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
2017-01-26 18:21:46 C 23 29 38.26 +05 52 42.4 – q B92
2017-01-26 18:27:26 C 23 29 38.72 +05 52 43.9 – c B96
2017-01-26 18:28:04 C 23 29 38.63 +05 52 43.3 – q B92
2017-01-26 18:28:54 C 23 29 38.66 +05 52 44.2 – q I81
2017-01-26 18:29:39 C 23 29 38.72 +05 52 44.2 – q B92
2017-01-26 18:29:47 C 23 29 38.84 +05 52 44.3 – c B96
2017-01-26 18:31:14 C 23 29 38.81 +05 52 44.9 – q B92
2017-01-26 18:32:09 C 23 29 38.97 +05 52 44.5 – c B96
2017-01-26 18:32:49 C 23 29 38.87 +05 52 45.1 – q B92
2017-01-26 18:34:24 C 23 29 38.97 +05 52 45.2 – q B92
2017-01-26 18:34:29 C 23 29 39.09 +05 52 45.4 – c B96
2017-01-26 18:35:01 C 23 29 38.94 +05 52 45.4 – q C10
2017-01-26 18:35:59 C 23 29 39.11 +05 52 46.1 – q B92
2017-01-26 18:36:50 C 23 29 39.22 +05 52 45.5 – c B96
2017-01-26 18:37:33 C 23 29 39.11 +05 52 46.5 – q B92
2017-01-26 18:39:10 C 23 29 39.37 +05 52 45.8 – c B96
2017-01-26 18:42:17 C 23 29 39.44 +05 52 47.4 – q B92
2017-01-26 18:43:14 C 23 29 39.50 +05 52 47.1 – q I81
2017-01-26 18:49:22 C 23 29 39.79 +05 52 49.0 – q I81
2017-01-27 18:19:16 C 23 31 00.42 +05 58 31.2 – q 215
2017-01-27 18:21:07 C 23 31 00.42 +05 58 33.2 – q 215
2017-01-27 18:22:58 C 23 31 00.55 +05 58 33.6 – q 215
2017-01-28 08:59:21 C 23 31 51.23 +06 02 08.4 – m 349
2017-01-28 09:04:20 C 23 31 51.53 +06 02 10.2 – m 349
2017-01-28 10:28:58 C 23 31 56.43 +06 02 30.6 – u 367
2017-01-28 10:33:21 C 23 31 56.65 +06 02 31.0 – u 367
2017-01-28 16:57:35 C 23 32 19.21 +06 04 05.2 – o 461
2017-01-28 17:01:14 C 23 32 19.44 +06 04 06.4 – o 461
2017-01-28 17:04:54 C 23 32 19.62 +06 04 07.4 – o 461
2017-01-28 17:08:32 C 23 32 19.86 +06 04 08.2 – o 461
2017-01-28 18:36:47 C 23 32 24.90 +06 04 29.9 – q 215
2017-01-28 18:38:38 C 23 32 24.93 +06 04 31.2 – q 215
2017-01-28 18:40:29 C 23 32 24.95 +06 04 32.5 – q 215
2017-01-28 18:47:08 C 23 32 25.44 +06 04 31.9 – Q J08
2017-01-28 19:00:02 C 23 32 26.27 +06 04 36.9 – Q J08
2017-01-28 19:11:20 C 23 32 26.95 +06 04 38.9 – Q J08
2017-01-28 19:21:19 C 23 32 27.48 +06 04 40.7 – q 970
2017-01-28 19:24:35 C 23 32 27.59 +06 04 43.2 – q 970
2017-01-28 23:57:40 C 23 32 43.74 +06 05 49.8 – q W34
2017-01-29 00:07:33 C 23 32 44.32 +06 05 52.7 – q W34
2017-01-29 00:17:31 C 23 32 44.80 +06 05 56.6 – q W34
2017-01-29 01:48:42 C 23 32 50.10 +06 06 18.1 – v H06
2017-01-29 01:51:00 C 23 32 50.23 +06 06 18.5 – v H06
2017-01-29 17:00:55 C 23 33 43.87 +06 10 03.3 – o 461
2017-01-29 17:02:43 C 23 33 43.92 +06 10 04.2 – o 461
2017-01-29 17:04:33 C 23 33 44.08 +06 10 04.1 – o 461
2017-01-29 17:06:23 C 23 33 44.12 +06 10 05.0 – o 461
2017-01-29 17:08:13 C 23 33 44.30 +06 10 05.7 – o 461
2017-01-29 17:10:02 C 23 33 44.40 +06 10 05.7 – o 461
2017-01-29 17:13:41 C 23 33 44.63 +06 10 06.5 – o 461
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)