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
2023-10-13 19:50:52 C 11 56 29.959 +03 38 32.89 – q Q21
2024-07-05 13:57:59 C 22 41 23.722 -11 32 43.10 – X F51
2024-07-05 14:08:31 C 22 41 23.418 -11 32 44.77 – X F51
2024-07-05 14:18:48 C 22 41 23.114 -11 32 46.31 – X F51
2024-07-05 14:29:04 C 22 41 22.811 -11 32 47.85 – X F51
2024-07-15 06:17:36 C 22 33 43.682 -12 13 28.81 – V W68
2024-07-15 06:20:13 C 22 33 43.579 -12 13 28.45 – V W68
2024-07-15 06:24:45 C 22 33 43.380 -12 13 29.06 – V W68
2024-07-15 06:59:55 C 22 33 42.072 -12 13 36.26 – V W68
2024-07-28 10:44:35 C 22 20 06.961 -13 22 26.44 – X F51
2024-07-28 11:00:27 C 22 20 06.190 -13 22 30.14 – X F51
2024-07-28 11:16:16 C 22 20 05.416 -13 22 33.83 – X F51
2024-07-28 11:32:08 C 22 20 04.642 -13 22 37.52 – X F51
2024-07-29 00:04:24 C 22 19 28.57 -13 25 34.7 – q 215
2024-07-29 00:08:08 C 22 19 28.38 -13 25 36.0 – q 215
2024-07-29 00:11:52 C 22 19 28.21 -13 25 37.2 – q 215
2024-07-30 17:42:51 C 22 17 27.04 -13 35 23.5 – V D29
2024-07-30 18:14:24 C 22 17 25.46 -13 35 30.9 – V D29
2024-07-30 18:44:34 C 22 17 23.96 -13 35 38.1 – V D29
2024-08-01 12:30:50 C 22 15 19.749 -13 45 33.40 – X F52
2024-08-01 12:47:55 C 22 15 18.877 -13 45 37.40 – X F52
2024-08-01 13:05:07 C 22 15 17.998 -13 45 41.46 – X F52
2024-08-01 13:22:09 C 22 15 17.132 -13 45 45.40 – X F52
2024-08-01 23:18:19 C 22 14 47.364 -13 48 05.15 – V M22
2024-08-01 23:53:14 C 22 14 45.595 -13 48 12.89 – V M22
2024-08-01 23:56:33 C 22 14 45.422 -13 48 12.46 – V M22
2024-08-02 00:01:10 C 22 14 45.199 -13 48 13.93 – V M22
2024-08-18 23:14:17 B 21 53 28.29 -15 23 14.5 – V Y87
2024-08-18 23:30:47 B 21 53 27.04 -15 23 17.6 – V Y87
2024-08-18 23:47:04 B 21 53 26.23 -15 23 21.4 – V Y87
2024-08-27 08:41:41 C 21 43 09.618 -16 04 12.86 – X F51
2024-08-27 09:01:16 C 21 43 08.630 -16 04 16.60 – X F51
2024-08-27 09:20:52 C 21 43 07.642 -16 04 20.30 – X F51
2024-08-27 09:40:28 C 21 43 06.650 -16 04 23.96 – X F51
2024-09-04 04:40:54 C 21 34 17.195 -16 36 30.82 – V G96
2024-09-04 04:49:00 C 21 34 16.892 -16 36 32.44 – V G96
2024-09-04 04:57:07 C 21 34 16.482 -16 36 33.66 – V G96
2024-09-04 05:05:13 C 21 34 16.100 -16 36 34.63 – V G96
2024-09-04 08:32:20 C 21 34 06.865 -16 37 06.09 – X F52
2024-09-04 08:46:32 C 21 34 06.225 -16 37 08.27 – X F52
2024-09-04 09:14:54 C 21 34 04.934 -16 37 12.66 – X F52
2024-09-07 09:16:44 C 21 30 57.659 -16 47 46.08 – X F51
2024-09-07 09:33:44 C 21 30 56.925 -16 47 48.43 – X F51
2024-09-07 09:50:43 C 21 30 56.192 -16 47 50.76 – X F51
2024-09-25 07:23:13 C 21 16 17.742 -17 29 34.51 – X F51
2024-09-25 07:26:56 C 21 16 17.646 -17 29 34.63 – X F51
2024-09-25 07:40:14 C 21 16 17.292 -17 29 35.29 – X F51
2024-09-25 07:43:57 C 21 16 17.189 -17 29 35.55 – X F51
2024-09-25 07:57:14 C 21 16 16.848 -17 29 36.24 – X F51
2024-09-25 08:00:57 C 21 16 16.750 -17 29 36.51 – X F51
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)