1998 SD9

NEO MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.5043838656 ± 1.22e-07
Semi-major axis (a)0.7024881787 AU ± 2.02e-09
Inclination (i)2.98736005° ± 4.86e-06
Long. of Asc. Node (Ω)165.74571161° ± 1.89e-05
Arg. of Perihelion (ω)7.70461867° ± 2.84e-05
Mean Anomaly (M)233.04631465° ± 4.54e-05
Mean Motion (n)1.6739934158°/day ± 7.23e-09
Perihelion dist (q)0.34816448 AU ± 8.56e-08
Aphelion dist (Q)1.05681188 AU ± 8.56e-08
Orbital Period0.58878743 yr ± 2.54e-09
NGA Modelr2
A2-2.88391468e-13 ± 2.02e-15 AU/d²
Physical Parameters
H (abs. magnitude)24.09
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.648″
Uncertainty0
Orbit TypeAten
MOID0.008421 AU
Observations Used146
Radar Obs Used1
Oppositions14
Arc Total1998-2018
First Observation Used1998-09-18
Last Observation Used2018-09-15
Observations (149)
Date Type RA Dec Mag Band Observatory
1998-09-18 07:51:52 C 23 42 29.08 -10 42 43.0 19.0 a 704
1998-09-18 08:10:43 C 23 42 11.90 -10 44 59.6 18.2 a 704
1998-09-18 08:29:44 C 23 41 54.79 -10 47 16.9 18.4 a 704
1998-09-18 08:48:33 C 23 41 37.59 -10 49 28.9 18.3 a 704
1998-09-19 08:16:23 C 23 21 21.25 -13 33 29.7 673
1998-09-19 08:21:28 C 23 21 16.73 -13 34 03.4 673
1998-09-19 08:27:46 C 23 21 11.08 -13 34 46.7 673
1998-09-19 08:52:23 C 23 20 48.96 -13 37 31.3 673
1998-09-19 09:49:03 C 23 20 11.55 -13 40 49.4 422
1998-09-19 09:53:41 C 23 20 07.50 -13 41 21.1 422
1998-09-19 09:56:02 C 23 20 05.46 -13 41 36.2 422
1998-09-19 11:52:44 C 23 18 20.99 -13 54 49.8 422
1998-09-19 11:54:36 C 23 18 19.27 -13 55 03.0 422
1998-09-21 06:10:15 C 22 42 44.16 -18 16 41.3 19.0 a 704
1998-09-21 06:42:23 C 22 42 16.67 -18 19 37.1 19.6 a 704
1998-09-21 07:14:23 C 22 41 49.52 -18 22 33.0 19.6 a 704
1998-09-21 07:46:18 C 22 41 22.56 -18 25 21.4 20.0 a 704
1998-09-21 23:27:08 C 22 28 56.63 -19 47 25.8 21.5 954
1998-09-21 23:27:40 C 22 28 56.19 -19 47 28.5 954
1998-09-21 23:28:09 C 22 28 55.76 -19 47 30.4 954
1998-09-21 23:28:38 C 22 28 55.40 -19 47 33.2 954
1998-09-21 23:29:07 C 22 28 55.00 -19 47 35.8 954
1998-09-22 12:17:30 C 22 19 01.92 -20 46 43.8 422
1998-09-22 12:18:40 C 22 19 00.76 -20 46 50.7 422
1998-09-22 12:23:04 C 22 18 57.36 -20 47 10.1 422
1998-09-22 12:24:28 C 22 18 56.25 -20 47 16.3 422
1998-09-22 12:25:31 C 22 18 55.38 -20 47 21.0 422
2008-08-30 07:51:52 C 02 33 30.43 +25 51 09.6 19.2 c 704
2008-08-30 08:10:19 C 02 33 08.92 +25 49 41.1 20.1 c 704
2008-08-30 08:28:46 C 02 32 47.29 +25 48 12.7 18.9 c 704
2008-08-30 08:47:17 C 02 32 25.44 +25 46 43.6 19.0 c 704
2008-08-30 09:05:50 C 02 32 03.45 +25 45 13.0 18.9 c 704
2008-09-04 06:02:19 C 23 47 16.33 +06 45 53.1 17.6 c 704
2008-09-04 06:21:29 C 23 46 47.09 +06 41 45.6 17.8 c 704
2008-09-04 06:40:34 C 23 46 17.86 +06 37 39.0 17.8 c 704
2008-09-04 06:59:46 C 23 45 48.49 +06 33 30.7 17.8 c 704
2008-09-04 07:18:46 C 23 45 19.42 +06 29 24.8 18.1 c 704
2008-09-04 21:36:32 C 23 24 56.90 +03 25 27.3 r B40
2008-09-04 21:37:45 C 23 24 55.12 +03 25 11.6 r B40
2008-09-04 21:40:39 C 23 24 50.87 +03 24 34.2 r B40
2008-09-04 21:46:16 C 23 24 42.73 +03 23 24.4 r B40
2008-09-04 21:50:46 C 23 24 36.22 +03 22 27.4 r B40
2008-09-04 22:00:42 C 23 24 20.14 +03 19 46.0 o B58
2008-09-04 22:09:43 C 23 24 07.08 +03 17 50.8 o B58
2008-09-04 22:12:58 C 23 24 02.40 +03 17 09.9 o B58
2008-09-04 22:24:29 C 23 23 47.17 +03 15 21.4 o B40
2008-09-04 22:27:09 C 23 23 43.23 +03 14 46.9 o B40
2008-09-04 22:31:54 C 23 23 36.38 +03 13 47.4 o B40
2008-09-05 00:03:57 C 23 21 31.63 +02 55 04.2 J22
2008-09-05 00:17:40 C 23 21 11.71 +02 52 11.4 J22
Radar Observations (1)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2018-08-30 22:58:00 14770262.26 4 us 2380 -1 -1
Station codes
-1 Arecibo (305-m, 1963–2020)