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
2013-10-16 02:58:25 C 10 02 48.07 +35 22 11.0 – w I72
2013-10-16 04:00:27 C 10 03 21.17 +35 18 47.3 – q G40
2013-10-16 04:27:56 C 10 03 35.78 +35 17 12.6 – – 442
2013-10-16 04:33:57 C 10 03 38.91 +35 16 52.0 – – 442
2013-10-16 05:19:12 C 10 04 03.16 +35 14 21.2 – q G40
2013-10-16 05:58:55 C 10 04 24.18 +35 12 07.1 – q G40
2013-10-16 06:00:01 C 10 04 24.73 +35 12 03.0 – q G40
2013-10-16 19:10:44 C 10 11 22.51 +34 26 11.5 – m 372
2013-10-16 19:29:45 C 10 11 32.49 +34 25 04.1 – m 372
2013-10-17 02:22:14 C 10 15 08.23 +34 00 23.6 – q A71
2013-10-17 02:33:44 C 10 15 14.09 +33 59 42.2 – q A71
2013-10-17 03:19:24 C 10 15 38.02 +33 56 59.0 – q G40
2013-10-17 03:20:32 C 10 15 38.72 +33 56 55.3 – q G40
2013-10-17 03:27:58 C 10 15 42.12 +33 56 27.5 – w I72
2013-10-17 03:29:07 C 10 15 42.83 +33 56 22.8 – w I72
2013-10-17 03:30:18 C 10 15 43.30 +33 56 17.8 – w I72
2013-10-17 03:48:22 C 10 15 53.10 +33 55 15.1 – q A77
2013-10-17 03:57:56 C 10 15 57.87 +33 54 40.9 – q A77
2013-10-17 03:59:12 C 10 15 58.72 +33 54 36.6 – q G40
2013-10-17 04:00:20 C 10 15 59.30 +33 54 33.0 – q G40
2013-10-17 04:03:50 C 10 16 00.94 +33 54 18.1 – q A77
2013-10-17 04:59:38 C 10 16 30.06 +33 50 59.6 – q G40
2013-10-17 05:00:46 C 10 16 30.71 +33 50 55.0 – q G40
2013-10-17 14:18:55 C 10 21 18.06 +33 16 48.2 – o F65
2013-10-17 14:20:15 C 10 21 18.63 +33 16 44.6 – o F65
2013-10-17 19:11:08 C 10 23 47.25 +32 58 34.0 – q D95
2013-10-17 19:13:54 C 10 23 48.65 +32 58 23.1 – q D95
2013-10-17 19:14:59 C 10 23 49.22 +32 58 19.1 – q D95
2013-10-18 04:12:42 C 10 28 21.00 +32 24 21.1 – q 204
2013-10-18 04:14:52 C 10 28 22.17 +32 24 12.3 – q 204
2013-10-18 04:17:05 C 10 28 23.29 +32 24 03.8 – q 204
2013-10-18 04:22:11 C 10 28 26.13 +32 23 42.9 – w J38
2013-10-18 04:22:31 C 10 28 26.37 +32 23 41.0 – w J38
2013-10-18 04:23:11 C 10 28 26.66 +32 23 39.9 – w J38
2013-10-19 04:43:38 C 10 40 27.75 +30 48 24.4 – q C23
2013-10-19 04:47:47 C 10 40 29.64 +30 48 08.3 – q C23
2013-10-19 04:51:56 C 10 40 31.85 +30 47 50.6 – q C23
2013-10-20 03:24:02 C 10 51 15.89 +29 16 16.7 – r 585
2013-10-20 03:26:07 C 10 51 16.83 +29 16 09.1 – r 585
2013-10-20 03:27:08 C 10 51 17.21 +29 16 05.3 – r 585
2013-10-20 03:28:12 C 10 51 17.82 +29 16 00.5 – r 585
2013-10-20 03:29:13 C 10 51 18.25 +29 15 56.7 – r 585
2013-10-20 03:30:17 C 10 51 18.67 +29 15 52.3 – r 585
2013-10-20 03:31:19 C 10 51 19.16 +29 15 48.4 – r 585
2013-10-20 18:50:12 C 10 58 24.00 +28 12 05.2 – m 349
2013-10-20 18:52:37 C 10 58 25.07 +28 11 55.4 – m 349
2013-10-21 11:46:41 C 11 06 00.39 +27 00 29.2 – v H06
2013-10-21 11:48:39 C 11 06 01.25 +27 00 20.9 – v H06
2013-10-22 04:21:38 C 11 13 14.47 +25 49 26.0 – q A77
2013-10-22 04:29:13 C 11 13 17.54 +25 48 55.3 – q A77
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)