18736 (1998 NU)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.4911399789 ± 8.50e-09
Semi-major axis (a)2.3496959498 AU ± 1.22e-09
Inclination (i)2.80616050° ± 8.43e-07
Long. of Asc. Node (Ω)297.42195380° ± 1.66e-05
Arg. of Perihelion (ω)222.90480980° ± 1.67e-05
Mean Anomaly (M)309.18689309° ± 6.93e-07
Mean Motion (n)0.2736495723°/day ± 2.12e-10
Perihelion dist (q)1.19566633 AU ± 2.00e-08
Aphelion dist (Q)3.50372557 AU ± 2.01e-08
Orbital Period3.60178266 yr ± 2.80e-09
Physical Parameters
H (abs. magnitude)15.98
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.233″
Uncertainty0
Orbit TypeAmor
MOID0.207942 AU
Observations Used1910
Oppositions52
Arc Total1954-2026
First Observation Used1954-05-25
Last Observation Used2026-01-12
Observations (2071)
Date Type RA Dec Mag Band Observatory
1954-05-25 04:09:59 12 21 11.82 -09 27 38.5 261
1954-05-25 04:54:59 12 21 15.86 -09 27 54.1 261
1954-05-25 05:01:00 12 21 16.46 -09 27 55.9 261
1954-05-25 05:15:59 12 21 17.86 -09 28 02.3 261
1989-12-17 04:12:59 03 47 56.83 +24 35 03.0 261
1989-12-17 05:23:00 03 47 52.85 +24 34 43.7 261
1998-07-02 09:12:18 c 21 13 50.95 -15 37 57.2 i 691
1998-07-02 09:43:17 c 21 13 49.94 -15 38 01.0 i 691
1998-07-02 10:14:16 c 21 13 48.93 -15 38 04.8 i 691
1998-07-03 08:34:55 c 21 13 05.90 -15 40 36.7 i 691
1998-07-03 08:43:11 c 21 13 05.60 -15 40 37.9 i 691
1998-07-03 08:51:24 c 21 13 05.35 -15 40 38.8 i 691
1998-07-15 08:38:15 c 21 02 24.15 -16 18 37.0 i 691
1998-07-15 09:09:17 c 21 02 22.85 -16 18 41.6 i 691
1998-07-15 09:40:18 c 21 02 21.53 -16 18 45.8 i 691
1998-07-18 07:12:50 c 20 59 27.18 -16 29 01.6 i 691
1998-07-18 07:21:14 c 20 59 26.85 -16 29 02.7 i 691
1998-07-18 07:30:06 c 20 59 26.48 -16 29 03.7 i 691
1998-07-18 23:19:54 C 20 58 46.00 -16 31 25.5 z 104
1998-07-18 23:26:05 C 20 58 45.70 -16 31 26.4 z 104
1998-07-18 23:32:15 C 20 58 45.45 -16 31 27.7 z 104
1998-07-18 23:50:45 C 20 58 44.66 -16 31 30.9 z 104
1998-07-24 23:58:17 C 20 52 25.62 -16 53 25.5 z 598
1998-07-25 00:07:13 C 20 52 25.20 -16 53 27.3 z 598
1998-07-25 00:15:34 C 20 52 24.85 -16 53 28.4 z 598
1998-07-26 23:03:21 C 20 50 19.39 -17 00 37.6 z 598
1998-07-26 23:10:30 C 20 50 18.97 -17 00 38.5 z 598
1998-07-26 23:17:56 C 20 50 18.61 -17 00 39.9 z 598
1998-07-26 23:26:09 C 20 50 18.25 -17 00 41.6 z 598
1998-07-26 23:33:05 C 20 50 17.88 -17 00 42.1 z 598
1998-07-27 07:03:55 c 20 49 57.71 -17 01 50.0 i 691
1998-07-27 07:12:38 c 20 49 57.31 -17 01 51.2 i 691
1998-07-27 07:21:03 c 20 49 56.96 -17 01 52.5 i 691
1999-10-05 03:08:48 C 23 27 02.96 +00 11 39.5 b 691
1999-10-05 03:14:14 C 23 27 02.78 +00 11 38.2 b 691
1999-10-05 03:20:03 C 23 27 02.56 +00 11 37.2 b 691
1999-10-11 04:22:26 C 23 22 12.22 -00 20 56.8 b 691
1999-10-11 04:53:28 C 23 22 11.21 -00 21 03.1 b 691
1999-10-11 05:24:22 C 23 22 10.18 -00 21 09.6 b 691
1999-10-13 06:12:08 C 23 20 39.531 -00 31 32.99 e 645
1999-10-13 06:17:08 C 23 20 39.393 -00 31 33.96 21.95 e 645
1999-10-16 04:15:34 C 23 18 36.61 -00 45 52.4 b 691
1999-10-16 04:34:45 C 23 18 36.04 -00 45 56.4 b 691
1999-10-16 04:50:52 C 23 18 35.60 -00 45 59.1 b 691
2000-09-27 10:17:42 C 06 54 38.08 +25 15 34.5 18.7 c 704
2000-09-27 10:33:34 C 06 54 39.69 +25 15 32.1 19.6 c 704
2000-09-27 10:49:48 C 06 54 41.26 +25 15 30.8 19.1 c 704
2000-09-27 11:05:40 C 06 54 42.94 +25 15 28.9 18.5 c 704
2000-09-27 11:21:32 C 06 54 44.56 +25 15 26.9 18.7 c 704
2000-11-01 10:38:53 C 08 25 28.91 +21 30 49.4 18.8 c 704