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
2013-10-31 12:11:38 C 12 31 45.16 +10 05 54.5 – t H06
2013-10-31 12:13:33 C 12 31 45.69 +10 05 46.8 – t H06
2013-10-31 12:15:31 C 12 31 46.27 +10 05 39.4 – t H06
2013-10-31 12:18:06 C 12 31 47.00 +10 05 29.5 – t H06
2013-11-01 03:25:55 C 12 36 02.00 +09 07 00.8 – r 585
2013-11-01 03:29:03 C 12 36 02.92 +09 06 48.3 – r 585
2013-11-01 03:36:42 C 12 36 05.02 +09 06 19.2 – r 585
2013-11-01 03:37:43 C 12 36 05.26 +09 06 15.9 – r 585
2013-11-01 03:38:45 C 12 36 05.53 +09 06 11.7 – r 585
2013-11-01 03:39:46 C 12 36 05.84 +09 06 08.6 – r 585
2013-11-01 03:40:47 C 12 36 06.17 +09 06 03.7 – r 585
2013-11-01 03:41:48 C 12 36 06.44 +09 05 59.4 – r 585
2013-11-01 04:46:25 C 12 36 24.53 +09 01 54.5 – w B70
2013-11-01 04:50:26 C 12 36 25.76 +09 01 39.7 – w B70
2013-11-01 04:52:44 C 12 36 26.09 +09 01 27.9 – q I81
2013-11-01 04:54:26 C 12 36 26.83 +09 01 25.4 – w B70
2013-11-01 04:59:07 C 12 36 28.34 +09 01 02.1 – v A77
2013-11-01 05:00:43 C 12 36 28.44 +09 00 59.5 – q I81
2013-11-01 05:02:43 C 12 36 29.20 +09 00 50.5 – v A77
2013-11-01 05:03:52 C 12 36 29.11 +09 00 46.3 – q I81
2013-11-01 05:06:54 C 12 36 30.30 +09 00 36.1 – v A77
2013-11-01 19:18:56 C 12 40 23.83 +08 06 42.9 – q D95
2013-11-01 19:27:13 C 12 40 26.10 +08 06 11.9 – q D95
2013-11-01 19:27:46 C 12 40 26.26 +08 06 09.0 – q D95
2013-11-02 05:53:37 C 12 43 14.76 +07 27 11.5 – c J24
2013-11-02 05:57:14 C 12 43 15.81 +07 26 56.8 – c J24
2013-11-02 06:02:05 C 12 43 17.19 +07 26 38.5 – c J24
2013-11-03 05:23:59 C 12 49 25.14 +06 00 47.2 – w J01
2013-11-03 05:27:28 C 12 49 26.16 +06 00 33.2 – w J01
2013-11-03 05:37:54 C 12 49 28.80 +05 59 56.1 – w J01
2013-11-04 19:41:18 C 12 59 05.22 +03 44 56.5 – q D95
2013-11-04 19:46:50 C 12 59 06.60 +03 44 37.3 – q D95
2013-11-04 19:47:22 C 12 59 06.73 +03 44 35.6 – q D95
2013-11-05 05:09:04 C 13 01 24.57 +03 12 12.5 – q C23
2013-11-05 05:13:43 C 13 01 25.66 +03 11 56.4 – q I81
2013-11-05 05:17:35 C 13 01 26.52 +03 11 43.7 – q I81
2013-11-05 05:17:41 C 13 01 26.73 +03 11 44.4 – q C23
2013-11-05 05:22:33 C 13 01 27.81 +03 11 26.1 – q I81
2013-11-05 05:25:14 C 13 01 28.56 +03 11 16.9 – q C23
2013-11-07 06:12:24 C 13 13 08.20 +00 28 06.3 – q G40
2013-11-07 06:22:18 C 13 13 10.50 +00 27 33.8 – q G40
2013-11-07 19:59:05 C 13 16 21.03 -00 16 29.6 – m 349
2013-11-07 20:00:50 C 13 16 21.44 -00 16 35.2 – m 349
2013-11-07 20:31:44 C 13 16 28.57 -00 18 14.4 – u 367
2013-11-07 20:33:30 C 13 16 29.01 -00 18 20.0 – u 367
2013-11-07 20:35:14 C 13 16 29.40 -00 18 26.6 – u 367
2013-11-08 05:12:23 C 13 18 29.08 -00 46 01.2 – w A06
2013-11-08 05:15:46 C 13 18 29.89 -00 46 11.4 – w A06
2013-11-08 05:19:32 C 13 18 30.82 -00 46 24.4 – w A06
2013-11-08 20:02:19 C 13 21 54.59 -01 32 58.9 – q D95
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)