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
2017-07-14 12:53:34 C 21 49 21.11 -23 34 50.8 – L T05
2017-07-14 13:09:10 C 21 49 19.59 -23 34 57.2 – L T05
2017-07-14 13:32:11 C 21 49 17.32 -23 35 04.3 – L T05
2017-07-15 16:59:05 C 21 46 38.20 -23 45 12.2 – q Q68
2017-07-15 17:08:00 C 21 46 37.32 -23 45 15.6 – q Q68
2017-07-16 12:15:44 C 21 44 45.70 -23 52 22.1 – L T08
2017-07-16 12:17:49 C 21 44 45.48 -23 52 22.9 – L T08
2017-07-16 12:33:12 C 21 44 43.94 -23 52 28.3 – L T08
2017-07-16 12:56:57 C 21 44 41.61 -23 52 37.2 – L T08
2017-07-17 13:57:00 C 21 42 14.84 -24 01 28.0 – q Q65
2017-07-17 14:06:12 C 21 42 13.95 -24 01 31.6 – q Q65
2017-07-17 14:15:40 C 21 42 12.96 -24 01 34.8 – q Q65
2017-07-17 14:19:55 C 21 42 12.54 -24 01 36.1 – q Q68
2017-07-17 14:28:34 C 21 42 11.67 -24 01 38.9 – q Q68
2017-07-17 14:33:46 C 21 42 11.15 -24 01 41.4 – q Q65
2017-07-18 15:34:37 C 21 39 43.07 -24 10 33.2 – m 349
2017-07-18 15:47:38 C 21 39 41.73 -24 10 37.5 – m 349
2017-07-20 12:11:53 C 21 35 17.46 -24 25 33.9 – L T08
2017-07-20 12:26:30 C 21 35 15.94 -24 25 38.3 – L T08
2017-07-20 12:30:00 C 21 35 15.61 -24 25 39.8 – L T08
2017-07-20 12:53:18 C 21 35 13.22 -24 25 47.4 – L T08
2017-07-20 15:33:59 C 21 34 57.37 -24 26 33.7 – q Q68
2017-07-20 15:42:39 C 21 34 56.47 -24 26 36.6 – q Q68
2017-07-21 12:14:11 C 21 32 53.81 -24 33 19.9 – L T08
2017-07-21 12:20:04 C 21 32 53.23 -24 33 22.0 – L T08
2017-07-21 12:27:14 C 21 32 52.48 -24 33 24.6 – L T08
2017-07-21 12:33:06 C 21 32 51.86 -24 33 26.2 – L T08
2017-07-21 12:40:59 C 21 32 51.04 -24 33 28.1 – L T08
2017-07-21 12:46:54 C 21 32 50.41 -24 33 30.7 – L T08
2017-07-21 12:54:00 C 21 32 49.73 -24 33 32.0 – L T08
2017-07-21 12:59:47 C 21 32 49.12 -24 33 34.7 – L T08
2017-07-21 15:04:02 C 21 32 36.96 -24 34 07.5 – q Q68
2017-07-21 15:13:07 C 21 32 36.03 -24 34 10.4 – q Q68
2017-07-24 11:38:55 C 21 25 46.76 -24 54 55.9 – L T08
2017-07-24 11:42:00 C 21 25 46.40 -24 54 57.9 – L T08
2017-07-24 11:53:32 C 21 25 45.23 -24 55 00.8 – L T08
2017-07-24 11:57:44 C 21 25 44.80 -24 55 01.8 – L T08
2017-07-24 12:15:11 C 21 25 43.04 -24 55 06.7 – L T08
2017-07-24 13:55:32 C 21 25 33.32 -24 55 29.1 – q Q65
2017-07-24 14:14:32 C 21 25 31.40 -24 55 34.6 – q Q65
2017-07-24 14:32:59 C 21 25 29.53 -24 55 39.9 – q Q65
2017-07-26 11:24:10 C 21 21 02.43 -25 08 04.5 – L T05
2017-07-26 11:38:55 C 21 21 00.94 -25 08 08.5 – L T05
2017-07-26 12:00:42 C 21 20 58.74 -25 08 14.0 – L T05
2017-07-26 12:13:20 C 21 20 57.45 -25 08 17.7 – L T05
2017-08-05 12:55:33 C 20 58 06.62 -25 57 05.5 – q E94
2017-08-05 13:02:45 C 20 58 06.07 -25 57 05.6 – q E94
2017-08-05 14:15:04 C 20 57 59.35 -25 57 16.7 – q E94
2017-08-12 10:29:59 C 20 44 09.87 -26 14 23.3 – L T05
2017-08-12 10:42:27 C 20 44 08.88 -26 14 25.7 – L T05
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)