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
2000-09-07 05:18:05 s 2 -0.0097999 0 -0.0016515 6651.0 – 249
2000-09-07 08:18:05 S 10 46 29.0 +08 18 08 – – 249
2000-09-07 08:18:05 s 2 -0.0098014 7 -0.0016736 8000.0 – 249
2000-09-07 08:42:06 S 10 46 39.8 +08 16 33 – – 249
2000-09-07 08:42:06 s 2 -0.0098016 7 -0.0016765 8179.0 – 249
2000-09-07 09:18:06 S 10 46 51.5 +08 14 15 – – 249
2000-09-07 09:18:06 s 2 -0.0098019 7 -0.0016809 8449.0 – 249
2000-09-07 09:42:05 S 10 46 58.4 +08 13 26 – – 249
2000-09-07 09:42:05 s 2 -0.0098021 7 -0.0016838 8628.0 – 249
2000-09-07 10:20:05 S 10 47 09.3 +08 11 23 – – 249
2000-09-07 10:20:05 s 2 -0.0098024 9 -0.0016885 8912.0 – 249
2000-09-07 11:18:05 S 10 47 32.1 +08 09 10 – – 249
2000-09-07 11:18:05 s 2 -0.0098029 6 -0.0016956 9345.0 – 249
2000-09-07 11:42:05 S 10 47 40.9 +08 07 29 – – 249
2000-09-07 11:42:05 s 2 -0.0098031 6 -0.0016985 9524.0 – 249
2000-09-07 12:18:06 S 10 47 53.1 +08 06 06 – – 249
2000-09-07 12:18:06 s 2 -0.0098034 5 -0.0017029 9793.0 – 249
2000-09-07 13:42:14 S 10 48 22.7 +08 01 17 – – 249
2000-09-07 13:42:14 s 2 -0.0098041 2 -0.0017131 420.0 – 249
2000-09-07 14:18:05 S 10 48 36.4 +07 59 18 – – 249
2000-09-07 14:18:05 s 2 -0.0098044 0 -0.0017175 687.0 – 249
2000-09-07 14:42:05 S 10 48 41.2 +07 58 02 – – 249
2000-09-07 14:42:05 s 2 -0.0098045 9 -0.0017204 866.0 – 249
2000-09-07 16:42:05 S 10 49 24.2 +07 52 06 – – 249
2000-09-07 16:42:05 s 2 -0.0098055 1 -0.0017350 1759.0 – 249
2000-09-07 17:42:06 S 10 49 46.1 +07 49 06 – – 249
2000-09-07 17:42:06 s 2 -0.0098059 5 -0.0017423 2204.0 – 249
2000-09-07 18:18:06 S 10 49 59.4 +07 47 03 – – 249
2000-09-07 18:18:06 s 2 -0.0098062 2 -0.0017466 2472.0 – 249
2000-09-07 19:42:06 S 10 50 30.8 +07 42 45 – – 249
2000-09-07 19:42:06 s 2 -0.0098068 3 -0.0017568 3095.0 – 249
2000-09-07 20:18:05 S 10 50 41.2 +07 40 55 – – 249
2000-09-07 20:18:05 s 2 -0.0098070 9 -0.0017611 3362.0 – 249
2000-09-07 20:42:05 S 10 50 48.3 +07 39 39 – – 249
2000-09-07 20:42:05 s 2 -0.0098072 6 -0.0017640 3540.0 – 249
2000-09-07 21:18:05 S 10 51 01.9 +07 38 02 – – 249
2000-09-07 21:18:05 s 2 -0.0098075 1 -0.0017684 3806.0 – 249
2000-09-07 21:42:05 S 10 51 08.9 +07 36 45 – – 249
2000-09-07 21:42:05 s 2 -0.0098076 8 -0.0017713 3984.0 – 249
2000-09-07 22:18:05 S 10 51 22.4 +07 34 49 – – 249
2000-09-07 22:18:05 s 2 -0.0098079 3 -0.0017756 4250.0 – 249
2000-09-07 23:18:14 S 10 51 42.9 +07 32 10 – – 249
2000-09-07 23:18:14 s 2 -0.0098083 5 -0.0017828 4695.0 – 249
2000-09-07 23:42:05 S 10 51 52.3 +07 30 36 – – 249
2000-09-07 23:42:05 s 2 -0.0098085 1 -0.0017857 4871.0 – 249
2000-09-09 14:52:33 S 11 05 34.3 +05 29 03 – – 249
2000-09-09 14:52:33 s 2 -0.0098197 4 -0.0020612 1957.0 – 249
2000-09-09 15:06:51 S 11 05 38.5 +05 27 48 – – 249
2000-09-09 15:06:51 s 2 -0.0098197 8 -0.0020628 2059.0 – 249
2000-09-09 15:14:18 S 11 05 40.6 +05 27 33 – – 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)