IAA RAS IAA SBSS Data Base

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
2000-09-09 15:14:18 s 2 -0.0098198 1 -0.0020637 2112.0 – 249
2000-09-09 15:21:48 S 11 05 43.4 +05 27 16 – – 249
2000-09-09 15:21:48 s 2 -0.0098198 3 -0.0020645 2166.0 – 249
2000-09-09 15:36:03 S 11 05 48.3 +05 26 36 – – 249
2000-09-09 15:36:03 s 2 -0.0098198 7 -0.0020661 2268.0 – 249
2000-09-09 15:50:20 S 11 05 53.6 +05 25 56 – – 249
2000-09-09 15:50:20 s 2 -0.0098199 1 -0.0020678 2370.0 – 249
2000-09-09 16:04:35 S 11 05 59.5 +05 25 05 – – 249
2000-09-09 16:04:35 s 2 -0.0098199 5 -0.0020694 2471.0 – 249
2000-09-09 16:18:50 S 11 06 03.7 +05 24 16 – – 249
2000-09-09 16:18:50 s 2 -0.0098199 9 -0.0020710 2573.0 – 249
2000-09-09 16:26:19 S 11 06 06.1 +05 23 52 – – 249
2000-09-09 16:26:19 s 2 -0.0098200 1 -0.0020719 2627.0 – 249
2000-09-09 16:33:54 S 11 06 09.0 +05 23 33 – – 249
2000-09-09 16:33:54 s 2 -0.0098200 3 -0.0020727 2681.0 – 249
2000-09-09 16:48:07 S 11 06 14.1 +05 22 42 – – 249
2000-09-09 16:48:07 s 2 -0.0098200 7 -0.0020744 2782.0 – 249
2000-09-09 17:02:24 S 11 06 18.6 +05 22 11 – – 249
2000-09-09 17:02:24 s 2 -0.0098201 1 -0.0020760 2884.0 – 249
2000-09-09 17:16:37 S 11 06 24.0 +05 21 17 – – 249
2000-09-09 17:16:37 s 2 -0.0098201 5 -0.0020776 2985.0 – 249
2000-09-09 17:30:52 S 11 06 28.5 +05 20 34 – – 249
2000-09-09 17:30:52 s 2 -0.0098201 9 -0.0020792 3087.0 – 249
2000-09-09 17:38:20 S 11 06 31.3 +05 20 12 – – 249
2000-09-09 17:38:20 s 2 -0.0098202 1 -0.0020801 3140.0 – 249
2000-09-09 18:00:08 S 11 06 39.0 +05 19 02 – – 249
2000-09-09 18:00:08 s 2 -0.0098202 7 -0.0020826 3296.0 – 249
2000-09-09 18:14:20 S 11 06 43.5 +05 18 15 – – 249
2000-09-09 18:14:20 s 2 -0.0098203 1 -0.0020842 3397.0 – 249
2000-09-09 18:28:35 S 11 06 48.6 +05 17 32 – – 249
2000-09-09 18:28:35 s 2 -0.0098203 4 -0.0020858 3498.0 – 249
2000-09-09 18:42:53 S 11 06 55.0 +05 17 09 – – 249
2000-09-09 18:42:53 s 2 -0.0098203 8 -0.0020874 3600.0 – 249
2000-09-09 18:50:22 S 11 06 56.6 +05 16 24 – – 249
2000-09-09 18:50:22 s 2 -0.0098204 0 -0.0020883 3653.0 – 249
2000-09-09 18:57:51 S 11 06 58.7 +05 16 01 – – 249
2000-09-09 18:57:51 s 2 -0.0098204 2 -0.0020891 3707.0 – 249
2000-09-09 19:12:06 S 11 07 03.9 +05 15 15 – – 249
2000-09-09 19:12:06 s 2 -0.0098204 6 -0.0020907 3808.0 – 249
2000-09-09 19:26:22 S 11 07 08.6 +05 14 28 – – 249
2000-09-09 19:26:22 s 2 -0.0098204 9 -0.0020924 3910.0 – 249
2000-09-09 19:40:36 S 11 07 13.4 +05 13 50 – – 249
2000-09-09 19:40:36 s 2 -0.0098205 3 -0.0020940 4011.0 – 249
2000-09-09 19:54:55 S 11 07 19.2 +05 13 03 – – 249
2000-09-09 19:54:55 s 2 -0.0098205 7 -0.0020956 4113.0 – 249
2000-09-09 20:09:55 S 11 07 23.9 +05 12 18 – – 249
2000-09-09 20:09:55 s 2 -0.0098206 0 -0.0020973 4219.0 – 249
2000-09-09 20:24:10 S 11 07 28.6 +05 11 18 – – 249
2000-09-09 20:24:10 s 2 -0.0098206 4 -0.0020989 4321.0 – 249
2000-09-09 20:38:25 S 11 07 33.9 +05 10 48 – – 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)