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
2000-09-15 22:18:05 s 2 -0.0098038 3 -0.0030023 2563.0 – 249
2000-09-15 23:18:13 S 11 57 42.6 -02 19 43 – – 249
2000-09-15 23:18:13 s 2 -0.0098035 3 -0.0030080 2937.0 – 249
2000-09-15 23:42:06 S 11 57 52.0 -02 20 34 – – 249
2000-09-15 23:42:06 s 2 -0.0098034 1 -0.0030102 3085.0 – 249
2000-09-16 00:18:05 S 11 58 02.8 -02 22 47 – – 249
2000-09-16 00:18:05 s 2 -0.0098032 3 -0.0030136 3309.0 – 249
2000-09-16 00:42:05 S 11 58 12.6 -02 24 22 – – 249
2000-09-16 00:42:05 s 2 -0.0098031 1 -0.0030159 3458.0 – 249
2000-09-16 01:42:05 S 11 58 31.8 -02 27 27 – – 249
2000-09-16 01:42:05 s 2 -0.0098028 0 -0.0030215 3830.0 – 249
2000-09-16 02:18:06 S 11 58 43.4 -02 29 14 – – 249
2000-09-16 02:18:06 s 2 -0.0098026 2 -0.0030249 4053.0 – 249
2000-09-16 02:42:06 S 11 58 51.9 -02 30 28 – – 249
2000-09-16 02:42:06 s 2 -0.0098024 9 -0.0030271 4202.0 – 249
2000-09-16 03:20:29 S 11 59 05.9 -02 32 28 – – 249
2000-09-16 03:20:29 s 2 -0.0098022 9 -0.0030307 4440.0 – 249
2000-09-16 04:18:08 S 11 59 24.5 -02 35 19 – – 249
2000-09-16 04:18:08 s 2 -0.0098020 0 -0.0030361 4796.0 – 249
2000-09-16 05:18:14 S 11 59 43.1 -02 38 13 – – 249
2000-09-16 05:18:14 s 2 -0.0098016 8 -0.0030417 5168.0 – 249
2000-09-16 05:42:07 S 11 59 51.6 -02 39 16 – – 249
2000-09-16 05:42:07 s 2 -0.0098015 6 -0.0030439 5316.0 – 249
2000-09-16 06:18:05 S 12 00 03.6 -02 41 05 – – 249
2000-09-16 06:18:05 s 2 -0.0098013 7 -0.0030473 5538.0 – 249
2000-09-16 06:42:05 S 12 00 12.8 -02 42 25 – – 249
2000-09-16 06:42:05 s 2 -0.0098012 4 -0.0030495 5686.0 – 249
2000-09-16 07:42:05 S 12 00 29.9 -02 44 56 – – 249
2000-09-16 07:42:05 s 2 -0.0098009 3 -0.0030551 6056.0 – 249
2000-09-16 08:42:06 S 12 00 51.3 -02 48 05 – – 249
2000-09-16 08:42:06 s 2 -0.0098006 1 -0.0030607 6426.0 – 249
2000-09-16 09:42:06 S 12 01 12.3 -02 51 26 – – 249
2000-09-16 09:42:06 s 2 -0.0098002 9 -0.0030663 6796.0 – 249
2000-10-30 12:11:51 C 16 41 55.17 -28 07 14.5 – – 320
2000-10-30 12:15:25 C 16 41 55.62 -28 07 19.2 – – 320
2001-07-19 07:47:49 C 22 38 59.11 -11 03 13.6 – – 695
2001-07-19 08:48:06 C 22 38 56.91 -11 03 25.2 – – 695
2001-07-19 09:47:42 C 22 38 54.73 -11 03 35.9 – – 695
2001-07-19 10:48:39 C 22 38 52.48 -11 03 47.4 – – 695
2001-07-19 11:23:09 C 22 38 51.26 -11 03 53.5 – – 695
2001-07-24 16:29:00 C 22 34 08.52 -11 28 14.6 – – 360
2001-07-24 16:34:39 C 22 34 08.31 -11 28 15.5 – – 360
2001-08-16 06:50:57 C 22 09 27.23 -13 28 01.9 – c 704
2001-08-16 07:08:45 C 22 09 26.42 -13 28 04.9 – c 704
2001-08-16 07:44:00 C 22 09 24.63 -13 28 13.1 – c 704
2001-08-24 05:46:39 C 22 00 08.63 -14 09 19.8 – – 644
2001-08-24 06:02:47 C 22 00 07.83 -14 09 23.1 – – 644
2001-08-24 06:19:09 C 22 00 07.02 -14 09 26.7 – – 644
2001-08-28 08:47:21 C 21 55 25.29 -14 29 19.6 – – 691
2001-08-28 08:59:38 C 21 55 24.70 -14 29 22.0 – – 691
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)