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
2019-08-24 10:29:33 C 00 13 06.69 +07 51 33.0 – U I41
2019-08-24 11:37:31 C 00 13 04.22 +07 51 24.8 – U I41
2019-08-27 09:29:09 C 00 10 31.51 +07 42 39.9 – U I41
2019-08-27 09:59:24 C 00 10 30.34 +07 42 36.1 – U I41
2019-08-28 06:49:26 C 00 09 42.79 +07 39 43.8 – o 691
2019-08-28 07:13:28 C 00 09 41.79 +07 39 40.3 – o 691
2019-08-28 07:39:19 C 00 09 40.85 +07 39 36.6 – o 691
2019-08-30 01:09:44 C 00 08 02.86 +07 33 31.1 – q 215
2019-08-30 01:12:31 C 00 08 02.73 +07 33 30.9 – q 215
2019-08-30 01:15:16 C 00 08 02.60 +07 33 30.7 – q 215
2019-08-30 09:22:41 C 00 07 43.04 +07 32 16.6 – U I41
2019-08-30 09:31:28 C 00 07 42.68 +07 32 15.3 – U I41
2019-08-30 11:37:14 C 00 07 37.50 +07 31 56.1 – U I41
2019-08-31 10:49:42 C 00 06 40.69 +07 28 15.9 – U I41
2019-08-31 13:53:25 C 00 06 33.102 +07 27 47.07 – U F51
2019-08-31 14:11:44 C 00 06 32.331 +07 27 44.09 – U F51
2019-08-31 14:29:58 C 00 06 31.563 +07 27 41.12 – U F51
2019-09-03 10:28:13 C 00 03 38.48 +07 16 02.8 – V G96
2019-09-03 10:38:40 C 00 03 38.01 +07 16 01.0 – V G96
2019-09-03 10:49:05 C 00 03 37.55 +07 15 59.0 – V G96
2019-09-03 10:59:32 C 00 03 37.08 +07 15 57.2 – V G96
2019-09-07 07:58:09 C 23 59 26.48 +06 58 06.5 – V 703
2019-09-07 08:05:49 C 23 59 26.08 +06 58 04.5 – V 703
2019-09-07 08:13:29 C 23 59 25.69 +06 58 02.0 – V 703
2019-09-07 08:21:08 C 23 59 25.32 +06 58 02.4 – V 703
2019-09-19 21:38:57 C 23 44 28.67 +05 46 21.1 – t A71
2019-09-19 22:03:32 C 23 44 27.38 +05 46 13.1 – t A71
2019-09-23 21:43:18 C 23 39 26.38 +05 19 51.0 – q L27
2019-09-23 22:05:30 C 23 39 25.20 +05 19 44.4 – q L27
2019-09-23 22:27:41 C 23 39 24.00 +05 19 37.9 – q L27
2019-09-24 06:52:39 C 23 38 57.32 +05 17 15.3 – V H06
2019-09-24 06:56:55 C 23 38 57.08 +05 17 14.0 – V H06
2019-09-24 07:01:11 C 23 38 56.84 +05 17 13.1 – V H06
2019-09-25 15:53:14 C 23 37 12.69 +05 07 48.7 – q Q11
2019-09-25 16:03:27 C 23 37 12.15 +05 07 45.8 – q Q11
2019-09-25 16:13:44 C 23 37 11.60 +05 07 42.8 – q Q11
2019-09-26 21:45:23 C 23 35 38.22 +04 59 08.7 – q L27
2019-09-26 22:16:58 C 23 35 36.58 +04 58 59.8 – q L27
2019-09-28 21:34:34 C 23 33 06.99 +04 45 05.7 – q L27
2019-09-28 21:57:08 C 23 33 05.81 +04 44 59.5 – q L27
2019-09-28 22:19:42 C 23 33 04.63 +04 44 53.2 – q L27
2019-09-29 08:49:32 C 23 32 31.518 +04 41 47.38 – U F51
2019-09-29 09:25:51 C 23 32 29.572 +04 41 36.62 – U F51
2019-09-29 09:44:01 C 23 32 28.598 +04 41 31.25 – U F51
2019-09-29 20:54:39 C 23 31 53.50 +04 38 10.2 – q L27
2019-09-29 21:10:41 C 23 31 52.64 +04 38 05.7 – q L27
2019-09-29 22:01:33 C 23 31 49.93 +04 37 50.6 – q L27
2019-10-01 06:13:06 C 23 30 08.86 +04 28 14.2 – V G96
2019-10-01 06:20:36 C 23 30 08.46 +04 28 12.0 – V G96
2019-10-04 14:37:58 C 23 25 59.32 +04 04 00.6 – q Q11
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)