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
2022-10-22 00:10:51 C 22 44 25.04 -02 57 33.2 – X W62
2022-10-22 00:23:16 C 22 44 24.69 -02 57 35.4 – X W62
2022-10-22 00:35:41 C 22 44 24.38 -02 57 37.6 – X W62
2022-10-25 19:45:33 C 22 42 07.862 -03 12 41.54 – X L81
2022-10-25 19:53:29 C 22 42 07.630 -03 12 43.49 – X L81
2022-10-28 00:50:28 C 22 40 56.53 -03 20 50.8 – X W62
2022-10-28 01:01:44 C 22 40 56.28 -03 20 52.5 – X W62
2022-10-28 01:13:00 C 22 40 55.99 -03 20 54.0 – X W62
2022-10-29 03:23:47 C 22 40 23.095 -03 24 40.28 – V G96
2022-10-29 03:31:16 C 22 40 22.944 -03 24 41.51 – V G96
2022-10-29 03:38:45 C 22 40 22.793 -03 24 42.73 – V G96
2022-10-29 03:46:16 C 22 40 22.580 -03 24 43.31 – V G96
2022-10-29 11:28:14 C 22 40 13.25 -03 25 48.8 – V D29
2022-10-29 11:48:36 C 22 40 12.80 -03 25 52.0 – V D29
2022-10-29 12:08:58 C 22 40 12.39 -03 25 54.1 – V D29
2022-11-15 02:29:16 C 22 35 03.13 -04 05 35.7 – V X03
2022-11-15 02:46:55 C 22 35 03.02 -04 05 36.7 – V X03
2022-11-15 03:01:22 C 22 35 02.94 -04 05 37.5 – V X03
2023-06-25 10:08:04 C 02 23 11.07 +20 53 58.3 – V W89
2023-06-25 10:13:17 C 02 23 11.51 +20 54 00.6 – V W89
2023-07-15 01:00:28 C 03 04 38.26 +24 56 04.3 – q 215
2023-07-15 01:02:19 C 03 04 38.52 +24 56 05.5 – q 215
2023-07-15 01:04:11 C 03 04 38.70 +24 56 06.2 – q 215
2023-07-18 02:26:28 C 03 12 03.52 +25 35 44.6 – q L27
2023-07-18 02:36:52 C 03 12 04.67 +25 35 50.3 – q L27
2023-07-18 02:38:57 C 03 12 04.92 +25 35 52.3 – q L27
2023-07-23 01:09:47 C 03 24 47.64 +26 40 50.7 – V G00
2023-07-23 01:15:07 C 03 24 48.24 +26 40 54.0 – V G00
2023-07-23 14:05:28 C 03 26 14.532 +26 48 02.75 – X F51
2023-07-23 14:13:14 C 03 26 15.402 +26 48 07.11 – X F51
2023-07-23 14:20:57 C 03 26 16.258 +26 48 11.42 – X F51
2023-07-23 14:28:45 C 03 26 17.130 +26 48 15.84 – X F51
2023-07-24 03:52:43 C 03 27 48.074 +26 55 40.30 – V G40
2023-07-24 04:25:14 C 03 27 51.689 +26 55 59.16 – V G40
2023-07-24 07:54:24 C 03 28 15.49 +26 57 53.6 – X W62
2023-07-24 08:03:25 C 03 28 16.51 +26 57 58.9 – X W62
2023-07-24 08:12:28 C 03 28 17.53 +26 58 04.1 – X W62
2023-07-24 17:43:09 C 03 29 22.836 +27 03 21.64 – q Q21
2023-07-24 17:50:42 C 03 29 23.647 +27 03 26.17 – q Q21
2023-07-25 03:11:21 C 03 30 27.982 +27 08 37.18 – V Z10
2023-07-25 03:26:09 C 03 30 29.786 +27 08 45.42 – V Z10
2023-07-28 14:25:54 C 03 40 22.209 +27 55 09.42 – X F52
2023-07-28 14:31:22 C 03 40 22.871 +27 55 12.59 – X F52
2023-07-28 14:36:50 C 03 40 23.538 +27 55 15.68 – X F52
2023-07-28 14:42:21 C 03 40 24.209 +27 55 18.82 – X F52
2023-07-28 17:29:49 C 03 40 44.81 +27 56 52.0 – m 349
2023-07-28 17:45:36 C 03 40 46.78 +27 57 00.4 – m 349
2023-07-29 17:56:42 C 03 43 46.858 +28 10 33.38 – q Q21
2023-07-29 18:15:00 C 03 43 49.258 +28 10 45.08 – q Q21
2023-07-29 18:32:17 C 03 43 51.30 +28 10 54.9 – V P87
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)