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
2017-01-29 17:15:31 C 23 33 44.72 +06 10 07.1 – o 461
2017-01-29 17:44:29 C 23 33 46.42 +06 10 14.5 – q 160
2017-01-29 17:48:12 C 23 33 46.64 +06 10 15.5 – q 160
2017-01-29 17:51:57 C 23 33 46.86 +06 10 16.6 – q 160
2017-01-29 17:53:00 C 23 33 46.80 +06 10 16.7 – q C10
2017-01-29 18:23:20 C 23 33 48.71 +06 10 24.1 – q I81
2017-01-29 18:30:39 C 23 33 49.14 +06 10 26.4 – d A77
2017-01-29 18:35:37 C 23 33 49.42 +06 10 27.0 – q I81
2017-01-29 18:43:49 C 23 33 49.99 +06 10 28.7 – q I81
2017-01-29 18:47:23 C 23 33 50.13 +06 10 30.4 – d A77
2017-01-29 18:48:40 C 23 33 50.12 +06 10 30.7 – q C10
2017-01-29 19:04:09 C 23 33 51.13 +06 10 34.7 – d A77
2017-01-29 20:10:45 C 23 33 54.93 +06 10 52.0 – q G40
2017-01-29 20:13:12 C 23 33 55.09 +06 10 53.0 – q G40
2017-01-29 20:15:44 C 23 33 55.22 +06 10 53.7 – q G40
2017-01-31 17:19:13 C 23 36 36.89 +06 22 07.5 – q 585
2017-01-31 17:20:14 C 23 36 36.94 +06 22 07.8 – q 585
2017-01-31 17:21:15 C 23 36 37.01 +06 22 08.1 – q 585
2017-01-31 17:22:17 C 23 36 37.07 +06 22 08.3 – q 585
2017-01-31 17:23:17 C 23 36 37.14 +06 22 08.6 – q 585
2017-01-31 17:24:19 C 23 36 37.19 +06 22 09.0 – q 585
2017-01-31 17:25:20 C 23 36 37.27 +06 22 09.2 – q 585
2017-01-31 17:26:21 C 23 36 37.32 +06 22 09.2 – q 585
2017-01-31 17:27:23 C 23 36 37.39 +06 22 09.5 – q 585
2017-01-31 17:28:24 C 23 36 37.45 +06 22 09.6 – q 585
2017-01-31 17:29:24 C 23 36 37.50 +06 22 10.0 – q 585
2017-01-31 17:30:26 C 23 36 37.55 +06 22 10.4 – q 585
2017-01-31 17:31:27 C 23 36 37.63 +06 22 10.7 – q 585
2017-01-31 17:32:28 C 23 36 37.69 +06 22 10.9 – q 585
2017-01-31 17:33:30 C 23 36 37.75 +06 22 11.0 – q 585
2017-02-03 12:58:33 C 23 40 45.38 +06 39 04.0 – U C42
2017-02-03 13:04:46 C 23 40 45.73 +06 39 04.5 – U C42
2017-02-03 13:11:02 C 23 40 46.12 +06 39 05.8 – U C42
2017-02-03 13:17:24 C 23 40 46.55 +06 39 07.7 – U C42
2017-02-03 19:58:16 C 23 41 11.14 +06 40 47.9 – q G40
2017-02-03 20:02:02 C 23 41 11.35 +06 40 48.8 – q G40
2017-02-03 20:09:06 C 23 41 11.78 +06 40 50.4 – q G40
2017-02-04 00:03:18 C 23 41 26.46 +06 41 47.3 – q W25
2017-02-04 00:19:51 C 23 41 27.47 +06 41 51.6 – q W25
2017-02-04 09:43:37 C 23 42 02.44 +06 44 11.0 – m 349
2017-02-04 09:56:08 C 23 42 03.22 +06 44 13.8 – m 349
2017-02-04 10:08:41 C 23 42 04.01 +06 44 17.0 – m 349
2017-02-05 18:19:57 C 23 44 04.96 +06 52 05.6 – d A77
2017-02-05 18:29:26 C 23 44 05.61 +06 52 08.0 – d A77
2017-02-05 18:37:50 C 23 44 06.12 +06 52 09.9 – d A77
2017-02-07 18:09:19 C 23 47 05.87 +07 03 17.7 – U A77
2017-02-07 18:13:56 C 23 47 05.89 +07 03 19.6 – q A77
2017-02-07 18:25:37 C 23 47 06.83 +07 03 20.8 – U A77
2017-02-07 18:28:52 C 23 47 06.85 +07 03 22.5 – q A77
2017-02-07 18:40:39 C 23 47 07.73 +07 03 25.2 – U A77
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)