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
2016-10-31 20:55:35 C 23 21 58.07 +09 22 20.0 – q 160
2016-10-31 20:57:23 C 23 21 58.01 +09 22 19.0 – U 958
2016-10-31 20:58:59 C 23 21 57.84 +09 22 18.4 – q 160
2016-10-31 21:02:11 C 23 21 57.66 +09 22 17.5 – q 160
2016-10-31 22:19:49 C 23 21 52.53 +09 21 40.2 – U A77
2016-10-31 22:32:08 C 23 21 51.69 +09 21 34.1 – U A77
2016-11-01 04:02:47 C 23 21 30.29 +09 18 59.2 – q H47
2016-11-01 04:13:48 C 23 21 29.57 +09 18 54.1 – q H47
2016-11-01 04:24:48 C 23 21 28.83 +09 18 48.8 – q H47
2016-11-01 13:06:56 C 23 20 55.06 +09 14 49.7 – q Q68
2016-11-01 13:14:04 C 23 20 54.68 +09 14 46.3 – q Q68
2016-11-02 20:12:56 C 23 18 57.63 +09 00 05.9 – q 970
2016-11-02 20:27:06 C 23 18 56.72 +08 59 59.3 – q 970
2016-11-02 20:49:22 C 23 18 55.30 +08 59 50.0 – U 958
2016-11-02 21:02:29 C 23 18 54.48 +08 59 43.3 – U 958
2016-11-02 21:15:18 C 23 18 53.62 +08 59 38.4 – U 958
2016-11-03 09:54:58 C 23 18 07.05 +08 53 46.3 – q Q21
2016-11-03 10:02:41 C 23 18 06.51 +08 53 41.9 – q Q21
2016-11-03 10:10:38 C 23 18 06.08 +08 53 37.7 – q Q21
2016-11-03 10:18:25 C 23 18 05.58 +08 53 34.7 – q Q21
2016-11-03 10:58:02 C 23 18 03.11 +08 53 16.7 – m 349
2016-11-03 11:10:53 C 23 18 02.31 +08 53 10.8 – m 349
2016-11-04 08:11:06 C 23 16 46.15 +08 43 31.0 – L T05
2016-11-04 08:31:56 C 23 16 44.76 +08 43 21.7 – L T05
2016-11-04 09:14:36 C 23 16 42.18 +08 43 02.2 – L T05
2016-11-04 09:36:22 C 23 16 40.77 +08 42 53.6 – L T05
2016-11-05 02:43:08 C 23 15 40.55 +08 35 01.1 – q H45
2016-11-05 02:45:05 C 23 15 40.44 +08 35 00.3 – q H45
2016-11-05 02:47:02 C 23 15 40.31 +08 34 59.7 – q H45
2016-11-05 02:48:47 C 23 15 40.23 +08 34 58.9 – q H45
2016-11-05 02:50:30 C 23 15 40.10 +08 34 57.9 – q H45
2016-11-05 02:52:19 C 23 15 39.99 +08 34 57.1 – q H45
2016-11-05 21:47:34 C 23 14 34.42 +08 26 22.9 – q Z78
2016-11-05 22:02:19 C 23 14 33.62 +08 26 17.1 – q J22
2016-11-05 22:06:41 C 23 14 33.36 +08 26 15.1 – q J22
2016-11-05 22:09:52 C 23 14 33.09 +08 26 12.8 – q Z78
2016-11-05 22:11:02 C 23 14 33.10 +08 26 13.2 – q J22
2016-11-05 22:15:56 C 23 14 32.70 +08 26 10.0 – q Z78
2016-11-07 12:30:36 C 23 12 25.06 +08 09 06.9 – S D88
2016-11-07 12:39:46 C 23 12 24.54 +08 09 03.3 – S D88
2016-11-07 18:02:22 C 23 12 07.35 +08 06 40.5 – q A77
2016-11-07 18:19:32 C 23 12 06.41 +08 06 32.9 – q A77
2016-11-07 18:37:32 C 23 12 05.42 +08 06 25.2 – q A77
2016-11-07 19:14:11 C 23 12 03.41 +08 06 09.1 – c A24
2016-11-07 19:15:19 C 23 12 03.40 +08 06 08.4 – c A24
2016-11-07 20:17:41 C 23 11 59.86 +08 05 40.6 – c A24
2016-11-07 20:18:43 C 23 11 59.86 +08 05 40.8 – c A24
2016-11-08 19:06:00 C 23 10 47.68 +07 55 46.0 – c A24
2016-11-08 19:07:02 C 23 10 47.56 +07 55 45.1 – c A24
2016-11-14 20:13:54 C 23 04 01.09 +06 56 18.4 – q 160
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)