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
2023-09-28 04:50:13 C 09 55 34.366 +21 42 01.44 – Z 213
2023-09-29 03:49:38 C 10 03 34.09 +20 43 30.3 – – A77
2023-09-29 03:54:18 C 10 03 35.71 +20 43 18.0 – – A77
2023-09-29 03:58:58 C 10 03 37.24 +20 43 06.8 – – A77
2023-09-30 04:17:32 C 10 11 59.24 +19 39 28.3 – – A77
2023-09-30 04:20:12 C 10 12 00.12 +19 39 21.3 – – A77
2023-09-30 04:22:52 C 10 12 01.09 +19 39 14.6 – – A77
2023-10-01 02:05:15 C 10 19 24.46 +18 41 01.7 – V C40
2023-10-01 02:13:53 C 10 19 27.37 +18 40 38.6 – V C40
2023-10-01 02:22:14 C 10 19 30.21 +18 40 15.8 – V C40
2023-10-01 03:37:52 C 10 19 55.676 +18 36 49.16 – Z M09
2023-10-01 03:49:54 C 10 19 59.770 +18 36 16.56 – Z M09
2023-10-01 04:01:57 C 10 20 03.808 +18 35 44.06 – Z M09
2023-10-01 04:49:12 C 10 20 19.96 +18 33 36.1 – V J01
2023-10-01 04:57:06 C 10 20 22.57 +18 33 15.1 – V J01
2023-10-01 05:05:02 C 10 20 25.22 +18 32 53.1 – V J01
2023-10-01 19:40:10 C 10 25 20.24 +17 53 03.0 – V P87
2023-10-01 19:46:01 C 10 25 22.19 +17 52 46.3 – V P87
2023-10-01 19:58:11 C 10 25 26.11 +17 52 12.2 – q 903
2023-10-01 20:00:22 C 10 25 26.87 +17 52 07.1 – q 903
2023-10-01 20:03:46 C 10 25 28.04 +17 51 57.4 – q 903
2023-10-02 05:34:47 C 10 28 39.425 +17 25 39.25 – V G40
2023-10-02 05:45:34 C 10 28 43.039 +17 25 09.05 – V G40
2023-10-02 05:49:49 C 10 28 44.438 +17 24 57.31 – V G40
2023-10-03 03:39:10 B 10 35 59.17 +16 23 50.2 – – M18
2023-10-03 03:49:55 B 10 36 02.71 +16 23 19.9 – – M18
2023-10-03 04:00:40 B 10 36 06.25 +16 22 49.6 – – M18
2023-10-05 19:20:02 C 10 56 42.192 +13 20 33.36 – q Q21
2023-10-05 19:23:03 C 10 56 43.188 +13 20 24.36 – q Q21
2023-10-05 19:27:35 C 10 56 44.645 +13 20 11.44 – q Q21
2023-10-07 19:30:53 C 11 11 58.51 +10 57 59.1 – q D95
2023-10-07 19:34:17 C 11 11 59.61 +10 57 48.3 – q D95
2023-10-07 19:36:11 C 11 12 00.24 +10 57 42.9 – q D95
2023-10-08 04:48:16 C 11 14 53.371 +10 30 12.24 – Z 213
2023-10-08 04:52:46 C 11 14 54.768 +10 29 58.70 – Z 213
2023-10-08 04:57:16 C 11 14 56.134 +10 29 46.46 – Z 213
2023-10-09 03:09:53 C 11 21 51.51 +09 22 54.8 – o 152
2023-10-09 03:12:27 C 11 21 52.18 +09 22 48.9 – o 152
2023-10-09 03:14:36 C 11 21 53.08 +09 22 41.6 – o 152
2023-10-09 03:16:24 C 11 21 53.15 +09 22 38.4 – o 152
2023-10-11 19:37:34 C 11 41 44.21 +06 06 49.1 – q D95
2023-10-11 19:44:45 C 11 41 46.49 +06 06 27.5 – q D95
2023-10-11 20:15:23 C 11 41 55.73 +06 04 54.3 – q 903
2023-10-11 20:17:25 C 11 41 56.29 +06 04 48.5 – q 903
2023-10-11 20:19:09 C 11 41 56.91 +06 04 43.9 – q 903
2023-10-13 19:37:17 C 11 56 25.766 +03 39 15.01 – q Q21
2023-10-13 19:43:18 C 11 56 27.665 +03 38 55.97 – q Q21
2023-10-13 19:44:09 C 11 56 27.80 +03 38 53.6 – q D95
2023-10-13 19:46:02 C 11 56 28.34 +03 38 48.7 – q D95
2023-10-13 19:48:40 C 11 56 29.19 +03 38 39.4 – q D95
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)