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
2017-01-23 09:42:50 C 23 25 09.96 +05 33 42.5 – q Q11
2017-01-23 09:46:54 C 23 25 10.19 +05 33 43.1 – q Q11
2017-01-23 10:00:00 C 23 25 10.90 +05 33 45.8 – m 372
2017-01-23 18:29:26 C 23 25 38.70 +05 35 39.6 – q I81
2017-01-23 18:37:39 C 23 25 39.06 +05 35 43.7 – q I81
2017-01-23 18:47:53 C 23 25 39.62 +05 35 45.5 – q I81
2017-01-23 18:51:40 C 23 25 39.65 +05 35 48.5 – w J01
2017-01-23 18:56:53 C 23 25 40.04 +05 35 49.7 – w J01
2017-01-24 10:24:05 C 23 26 30.58 +05 39 24.8 – q Q11
2017-01-24 10:28:40 C 23 26 30.82 +05 39 25.7 – q Q11
2017-01-24 16:46:50 C 23 26 51.77 +05 40 54.0 – o 461
2017-01-24 16:50:48 C 23 26 52.00 +05 40 54.2 – o 461
2017-01-24 16:54:46 C 23 26 52.18 +05 40 55.7 – o 461
2017-01-24 18:50:08 C 23 26 58.58 +05 41 22.6 – q K02
2017-01-24 19:01:16 C 23 26 59.08 +05 41 25.7 – q K02
2017-01-24 19:12:24 C 23 26 59.77 +05 41 27.7 – q K02
2017-01-24 19:17:04 C 23 27 00.00 +05 41 28.5 – q Z80
2017-01-24 19:24:29 C 23 27 00.40 +05 41 31.0 – q Z80
2017-01-25 09:38:50 C 23 27 47.75 +05 44 52.9 – q Q11
2017-01-25 09:41:34 C 23 27 47.83 +05 44 53.3 – u D81
2017-01-25 09:42:23 C 23 27 47.96 +05 44 53.9 – q Q11
2017-01-25 09:42:33 C 23 27 47.97 +05 44 54.0 – q Q11
2017-01-25 09:47:04 C 23 27 48.22 +05 44 54.1 – u D81
2017-01-25 09:52:35 C 23 27 48.61 +05 44 54.9 – u D81
2017-01-25 17:42:19 C 23 28 14.83 +05 46 46.8 – q C23
2017-01-25 18:01:01 C 23 28 15.84 +05 46 51.4 – q C23
2017-01-25 18:09:28 C 23 28 16.25 +05 46 54.9 – q 160
2017-01-25 18:13:05 C 23 28 16.43 +05 46 56.0 – q 160
2017-01-25 18:16:42 C 23 28 16.65 +05 46 56.3 – q 160
2017-01-25 18:21:48 C 23 28 17.03 +05 46 56.8 – q C23
2017-01-25 18:40:12 C 23 28 18.07 +05 47 00.5 – Q J08
2017-01-25 19:07:33 C 23 28 19.51 +05 47 07.3 – Q J08
2017-01-25 19:35:22 C 23 28 20.97 +05 47 14.5 – Q J08
2017-01-26 09:38:30 C 23 29 08.57 +05 50 36.1 – q Q11
2017-01-26 09:42:33 C 23 29 08.81 +05 50 37.2 – q Q11
2017-01-26 09:45:00 C 23 29 08.95 +05 50 37.7 – q Q11
2017-01-26 09:51:43 C 23 29 09.28 +05 50 39.2 – q Q11
2017-01-26 16:50:40 C 23 29 33.14 +05 52 19.9 – o 461
2017-01-26 16:54:39 C 23 29 33.37 +05 52 20.7 – o 461
2017-01-26 16:55:07 C 23 29 33.32 +05 52 21.1 – q 583
2017-01-26 16:58:37 C 23 29 33.56 +05 52 22.0 – o 461
2017-01-26 16:59:57 C 23 29 33.57 +05 52 22.4 – q 583
2017-01-26 17:05:52 C 23 29 33.90 +05 52 23.7 – q 583
2017-01-26 17:10:46 C 23 29 34.17 +05 52 24.8 – q 583
2017-01-26 17:47:27 C 23 29 36.31 +05 52 34.1 – q 160
2017-01-26 17:51:27 C 23 29 36.51 +05 52 35.0 – q 160
2017-01-26 17:54:35 C 23 29 36.72 +05 52 35.3 – q C10
2017-01-26 17:55:25 C 23 29 36.74 +05 52 35.9 – q 160
2017-01-26 18:13:35 C 23 29 37.78 +05 52 40.1 – q C10
2017-01-26 18:20:09 C 23 29 38.15 +05 52 42.5 – q B92
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)