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
2023-08-20 02:54:37 B 05 05 20.98 +32 44 20.1 – Z C95
2023-08-20 02:54:54 C 05 05 21.026 +32 44 19.50 – V 970
2023-08-20 02:58:42 B 05 05 21.83 +32 44 22.4 – Z C95
2023-08-20 03:01:27 C 05 05 22.38 +32 44 23.6 – v A77
2023-08-20 03:04:16 B 05 05 22.94 +32 44 24.4 – Z C95
2023-08-20 03:10:49 C 05 05 24.290 +32 44 26.34 – V 970
2023-08-20 03:11:09 C 05 05 24.34 +32 44 28.0 – q L27
2023-08-20 03:13:41 C 05 05 24.85 +32 44 28.8 – v A77
2023-08-20 03:14:02 B 05 05 24.97 +32 44 28.9 – Z C95
2023-08-20 03:22:08 B 05 05 26.55 +32 44 32.7 – Z C95
2023-08-20 03:27:06 C 05 05 27.58 +32 44 34.9 – v A77
2023-08-20 03:27:32 B 05 05 27.72 +32 44 35.1 – Z C95
2023-08-20 03:38:15 C 05 05 29.83 +32 44 40.4 – q L27
2023-08-21 01:16:01 B 05 09 56.82 +32 54 05.1 – Z C95
2023-08-21 01:22:03 B 05 09 58.102 +32 54 07.63 – Z C95
2023-08-21 01:22:27 C 05 09 58.13 +32 54 07.9 – X G02
2023-08-21 01:27:07 B 05 09 59.15 +32 54 10.0 – Z C95
2023-08-21 01:32:00 C 05 10 00.10 +32 54 12.1 – X G02
2023-08-21 01:38:13 B 05 10 01.48 +32 54 14.8 – Z C95
2023-08-21 01:41:32 C 05 10 02.08 +32 54 16.2 – X G02
2023-08-21 01:42:42 C 05 10 02.37 +32 54 18.0 – Z G23
2023-08-21 01:49:08 B 05 10 03.734 +32 54 19.51 – Z C95
2023-08-21 01:51:29 B 05 10 04.21 +32 54 20.5 – Z C95
2023-08-21 01:57:03 C 05 10 05.53 +32 54 23.1 – Z G23
2023-08-21 02:09:04 B 05 10 07.88 +32 54 28.4 – Z C95
2023-08-21 02:18:17 B 05 10 09.804 +32 54 32.33 – Z C95
2023-08-21 02:22:45 B 05 10 10.76 +32 54 34.4 – Z C95
2023-08-21 02:43:08 B 05 10 14.962 +32 54 43.16 – Z C95
2023-08-21 03:05:23 B 05 10 19.582 +32 54 52.92 – Z C95
2023-08-21 03:27:37 B 05 10 24.204 +32 55 02.60 – Z C95
2023-08-23 00:56:19 C 05 20 07.79 +33 13 29.8 – V C23
2023-08-23 00:59:00 C 05 20 08.36 +33 13 31.6 – V C23
2023-08-23 03:45:56 C 05 20 45.041 +33 14 38.15 – V Z28
2023-08-23 03:49:30 C 05 20 45.842 +33 14 39.52 – V Z28
2023-08-24 02:45:57 C 05 25 52.31 +33 23 09.0 – q 215
2023-08-24 02:48:44 C 05 25 52.92 +33 23 10.0 – q 215
2023-08-24 02:51:31 C 05 25 53.54 +33 23 10.9 – q 215
2023-08-24 11:29:04 C 05 27 50.80 +33 26 14.9 – V U94
2023-08-24 11:31:50 C 05 27 51.44 +33 26 15.5 – V U94
2023-08-24 17:56:36 C 05 29 19.40 +33 28 29.4 – m 349
2023-08-24 18:07:07 C 05 29 21.82 +33 28 33.0 – m 349
2023-08-24 19:06:12 C 05 29 35.32 +33 28 53.0 – u 367
2023-08-24 19:09:42 C 05 29 36.12 +33 28 54.0 – u 367
2023-08-25 01:14:36 C 05 31 00.30 +33 30 52.7 – Z G23
2023-08-25 01:28:57 C 05 31 03.62 +33 31 01.3 – Z G23
2023-08-25 03:07:55 C 05 31 26.36 +33 31 33.2 – v A77
2023-08-25 03:14:55 C 05 31 27.97 +33 31 35.9 – v A77
2023-08-25 03:23:04 C 05 31 29.86 +33 31 38.4 – v A77
2023-08-25 10:01:49 C 05 33 02.73 +33 33 49.3 – V V38
2023-08-25 10:04:52 C 05 33 03.46 +33 33 50.2 – V V38
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)