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
2013-09-09 02:35:34 C 04 30 19.76 +36 08 51.3 – w J01
2013-09-09 02:40:05 C 04 30 20.48 +36 08 54.9 – w J01
2013-09-09 02:48:52 C 04 30 21.85 +36 09 05.1 – d A77
2013-09-09 02:51:23 C 04 30 22.29 +36 09 05.4 – w J01
2013-09-09 03:06:52 C 04 30 24.73 +36 09 21.3 – d A77
2013-09-09 03:11:51 C 04 30 25.55 +36 09 23.8 – w I72
2013-09-09 03:16:00 C 04 30 26.27 +36 09 27.8 – w I72
2013-09-09 03:24:16 C 04 30 27.54 +36 09 34.6 – w I72
2013-09-09 03:24:46 C 04 30 27.72 +36 09 39.5 – d A77
2013-09-09 18:30:50 C 04 32 55.59 +36 23 00.8 – m 372
2013-09-09 18:43:14 C 04 32 57.68 +36 23 11.3 – m 372
2013-09-10 09:42:01 C 04 35 27.83 +36 36 35.1 – q H45
2013-09-10 09:44:26 C 04 35 28.26 +36 36 37.4 – q H45
2013-09-10 09:46:07 C 04 35 28.54 +36 36 38.9 – q H45
2013-09-10 09:48:05 C 04 35 28.88 +36 36 40.6 – q H45
2013-09-10 09:50:43 C 04 35 29.33 +36 36 43.0 – q H45
2013-09-10 09:53:45 C 04 35 29.82 +36 36 45.8 – q H45
2013-09-10 09:55:42 C 04 35 30.15 +36 36 47.6 – q H45
2013-09-10 09:57:35 C 04 35 30.46 +36 36 49.2 – q H45
2013-09-11 17:17:39 C 04 40 56.40 +37 05 09.6 – m 349
2013-09-11 17:24:33 C 04 40 57.60 +37 05 16.1 – m 349
2013-09-11 17:31:28 C 04 40 58.87 +37 05 22.0 – m 349
2013-09-12 03:04:15 C 04 42 41.32 +37 14 04.3 – w J01
2013-09-12 03:15:27 C 04 42 43.34 +37 14 14.6 – w J01
2013-09-12 03:22:08 C 04 42 44.50 +37 14 20.4 – w J01
2013-09-12 03:56:07 C 04 42 50.49 +37 14 51.8 – w I72
2013-09-12 04:00:19 C 04 42 51.25 +37 14 55.6 – w I72
2013-09-12 04:04:28 C 04 42 52.01 +37 14 59.7 – w I72
2013-09-12 09:26:01 C 04 43 50.49 +37 19 55.2 – q H45
2013-09-12 09:29:24 C 04 43 51.11 +37 19 58.2 – q H45
2013-09-12 09:30:39 C 04 43 51.34 +37 19 59.2 – q H45
2013-09-12 09:32:14 C 04 43 51.62 +37 20 00.9 – q H45
2013-09-12 09:33:18 C 04 43 51.78 +37 20 01.7 – q H45
2013-09-12 09:34:42 C 04 43 52.06 +37 20 03.1 – q H45
2013-09-12 09:36:11 C 04 43 52.34 +37 20 04.5 – q H45
2013-09-12 09:37:48 C 04 43 52.62 +37 20 05.9 – q H45
2013-09-13 00:24:24 C 04 46 36.36 +37 33 37.6 – q C23
2013-09-13 00:42:52 C 04 46 39.72 +37 33 54.4 – q C23
2013-09-13 00:58:15 C 04 46 42.58 +37 34 09.0 – q C23
2013-09-13 03:27:11 C 04 47 10.31 +37 36 29.3 – w I72
2013-09-13 03:35:30 C 04 47 12.01 +37 36 37.6 – w I72
2013-09-13 03:43:51 C 04 47 13.56 +37 36 45.3 – w I72
2013-09-13 23:33:54 C 04 51 01.09 +37 55 05.8 – c A77
2013-09-13 23:51:01 C 04 51 04.44 +37 55 22.5 – c A77
2013-09-14 00:07:12 C 04 51 07.51 +37 55 37.5 – c A77
2013-09-14 00:23:21 C 04 51 10.66 +37 55 52.8 – c A77
2013-09-14 01:34:46 C 04 51 24.46 +37 57 00.6 – q 470
2013-09-14 01:41:04 C 04 51 25.57 +37 57 06.1 – q 470
2013-09-14 02:30:17 C 04 51 35.09 +37 57 51.8 – q 511
2013-09-14 02:37:08 C 04 51 36.42 +37 57 58.6 – q 511
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)