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
2000-09-06 10:42:05 s 2 -0.0097887 3 -0.0015126 8219.0 – 249
2000-09-06 11:18:06 S 10 39 06.2 +09 21 33 – – 249
2000-09-06 11:18:06 s 2 -0.0097891 3 -0.0015171 8493.0 – 249
2000-09-06 11:42:32 S 10 39 16.2 +09 20 31 – – 249
2000-09-06 11:42:32 s 2 -0.0097894 0 -0.0015202 8679.0 – 249
2000-09-06 12:18:05 S 10 39 30.4 +09 18 11 – – 249
2000-09-06 12:18:05 s 2 -0.0097898 0 -0.0015247 8949.0 – 249
2000-09-06 12:42:05 S 10 39 36.3 +09 17 28 – – 249
2000-09-06 12:42:05 s 2 -0.0097900 6 -0.0015277 9131.0 – 249
2000-09-06 13:42:05 S 10 39 57.3 +09 14 22 – – 249
2000-09-06 13:42:05 s 2 -0.0097907 1 -0.0015352 9587.0 – 249
2000-09-06 14:18:05 S 10 40 10.9 +09 12 27 – – 249
2000-09-06 14:18:05 s 2 -0.0097911 0 -0.0015397 9860.0 – 249
2000-09-06 15:18:05 S 10 40 32.0 +09 09 48 – – 249
2000-09-06 15:18:05 s 2 -0.0097917 4 -0.0015472 315.0 – 249
2000-09-06 15:42:05 S 10 40 39.1 +09 07 50 – – 249
2000-09-06 15:42:05 s 2 -0.0097919 9 -0.0015503 497.0 – 249
2000-09-06 16:18:05 S 10 40 53.5 +09 06 20 – – 249
2000-09-06 16:18:05 s 2 -0.0097923 7 -0.0015548 770.0 – 249
2000-09-06 16:42:06 S 10 41 01.0 +09 05 21 – – 249
2000-09-06 16:42:06 s 2 -0.0097926 2 -0.0015578 952.0 – 249
2000-09-06 17:18:05 S 10 41 15.6 +09 03 41 – – 249
2000-09-06 17:18:05 s 2 -0.0097929 9 -0.0015622 1225.0 – 249
2000-09-06 17:42:06 S 10 41 20.3 +09 02 50 – – 249
2000-09-06 17:42:06 s 2 -0.0097932 4 -0.0015652 1406.0 – 249
2000-09-06 18:18:05 S 10 41 32.6 +09 00 20 – – 249
2000-09-06 18:18:05 s 2 -0.0097936 1 -0.0015697 1679.0 – 249
2000-09-06 20:42:05 S 10 42 25.8 +08 53 21 – – 249
2000-09-06 20:42:05 s 2 -0.0097950 6 -0.0015877 2767.0 – 249
2000-09-06 21:18:05 S 10 42 37.1 +08 51 15 – – 249
2000-09-06 21:18:05 s 2 -0.0097954 2 -0.0015921 3039.0 – 249
2000-09-06 22:18:07 S 10 42 59.1 +08 48 06 – – 249
2000-09-06 22:18:07 s 2 -0.0097960 0 -0.0015996 3492.0 – 249
2000-09-06 23:18:41 S 10 43 20.4 +08 45 34 – – 249
2000-09-06 23:18:41 s 2 -0.0097965 9 -0.0016071 3949.0 – 249
2000-09-06 23:42:05 S 10 43 32.2 +08 43 09 – – 249
2000-09-06 23:42:05 s 2 -0.0097968 1 -0.0016100 4125.0 – 249
2000-09-07 00:18:06 S 10 43 40.7 +08 42 24 – – 249
2000-09-07 00:18:06 s 2 -0.0097971 5 -0.0016144 4396.0 – 249
2000-09-07 00:42:05 S 10 43 53.0 +08 41 06 – – 249
2000-09-07 00:42:05 s 2 -0.0097973 8 -0.0016174 4577.0 – 249
2000-09-07 01:42:05 S 10 44 09.8 +08 38 01 – – 249
2000-09-07 01:42:05 s 2 -0.0097979 4 -0.0016248 5029.0 – 249
2000-09-07 03:18:05 S 10 44 42.8 +08 33 33 – – 249
2000-09-07 03:18:05 s 2 -0.0097988 2 -0.0016367 5750.0 – 249
2000-09-07 03:42:05 S 10 44 53.8 +08 31 43 – – 249
2000-09-07 03:42:05 s 2 -0.0097990 4 -0.0016396 5930.0 – 249
2000-09-07 04:42:05 S 10 45 14.4 +08 28 19 – – 249
2000-09-07 04:42:05 s 2 -0.0097995 8 -0.0016470 6381.0 – 249
2000-09-07 05:18:05 S 10 45 26.1 +08 26 54 – – 249
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)