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
2000-09-05 08:18:05 s 2 -0.0097681 5 -0.0013102 6049.0 – 249
2000-09-05 08:42:06 S 10 29 47.7 +10 41 05 – – 249
2000-09-05 08:42:06 s 2 -0.0097685 1 -0.0013133 6235.0 – 249
2000-09-05 09:18:06 S 10 30 03.6 +10 39 45 – – 249
2000-09-05 09:18:06 s 2 -0.0097690 4 -0.0013180 6514.0 – 249
2000-09-05 09:42:06 S 10 30 11.6 +10 37 44 – – 249
2000-09-05 09:42:06 s 2 -0.0097693 9 -0.0013211 6700.0 – 249
2000-09-05 10:20:06 S 10 30 22.1 +10 36 23 – – 249
2000-09-05 10:20:06 s 2 -0.0097699 5 -0.0013260 6995.0 – 249
2000-09-05 10:42:25 S 10 30 30.8 +10 34 56 – – 249
2000-09-05 10:42:25 s 2 -0.0097702 7 -0.0013289 7168.0 – 249
2000-09-05 11:18:05 S 10 30 43.0 +10 33 23 – – 249
2000-09-05 11:18:05 s 2 -0.0097707 9 -0.0013335 7444.0 – 249
2000-09-05 11:42:06 S 10 30 53.4 +10 32 23 – – 249
2000-09-05 11:42:06 s 2 -0.0097711 3 -0.0013366 7629.0 – 249
2000-09-05 12:18:05 S 10 31 04.4 +10 30 20 – – 249
2000-09-05 12:18:05 s 2 -0.0097716 5 -0.0013413 7908.0 – 249
2000-09-05 13:42:05 S 10 31 36.9 +10 26 33 – – 249
2000-09-05 13:42:05 s 2 -0.0097728 4 -0.0013521 8557.0 – 249
2000-09-05 14:18:05 S 10 31 45.9 +10 24 30 – – 249
2000-09-05 14:18:05 s 2 -0.0097733 4 -0.0013568 8835.0 – 249
2000-09-05 21:42:05 S 10 34 25.0 +10 02 13 – – 249
2000-09-05 21:42:05 s 2 -0.0097793 2 -0.0014137 2255.0 – 249
2000-09-05 22:18:05 S 10 34 36.1 +10 00 31 – – 249
2000-09-05 22:18:05 s 2 -0.0097797 9 -0.0014183 2532.0 – 249
2000-09-05 23:18:13 S 10 34 57.2 +09 57 34 – – 249
2000-09-05 23:18:13 s 2 -0.0097805 6 -0.0014260 2993.0 – 249
2000-09-05 23:42:06 S 10 35 06.7 +09 56 21 – – 249
2000-09-05 23:42:06 s 2 -0.0097808 6 -0.0014290 3176.0 – 249
2000-09-06 00:18:05 S 10 35 17.1 +09 54 36 – – 249
2000-09-06 00:18:05 s 2 -0.0097813 2 -0.0014336 3452.0 – 249
2000-09-06 00:42:05 S 10 35 25.5 +09 53 25 – – 249
2000-09-06 00:42:05 s 2 -0.0097816 2 -0.0014367 3636.0 – 249
2000-09-06 05:42:05 S 10 37 12.5 +09 38 18 – – 249
2000-09-06 05:42:05 s 2 -0.0097852 7 -0.0014748 5932.0 – 249
2000-09-06 06:18:06 S 10 37 24.7 +09 36 43 – – 249
2000-09-06 06:18:06 s 2 -0.0097857 0 -0.0014793 6207.0 – 249
2000-09-06 06:42:06 S 10 37 32.7 +09 35 11 – – 249
2000-09-06 06:42:06 s 2 -0.0097859 8 -0.0014824 6390.0 – 249
2000-09-06 08:18:05 S 10 38 05.5 +09 31 05 – – 249
2000-09-06 08:18:05 s 2 -0.0097871 0 -0.0014945 7122.0 – 249
2000-09-06 08:42:05 S 10 38 11.9 +09 29 19 – – 249
2000-09-06 08:42:05 s 2 -0.0097873 7 -0.0014975 7305.0 – 249
2000-09-06 09:18:05 S 10 38 26.8 +09 27 32 – – 249
2000-09-06 09:18:05 s 2 -0.0097877 8 -0.0015020 7579.0 – 249
2000-09-06 09:42:05 S 10 38 35.4 +09 26 38 – – 249
2000-09-06 09:42:05 s 2 -0.0097880 6 -0.0015051 7762.0 – 249
2000-09-06 10:20:04 S 10 38 48.2 +09 24 25 – – 249
2000-09-06 10:20:04 s 2 -0.0097884 8 -0.0015098 8051.0 – 249
2000-09-06 10:42:05 S 10 38 56.0 +09 23 19 – – 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)