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
2013-08-07 23:28:26 C 03 06 09.89 +27 00 14.7 – u 585
2013-08-07 23:29:27 C 03 06 09.96 +27 00 15.6 – u 585
2013-08-07 23:30:28 C 03 06 10.02 +27 00 16.6 – u 585
2013-08-07 23:31:29 C 03 06 10.14 +27 00 16.2 – u 585
2013-08-07 23:32:29 C 03 06 10.19 +27 00 17.8 – u 585
2013-08-07 23:33:30 C 03 06 10.28 +27 00 18.0 – u 585
2013-08-07 23:34:30 C 03 06 10.36 +27 00 18.8 – u 585
2013-08-07 23:35:31 C 03 06 10.44 +27 00 19.1 – u 585
2013-08-07 23:36:31 C 03 06 10.54 +27 00 19.3 – u 585
2013-08-07 23:37:32 C 03 06 10.60 +27 00 20.6 – u 585
2013-08-07 23:38:33 C 03 06 10.68 +27 00 21.0 – u 585
2013-08-07 23:41:34 C 03 06 10.88 +27 00 22.5 – u 585
2013-08-09 20:01:26 C 03 09 46.38 +27 26 11.7 – q C42
2013-08-09 20:03:40 C 03 09 46.64 +27 26 13.0 – q C42
2013-08-09 20:05:53 C 03 09 46.75 +27 26 13.8 – q C42
2013-08-09 20:08:07 C 03 09 46.95 +27 26 15.9 – q C42
2013-08-09 20:10:20 C 03 09 47.14 +27 26 16.9 – q C42
2013-08-09 20:12:33 C 03 09 47.28 +27 26 17.9 – q C42
2013-08-09 20:14:47 C 03 09 47.48 +27 26 19.2 – q C42
2013-08-09 20:17:00 C 03 09 47.65 +27 26 20.7 – q C42
2013-08-09 20:19:13 C 03 09 47.80 +27 26 22.2 – q C42
2013-08-09 20:21:27 C 03 09 48.09 +27 26 23.8 – q C42
2013-08-09 20:23:40 C 03 09 48.13 +27 26 24.9 – q C42
2013-08-09 20:25:54 C 03 09 48.32 +27 26 26.1 – q C42
2013-08-09 20:28:07 C 03 09 48.43 +27 26 26.8 – q C42
2013-08-09 20:30:21 C 03 09 48.83 +27 26 28.6 – q C42
2013-08-09 20:32:34 C 03 09 48.93 +27 26 30.0 – q C42
2013-08-09 20:34:47 C 03 09 49.09 +27 26 31.0 – q C42
2013-08-09 20:37:01 C 03 09 49.32 +27 26 32.9 – q C42
2013-08-09 20:39:14 C 03 09 49.46 +27 26 34.0 – q C42
2013-08-09 20:41:28 C 03 09 49.69 +27 26 35.5 – q C42
2013-08-09 20:43:41 C 03 09 49.85 +27 26 36.8 – q C42
2013-08-09 20:45:56 C 03 09 50.02 +27 26 38.2 – q C42
2013-08-09 20:48:27 C 03 09 50.22 +27 26 39.0 – q C42
2013-08-09 20:50:57 C 03 09 50.38 +27 26 40.3 – q C42
2013-08-09 20:53:13 C 03 09 50.56 +27 26 42.1 – q C42
2013-08-09 20:55:30 C 03 09 50.77 +27 26 43.9 – q C42
2013-08-09 20:57:45 C 03 09 50.96 +27 26 44.6 – q C42
2013-08-09 21:00:00 C 03 09 51.13 +27 26 46.4 – q C42
2013-08-09 21:02:17 C 03 09 51.32 +27 26 47.5 – q C42
2013-08-09 21:04:33 C 03 09 51.50 +27 26 49.1 – q C42
2013-08-09 21:06:48 C 03 09 51.67 +27 26 50.4 – q C42
2013-08-09 21:09:04 C 03 09 51.88 +27 26 51.6 – q C42
2013-08-09 21:11:19 C 03 09 52.14 +27 26 53.5 – q C42
2013-08-09 21:13:33 C 03 09 52.27 +27 26 54.5 – q C42
2013-08-09 21:15:48 C 03 09 52.42 +27 26 56.1 – q C42
2013-08-09 21:18:06 C 03 09 52.61 +27 26 57.2 – q C42
2013-08-09 21:20:20 C 03 09 52.79 +27 26 58.8 – q C42
2013-08-09 21:22:34 C 03 09 52.98 +27 26 59.7 – q C42
2013-08-09 21:24:47 C 03 09 53.18 +27 27 01.0 – q C42
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)