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
2000-09-15 08:18:05 s 2 -0.0098078 6 -0.0029226 7307.0 – 249
2000-09-15 08:42:06 S 11 52 49.1 -01 36 32 – – 249
2000-09-15 08:42:06 s 2 -0.0098077 5 -0.0029249 7458.0 – 249
2000-09-15 09:18:05 S 11 53 00.8 -01 38 21 – – 249
2000-09-15 09:18:05 s 2 -0.0098075 9 -0.0029284 7684.0 – 249
2000-09-15 09:42:05 S 11 53 09.1 -01 39 37 – – 249
2000-09-15 09:42:05 s 2 -0.0098074 8 -0.0029306 7835.0 – 249
2000-09-15 10:18:08 S 11 53 21.2 -01 41 25 – – 249
2000-09-15 10:18:08 s 2 -0.0098073 1 -0.0029341 8062.0 – 249
2000-09-15 10:42:05 S 11 53 29.2 -01 42 38 – – 249
2000-09-15 10:42:05 s 2 -0.0098072 0 -0.0029364 8212.0 – 249
2000-09-15 11:18:05 S 11 53 41.2 -01 44 20 – – 249
2000-09-15 11:18:05 s 2 -0.0098070 3 -0.0029398 8439.0 – 249
2000-09-15 11:42:05 S 11 53 49.3 -01 45 42 – – 249
2000-09-15 11:42:05 s 2 -0.0098069 2 -0.0029421 8589.0 – 249
2000-09-15 12:18:05 S 11 54 01.8 -01 47 28 – – 249
2000-09-15 12:18:05 s 2 -0.0098067 5 -0.0029455 8815.0 – 249
2000-09-15 12:42:05 S 11 54 08.9 -01 48 32 – – 249
2000-09-15 12:42:05 s 2 -0.0098066 3 -0.0029478 8966.0 – 249
2000-09-15 13:42:05 S 11 54 29.6 -01 51 45 – – 249
2000-09-15 13:42:05 s 2 -0.0098063 5 -0.0029535 9342.0 – 249
2000-09-15 14:18:06 S 11 54 41.2 -01 53 20 – – 249
2000-09-15 14:18:06 s 2 -0.0098061 8 -0.0029569 9568.0 – 249
2000-09-15 14:42:05 S 11 54 49.5 -01 54 29 – – 249
2000-09-15 14:42:05 s 2 -0.0098060 7 -0.0029592 9718.0 – 249
2000-09-15 15:18:06 S 11 55 02.3 -01 56 24 – – 249
2000-09-15 15:18:06 s 2 -0.0098058 9 -0.0029626 9943.0 – 249
2000-09-15 15:42:05 S 11 55 10.7 -01 57 21 – – 249
2000-09-15 15:42:05 s 2 -0.0098057 8 -0.0029649 93.0 – 249
2000-09-15 16:18:07 S 11 55 21.1 -01 59 04 – – 249
2000-09-15 16:18:07 s 2 -0.0098056 0 -0.0029683 318.0 – 249
2000-09-15 16:42:05 S 11 55 30.3 -02 00 19 – – 249
2000-09-15 16:42:05 s 2 -0.0098054 9 -0.0029706 468.0 – 249
2000-09-15 17:18:05 S 11 55 41.7 -02 02 11 – – 249
2000-09-15 17:18:05 s 2 -0.0098053 1 -0.0029740 693.0 – 249
2000-09-15 17:42:05 S 11 55 49.4 -02 03 20 – – 249
2000-09-15 17:42:05 s 2 -0.0098052 0 -0.0029763 843.0 – 249
2000-09-15 18:18:06 S 11 56 01.8 -02 05 25 – – 249
2000-09-15 18:18:06 s 2 -0.0098050 2 -0.0029797 1068.0 – 249
2000-09-15 18:42:05 S 11 56 08.9 -02 06 15 – – 249
2000-09-15 18:42:05 s 2 -0.0098049 0 -0.0029819 1218.0 – 249
2000-09-15 19:42:05 S 11 56 29.4 -02 08 30 – – 249
2000-09-15 19:42:05 s 2 -0.0098046 1 -0.0029876 1592.0 – 249
2000-09-15 20:42:06 S 11 56 51.5 -02 12 05 – – 249
2000-09-15 20:42:06 s 2 -0.0098043 1 -0.0029933 1966.0 – 249
2000-09-15 21:18:05 S 11 57 03.3 -02 13 29 – – 249
2000-09-15 21:18:05 s 2 -0.0098041 3 -0.0029967 2190.0 – 249
2000-09-15 21:42:05 S 11 57 11.1 -02 15 41 – – 249
2000-09-15 21:42:05 s 2 -0.0098040 1 -0.0029989 2339.0 – 249
2000-09-15 22:18:05 S 11 57 24.2 -02 17 03 – – 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)