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
2022-09-05 09:41:06 C 23 27 56.805 +01 16 10.85 – U F52
2022-09-05 09:59:37 C 23 27 56.010 +01 16 06.91 – U F52
2022-09-05 18:38:27 C 23 27 33.96 +01 14 12.0 – V D29
2022-09-05 19:06:27 C 23 27 32.78 +01 14 05.7 – V D29
2022-09-05 19:34:27 C 23 27 31.57 +01 13 59.5 – V D29
2022-09-06 15:06:18 C 23 26 42.07 +01 09 38.9 – V D29
2022-09-06 15:31:46 C 23 26 40.96 +01 09 33.3 – V D29
2022-09-06 15:57:13 C 23 26 39.87 +01 09 28.0 – V D29
2022-09-14 04:23:49 C 23 18 51.70 +00 27 31.1 – X W62
2022-09-14 04:34:07 C 23 18 51.26 +00 27 28.9 – X W62
2022-09-14 04:44:25 C 23 18 50.81 +00 27 26.8 – X W62
2022-09-14 12:29:26 C 23 18 30.364 +00 25 36.20 – U F52
2022-09-14 12:44:15 C 23 18 29.702 +00 25 32.67 – U F52
2022-09-14 12:59:00 C 23 18 29.051 +00 25 29.14 – U F52
2022-09-14 13:13:46 C 23 18 28.393 +00 25 25.62 – U F52
2022-09-16 02:38:01 C 23 16 50.42 +00 16 22.7 – X W62
2022-09-16 02:57:12 C 23 16 49.58 +00 16 18.3 – X W62
2022-09-16 03:15:49 C 23 16 48.75 +00 16 13.5 – X W62
2022-09-16 06:47:52 C 23 16 39.410 +00 15 22.86 – V G96
2022-09-16 06:55:59 C 23 16 39.050 +00 15 20.52 – V G96
2022-09-16 07:04:07 C 23 16 38.687 +00 15 18.58 – V G96
2022-09-16 07:12:14 C 23 16 38.323 +00 15 16.85 – V G96
2022-09-17 02:21:23 C 23 15 48.17 +00 10 36.7 – X W62
2022-09-17 02:32:39 C 23 15 47.68 +00 10 33.8 – X W62
2022-09-17 02:43:55 C 23 15 47.17 +00 10 30.8 – X W62
2022-09-17 15:30:07 C 23 15 13.66 +00 07 24.4 – V D29
2022-09-17 15:50:29 C 23 15 12.62 +00 07 19.8 – V D29
2022-09-17 16:10:51 C 23 15 11.70 +00 07 14.5 – V D29
2022-09-18 15:26:24 C 23 14 10.84 +00 01 33.6 – V D29
2022-09-18 15:27:40 C 23 14 10.77 +00 01 33.8 – V D29
2022-09-18 15:51:51 C 23 14 09.64 +00 01 27.3 – V D29
2022-09-18 15:53:08 C 23 14 09.63 +00 01 27.4 – V D29
2022-09-18 16:17:18 C 23 14 08.54 +00 01 21.0 – V D29
2022-09-18 16:18:35 C 23 14 08.49 +00 01 20.5 – V D29
2022-09-19 05:41:26 C 23 13 33.366 -00 01 56.57 – V 703
2022-09-19 05:49:37 C 23 13 33.092 -00 01 57.97 – V 703
2022-09-19 05:57:48 C 23 13 32.804 -00 01 59.84 – V 703
2022-09-19 06:05:59 C 23 13 32.387 -00 02 01.90 – V 703
2022-09-19 09:05:51 C 23 13 24.621 -00 02 45.13 – U F51
2022-09-19 09:23:01 C 23 13 23.856 -00 02 49.33 – U F51
2022-09-19 09:40:07 C 23 13 23.099 -00 02 53.51 – U F51
2022-09-19 10:06:48 C 23 13 21.910 -00 03 00.09 – U F51
2022-09-19 12:36:42 C 23 13 15.49 -00 03 36.3 – V D29
2022-09-19 12:40:31 C 23 13 15.37 -00 03 38.1 – V D29
2022-09-19 12:57:03 C 23 13 14.64 -00 03 42.2 – V D29
2022-09-19 13:00:53 C 23 13 14.43 -00 03 43.3 – V D29
2022-09-19 13:11:06 C 23 13 13.997 -00 03 43.24 – V P07
2022-09-19 13:17:25 C 23 13 13.68 -00 03 47.2 – V D29
2022-09-19 13:21:14 C 23 13 13.57 -00 03 48.0 – V D29
2022-09-19 14:38:28 C 23 13 10.118 -00 04 04.33 – V P07
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)