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
2013-09-03 03:18:40 C 04 09 21.02 +34 07 18.9 – w I72
2013-09-03 03:22:48 C 04 09 21.64 +34 07 22.8 – w I72
2013-09-03 03:26:55 C 04 09 22.17 +34 07 26.0 – w I72
2013-09-03 23:35:51 C 04 12 05.51 +34 23 51.0 – w I81
2013-09-03 23:42:03 C 04 12 06.38 +34 23 56.5 – w I81
2013-09-04 01:02:09 C 04 12 17.06 +34 25 01.6 – w J38
2013-09-04 01:04:20 C 04 12 17.37 +34 25 04.1 – w J38
2013-09-04 01:29:43 C 04 12 20.89 +34 25 25.9 – q C23
2013-09-04 01:42:28 C 04 12 22.64 +34 25 37.3 – q 215
2013-09-04 01:44:19 C 04 12 22.89 +34 25 38.8 – q 215
2013-09-04 01:46:10 C 04 12 23.15 +34 25 40.3 – q 215
2013-09-04 01:46:25 C 04 12 23.20 +34 25 40.3 – q C10
2013-09-04 01:54:21 C 04 12 24.28 +34 25 46.6 – q C23
2013-09-04 02:09:10 C 04 12 26.28 +34 25 59.5 – q B83
2013-09-04 02:12:50 C 04 12 26.77 +34 26 02.2 – q C23
2013-09-04 02:15:45 C 04 12 27.47 +34 26 06.0 – q B83
2013-09-04 02:29:40 C 04 12 29.06 +34 26 16.3 – q C10
2013-09-04 02:57:37 C 04 12 32.87 +34 26 39.4 – q C10
2013-09-04 03:02:06 C 04 12 33.46 +34 26 43.7 – w 160
2013-09-04 03:06:02 C 04 12 33.99 +34 26 47.0 – w 160
2013-09-04 03:09:57 C 04 12 34.51 +34 26 50.5 – w 160
2013-09-04 03:18:04 C 04 12 35.60 +34 26 57.7 – c A24
2013-09-04 03:18:26 C 04 12 35.61 +34 26 57.7 – c A24
2013-09-04 03:21:30 C 04 12 36.20 +34 27 00.1 – w I72
2013-09-04 03:25:43 C 04 12 36.76 +34 27 03.5 – w I72
2013-09-04 03:30:03 C 04 12 37.37 +34 27 07.4 – w I72
2013-09-04 23:40:17 C 04 15 25.66 +34 43 50.0 – u C36
2013-09-04 23:42:01 C 04 15 25.96 +34 43 51.7 – u C36
2013-09-04 23:43:47 C 04 15 26.23 +34 43 53.6 – u C36
2013-09-04 23:45:31 C 04 15 26.49 +34 43 54.6 – u C36
2013-09-04 23:47:17 C 04 15 26.67 +34 43 55.5 – u C36
2013-09-04 23:49:03 C 04 15 26.93 +34 43 56.9 – u C36
2013-09-04 23:53:33 C 04 15 27.65 +34 44 01.9 – u C36
2013-09-05 00:24:29 C 04 15 31.94 +34 44 24.7 – q C23
2013-09-05 00:28:49 C 04 15 32.54 +34 44 29.5 – q A71
2013-09-05 00:42:57 C 04 15 34.51 +34 44 41.1 – q C23
2013-09-05 00:44:22 C 04 15 34.71 +34 44 43.2 – q A71
2013-09-05 00:59:55 C 04 15 36.91 +34 44 56.4 – q A71
2013-09-05 01:00:26 C 04 15 37.30 +34 44 59.9 – v K15
2013-09-05 01:12:00 C 04 15 38.61 +34 45 05.8 – q C23
2013-09-05 01:20:41 C 04 15 40.21 +34 45 16.6 – v K15
2013-09-05 01:25:45 C 04 15 40.68 +34 45 19.1 – v K15
2013-09-05 01:30:49 C 04 15 41.30 +34 45 22.7 – v K15
2013-09-05 02:09:42 C 04 15 46.76 +34 45 55.5 – w 213
2013-09-05 02:15:09 C 04 15 47.52 +34 46 00.1 – w 213
2013-09-05 02:20:36 C 04 15 48.29 +34 46 04.8 – w 213
2013-09-05 02:46:31 C 04 15 52.13 +34 46 27.9 – q G40
2013-09-05 02:51:19 C 04 15 52.80 +34 46 31.5 – q G40
2013-09-05 03:11:07 C 04 15 55.35 +34 46 47.2 – w I72
2013-09-05 03:15:14 C 04 15 55.99 +34 46 50.9 – w I72
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)