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
2013-08-09 21:27:01 C 03 09 53.36 +27 27 02.4 – q C42
2013-08-09 21:29:14 C 03 09 53.55 +27 27 03.6 – q C42
2013-08-11 00:07:18 C 03 12 05.53 +27 42 49.4 – c C32
2013-08-11 00:12:53 C 03 12 06.04 +27 42 52.8 – c C32
2013-08-11 00:18:36 C 03 12 06.47 +27 42 56.2 – c C32
2013-08-12 01:39:29 C 03 14 13.97 +27 58 04.9 – q C23
2013-08-12 01:43:39 C 03 14 14.32 +27 58 08.0 – q C23
2013-08-12 01:49:53 C 03 14 14.79 +27 58 11.7 – q C23
2013-08-12 08:55:06 C 03 14 50.67 +28 02 34.7 – q W96
2013-08-12 09:23:42 C 03 14 53.13 +28 02 53.3 – q W96
2013-08-12 17:56:30 C 03 15 36.75 +28 07 59.3 – m 372
2013-08-12 18:10:54 C 03 15 37.98 +28 08 08.8 – m 372
2013-08-14 03:21:18 C 03 18 29.32 +28 28 25.2 – w I72
2013-08-14 03:26:01 C 03 18 29.80 +28 28 27.6 – w I72
2013-08-14 03:43:43 C 03 18 31.32 +28 28 38.9 – w I72
2013-08-16 00:00:56 C 03 22 25.86 +28 56 16.2 – u C36
2013-08-16 00:04:26 C 03 22 26.16 +28 56 19.0 – u C36
2013-08-16 00:07:57 C 03 22 26.47 +28 56 20.3 – u C36
2013-08-16 00:13:14 C 03 22 26.90 +28 56 23.1 – u C36
2013-08-16 00:53:58 C 03 22 30.56 +28 56 47.4 – q C23
2013-08-16 01:01:42 C 03 22 31.28 +28 56 53.0 – q C23
2013-08-16 01:17:25 C 03 22 32.72 +28 57 01.5 – q C23
2013-08-16 03:24:14 C 03 22 44.05 +28 58 24.6 – w I72
2013-08-16 03:28:22 C 03 22 44.46 +28 58 26.8 – w I72
2013-08-16 03:32:29 C 03 22 44.76 +28 58 29.1 – w I72
2013-08-16 03:36:35 C 03 22 45.05 +28 58 32.1 – w I72
2013-08-17 02:11:05 C 03 24 47.66 +29 12 52.5 – q 160
2013-08-17 02:12:04 C 03 24 47.75 +29 12 53.1 – q 160
2013-08-17 02:13:03 C 03 24 47.83 +29 12 53.8 – q 160
2013-08-17 03:24:15 C 03 24 54.29 +29 13 39.4 – w I72
2013-08-17 03:28:24 C 03 24 54.66 +29 13 42.1 – w I72
2013-08-17 03:32:34 C 03 24 55.04 +29 13 44.7 – w I72
2013-08-17 03:36:42 C 03 24 55.44 +29 13 47.3 – w I72
2013-08-18 01:33:52 C 03 26 56.44 +29 27 54.6 – u 585
2013-08-18 01:34:55 C 03 26 56.56 +29 27 55.2 – u 585
2013-08-18 01:36:57 C 03 26 56.75 +29 27 56.1 – u 585
2013-08-18 01:38:59 C 03 26 56.96 +29 27 57.3 – u 585
2013-08-18 01:41:01 C 03 26 57.00 +29 27 59.7 – u 585
2013-08-18 02:54:35 C 03 27 04.24 +29 28 48.6 – d A77
2013-08-18 02:59:03 C 03 27 04.52 +29 28 50.7 – d A77
2013-08-18 03:01:47 C 03 27 04.71 +29 28 52.5 – d A77
2013-08-18 03:02:44 C 03 27 04.75 +29 28 53.4 – d A77
2013-08-18 03:09:50 C 03 27 05.35 +29 28 57.8 – d A77
2013-08-18 03:10:41 C 03 27 05.52 +29 28 58.0 – d A77
2013-08-18 03:17:17 C 03 27 05.97 +29 29 02.3 – d A77
2013-08-18 03:20:06 C 03 27 06.34 +29 29 03.7 – w I72
2013-08-18 03:21:10 C 03 27 06.50 +29 29 05.6 – d A77
2013-08-18 03:24:33 C 03 27 06.87 +29 29 08.1 – d A77
2013-08-18 03:32:26 C 03 27 07.45 +29 29 11.8 – w I72
2013-08-18 03:57:10 C 03 27 09.72 +29 29 27.9 – w I72
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)