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
2013-08-18 04:58:28 C 03 27 15.31 +29 30 07.1 – w J24
2013-08-18 05:06:11 C 03 27 16.02 +29 30 13.1 – w J24
2013-08-18 05:11:21 C 03 27 16.42 +29 30 17.0 – w J24
2013-08-18 17:47:16 C 03 28 27.22 +29 38 29.0 – m 349
2013-08-18 18:06:20 C 03 28 28.93 +29 38 40.7 – m 349
2013-08-19 03:26:47 C 03 29 21.67 +29 44 46.7 – w I72
2013-08-19 03:35:01 C 03 29 22.48 +29 44 51.9 – w I72
2013-08-19 03:43:13 C 03 29 23.22 +29 44 57.9 – w I72
2013-08-19 09:32:25 C 03 29 56.25 +29 48 48.7 – q H45
2013-08-19 09:34:04 C 03 29 56.43 +29 48 48.9 – q H45
2013-08-19 09:36:29 C 03 29 56.65 +29 48 50.2 – q H45
2013-08-19 09:38:13 C 03 29 56.83 +29 48 51.5 – q H45
2013-08-19 09:40:41 C 03 29 57.05 +29 48 53.3 – q H45
2013-08-19 09:42:16 C 03 29 57.21 +29 48 54.0 – q H45
2013-08-19 09:45:00 C 03 29 57.44 +29 48 56.4 – q H45
2013-08-19 09:48:35 C 03 29 57.76 +29 48 58.6 – q H45
2013-08-20 01:46:03 C 03 31 29.19 +29 59 29.4 – q C10
2013-08-20 02:14:16 C 03 31 31.83 +29 59 48.0 – q C10
2013-08-20 02:41:18 C 03 31 34.42 +30 00 05.8 – q C10
2013-08-20 03:55:34 C 03 31 41.55 +30 00 56.8 – w I72
2013-08-20 03:59:41 C 03 31 41.95 +30 00 59.5 – w I72
2013-08-20 04:03:54 C 03 31 42.32 +30 01 02.5 – w I72
2013-08-20 04:16:26 C 03 31 43.52 +30 01 10.9 – w I72
2013-08-20 04:20:35 C 03 31 43.90 +30 01 13.3 – w I72
2013-08-21 09:06:13 C 03 34 31.90 +30 20 31.0 – q H45
2013-08-21 09:12:29 C 03 34 32.49 +30 20 35.6 – q H45
2013-08-21 09:29:46 C 03 34 34.19 +30 20 47.2 – q H45
2013-08-23 03:46:58 C 03 38 48.14 +30 49 41.5 – w I72
2013-08-23 04:03:35 C 03 38 49.78 +30 49 52.9 – w I72
2013-08-23 04:07:44 C 03 38 50.24 +30 49 57.5 – w I72
2013-08-23 04:11:53 C 03 38 50.64 +30 49 58.8 – w I72
2013-08-23 04:16:02 C 03 38 51.01 +30 50 01.2 – w I72
2013-08-25 03:34:05 C 03 43 46.35 +31 23 13.4 – w I72
2013-08-25 03:42:19 C 03 43 47.08 +31 23 18.6 – w I72
2013-08-25 03:46:27 C 03 43 47.56 +31 23 22.3 – w I72
2013-08-25 17:01:14 C 03 45 12.67 +31 32 49.6 – q D95
2013-08-25 17:07:25 C 03 45 13.28 +31 32 53.7 – q D95
2013-08-25 17:08:58 C 03 45 13.49 +31 32 55.2 – q D95
2013-08-26 03:30:53 C 03 46 20.62 +31 40 23.5 – w I72
2013-08-26 03:39:08 C 03 46 21.52 +31 40 29.3 – w I72
2013-08-26 04:12:20 C 03 46 25.06 +31 40 53.3 – w I72
2013-08-27 04:04:02 C 03 49 02.39 +31 58 15.2 – w I72
2013-08-27 04:08:11 C 03 49 02.86 +31 58 18.4 – w I72
2013-08-27 04:12:19 C 03 49 03.29 +31 58 21.2 – w I72
2013-08-27 04:16:27 C 03 49 03.74 +31 58 24.2 – w I72
2013-08-27 04:20:38 C 03 49 04.23 +31 58 27.5 – w I72
2013-08-27 10:10:12 C 03 49 43.25 +32 02 45.4 – t H47
2013-08-27 10:41:56 C 03 49 46.74 +32 03 08.0 – t H47
2013-08-29 23:14:57 C 03 56 46.02 +32 48 28.1 – q C23
2013-08-29 23:44:52 C 03 56 49.44 +32 48 51.3 – q C23
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)