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
2022-09-19 15:47:06 C 23 13 07.042 -00 04 21.68 – V P07
2022-09-19 16:56:34 C 23 13 04.022 -00 04 38.42 – V P07
2022-09-21 01:42:03 C 23 11 38.78 -00 12 45.4 – X W62
2022-09-21 01:57:49 C 23 11 38.06 -00 12 49.3 – X W62
2022-09-21 02:12:28 C 23 11 37.43 -00 12 53.5 – X W62
2022-09-21 03:09:51 C 23 11 34.88 -00 13 02.7 – q X03
2022-09-21 03:22:41 C 23 11 34.28 -00 13 06.0 – q X03
2022-09-21 03:35:32 C 23 11 33.71 -00 13 09.3 – q X03
2022-09-21 03:48:21 C 23 11 33.15 -00 13 12.0 – q X03
2022-09-21 09:27:56 C 23 11 18.449 -00 14 38.63 – U F51
2022-09-21 09:46:11 C 23 11 17.640 -00 14 43.11 – U F51
2022-09-21 10:04:32 C 23 11 16.828 -00 14 47.66 – U F51
2022-09-21 10:22:52 C 23 11 16.020 -00 14 52.16 – U F51
2022-09-24 02:26:47 C 23 08 30.60 -00 30 39.7 – V W62
2022-09-24 02:36:22 C 23 08 30.20 -00 30 42.5 – V W62
2022-09-24 02:45:23 C 23 08 29.79 -00 30 44.5 – V W62
2022-09-26 04:57:14 C 23 06 21.859 -00 43 03.65 – V G96
2022-09-26 05:23:41 C 23 06 20.740 -00 43 10.24 – V G96
2022-09-26 05:31:43 C 23 06 20.380 -00 43 12.07 – V G96
2022-09-26 08:48:31 C 23 06 12.079 -00 43 59.80 – U F52
2022-09-26 09:05:04 C 23 06 11.365 -00 44 04.14 – U F52
2022-09-26 09:21:43 C 23 06 10.651 -00 44 07.92 – U F52
2022-09-26 09:38:24 C 23 06 09.935 -00 44 12.03 – U F52
2022-09-27 19:57:30 C 23 04 43.72 -00 52 35.7 – V G00
2022-09-27 20:09:57 C 23 04 43.12 -00 52 37.2 – V G00
2022-09-29 14:33:19 C 23 02 58.15 -01 02 55.4 – V D29
2022-09-29 14:53:40 C 23 02 57.34 -01 03 00.6 – V D29
2022-09-29 15:14:02 C 23 02 56.47 -01 03 06.4 – V D29
2022-10-01 06:53:07 C 23 01 20.024 -01 12 36.11 – U F51
2022-10-01 07:11:02 C 23 01 19.291 -01 12 40.42 – U F51
2022-10-01 07:28:52 C 23 01 18.557 -01 12 44.75 – U F51
2022-10-02 20:19:48 C 22 59 50.51 -01 21 31.4 – X C95
2022-10-02 20:29:33 C 22 59 49.99 -01 21 32.8 – X C95
2022-10-03 19:12:09 C 22 58 56.54 -01 26 53.1 – v A77
2022-10-03 19:22:59 C 22 58 56.14 -01 26 56.6 – v A77
2022-10-03 19:31:39 C 22 58 55.77 -01 26 57.6 – v A77
2022-10-14 06:59:35 C 22 49 53.744 -02 22 23.31 – U F52
2022-10-14 07:16:10 C 22 49 53.185 -02 22 26.85 – U F52
2022-10-14 07:32:40 C 22 49 52.644 -02 22 30.18 – U F52
2022-10-14 07:49:13 C 22 49 52.093 -02 22 33.57 – U F52
2022-10-18 06:31:07 C 22 46 55.916 -02 41 13.29 – U F51
2022-10-18 06:49:14 C 22 46 55.360 -02 41 16.65 – U F51
2022-10-18 07:07:21 C 22 46 54.815 -02 41 20.13 – U F51
2022-10-18 07:25:35 C 22 46 54.260 -02 41 23.57 – U F51
2022-10-19 00:23:17 C 22 46 24.59 -02 44 35.8 – X W62
2022-10-19 00:33:32 C 22 46 24.28 -02 44 37.9 – X W62
2022-10-19 00:43:45 C 22 46 23.99 -02 44 39.9 – X W62
2022-10-21 03:36:13 C 22 44 58.13 -02 53 53.0 – V W76
2022-10-21 03:41:04 C 22 44 57.99 -02 53 53.9 – V W76
2022-10-21 03:45:53 C 22 44 57.85 -02 53 54.8 – V W76
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)