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
2017-02-15 17:48:38 C 23 58 58.81 +07 36 20.7 – q 585
2017-02-15 17:55:17 C 23 58 59.28 +07 36 21.7 – q C23
2017-02-15 18:17:02 C 23 59 00.52 +07 36 23.3 – q C10
2017-02-15 18:17:54 C 23 59 00.58 +07 36 23.0 – q C23
2017-02-15 18:35:44 C 23 59 01.55 +07 36 24.5 – q C10
2017-02-15 18:45:31 C 23 59 01.94 +07 36 24.3 – q K40
2017-02-15 18:48:05 C 23 59 02.32 +07 36 26.5 – q C23
2017-02-15 18:51:41 C 23 59 02.25 +07 36 25.7 – q K40
2017-02-15 18:57:30 C 23 59 02.81 +07 36 27.4 – q C10
2017-02-16 01:06:59 C 23 59 24.27 +07 36 54.9 – q V83
2017-02-16 01:15:23 C 23 59 24.76 +07 36 59.6 – q V83
2017-02-16 01:27:46 C 23 59 25.40 +07 37 00.9 – q V83
2017-02-16 18:34:20 C 00 00 24.48 +07 38 06.2 – q 215
2017-02-16 18:38:02 C 00 00 24.61 +07 38 06.9 – q 215
2017-02-16 18:41:43 C 00 00 24.83 +07 38 07.3 – q 215
2017-02-16 20:00:12 C 00 00 29.31 +07 38 11.2 – q J22
2017-02-16 20:03:53 C 00 00 29.53 +07 38 11.0 – q J22
2017-02-16 20:07:22 C 00 00 29.71 +07 38 10.9 – q J22
2017-02-17 18:43:56 C 00 01 45.28 +07 38 51.3 – q B92
2017-02-17 18:49:20 C 00 01 45.58 +07 38 51.4 – q B92
2017-02-17 18:54:44 C 00 01 45.85 +07 38 51.6 – q B92
2017-02-17 19:05:32 C 00 01 46.42 +07 38 51.8 – q B92
2017-02-17 19:10:56 C 00 01 46.69 +07 38 51.3 – q B92
2017-02-18 00:40:24 C 00 02 04.37 +07 38 53.4 – q 850
2017-02-18 00:57:26 C 00 02 05.27 +07 38 54.3 – q 850
2017-02-18 17:59:12 C 00 02 59.40 +07 38 37.5 – q C23
2017-02-18 18:02:13 C 00 02 59.65 +07 38 37.1 – q C77
2017-02-18 18:12:42 C 00 03 00.19 +07 38 36.6 – q C77
2017-02-18 18:15:22 C 00 03 00.20 +07 38 37.4 – q C23
2017-02-18 18:32:36 C 00 03 01.13 +07 38 36.2 – q C23
2017-02-18 18:33:40 C 00 03 01.28 +07 38 36.4 – q C77
2017-02-18 18:34:50 C 00 03 01.33 +07 38 36.4 – d A77
2017-02-18 18:39:52 C 00 03 01.40 +07 38 37.1 – d A77
2017-02-18 18:40:23 C 00 03 01.60 +07 38 36.1 – d A77
2017-02-18 18:45:19 C 00 03 01.82 +07 38 37.1 – d A77
2017-02-18 18:47:45 C 00 03 01.90 +07 38 36.1 – d A77
2017-02-18 18:48:36 C 00 03 02.05 +07 38 37.3 – d A77
2017-02-18 18:53:30 C 00 03 02.37 +07 38 35.7 – d A77
2017-02-18 18:55:46 C 00 03 02.27 +07 38 35.9 – d A77
2017-02-18 18:58:50 C 00 03 02.50 +07 38 35.4 – q B92
2017-02-18 18:59:00 C 00 03 02.53 +07 38 36.1 – d A77
2017-02-18 19:04:14 C 00 03 02.87 +07 38 35.7 – q B92
2017-02-18 19:09:39 C 00 03 03.17 +07 38 36.1 – q B92
2017-02-18 19:51:38 C 00 03 05.20 +07 38 35.5 – q G40
2017-02-18 19:58:15 C 00 03 05.48 +07 38 35.6 – q G40
2017-02-19 00:54:38 C 00 03 20.69 +07 38 21.4 – q H45
2017-02-19 00:56:06 C 00 03 20.81 +07 38 21.4 – q H45
2017-02-19 00:58:14 C 00 03 20.90 +07 38 21.2 – q H45
2017-02-19 01:00:58 C 00 03 21.04 +07 38 21.0 – q H45
2017-02-19 01:02:53 C 00 03 21.14 +07 38 20.8 – q H45
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)