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
2013-11-08 20:05:38 C 13 21 55.25 -01 33 08.4 – q D95
2013-11-09 05:18:16 C 13 24 01.53 -02 01 52.9 – w B96
2013-11-09 05:21:52 C 13 24 02.36 -02 02 01.6 – w B96
2013-11-09 05:25:27 C 13 24 03.11 -02 02 14.9 – w B96
2013-11-09 05:29:00 C 13 24 04.06 -02 02 28.4 – w B96
2013-11-10 04:37:49 C 13 29 21.00 -03 13 37.8 – q A71
2013-11-10 04:38:57 C 13 29 21.18 -03 13 41.4 – q A71
2013-11-10 04:40:04 C 13 29 21.46 -03 13 44.4 – q A71
2013-11-10 04:41:12 C 13 29 21.70 -03 13 47.8 – q A71
2013-11-10 04:42:16 C 13 29 21.99 -03 13 51.9 – q A71
2013-11-10 04:43:24 C 13 29 22.23 -03 13 55.4 – q A71
2013-11-10 12:22:14 C 13 31 06.83 -03 37 05.5 – q 448
2013-11-10 12:27:05 C 13 31 07.94 -03 37 20.4 – q 448
2013-11-10 12:32:46 C 13 31 09.25 -03 37 37.3 – q 448
2013-11-10 12:36:39 C 13 31 10.11 -03 37 48.7 – q 448
2013-11-10 12:39:22 C 13 31 10.70 -03 37 56.8 – q 448
2013-11-11 05:25:07 C 13 34 59.56 -04 28 17.9 – q C23
2013-11-11 05:26:12 C 13 34 59.83 -04 28 21.5 – q C23
2013-11-11 05:27:16 C 13 35 00.04 -04 28 23.5 – q C23
2013-11-12 05:15:00 C 13 40 26.08 -05 38 37.0 – w B20
2013-11-12 05:17:28 C 13 40 26.74 -05 38 44.6 – w B20
2013-11-12 05:19:58 C 13 40 27.16 -05 38 49.5 – w B20
2013-11-12 20:17:34 C 13 43 53.61 -06 22 20.3 – m 349
2013-11-12 20:20:36 C 13 43 54.30 -06 22 29.3 – m 349
2013-11-12 20:23:33 C 13 43 54.99 -06 22 37.7 – m 349
2013-11-15 20:17:45 C 14 00 52.51 -09 45 10.0 – m 349
2013-11-15 20:20:32 C 14 00 53.19 -09 45 17.6 – m 349
2013-11-15 20:23:20 C 14 00 53.88 -09 45 25.4 – m 349
2013-11-15 20:34:45 C 14 00 56.66 -09 46 00.0 – m 372
2013-11-15 20:37:35 C 14 00 57.37 -09 46 07.8 – m 372
2013-11-16 20:10:49 C 14 06 44.93 -10 50 14.1 – m 349
2013-11-16 20:15:29 C 14 06 46.12 -10 50 27.4 – m 349
2013-11-16 20:17:47 C 14 06 46.70 -10 50 33.3 – m 349
2013-11-17 20:16:14 C 14 12 49.89 -11 54 43.1 – m 349
2013-11-17 20:18:34 C 14 12 50.51 -11 54 49.5 – m 349
2013-11-17 20:20:53 C 14 12 51.11 -11 54 56.0 – m 349
2013-11-19 20:22:20 C 14 25 29.98 -13 59 42.0 – m 349
2013-11-19 20:23:52 C 14 25 30.38 -13 59 45.9 – m 349
2013-11-19 20:25:22 C 14 25 30.72 -13 59 49.1 – m 349
2013-11-20 20:33:07 C 14 32 08.44 -15 00 20.8 – m 349
2013-11-20 20:34:21 C 14 32 08.68 -15 00 23.0 – m 349
2013-11-20 20:35:38 C 14 32 09.14 -15 00 25.4 – m 349
2014-04-28 09:16:59 C 22 31 30.87 -13 37 07.7 – q W96
2014-04-28 09:44:24 C 22 31 31.78 -13 37 02.5 – q W96
2014-06-26 13:05:01 C 22 42 06.197 -12 38 58.56 – L F51
2014-06-26 13:07:58 C 22 42 06.118 -12 38 58.92 – L F51
2014-06-26 13:22:22 C 22 42 05.792 -12 39 00.79 – L F51
2014-06-26 13:25:17 C 22 42 05.717 -12 39 01.13 – L F51
2014-06-26 13:39:40 C 22 42 05.378 -12 39 03.15 – L F51
2014-06-26 13:42:36 C 22 42 05.308 -12 39 03.48 – L F51
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)