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
2013-10-09 02:34:24 C 08 28 44.94 +42 06 12.1 – q G40
2013-10-09 02:35:31 C 08 28 45.52 +42 06 10.1 – q G40
2013-10-09 02:44:30 C 08 28 50.10 +42 05 56.7 – w J01
2013-10-09 02:48:16 C 08 28 52.13 +42 05 52.3 – w J01
2013-10-09 02:49:31 C 08 28 52.82 +42 05 50.8 – w J01
2013-10-09 02:55:40 C 08 28 56.67 +42 05 44.5 – v A77
2013-10-09 02:58:20 C 08 28 57.69 +42 05 39.0 – w J01
2013-10-09 03:00:26 C 08 28 59.13 +42 05 38.3 – v A77
2013-10-09 03:04:00 C 08 29 01.11 +42 05 32.1 – v A77
2013-10-09 03:51:52 C 08 29 27.87 +42 04 28.2 – v A77
2013-10-09 04:09:54 C 08 29 37.73 +42 04 04.6 – v A77
2013-10-09 04:34:13 C 08 29 51.59 +42 03 32.4 – q G40
2013-10-09 04:35:19 C 08 29 52.28 +42 03 30.4 – q G40
2013-10-09 10:42:05 C 08 33 16.56 +41 54 48.0 – t H47
2013-10-09 10:45:56 C 08 33 18.78 +41 54 43.0 – t H47
2013-10-09 10:49:46 C 08 33 20.77 +41 54 36.6 – t H47
2013-10-09 17:25:11 C 08 37 03.03 +41 44 36.6 – m 349
2013-10-09 17:31:31 C 08 37 06.56 +41 44 26.8 – m 349
2013-10-09 17:37:54 C 08 37 10.19 +41 44 17.4 – m 349
2013-10-10 00:56:38 C 08 41 16.69 +41 32 35.2 – r 585
2013-10-10 00:57:14 C 08 41 17.01 +41 32 34.4 – r 585
2013-10-10 00:58:09 C 08 41 17.52 +41 32 32.9 – r 585
2013-10-10 01:37:56 C 08 41 39.95 +41 31 24.3 – q C23
2013-10-10 01:47:37 C 08 41 45.40 +41 31 08.4 – q C23
2013-10-10 01:58:24 C 08 41 51.54 +41 30 51.0 – q C23
2013-10-10 03:05:24 C 08 42 29.35 +41 29 03.7 – w I72
2013-10-10 03:07:37 C 08 42 30.54 +41 29 00.0 – w I72
2013-10-10 03:09:50 C 08 42 31.79 +41 28 56.3 – w I72
2013-10-10 03:48:13 C 08 42 53.94 +41 27 55.3 – v A77
2013-10-10 03:55:44 C 08 42 57.89 +41 27 40.7 – d A77
2013-10-10 04:02:06 C 08 43 01.45 +41 27 31.2 – v A77
2013-10-10 04:05:08 C 08 43 03.54 +41 27 27.8 – d A77
2013-10-10 04:06:36 C 08 43 04.34 +41 27 24.6 – v A77
2013-10-10 04:11:39 C 08 43 07.04 +41 27 17.7 – v A77
2013-10-11 01:26:25 C 08 55 08.18 +40 48 41.9 – u 958
2013-10-11 01:44:53 C 08 55 18.57 +40 48 04.9 – u 958
2013-10-11 01:53:08 C 08 55 22.69 +40 47 50.4 – q C23
2013-10-11 02:01:01 C 08 55 27.23 +40 47 34.9 – q C23
2013-10-11 02:05:12 C 08 55 30.08 +40 47 27.4 – u 958
2013-10-11 02:13:39 C 08 55 34.28 +40 47 11.1 – q C23
2013-10-11 03:07:48 C 08 56 05.41 +40 45 26.8 – w I72
2013-10-11 03:08:53 C 08 56 06.03 +40 45 25.5 – w I72
2013-10-11 03:10:01 C 08 56 06.37 +40 45 22.7 – w I72
2013-10-11 03:56:40 C 08 56 33.71 +40 43 53.0 – d A77
2013-10-11 03:58:57 C 08 56 34.42 +40 43 51.2 – q A77
2013-10-11 04:01:50 C 08 56 36.61 +40 43 42.6 – d A77
2013-10-11 04:07:01 C 08 56 38.79 +40 43 35.4 – q A77
2013-10-11 04:20:06 C 08 56 46.08 +40 43 03.0 – q 987
2013-10-11 04:23:34 C 08 56 48.55 +40 43 02.7 – q G40
2013-10-11 04:24:30 C 08 56 49.06 +40 43 00.3 – q G40
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)