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
2000-09-14 15:42:05 s 2 -0.0098121 5 -0.0028264 988.0 – 249
2000-09-14 16:18:05 S 11 47 18.1 -00 47 04 – – 249
2000-09-14 16:18:05 s 2 -0.0098120 0 -0.0028299 1218.0 – 249
2000-09-14 18:18:05 S 11 47 58.5 -00 53 05 – – 249
2000-09-14 18:18:05 s 2 -0.0098115 1 -0.0028416 1984.0 – 249
2000-09-14 18:42:05 S 11 48 06.5 -00 54 24 – – 249
2000-09-14 18:42:05 s 2 -0.0098114 1 -0.0028439 2137.0 – 249
2000-09-14 19:42:06 S 11 48 26.6 -00 57 19 – – 249
2000-09-14 19:42:06 s 2 -0.0098111 6 -0.0028498 2519.0 – 249
2000-09-14 20:18:05 S 11 48 38.5 -00 59 17 – – 249
2000-09-14 20:18:05 s 2 -0.0098110 1 -0.0028533 2748.0 – 249
2000-09-14 20:42:05 S 11 48 47.1 -01 00 32 – – 249
2000-09-14 20:42:05 s 2 -0.0098109 1 -0.0028556 2901.0 – 249
2000-09-14 21:18:06 S 11 48 58.9 -01 02 06 – – 249
2000-09-14 21:18:06 s 2 -0.0098107 6 -0.0028591 3130.0 – 249
2000-09-14 21:42:07 S 11 49 07.2 -01 03 33 – – 249
2000-09-14 21:42:07 s 2 -0.0098106 6 -0.0028614 3283.0 – 249
2000-09-14 22:18:07 S 11 49 18.8 -01 05 07 – – 249
2000-09-14 22:18:07 s 2 -0.0098105 1 -0.0028649 3512.0 – 249
2000-09-14 23:18:12 S 11 49 38.8 -01 08 19 – – 249
2000-09-14 23:18:12 s 2 -0.0098102 5 -0.0028707 3893.0 – 249
2000-09-14 23:42:05 S 11 49 48.4 -01 09 29 – – 249
2000-09-14 23:42:05 s 2 -0.0098101 5 -0.0028730 4045.0 – 249
2000-09-15 00:18:05 S 11 49 59.2 -01 11 23 – – 249
2000-09-15 00:18:05 s 2 -0.0098100 0 -0.0028765 4273.0 – 249
2000-09-15 00:42:06 S 11 50 07.2 -01 12 35 – – 249
2000-09-15 00:42:06 s 2 -0.0098098 9 -0.0028788 4426.0 – 249
2000-09-15 01:42:05 S 11 50 27.2 -01 15 34 – – 249
2000-09-15 01:42:05 s 2 -0.0098096 3 -0.0028846 4806.0 – 249
2000-09-15 02:18:06 S 11 50 39.9 -01 17 26 – – 249
2000-09-15 02:18:06 s 2 -0.0098094 7 -0.0028881 5034.0 – 249
2000-09-15 02:42:06 S 11 50 47.7 -01 19 02 – – 249
2000-09-15 02:42:06 s 2 -0.0098093 7 -0.0028904 5186.0 – 249
2000-09-15 03:18:05 S 11 51 00.2 -01 20 22 – – 249
2000-09-15 03:18:05 s 2 -0.0098092 1 -0.0028938 5413.0 – 249
2000-09-15 04:18:05 S 11 51 20.0 -01 23 24 – – 249
2000-09-15 04:18:05 s 2 -0.0098089 4 -0.0028996 5793.0 – 249
2000-09-15 04:42:05 S 11 51 27.7 -01 24 33 – – 249
2000-09-15 04:42:05 s 2 -0.0098088 4 -0.0029019 5944.0 – 249
2000-09-15 05:18:05 S 11 51 40.2 -01 26 24 – – 249
2000-09-15 05:18:05 s 2 -0.0098086 8 -0.0029054 6172.0 – 249
2000-09-15 05:42:05 S 11 51 48.6 -01 27 38 – – 249
2000-09-15 05:42:05 s 2 -0.0098085 7 -0.0029077 6323.0 – 249
2000-09-15 06:18:05 S 11 52 00.3 -01 29 22 – – 249
2000-09-15 06:18:05 s 2 -0.0098084 1 -0.0029111 6550.0 – 249
2000-09-15 06:42:05 S 11 52 08.1 -01 30 37 – – 249
2000-09-15 06:42:05 s 2 -0.0098083 0 -0.0029134 6702.0 – 249
2000-09-15 07:42:05 S 11 52 28.7 -01 33 29 – – 249
2000-09-15 07:42:05 s 2 -0.0098080 3 -0.0029192 7080.0 – 249
2000-09-15 08:18:05 S 11 52 41.1 -01 35 23 – – 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)