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
2003-11-02 21:28:04 C 23 26 31.44 +43 51 45.7 – d A46
2003-11-02 21:33:17 C 23 26 28.82 +43 51 43.9 – d A46
2003-11-02 22:58:40 C 23 25 46.81 +43 51 15.0 – c 458
2003-11-02 23:09:27 C 23 25 41.54 +43 51 10.4 – c 458
2003-11-02 23:17:32 C 23 25 37.48 +43 51 06.9 – c 458
2003-11-03 06:03:33 C 23 22 16.90 +43 48 13.5 – c H41
2003-11-03 06:07:56 C 23 22 14.70 +43 48 11.3 – c H41
2003-11-03 06:13:20 C 23 22 12.01 +43 48 08.6 – c H41
2003-11-03 06:15:02 C 23 22 11.14 +43 48 07.7 – c H41
2003-11-03 06:25:28 C 23 22 05.92 +43 48 02.5 – c H41
2003-11-03 06:28:12 C 23 22 04.53 +43 48 00.9 – c H41
2003-11-03 06:30:38 C 23 22 03.33 +43 47 59.7 – c H41
2003-11-03 06:32:24 C 23 22 02.43 +43 47 58.7 – c H41
2003-11-03 17:36:16 C 23 16 32.76 +43 42 15.0 – o 461
2003-11-03 17:36:57 C 23 16 32.43 +43 42 14.6 – o 461
2003-11-03 17:37:38 C 23 16 32.08 +43 42 14.2 – o 461
2003-11-03 17:38:18 C 23 16 31.74 +43 42 13.9 – o 461
2003-11-03 17:39:00 C 23 16 31.40 +43 42 13.5 – o 461
2003-11-03 17:39:39 C 23 16 31.04 +43 42 13.1 – o 461
2003-11-03 17:40:18 C 23 16 30.70 +43 42 12.7 – o 461
2003-11-03 17:41:00 C 23 16 30.36 +43 42 12.4 – o 461
2003-11-03 17:41:40 C 23 16 30.02 +43 42 12.0 – o 461
2003-11-03 17:42:20 C 23 16 29.68 +43 42 11.7 – o 461
2003-11-03 18:29:42 C 23 16 05.98 +43 41 46.8 – r 170
2003-11-03 18:41:58 C 23 15 59.73 +43 41 40.1 – r 170
2003-11-03 18:46:48 C 23 15 57.27 +43 41 37.3 – r 170
2003-11-03 21:18:49 C 23 14 39.08 +43 40 06.6 – r 213
2003-11-03 21:40:23 C 23 14 27.94 +43 39 52.9 – r 213
2003-11-04 06:08:00 C 23 10 08.16 +43 34 19.0 – c 704
2003-11-04 06:26:01 C 23 09 58.84 +43 34 06.0 – c 704
2003-11-04 06:37:21 C 23 09 52.67 +43 33 53.9 – c H41
2003-11-04 06:39:55 C 23 09 51.34 +43 33 51.8 – c H41
2003-11-04 06:43:45 C 23 09 49.35 +43 33 48.9 – c H41
2003-11-04 06:43:47 C 23 09 49.62 +43 33 52.4 – c 704
2003-11-04 06:49:12 C 23 09 46.53 +43 33 44.6 – c H41
2003-11-04 06:51:35 C 23 09 45.29 +43 33 42.6 – c H41
2003-11-04 06:59:38 C 23 09 41.14 +43 33 36.3 – c H41
2003-11-04 07:01:38 C 23 09 40.23 +43 33 39.3 – c 704
2003-11-04 07:05:43 C 23 09 38.01 +43 33 31.5 – c H41
2003-11-04 07:09:37 C 23 09 35.98 +43 33 28.6 – c H41
2003-11-04 12:43:37 C 23 06 44.82 +43 29 29.3 – m 340
2003-11-04 12:50:36 C 23 06 41.11 +43 29 24.1 – m 340
2003-11-04 12:57:14 C 23 06 37.70 +43 29 18.3 – m 340
2003-11-04 18:36:00 C 23 03 42.78 +43 24 39.6 – d A46
2003-11-04 18:37:07 C 23 03 42.19 +43 24 39.0 – d A46
2003-11-04 18:40:29 C 23 03 40.43 +43 24 35.5 – d A46
2003-11-04 18:52:50 C 23 03 33.87 +43 24 25.3 – d A46
2003-11-04 18:56:12 C 23 03 32.04 +43 24 22.7 – d A46
2003-11-04 18:57:17 C 23 03 31.47 +43 24 21.6 – d A46
2003-11-04 20:47:15 C 23 02 33.29 +43 22 46.5 – d 048
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)