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
2023-07-29 18:45:35 C 03 43 53.02 +28 11 02.3 – V P87
2023-08-05 03:08:06 C 04 04 13.34 +29 36 38.6 – X C95
2023-08-05 03:27:25 C 04 04 16.24 +29 36 49.2 – X C95
2023-08-05 14:11:30 C 04 05 48.365 +29 42 51.30 – V T05
2023-08-05 14:16:04 C 04 05 49.063 +29 42 55.44 – V T05
2023-08-05 14:32:27 C 04 05 51.326 +29 43 03.00 – V T05
2023-08-05 14:44:55 C 04 05 53.114 +29 43 10.24 – V T05
2023-08-06 03:03:59 C 04 07 39.96 +29 50 01.2 – X C95
2023-08-06 03:16:25 C 04 07 41.69 +29 50 09.1 – X C95
2023-08-06 03:28:51 C 04 07 43.51 +29 50 15.0 – X C95
2023-08-08 02:17:58 C 04 14 40.870 +30 16 15.31 – V I81
2023-08-08 02:24:19 C 04 14 41.794 +30 16 17.72 – V I81
2023-08-13 18:24:18 C 04 36 44.58 +31 29 48.5 – V P87
2023-08-13 18:35:31 C 04 36 46.61 +31 29 54.9 – V P87
2023-08-13 18:45:35 C 04 36 48.33 +31 29 59.5 – V P87
2023-08-14 01:40:09 C 04 38 00.264 +31 33 32.98 – V I81
2023-08-14 02:41:20 C 04 38 11.081 +31 34 05.77 – V Z10
2023-08-14 02:47:05 C 04 38 12.089 +31 34 09.62 – V Z10
2023-08-14 02:56:18 C 04 38 13.649 +31 34 14.99 – V Z10
2023-08-14 03:11:07 C 04 38 16.17 +31 34 22.1 – q A77
2023-08-14 03:20:05 C 04 38 17.69 +31 34 28.2 – q A77
2023-08-15 01:08:50 C 04 42 08.976 +31 45 39.92 – V I81
2023-08-15 01:16:57 C 04 42 10.438 +31 45 44.42 – V I81
2023-08-15 01:25:02 C 04 42 11.856 +31 45 48.31 – V I81
2023-08-15 01:31:04 C 04 42 13.01 +31 45 52.3 – V G00
2023-08-15 01:32:51 C 04 42 13.32 +31 45 53.7 – V G00
2023-08-15 01:34:38 C 04 42 13.64 +31 45 54.5 – V G00
2023-08-15 01:36:25 C 04 42 13.95 +31 45 55.3 – V G00
2023-08-15 01:38:11 C 04 42 14.27 +31 45 55.8 – V G00
2023-08-15 01:39:57 C 04 42 14.57 +31 45 57.0 – V G00
2023-08-15 01:41:45 C 04 42 14.83 +31 45 58.0 – V G00
2023-08-15 03:01:03 C 04 42 29.07 +31 46 40.1 – q L27
2023-08-15 03:05:18 C 04 42 29.81 +31 46 42.3 – q L27
2023-08-15 03:09:03 C 04 42 30.48 +31 46 44.0 – q L27
2023-08-15 04:05:07 C 04 42 40.79 +31 47 13.1 – V Z17
2023-08-15 04:08:25 C 04 42 41.16 +31 47 14.7 – V Z17
2023-08-17 03:11:45 C 04 51 19.59 +32 10 46.1 – q 215
2023-08-17 03:13:37 C 04 51 19.94 +32 10 47.0 – q 215
2023-08-17 03:15:28 C 04 51 20.30 +32 10 47.7 – q 215
2023-08-18 02:10:44 C 04 55 42.530 +32 21 52.16 – Z 213
2023-08-18 02:26:45 C 04 55 45.593 +32 22 00.34 – Z 213
2023-08-18 02:42:10 C 04 55 48.437 +32 22 06.96 – Z 213
2023-08-18 03:55:29 C 04 56 02.734 +32 22 42.17 – V G40
2023-08-18 04:35:26 C 04 56 10.303 +32 23 02.22 – V G40
2023-08-19 06:40:31 C 05 01 17.19 +32 35 11.1 – X W62
2023-08-19 06:44:48 C 05 01 18.04 +32 35 13.1 – X W62
2023-08-19 06:49:07 C 05 01 18.90 +32 35 15.2 – X W62
2023-08-19 17:08:07 C 05 03 22.59 +32 39 58.2 – q Q23
2023-08-19 17:21:42 C 05 03 25.32 +32 40 04.6 – q Q23
2023-08-20 02:34:22 C 05 05 16.94 +32 44 11.7 – q L27
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)