1998 EP4

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.4412437287 ± 2.79e-07
Semi-major axis (a)1.5598003366 AU ± 3.66e-07
Inclination (i)7.19070180° ± 4.32e-05
Long. of Asc. Node (Ω)352.69975340° ± 4.25e-05
Arg. of Perihelion (ω)266.59320739° ± 1.02e-04
Mean Anomaly (M)39.27227546° ± 1.65e-03
Mean Motion (n)0.5059513529°/day ± 1.78e-07
Perihelion dist (q)0.87154822 AU ± 4.80e-07
Aphelion dist (Q)2.24805245 AU ± 6.83e-07
Orbital Period1.94806532 yr ± 6.85e-07
Physical Parameters
H (abs. magnitude)21.50
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.549″
Uncertainty1
Orbit TypeApollo
MOID0.062471 AU
Observations Used71
Oppositions1
Arc Total1996-1998
First Observation Used1996-09-20
Last Observation Used1998-04-05
Observations (72)
Date Type RA Dec Mag Band Observatory
1996-09-20 09:54:56 C 00 16 40.39 +05 16 28.1 a 691
1996-09-20 10:25:20 C 00 16 37.02 +05 16 26.5 a 691
1996-09-20 10:56:06 C 00 16 33.63 +05 16 25.0 a 691
1998-03-02 09:52:02 c 12 14 25.31 +02 13 46.0 i 691
1998-03-02 10:22:23 c 12 14 24.59 +02 13 26.9 i 691
1998-03-02 10:52:36 c 12 14 23.89 +02 13 08.2 i 691
1998-03-03 10:03:37 c 12 13 59.08 +01 58 23.2 i 691
1998-03-03 10:09:21 c 12 13 58.94 +01 58 18.9 i 691
1998-03-03 10:15:35 c 12 13 58.77 +01 58 14.5 i 691
1998-03-04 08:59:45 c 12 13 31.10 +01 43 05.5 i 691
1998-03-04 09:05:05 c 12 13 30.96 +01 43 01.4 i 691
1998-03-04 09:10:36 c 12 13 30.78 +01 42 57.9 i 691
1998-03-05 08:21:29 c 12 12 58.50 +01 26 43.9 i 691
1998-03-05 08:26:53 c 12 12 58.33 +01 26 39.5 i 691
1998-03-05 08:33:44 c 12 12 58.10 +01 26 34.8 i 691
1998-03-05 10:45:20 C 12 12 54.16 +01 24 52.8 658
1998-03-05 10:51:18 C 12 12 54.02 +01 24 47.9 658
1998-03-05 10:56:26 C 12 12 53.84 +01 24 45.4 658
1998-03-17 09:08:52 C 11 59 14.23 -03 33 55.1 658
1998-03-17 09:12:33 C 11 59 13.90 -03 34 00.3 658
1998-03-17 09:19:08 C 11 59 13.36 -03 34 10.2 658
1998-03-18 13:23:07 C 11 56 59.59 -04 17 50.7 z 402
1998-03-18 13:26:07 C 11 56 59.37 -04 17 53.9 z 402
1998-03-18 13:29:08 C 11 56 59.12 -04 17 58.9 z 402
1998-03-18 13:32:07 C 11 56 58.80 -04 18 04.5 z 402
1998-03-18 14:10:30 C 11 56 55.28 -04 19 06.5 360
1998-03-18 14:17:00 C 11 56 54.68 -04 19 17.6 360
1998-03-18 14:24:00 C 11 56 54.00 -04 19 29.1 360
1998-03-18 23:57:00 C 11 56 03.73 -04 35 24.3 z 104
1998-03-19 00:01:29 C 11 56 03.29 -04 35 32.3 z 104
1998-03-19 00:05:40 C 11 56 02.91 -04 35 39.6 z 104
1998-03-20 13:38:45 C 11 52 34.07 -05 41 28.5 426
1998-03-20 13:44:06 C 11 52 33.47 -05 41 38.6 426
1998-03-20 13:49:28 C 11 52 32.84 -05 41 49.0 426
1998-03-22 15:10:29 C 11 47 10.16 -07 23 39.4 360
1998-03-22 15:17:00 C 11 47 09.30 -07 23 54.1 360
1998-03-22 15:22:45 C 11 47 08.52 -07 24 06.8 360
1998-03-22 21:44:36 C 11 46 23.69 -07 38 30.8 z 118
1998-03-22 21:57:55 C 11 46 21.93 -07 39 01.0 z 118
1998-03-22 22:39:56 C 11 46 16.47 -07 40 36.7 557
1998-03-22 22:48:54 C 11 46 15.28 -07 40 57.1 557
1998-03-22 22:54:50 C 11 46 14.48 -07 41 10.7 557
1998-03-22 23:05:53 C 11 46 13.04 -07 41 35.6 557
1998-03-23 21:14:48 C 11 43 25.70 -08 33 46.6 046
1998-03-23 21:16:56 C 11 43 25.49 -08 33 51.7 046
1998-03-23 21:19:12 C 11 43 25.04 -08 33 57.7 046
1998-03-23 21:22:58 C 11 43 24.54 -08 34 07.7 046
1998-03-24 21:44:45 C 11 40 02.76 -09 36 13.1 z 587
1998-03-24 21:49:34 C 11 40 01.97 -09 36 26.7 z 587
1998-03-25 01:13:10 C 11 39 29.51 -09 45 31.2 z 118