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
2023-08-25 10:07:56 C 05 33 04.14 +33 33 51.1 – V V38
2023-08-25 17:29:57 C 05 34 47.70 +33 36 11.6 – q Q23
2023-08-25 17:39:54 C 05 34 50.03 +33 36 14.9 – q Q23
2023-08-26 01:28:47 C 05 36 40.84 +33 38 36.8 – V G00
2023-08-26 01:30:24 C 05 36 41.20 +33 38 37.3 – V G00
2023-08-26 02:23:34 C 05 36 53.93 +33 38 53.3 – V C23
2023-08-26 02:31:52 C 05 36 55.79 +33 38 55.9 – V C23
2023-08-26 02:42:16 C 05 36 58.24 +33 38 59.2 – V C23
2023-08-27 01:11:30 C 05 42 22.80 +33 45 24.9 – Z G23
2023-08-27 01:25:52 C 05 42 26.53 +33 45 29.7 – Z G23
2023-08-27 03:39:09 C 05 42 59.026 +33 46 04.80 – V Z10
2023-08-27 03:48:23 C 05 43 01.166 +33 46 07.54 – V Z10
2023-08-27 03:56:32 C 05 43 03.230 +33 46 09.73 – V Z10
2023-08-27 11:12:12 C 05 44 50.07 +33 48 03.0 – X U94
2023-08-27 11:16:04 C 05 44 51.01 +33 48 04.2 – X U94
2023-08-27 11:21:14 C 05 44 52.27 +33 48 05.7 – X U94
2023-08-27 11:23:48 C 05 44 52.90 +33 48 06.3 – X U94
2023-08-28 02:32:34 C 05 48 38.91 +33 51 46.8 – V C23
2023-08-28 02:39:09 C 05 48 40.32 +33 51 47.9 – V C23
2023-08-28 02:43:28 C 05 48 41.23 +33 51 47.6 – V C23
2023-08-28 11:13:57 C 05 50 49.82 +33 53 43.5 – X U94
2023-08-28 11:17:50 C 05 50 50.81 +33 53 44.7 – X U94
2023-08-28 11:21:41 C 05 50 51.78 +33 53 45.4 – X U94
2023-08-28 11:24:17 C 05 50 52.44 +33 53 46.3 – X U94
2023-08-29 11:04:23 C 05 56 56.14 +33 58 24.7 – V U94
2023-08-29 11:11:28 C 05 56 57.95 +33 58 25.6 – V U94
2023-08-29 11:14:03 C 05 56 58.65 +33 58 26.3 – V U94
2023-08-29 11:19:02 C 05 56 59.95 +33 58 27.7 – X U94
2023-08-29 11:24:12 C 05 57 01.32 +33 58 28.7 – X U94
2023-08-29 11:26:46 C 05 57 01.98 +33 58 29.1 – X U94
2023-08-29 11:29:22 C 05 57 02.65 +33 58 29.5 – X U94
2023-08-29 14:16:28 C 05 57 46.068 +33 58 59.88 – V T05
2023-08-29 14:46:09 C 05 57 53.750 +33 59 05.57 – V T05
2023-08-29 15:02:22 C 05 57 58.404 +33 59 11.65 – V T05
2023-08-29 18:16:43 C 05 58 48.924 +33 59 38.62 – q Q21
2023-08-29 18:24:17 C 05 58 50.837 +33 59 39.41 – q Q21
2023-08-30 01:53:40 C 06 00 48.497 +34 00 45.61 – V I81
2023-08-30 02:06:12 C 06 00 51.905 +34 00 48.13 – V I81
2023-08-30 04:44:24 C 06 01 33.761 +34 01 15.31 – V G40
2023-08-30 05:05:16 C 06 01 39.298 +34 01 19.06 – V G40
2023-09-01 00:42:16 C 06 13 27.134 +34 05 30.91 – V I81
2023-09-01 00:52:32 C 06 13 29.988 +34 05 31.45 – V I81
2023-09-01 17:34:04 C 06 18 09.81 +34 06 08.4 – q Q23
2023-09-01 17:43:35 C 06 18 12.45 +34 06 08.9 – q Q23
2023-09-05 01:55:09 C 06 41 42.475 +33 59 00.13 – V I81
2023-09-05 02:01:15 C 06 41 44.275 +33 58 57.61 – V I81
2023-09-05 02:07:22 C 06 41 46.181 +33 58 56.96 – V I81
2023-09-05 03:19:54 C 06 42 08.280 +33 58 45.55 – X G19
2023-09-05 03:25:33 C 06 42 10.298 +33 58 44.51 – X G19
2023-09-05 11:55:39 C 06 44 46.08 +33 56 53.8 – V U94
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)