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
2016-12-12 02:41:48 C 22 52 51.449 +04 13 15.40 – U 695
2016-12-12 02:47:12 C 22 52 51.474 +04 13 14.86 – U 695
2016-12-12 02:52:40 C 22 52 51.497 +04 13 14.28 – U 695
2016-12-12 02:58:01 C 22 52 51.518 +04 13 13.68 – U 695
2016-12-12 03:03:23 C 22 52 51.542 +04 13 13.10 – U 695
2016-12-12 03:08:42 C 22 52 51.565 +04 13 12.50 – U 695
2016-12-12 03:14:03 C 22 52 51.588 +04 13 11.98 – U 695
2016-12-12 03:19:46 C 22 52 51.611 +04 13 11.33 – U 695
2016-12-12 03:25:05 C 22 52 51.633 +04 13 10.76 – U 695
2016-12-12 03:30:27 C 22 52 51.650 +04 13 10.17 – U 695
2016-12-12 03:35:46 C 22 52 51.676 +04 13 09.64 – U 695
2016-12-12 03:41:05 C 22 52 51.705 +04 13 09.01 – U 695
2016-12-14 18:01:51 C 22 53 19.49 +04 07 16.0 – d A77
2016-12-14 18:26:21 C 22 53 19.68 +04 07 13.9 – d A77
2016-12-14 18:50:54 C 22 53 19.87 +04 07 12.0 – d A77
2016-12-16 17:25:47 C 22 53 49.74 +04 03 51.6 – q K77
2016-12-16 17:36:05 C 22 53 49.86 +04 03 51.2 – q K77
2016-12-17 09:39:29 C 22 54 01.82 +04 02 56.3 – m 372
2016-12-17 10:14:30 C 22 54 02.23 +04 02 54.3 – m 372
2016-12-17 18:14:00 C 22 54 08.66 +04 02 26.5 – q A71
2016-12-17 18:15:39 C 22 54 08.72 +04 02 26.5 – q 160
2016-12-17 18:18:57 C 22 54 08.79 +04 02 28.3 – q 160
2016-12-17 18:22:15 C 22 54 08.82 +04 02 28.0 – q 160
2016-12-17 18:28:19 C 22 54 08.87 +04 02 26.8 – q A71
2016-12-20 01:25:15 C 22 54 58.44 +04 00 13.3 – q H45
2016-12-20 01:28:11 C 22 54 58.48 +04 00 13.1 – q H45
2016-12-20 01:30:59 C 22 54 58.54 +04 00 13.0 – q H45
2016-12-21 12:33:52 C 22 55 35.65 +03 59 24.6 – U C42
2016-12-21 12:52:32 C 22 55 35.93 +03 59 24.3 – U C42
2016-12-21 13:09:31 C 22 55 36.28 +03 59 24.0 – U C42
2016-12-21 13:26:35 C 22 55 36.58 +03 59 23.7 – U C42
2016-12-21 13:43:45 C 22 55 36.85 +03 59 23.5 – U C42
2016-12-21 14:01:00 C 22 55 37.11 +03 59 23.2 – U C42
2016-12-21 18:01:58 C 22 55 41.62 +03 59 20.2 – q A77
2016-12-21 18:41:28 C 22 55 42.36 +03 59 19.7 – q A77
2016-12-22 05:14:01 C 22 55 54.42 +03 59 15.0 – L T05
2016-12-22 05:30:17 C 22 55 54.72 +03 59 14.0 – L T05
2016-12-22 05:48:54 C 22 55 54.97 +03 59 15.2 – L T05
2016-12-22 06:06:14 C 22 55 55.38 +03 59 14.3 – L T05
2016-12-22 17:57:37 C 22 56 09.64 +03 59 06.2 – q 215
2016-12-22 18:00:24 C 22 56 09.69 +03 59 06.3 – q 215
2016-12-22 18:03:10 C 22 56 09.72 +03 59 06.4 – q 215
2016-12-23 18:46:53 C 22 56 40.53 +03 59 07.9 – q 160
2016-12-23 18:50:05 C 22 56 40.61 +03 59 07.4 – q 160
2016-12-23 18:53:29 C 22 56 40.71 +03 59 07.4 – q 160
2016-12-26 01:00:25 C 22 57 55.03 +04 00 04.1 – q W96
2016-12-26 01:44:43 C 22 57 55.97 +04 00 04.8 – q W96
2016-12-26 18:43:09 C 22 58 21.41 +04 00 28.7 – q C23
2016-12-26 18:59:47 C 22 58 21.80 +04 00 29.1 – q C23
2016-12-26 19:10:10 C 22 58 22.09 +04 00 29.4 – 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)