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
2017-01-09 00:59:19 C 23 08 51.12 +04 28 42.2 – q H45
2017-01-09 01:02:25 C 23 08 51.27 +04 28 42.5 – q H45
2017-01-09 01:04:37 C 23 08 51.33 +04 28 42.9 – q H45
2017-01-09 18:03:53 C 23 09 32.69 +04 31 08.4 – q A77
2017-01-09 18:34:13 C 23 09 34.04 +04 31 14.1 – q 160
2017-01-09 18:36:48 C 23 09 34.10 +04 31 14.5 – q 160
2017-01-09 18:39:23 C 23 09 34.16 +04 31 14.7 – q 160
2017-01-09 18:55:51 C 23 09 34.79 +04 31 17.7 – q A77
2017-01-14 17:51:19 C 23 14 45.47 +04 50 48.2 – q 970
2017-01-14 18:20:07 C 23 14 46.84 +04 50 53.0 – q 970
2017-01-14 19:50:24 C 23 14 50.95 +04 51 11.5 – q G40
2017-01-14 20:07:53 C 23 14 51.76 +04 51 14.0 – q G40
2017-01-15 18:45:12 C 23 15 55.09 +04 55 22.7 – w J01
2017-01-15 19:00:57 C 23 15 55.67 +04 55 27.5 – w J01
2017-01-15 19:11:28 C 23 15 56.14 +04 55 28.3 – w J01
2017-01-17 17:45:36 C 23 18 10.24 +05 04 28.6 – q C10
2017-01-17 18:17:52 C 23 18 11.77 +05 04 35.4 – q C10
2017-01-17 18:53:00 C 23 18 13.45 +05 04 41.9 – q C10
2017-01-17 19:34:43 C 23 18 15.50 +05 04 51.7 – q J22
2017-01-17 19:38:14 C 23 18 15.66 +05 04 52.6 – q J22
2017-01-17 19:41:44 C 23 18 15.83 +05 04 53.3 – q J22
2017-01-18 02:52:44 C 23 18 36.96 +05 06 19.2 – v U69
2017-01-18 02:55:10 C 23 18 37.07 +05 06 19.7 – v U69
2017-01-18 17:48:53 C 23 19 21.43 +05 09 21.1 – U A77
2017-01-18 18:02:10 C 23 19 22.05 +05 09 23.7 – U A77
2017-01-18 18:17:33 C 23 19 22.82 +05 09 27.2 – U A77
2017-01-18 18:30:38 C 23 19 23.46 +05 09 29.5 – U A77
2017-01-18 19:49:53 C 23 19 27.36 +05 09 45.9 – q I81
2017-01-18 19:56:01 C 23 19 27.63 +05 09 47.0 – q I81
2017-01-18 20:00:07 C 23 19 27.95 +05 09 47.2 – q I81
2017-01-19 11:27:53 C 23 20 14.37 +05 13 00.5 – u 367
2017-01-19 11:36:03 C 23 20 14.74 +05 13 01.3 – u 367
2017-01-19 17:20:49 C 23 20 32.38 +05 14 14.0 – q C23
2017-01-19 17:27:48 C 23 20 32.67 +05 14 15.3 – q C23
2017-01-19 17:30:17 C 23 20 32.86 +05 14 16.5 – q C23
2017-01-19 18:45:50 C 23 20 36.62 +05 14 32.2 – q 970
2017-01-19 18:57:18 C 23 20 37.28 +05 14 34.6 – q 970
2017-01-20 17:19:20 C 23 21 46.00 +05 19 21.0 – u 209
2017-01-20 17:19:36 C 23 21 45.86 +05 19 21.3 – q C23
2017-01-20 17:21:46 C 23 21 46.12 +05 19 21.7 – u 209
2017-01-20 17:27:12 C 23 21 46.42 +05 19 22.8 – u 209
2017-01-20 17:32:05 C 23 21 46.59 +05 19 24.2 – q C23
2017-01-20 17:32:58 C 23 21 46.68 +05 19 24.1 – u 209
2017-01-20 17:38:17 C 23 21 46.86 +05 19 26.0 – t 104
2017-01-20 17:41:35 C 23 21 47.07 +05 19 26.4 – q 160
2017-01-20 17:44:33 C 23 21 47.25 +05 19 26.6 – q C23
2017-01-20 17:45:19 C 23 21 47.30 +05 19 26.8 – q 160
2017-01-20 17:49:05 C 23 21 47.47 +05 19 28.0 – q 160
2017-01-20 17:53:40 C 23 21 47.63 +05 19 29.3 – t 104
2017-01-20 18:03:16 C 23 21 48.24 +05 19 30.9 – q C23
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)