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
2000-09-13 10:42:18 s 2 -0.0098181 8 -0.0026536 9718.0 – 249
2000-09-13 11:18:05 S 11 37 28.0 +00 41 17 – – 249
2000-09-13 11:18:05 s 2 -0.0098180 7 -0.0026572 9953.0 – 249
2000-09-13 11:42:05 S 11 37 37.3 +00 40 13 – – 249
2000-09-13 11:42:05 s 2 -0.0098180 0 -0.0026596 110.0 – 249
2000-09-13 12:18:05 S 11 37 49.6 +00 37 55 – – 249
2000-09-13 12:18:05 s 2 -0.0098179 0 -0.0026633 346.0 – 249
2000-09-13 12:42:05 S 11 37 56.1 +00 37 03 – – 249
2000-09-13 12:42:05 s 2 -0.0098178 3 -0.0026657 504.0 – 249
2000-09-13 13:42:19 S 11 38 16.2 +00 33 26 – – 249
2000-09-13 13:42:19 s 2 -0.0098176 5 -0.0026718 898.0 – 249
2000-09-13 14:18:05 S 11 38 29.5 +00 31 59 – – 249
2000-09-13 14:18:05 s 2 -0.0098175 4 -0.0026754 1132.0 – 249
2000-09-13 14:42:06 S 11 38 37.5 +00 30 32 – – 249
2000-09-13 14:42:06 s 2 -0.0098174 7 -0.0026778 1289.0 – 249
2000-09-13 15:18:06 S 11 38 50.6 +00 28 55 – – 249
2000-09-13 15:18:06 s 2 -0.0098173 6 -0.0026814 1525.0 – 249
2000-09-13 15:42:05 S 11 38 56.7 +00 27 47 – – 249
2000-09-13 15:42:05 s 2 -0.0098172 8 -0.0026838 1682.0 – 249
2000-09-13 16:18:05 S 11 39 09.4 +00 25 59 – – 249
2000-09-13 16:18:05 s 2 -0.0098171 7 -0.0026874 1917.0 – 249
2000-09-13 16:42:06 S 11 39 18.0 +00 24 40 – – 249
2000-09-13 16:42:06 s 2 -0.0098171 0 -0.0026898 2074.0 – 249
2000-09-13 17:18:05 S 11 39 30.5 +00 22 43 – – 249
2000-09-13 17:18:05 s 2 -0.0098169 8 -0.0026934 2308.0 – 249
2000-09-13 17:42:05 S 11 39 38.2 +00 21 24 – – 249
2000-09-13 17:42:05 s 2 -0.0098169 1 -0.0026959 2465.0 – 249
2000-09-13 18:18:06 S 11 39 51.1 +00 19 45 – – 249
2000-09-13 18:18:06 s 2 -0.0098167 9 -0.0026995 2700.0 – 249
2000-09-13 18:42:05 S 11 39 58.6 +00 18 28 – – 249
2000-09-13 18:42:05 s 2 -0.0098167 2 -0.0027019 2856.0 – 249
2000-09-13 19:42:18 S 11 40 19.3 +00 15 17 – – 249
2000-09-13 19:42:18 s 2 -0.0098165 2 -0.0027079 3248.0 – 249
2000-09-13 20:18:05 S 11 40 31.7 +00 13 28 – – 249
2000-09-13 20:18:05 s 2 -0.0098164 0 -0.0027115 3481.0 – 249
2000-09-13 20:42:05 S 11 40 40.4 +00 12 19 – – 249
2000-09-13 20:42:05 s 2 -0.0098163 2 -0.0027139 3637.0 – 249
2000-09-13 21:18:06 S 11 40 53.2 +00 10 04 – – 249
2000-09-13 21:18:06 s 2 -0.0098162 1 -0.0027175 3872.0 – 249
2000-09-13 21:42:05 S 11 40 59.2 +00 09 20 – – 249
2000-09-13 21:42:05 s 2 -0.0098161 3 -0.0027199 4027.0 – 249
2000-09-13 22:18:05 S 11 41 11.6 +00 07 21 – – 249
2000-09-13 22:18:05 s 2 -0.0098160 0 -0.0027234 4261.0 – 249
2000-09-13 23:18:14 S 11 41 33.3 +00 04 09 – – 249
2000-09-13 23:18:14 s 2 -0.0098158 0 -0.0027294 4652.0 – 249
2000-09-13 23:42:05 S 11 41 42.3 +00 03 00 – – 249
2000-09-13 23:42:05 s 2 -0.0098157 2 -0.0027318 4807.0 – 249
2000-09-14 00:18:05 S 11 41 53.1 +00 01 31 – – 249
2000-09-14 00:18:05 s 2 -0.0098156 0 -0.0027354 5040.0 – 249
2000-09-14 00:42:05 S 11 42 01.2 +00 00 18 – – 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)