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
2020-08-03 23:17:21 C 12 35 16.19 -20 25 17.9 – q Y00
2020-08-03 23:28:40 C 12 35 20.77 -20 25 46.4 – q Y00
2020-08-03 23:39:12 C 12 35 24.84 -20 26 10.2 – q Y00
2020-08-05 00:51:50 C 12 45 14.19 -21 27 57.3 – V W88
2020-08-05 00:59:48 C 12 45 17.31 -21 28 16.3 – V W88
2020-08-05 01:08:05 C 12 45 20.54 -21 28 36.3 – V W88
2020-08-06 23:12:27 C 13 03 06.10 -23 12 46.6 – q Y00
2020-08-06 23:24:38 C 13 03 10.97 -23 13 10.8 – q Y00
2020-08-06 23:38:08 C 13 03 15.83 -23 13 38.4 – q Y00
2020-08-09 23:33:56 C 13 30 16.24 -25 32 32.8 – V W88
2020-08-09 23:35:33 C 13 30 16.82 -25 32 35.7 – V W88
2020-08-09 23:37:20 C 13 30 17.53 -25 32 39.0 – V W88
2020-08-09 23:38:43 C 13 30 17.95 -25 32 41.5 – V W88
2020-08-09 23:40:22 C 13 30 18.61 -25 32 44.1 – V W88
2020-08-09 23:42:08 C 13 30 19.21 -25 32 46.8 – V W88
2020-08-09 23:43:45 C 13 30 19.85 -25 32 49.4 – V W88
2020-08-09 23:45:23 C 13 30 20.46 -25 32 53.2 – V W88
2020-08-09 23:47:11 C 13 30 21.03 -25 32 55.3 – V W88
2020-08-11 23:47:17 C 13 47 41.17 -26 50 00.0 – V W88
2020-08-11 23:59:45 C 13 47 45.55 -26 50 18.6 – V W88
2020-08-16 23:46:00 C 14 28 00.07 -29 13 27.9 – V W88
2020-08-16 23:57:15 C 14 28 03.56 -29 13 38.7 – V W88
2020-08-19 10:20:59 C 14 45 57.87 -30 01 59.1 – m 349
2020-08-19 10:24:30 C 14 45 59.02 -30 02 00.1 – m 349
2020-08-20 10:16:25 C 14 52 57.90 -30 18 14.6 – m 349
2020-08-20 10:22:05 C 14 52 59.58 -30 18 18.7 – m 349
2020-08-22 05:50:29 C 15 05 13.90 -30 43 25.5 – V T08
2020-08-22 05:56:28 C 15 05 15.48 -30 43 28.5 – V T08
2020-08-22 06:07:05 C 15 05 18.35 -30 43 34.0 – V T08
2020-08-22 06:21:42 C 15 05 22.32 -30 43 41.2 – V T08
2020-08-28 05:46:21 C 15 41 29.86 -31 33 47.2 – V T05
2020-08-28 05:51:00 C 15 41 30.84 -31 33 48.0 – V T05
2020-08-28 05:58:54 C 15 41 32.72 -31 33 50.6 – V T05
2020-08-28 06:08:30 C 15 41 34.86 -31 33 51.6 – V T05
2020-08-31 23:31:52 C 16 01 08.72 -31 46 29.6 – V X03
2020-08-31 23:36:08 C 16 01 09.55 -31 46 30.4 – V X03
2020-08-31 23:48:59 C 16 01 12.19 -31 46 31.4 – V X03
2020-09-01 00:18:50 C 16 01 18.30 -31 46 35.1 – V X03
2020-09-03 05:34:11 C 16 12 00.86 -31 49 32.0 – V T08
2020-09-03 05:46:47 C 16 12 03.34 -31 49 31.6 – V T08
2020-09-03 06:03:24 C 16 12 06.57 -31 49 32.2 – V T08
2020-09-05 06:11:41 C 16 21 14.74 -31 49 44.3 – V T05
2020-09-05 06:16:18 C 16 21 15.58 -31 49 43.9 – V T05
2020-09-05 06:24:17 C 16 21 17.05 -31 49 44.0 – V T05
2020-09-05 06:38:50 C 16 21 19.78 -31 49 44.0 – V T05
2020-09-07 05:51:14 C 16 29 49.98 -31 48 08.6 – V T08
2020-09-07 05:55:53 C 16 29 50.74 -31 48 07.9 – V T08
2020-09-07 06:03:15 C 16 29 52.05 -31 48 07.5 – V T08
2020-09-07 09:23:17 C 16 30 27.20 -31 47 51.3 – V Q62
2020-09-07 09:25:42 C 16 30 27.63 -31 47 51.2 – V Q62
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)