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
2000-09-11 18:36:05 s 2 -0.0098226 9 -0.0024037 3622.0 – 249
2000-09-12 17:42:05 S 11 31 26.4 +01 35 50 – – 249
2000-09-12 17:42:05 s 2 -0.0098206 5 -0.0025492 2968.0 – 249
2000-09-12 19:42:19 S 11 32 06.9 +01 28 42 – – 249
2000-09-12 19:42:19 s 2 -0.0098204 0 -0.0025617 3769.0 – 249
2000-09-12 20:18:05 S 11 32 20.1 +01 26 57 – – 249
2000-09-12 20:18:05 s 2 -0.0098203 2 -0.0025654 4007.0 – 249
2000-09-12 20:42:05 S 11 32 27.3 +01 26 08 – – 249
2000-09-12 20:42:05 s 2 -0.0098202 7 -0.0025678 4166.0 – 249
2000-09-12 21:18:06 S 11 32 40.5 +01 24 30 – – 249
2000-09-12 21:18:06 s 2 -0.0098201 8 -0.0025715 4406.0 – 249
2000-09-12 21:42:06 S 11 32 50.0 +01 23 15 – – 249
2000-09-12 21:42:06 s 2 -0.0098201 3 -0.0025740 4565.0 – 249
2000-09-12 22:18:05 S 11 33 01.3 +01 21 07 – – 249
2000-09-12 22:18:05 s 2 -0.0098200 5 -0.0025777 4805.0 – 249
2000-09-12 23:42:05 S 11 33 31.9 +01 16 37 – – 249
2000-09-12 23:42:05 s 2 -0.0098198 5 -0.0025863 5362.0 – 249
2000-09-13 00:18:05 S 11 33 44.0 +01 15 10 – – 249
2000-09-13 00:18:05 s 2 -0.0098198 3 -0.0025900 5600.0 – 249
2000-09-13 01:42:29 S 11 34 12.0 +01 10 27 – – 249
2000-09-13 01:42:29 s 2 -0.0098196 2 -0.0025986 6159.0 – 249
2000-09-13 02:18:05 S 11 34 22.0 +01 08 59 – – 249
2000-09-13 02:18:05 s 2 -0.0098195 3 -0.0026023 6395.0 – 249
2000-09-13 02:42:05 S 11 34 33.5 +01 07 20 – – 249
2000-09-13 02:42:05 s 2 -0.0098194 7 -0.0026047 6553.0 – 249
2000-09-13 03:18:05 S 11 34 43.8 +01 06 05 – – 249
2000-09-13 03:18:05 s 2 -0.0098193 8 -0.0026084 6792.0 – 249
2000-09-13 03:42:05 S 11 34 54.1 +01 04 27 – – 249
2000-09-13 03:42:05 s 2 -0.0098193 2 -0.0026109 6950.0 – 249
2000-09-13 04:18:05 S 11 35 04.5 +01 02 36 – – 249
2000-09-13 04:18:05 s 2 -0.0098192 3 -0.0026145 7188.0 – 249
2000-09-13 05:18:06 S 11 35 24.5 +00 59 46 – – 249
2000-09-13 05:18:06 s 2 -0.0098190 7 -0.0026207 7584.0 – 249
2000-09-13 05:42:06 S 11 35 33.1 +00 58 41 – – 249
2000-09-13 05:42:06 s 2 -0.0098190 1 -0.0026231 7742.0 – 249
2000-09-13 06:18:05 S 11 35 45.6 +00 56 49 – – 249
2000-09-13 06:18:05 s 2 -0.0098189 1 -0.0026268 7980.0 – 249
2000-09-13 06:42:05 S 11 35 55.6 +00 55 14 – – 249
2000-09-13 06:42:05 s 2 -0.0098188 5 -0.0026292 8138.0 – 249
2000-09-13 07:42:18 S 11 36 13.8 +00 52 33 – – 249
2000-09-13 07:42:18 s 2 -0.0098186 8 -0.0026353 8535.0 – 249
2000-09-13 08:18:05 S 11 36 27.1 +00 50 12 – – 249
2000-09-13 08:18:05 s 2 -0.0098185 9 -0.0026390 8770.0 – 249
2000-09-13 08:42:05 S 11 36 34.5 +00 49 10 – – 249
2000-09-13 08:42:05 s 2 -0.0098185 2 -0.0026414 8928.0 – 249
2000-09-13 09:42:05 S 11 36 53.7 +00 45 27 – – 249
2000-09-13 09:42:05 s 2 -0.0098183 5 -0.0026475 9322.0 – 249
2000-09-13 10:20:17 S 11 37 09.6 +00 43 51 – – 249
2000-09-13 10:20:17 s 2 -0.0098182 4 -0.0026513 9573.0 – 249
2000-09-13 10:42:18 S 11 37 15.2 +00 43 04 – – 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)