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
2013-09-22 03:01:16 C 05 36 33.90 +40 57 45.8 – q 160
2013-09-22 03:04:39 C 05 36 34.81 +40 57 48.9 – q 160
2013-09-22 03:06:21 C 05 36 35.20 +40 57 49.0 – w I72
2013-09-22 03:08:01 C 05 36 35.73 +40 57 51.9 – q 160
2013-09-22 03:27:06 C 05 36 41.49 +40 58 10.0 – w J24
2013-09-22 03:40:19 C 05 36 45.12 +40 58 22.5 – w I72
2013-09-22 03:44:09 C 05 36 46.16 +40 58 26.3 – w J24
2013-09-22 03:58:39 C 05 36 50.17 +40 58 39.9 – w J24
2013-09-22 04:22:41 C 05 36 56.87 +40 59 01.1 – w I72
2013-09-22 08:23:06 C 05 38 04.68 +41 02 35.3 – q H45
2013-09-22 08:25:14 C 05 38 05.33 +41 02 37.4 – q H45
2013-09-22 08:27:17 C 05 38 05.91 +41 02 39.0 – q H45
2013-09-22 08:29:06 C 05 38 06.38 +41 02 41.0 – q H45
2013-09-22 08:31:03 C 05 38 06.94 +41 02 42.9 – q H45
2013-09-22 08:56:45 C 05 38 14.14 +41 03 06.3 – q H45
2013-09-22 08:58:35 C 05 38 14.67 +41 03 07.8 – q H45
2013-09-22 09:00:18 C 05 38 15.13 +41 03 09.3 – q H45
2013-09-23 01:49:32 C 05 43 05.90 +41 18 04.5 – o B51
2013-09-23 01:51:55 C 05 43 06.39 +41 18 06.3 – q 160
2013-09-23 01:55:03 C 05 43 07.31 +41 18 09.2 – q 160
2013-09-23 01:58:11 C 05 43 08.22 +41 18 12.0 – q 160
2013-09-23 02:04:59 C 05 43 10.40 +41 18 18.3 – o B51
2013-09-23 02:19:17 C 05 43 14.60 +41 18 31.1 – o B51
2013-09-23 03:15:35 C 05 43 30.55 +41 19 19.3 – c I72
2013-09-23 03:49:39 C 05 43 41.16 +41 19 52.4 – c I72
2013-09-23 03:57:36 C 05 43 42.93 +41 19 57.5 – c A24
2013-09-23 03:57:59 C 05 43 43.13 +41 19 56.1 – c A24
2013-09-23 04:23:43 C 05 43 51.11 +41 20 22.7 – c I72
2013-09-23 10:41:06 C 05 45 42.56 +41 25 52.1 – q H45
2013-09-23 10:42:14 C 05 45 42.86 +41 25 53.2 – q H45
2013-09-23 10:45:22 C 05 45 43.81 +41 25 55.9 – q H45
2013-09-23 10:46:43 C 05 45 44.16 +41 25 56.9 – q H45
2013-09-23 10:48:25 C 05 45 44.68 +41 25 58.7 – q H45
2013-09-23 10:49:50 C 05 45 45.13 +41 26 00.0 – q H45
2013-09-23 10:51:18 C 05 45 45.56 +41 26 01.0 – q H45
2013-09-23 10:52:38 C 05 45 45.93 +41 26 02.3 – q H45
2013-09-24 02:33:49 C 05 50 31.52 +41 39 27.4 – q 160
2013-09-24 02:37:09 C 05 50 32.55 +41 39 30.3 – q 160
2013-09-24 02:40:30 C 05 50 33.58 +41 39 33.3 – q 160
2013-09-24 02:54:29 C 05 50 38.28 +41 39 46.3 – q G40
2013-09-24 03:04:13 C 05 50 41.32 +41 39 54.8 – q G40
2013-09-24 03:15:15 C 05 50 44.77 +41 40 04.3 – c I72
2013-09-24 03:17:53 C 05 50 44.95 +41 40 06.5 – c A24
2013-09-24 03:18:15 C 05 50 45.13 +41 40 05.4 – c A24
2013-09-24 03:37:21 C 05 50 51.21 +41 40 22.6 – – 442
2013-09-24 03:40:17 C 05 50 52.16 +41 40 25.3 – – 442
2013-09-24 03:49:14 C 05 50 55.17 +41 40 33.7 – c I72
2013-09-24 03:53:59 C 05 50 56.03 +41 40 34.8 – q C23
2013-09-24 04:08:31 C 05 51 00.48 +41 40 46.4 – q C23
2013-09-24 04:20:59 C 05 51 04.31 +41 40 57.4 – 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)