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
2017-06-02 17:19:58 C 22 51 11.57 -17 48 21.4 – q Q11
2017-06-02 17:37:23 C 22 51 11.18 -17 48 24.9 – q Q11
2017-06-02 18:02:26 C 22 51 10.63 -17 48 29.6 – m 349
2017-06-02 18:16:19 C 22 51 10.28 -17 48 32.5 – m 349
2017-06-07 12:50:07 C 22 48 11.90 -18 13 22.4 – L T05
2017-06-07 13:07:58 C 22 48 11.24 -18 13 24.8 – L T05
2017-06-07 13:26:30 C 22 48 10.74 -18 13 29.5 – L T05
2017-06-07 13:44:39 C 22 48 10.10 -18 13 33.7 – L T05
2017-06-20 16:09:49 C 22 34 31.48 -19 48 22.2 – q Q68
2017-06-20 16:18:49 C 22 34 30.93 -19 48 25.5 – q Q68
2017-06-21 02:21:08 C 22 33 56.66 -19 52 09.4 – q J22
2017-06-21 02:26:43 C 22 33 56.31 -19 52 10.9 – q J22
2017-06-21 02:32:15 C 22 33 56.01 -19 52 13.2 – q J22
2017-06-22 07:20:06 C 22 32 14.15 -20 02 37.1 – U W97
2017-06-22 07:43:44 C 22 32 12.69 -20 02 45.8 – U W97
2017-06-23 17:31:47 C 22 30 07.73 -20 15 20.9 – q Q68
2017-06-23 17:40:40 C 22 30 07.15 -20 15 24.3 – q Q68
2017-06-26 02:26:58 C 22 26 24.46 -20 37 19.6 – q J22
2017-06-26 02:32:34 C 22 26 24.05 -20 37 23.1 – q J22
2017-06-26 02:38:06 C 22 26 23.71 -20 37 25.1 – q J22
2017-06-27 09:52:29 C 22 24 13.98 -20 49 42.3 – q 703
2017-06-27 09:58:12 C 22 24 13.58 -20 49 44.4 – q 703
2017-06-27 10:03:52 C 22 24 13.20 -20 49 46.7 – q 703
2017-06-27 10:09:33 C 22 24 12.79 -20 49 48.9 – q 703
2017-06-30 15:26:13 C 22 18 31.96 -21 20 43.7 – q Q68
2017-06-30 15:34:57 C 22 18 31.28 -21 20 47.2 – q Q68
2017-07-01 16:43:07 C 22 16 34.21 -21 31 02.3 – q Q68
2017-07-01 16:51:48 C 22 16 33.51 -21 31 05.4 – q Q68
2017-07-02 08:54:39 C 22 15 17.51 -21 37 46.3 – q 703
2017-07-02 09:02:26 C 22 15 16.89 -21 37 49.8 – q 703
2017-07-02 09:10:13 C 22 15 16.29 -21 37 53.3 – q 703
2017-07-02 09:18:00 C 22 15 15.63 -21 37 56.4 – q 703
2017-07-02 15:20:07 C 22 14 46.74 -21 40 17.1 – q Q68
2017-07-02 15:28:49 C 22 14 46.03 -21 40 20.5 – q Q68
2017-07-03 02:33:03 C 22 13 52.53 -21 45 00.5 – q G40
2017-07-03 03:03:08 C 22 13 50.03 -21 45 12.9 – q G40
2017-07-03 03:33:03 C 22 13 47.56 -21 45 25.3 – q G40
2017-07-06 12:13:38 C 22 07 02.01 -22 18 30.1 – L T05
2017-07-06 12:27:09 C 22 07 00.73 -22 18 35.7 – L T05
2017-07-06 12:40:40 C 22 06 59.56 -22 18 40.9 – L T05
2017-07-06 12:54:04 C 22 06 58.36 -22 18 47.0 – L T05
2017-07-07 17:44:56 C 22 04 26.91 -22 30 25.6 – q Q68
2017-07-07 17:53:58 C 22 04 26.10 -22 30 29.3 – q Q68
2017-07-08 11:08:19 C 22 02 54.60 -22 37 35.6 – L T08
2017-07-08 11:21:02 C 22 02 53.68 -22 37 40.8 – L T08
2017-07-08 11:33:37 C 22 02 52.40 -22 37 46.8 – L T08
2017-07-08 11:46:35 C 22 02 51.12 -22 37 51.0 – L T08
2017-07-13 14:37:12 C 21 51 29.27 -23 26 16.5 – q Q68
2017-07-13 14:45:55 C 21 51 28.46 -23 26 19.9 – q Q68
2017-07-14 12:49:20 C 21 49 21.54 -23 34 49.0 – 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)