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
2015-07-30 12:00:18 C 23 26 33.461 -01 38 32.99 – L F51
2015-07-30 12:17:26 C 23 26 33.018 -01 38 34.77 – L F51
2015-08-09 08:42:37 C 23 19 56.47 -02 09 31.7 – R G45
2015-08-09 08:51:18 C 23 19 56.21 -02 09 33.6 – R G45
2015-08-09 08:59:56 C 23 19 55.92 -02 09 34.8 – R G45
2015-08-09 09:00:01 C 23 19 55.90 -02 09 35.1 – R G45
2015-08-09 09:08:46 C 23 19 55.63 -02 09 36.6 – R G45
2015-08-13 00:35:10 C 23 17 06.73 -02 23 27.5 – q 215
2015-08-13 00:37:00 C 23 17 06.69 -02 23 27.4 – q 215
2015-08-13 00:38:51 C 23 17 06.67 -02 23 27.7 – q 215
2015-08-13 08:43:17 C 23 16 50.46 -02 24 46.9 – R G45
2015-08-13 08:52:10 C 23 16 50.18 -02 24 48.4 – R G45
2015-08-13 09:00:45 C 23 16 49.86 -02 24 50.2 – R G45
2015-08-13 09:08:56 C 23 16 49.59 -02 24 50.9 – R G45
2015-08-14 08:38:30 C 23 16 02.09 -02 28 48.2 – R G45
2015-08-14 08:46:04 C 23 16 01.86 -02 28 49.6 – R G45
2015-08-14 09:00:49 C 23 16 01.32 -02 28 51.9 – R G45
2015-08-14 09:11:38 C 23 16 00.98 -02 28 53.7 – R G45
2015-08-15 08:47:44 C 23 15 12.51 -02 32 57.3 – R G45
2015-08-15 08:55:01 C 23 15 12.26 -02 32 57.8 – R G45
2015-08-15 09:05:44 C 23 15 11.85 -02 32 59.6 – R G45
2015-08-15 09:12:52 C 23 15 11.60 -02 33 00.5 – R G45
2015-08-17 14:10:57 C 23 13 20.27 -02 42 20.5 – u Q60
2015-08-17 14:24:49 C 23 13 19.75 -02 42 22.8 – u Q60
2015-08-17 14:38:41 C 23 13 19.26 -02 42 25.9 – u Q60
2015-08-21 06:44:01 C 23 10 06.80 -02 58 51.8 – o 691
2015-08-21 07:11:08 C 23 10 05.79 -02 58 56.7 – o 691
2015-08-21 07:38:13 C 23 10 04.77 -02 59 02.1 – o 691
2015-08-22 06:51:41 C 23 09 12.73 -03 03 30.9 – V G45
2015-08-22 07:15:49 C 23 09 11.73 -03 03 35.3 – V G45
2015-08-22 07:31:05 C 23 09 11.18 -03 03 37.8 – V G45
2015-08-22 07:46:32 C 23 09 10.55 -03 03 41.4 – V G45
2015-08-22 08:01:29 C 23 09 09.96 -03 03 44.0 – V G45
2015-08-22 08:14:40 C 23 09 09.50 -03 03 46.8 – V G45
2015-08-22 09:45:48 C 23 09 06.05 -03 04 04.5 – V G45
2015-08-22 09:46:00 C 23 09 06.01 -03 04 04.6 – V G45
2015-09-06 04:56:24 C 22 55 03.00 -04 18 07.0 – q 703
2015-09-06 05:07:19 C 22 55 02.64 -04 18 08.2 – q 703
2015-09-06 05:29:11 C 22 55 01.92 -04 18 13.8 – q 703
2015-09-06 09:39:29 C 22 54 51.39 -04 19 08.0 – o 691
2015-09-06 10:06:34 C 22 54 50.18 -04 19 14.4 – o 691
2015-09-06 10:33:36 C 22 54 49.15 -04 19 19.8 – o 691
2015-09-06 15:13:15 C 22 54 37.95 -04 20 20.6 – q D29
2015-09-06 15:38:39 C 22 54 36.92 -04 20 25.9 – q D29
2015-09-06 16:04:03 C 22 54 35.85 -04 20 31.9 – q D29
2015-09-09 07:42:37 C 22 52 00.853 -04 34 23.35 – L F51
2015-09-09 07:44:37 C 22 52 00.774 -04 34 23.85 – L F51
2015-09-09 08:00:09 C 22 52 00.131 -04 34 27.21 – L F51
2015-09-09 08:02:10 C 22 52 00.050 -04 34 27.62 – L F51
2015-09-09 08:17:36 C 22 51 59.413 -04 34 31.03 – 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)