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
2016-11-25 04:19:43 S 22 56 07.88 +05 32 56.2 – L C51
2016-11-25 05:53:58 S 22 56 05.75 +05 32 29.2 – L C51
2016-11-25 07:28:24 S 22 56 03.64 +05 32 02.4 – L C51
2016-11-25 09:02:39 S 22 56 01.56 +05 31 35.8 – L C51
2016-11-25 11:28:01 C 22 55 58.23 +05 30 51.7 – q Q11
2016-11-25 11:30:04 C 22 55 58.16 +05 30 51.6 – q Q11
2016-11-25 12:11:20 S 22 55 57.41 +05 30 42.6 – L C51
2016-11-25 15:19:50 S 22 55 53.31 +05 29 49.6 – L C51
2016-11-25 15:20:01 S 22 55 53.30 +05 29 49.3 – L C51
2016-11-25 18:28:31 S 22 55 49.25 +05 28 57.0 – L C51
2016-11-25 18:38:02 C 22 55 49.10 +05 28 49.9 – c B96
2016-11-25 18:40:26 C 22 55 49.06 +05 28 49.6 – c B96
2016-11-25 18:42:50 C 22 55 48.88 +05 28 48.6 – c B96
2016-11-25 18:45:12 C 22 55 48.81 +05 28 48.3 – c B96
2016-11-25 18:47:37 C 22 55 48.74 +05 28 47.6 – c B96
2016-11-25 18:49:59 C 22 55 48.72 +05 28 46.8 – c B96
2016-11-27 17:50:02 C 22 54 53.56 +05 16 10.0 – U 958
2016-11-27 18:01:41 C 22 54 53.33 +05 16 06.9 – U 958
2016-11-27 18:13:21 C 22 54 53.12 +05 16 03.8 – U 958
2016-11-27 19:23:40 C 22 54 51.68 +05 15 45.7 – q A71
2016-11-27 19:37:43 C 22 54 51.46 +05 15 41.8 – q A71
2016-11-27 19:51:44 C 22 54 51.11 +05 15 38.0 – q A71
2016-11-28 10:57:00 C 22 54 35.59 +05 11 49.3 – m 372
2016-11-28 11:17:30 C 22 54 35.25 +05 11 44.5 – m 372
2016-11-28 18:13:46 C 22 54 28.57 +05 09 59.5 – c B96
2016-11-28 18:16:10 C 22 54 28.51 +05 09 59.1 – c B96
2016-11-28 18:18:32 C 22 54 28.49 +05 09 58.6 – c B96
2016-11-28 18:20:57 C 22 54 28.45 +05 09 57.9 – c B96
2016-11-28 18:23:19 C 22 54 28.41 +05 09 56.7 – c B96
2016-11-28 18:25:43 C 22 54 28.37 +05 09 55.8 – c B96
2016-11-28 18:43:18 C 22 54 28.00 +05 09 52.1 – q A71
2016-11-28 18:58:49 C 22 54 27.79 +05 09 48.0 – q A71
2016-11-28 19:11:46 C 22 54 27.60 +05 09 44.9 – q A71
2016-11-28 19:24:42 C 22 54 27.30 +05 09 42.1 – q A71
2016-11-28 19:33:26 C 22 54 27.23 +05 09 38.7 – q K02
2016-11-28 19:44:02 C 22 54 27.05 +05 09 37.0 – q K02
2016-11-29 16:51:50 C 22 54 07.75 +05 04 30.1 – q A71
2016-11-29 17:08:51 C 22 54 07.50 +05 04 25.8 – q A71
2016-11-29 17:28:44 C 22 54 07.18 +05 04 21.5 – q A71
2016-11-29 17:48:36 C 22 54 06.91 +05 04 17.0 – q A71
2016-11-29 18:16:38 C 22 54 06.60 +05 04 10.1 – c B96
2016-11-29 18:19:02 C 22 54 06.56 +05 04 09.4 – c B96
2016-11-29 18:21:25 C 22 54 06.50 +05 04 09.1 – c B96
2016-11-29 18:23:49 C 22 54 06.41 +05 04 08.0 – c B96
2016-11-29 18:26:11 C 22 54 06.37 +05 04 07.4 – c B96
2016-11-29 18:28:35 C 22 54 06.34 +05 04 06.8 – c B96
2016-11-30 17:46:14 C 22 53 47.49 +04 58 43.6 – d A77
2016-11-30 18:10:39 C 22 53 47.14 +04 58 38.1 – d A77
2016-11-30 18:35:04 C 22 53 46.81 +04 58 32.6 – d A77
2016-11-30 19:27:42 C 22 53 46.08 +04 58 20.9 – 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)