 23 42 14.75 +43 59 29.0 – – 355
2003-11-01 13:30:30 C 23 41 43.63 +43 59 17.3 – – 392
2003-11-01 13:40:15 C 23 41 39.03 +43 59 16.3 – – 392
2003-11-01 18:31:52 C 23 39 24.67 +43 58 35.5 – o 084
2003-11-01 18:35:38 C 23 39 22.90 +43 58 35.1 – o 084
2003-11-01 19:29:17 C 23 38 58.32 +43 58 34.9 – r 232
2003-11-01 19:32:44 C 23 38 56.70 +43 58 34.7 – r 232
2003-11-01 19:37:47 C 23 38 54.30 +43 58 34.1 – r 232
2003-11-01 21:12:29 C 23 38 09.19 +43 58 19.9 – r 213
2003-11-01 21:14:02 C 23 38 08.47 +43 58 19.4 – r 213
2003-11-01 21:15:29 C 23 38 07.77 +43 58 19.4 – r 213
2003-11-01 23:15:01 C 23 37 10.95 +43 57 56.4 – c 945
2003-11-01 23:27:25 C 23 37 05.03 +43 57 53.6 – c 442
2003-11-01 23:28:47 C 23 37 04.39 +43 57 53.8 – c 945
2003-11-01 23:33:10 C 23 37 02.36 +43 57 52.9 – c 945
2003-11-01 23:37:44 C 23 37 00.08 +43 57 51.6 – c 945
2003-11-01 23:52:22 C 23 36 53.15 +43 57 48.1 – c 442
2003-11-02 02:46:22 C 23 35 32.24 +43 57 20.9 – c H41
2003-11-02 02:51:08 C 23 35 29.96 +43 57 20.0 – c H41
2003-11-02 02:58:37 C 23 35 26.33 +43 57 18.4 – c H41
2003-11-02 03:01:59 C 23 35 24.73 +43 57 17.6 – c H41
2003-11-02 03:21:38 C 23 35 15.24 +43 57 13.5 – c H41
2003-11-02 03:30:48 C 23 35 10.80 +43 57 11.5 – c H41
2003-11-02 18:33:07 C 23 27 58.52 +43 52 52.9 – r 170
2003-11-02 18:34:33 C 23 27 57.82 +43 52 52.4 – r 170
2003-11-02 18:37:29 C 23 27 56.37 +43 52 51.5 – r 170
2003-11-02 18:38:13 C 23 27 56.01 +43 52 51.2 – r 170
2003-11-02 18:38:57 C 23 27 55.64 +43 52 51.1 – r 170
2003-11-02 18:51:53 C 23 27 49.24 +43 52 46.8 – r 170
2003-11-02 18:54:01 C 23 27 48.20 +43 52 46.1 – r 170
2003-11-02 18:56:11 C 23 27 47.14 +43 52 45.5 – r 170
2003-11-02 19:28:33 C 23 27 30.78 +43 52 32.6 – o A30
2003-11-02 19:29:55 C 23 27 30.14 +43 52 32.7 – o A30
2003-11-02 19:32:14 C 23 27 29.01 +43 52 31.4 – o A30
2003-11-02 19:34:33 C 23 27 27.88 +43 52 30.1 – o A30
2003-11-02 19:37:24 C 23 27 26.45 +43 52 29.7 – o A30
2003-11-02 21:23:36 C 23 26 33.71 +43 51 47.3 – d A46
2003-11-02 21:24:42 C 23 26 33.17 +43 51 47.4 – d A46
2003-11-02 21:25:50 C 23 26 32.55 +43 51 46.9 – d A46
2003-11-02 21:26:58 C 23 26 32.00 +43 51 46.2 – 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)