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
2014-08-14 11:12:35 C 21 48 55.733 -16 56 32.71 – L F51
2014-08-14 11:30:27 C 21 48 54.687 -16 56 36.78 – L F51
2014-08-15 09:46:22 C 21 47 38.584 -17 01 36.57 – L F51
2014-08-15 10:03:29 C 21 47 37.585 -17 01 40.52 – L F51
2014-08-15 10:20:36 C 21 47 36.592 -17 01 44.30 – L F51
2014-08-15 10:37:44 C 21 47 35.595 -17 01 48.13 – L F51
2014-08-15 10:59:13 C 21 47 34.354 -17 01 52.83 – L F51
2014-08-15 11:17:01 C 21 47 33.316 -17 01 56.80 – L F51
2014-08-15 11:34:49 C 21 47 32.283 -17 02 00.79 – L F51
2014-08-15 11:52:41 C 21 47 31.249 -17 02 04.71 – L F51
2014-08-19 12:26:35 C 21 42 04.31 -17 22 51.3 – q D95
2014-08-19 12:30:42 C 21 42 04.09 -17 22 52.8 – q D95
2014-08-19 12:47:06 C 21 42 03.14 -17 22 56.3 – q D95
2014-08-24 09:58:10 C 21 35 37.897 -17 45 55.51 – L F51
2014-08-24 10:13:25 C 21 35 37.065 -17 45 58.18 – L F51
2014-08-24 10:28:43 C 21 35 36.232 -17 46 01.06 – L F51
2014-08-24 10:43:56 C 21 35 35.399 -17 46 03.90 – L F51
2014-08-25 09:54:40 C 21 34 21.375 -17 50 17.93 – L F51
2014-08-25 10:09:54 C 21 34 20.553 -17 50 20.69 – L F51
2014-08-25 10:25:08 C 21 34 19.731 -17 50 23.43 – L F51
2014-08-25 10:40:23 C 21 34 18.907 -17 50 26.20 – L F51
2014-09-02 06:22:26 C 21 24 53.14 -18 20 35.4 – q 703
2014-09-02 06:36:22 C 21 24 52.41 -18 20 37.1 – q 703
2014-09-02 06:50:16 C 21 24 51.72 -18 20 39.4 – q 703
2014-09-02 07:04:13 C 21 24 51.03 -18 20 41.2 – q 703
2014-09-11 07:33:00 C 21 15 31.474 -18 45 56.65 – L F51
2014-09-11 07:49:00 C 21 15 30.841 -18 45 58.06 – L F51
2014-09-11 08:04:18 C 21 15 30.233 -18 45 59.57 – L F51
2014-09-11 08:19:33 C 21 15 29.634 -18 46 01.04 – L F51
2014-09-24 04:53:34 C 21 05 37.50 -19 05 04.8 – q G96
2014-09-24 05:03:08 C 21 05 37.27 -19 05 05.4 – q G96
2014-09-24 05:12:43 C 21 05 37.01 -19 05 05.6 – q G96
2014-09-24 05:22:16 C 21 05 36.80 -19 05 05.7 – q G96
2015-07-22 13:12:04 C 23 30 43.69 -01 20 55.3 – 1 T09
2015-07-22 13:54:01 C 23 30 42.86 -01 20 58.4 – 1 T09
2015-07-22 14:14:54 C 23 30 42.45 -01 21 00.0 – 1 T09
2015-07-22 14:35:48 C 23 30 42.04 -01 21 01.5 – 1 T09
2015-07-23 12:09:06 C 23 30 17.078 -01 22 41.01 – L F51
2015-07-23 12:26:35 C 23 30 16.720 -01 22 42.43 – L F51
2015-07-23 12:44:02 C 23 30 16.360 -01 22 43.77 – L F51
2015-07-23 13:01:32 C 23 30 16.011 -01 22 45.16 – L F51
2015-07-23 13:34:31 C 23 30 15.32 -01 22 47.7 – 1 T09
2015-07-23 13:55:25 C 23 30 14.89 -01 22 49.4 – 1 T09
2015-07-23 14:16:22 C 23 30 14.46 -01 22 51.0 – 1 T09
2015-07-23 14:37:24 C 23 30 14.03 -01 22 52.7 – 1 T09
2015-07-28 18:58:01 C 23 27 32.69 -01 34 11.6 – q D29
2015-07-28 19:22:08 C 23 27 32.08 -01 34 14.1 – q D29
2015-07-28 19:46:16 C 23 27 31.50 -01 34 17.0 – q D29
2015-07-30 11:26:09 C 23 26 34.321 -01 38 29.22 – L F51
2015-07-30 11:43:14 C 23 26 33.890 -01 38 31.05 – 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)