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
2008-09-05 00:23:02 C 23 21 03.90 +02 51 03.4 J22
2008-09-05 00:28:24 C 23 20 56.14 +02 49 56.5 J22
2008-09-06 05:01:15 C 22 43 57.76 -02 48 14.1 r H45
2008-09-06 05:02:28 C 22 43 56.24 -02 48 27.6 r H45
2008-09-06 05:03:10 C 22 43 55.36 -02 48 34.7 r H45
2008-09-06 05:03:42 C 22 43 54.63 -02 48 40.8 r H45
2008-09-06 05:04:34 C 22 43 53.60 -02 48 50.6 r H45
2008-09-06 05:05:05 C 22 43 52.86 -02 48 56.4 r H45
2008-09-06 05:05:37 C 22 43 52.29 -02 49 01.8 r H45
2008-09-06 05:06:09 C 22 43 51.58 -02 49 07.9 r H45
2008-09-07 07:08:54 C 22 14 44.70 -07 10 07.1 r 703
2008-09-07 07:18:12 C 22 14 34.62 -07 11 31.4 r 703
2008-09-07 07:27:32 C 22 14 24.54 -07 12 55.5 r 703
2008-09-07 07:36:54 C 22 14 14.38 -07 14 19.8 r 703
2008-09-07 09:06:00 C 22 12 38.95 -07 27 36.6 r 703
2008-09-07 09:11:01 C 22 12 33.66 -07 28 21.2 r 703
2008-09-07 09:16:01 C 22 12 28.40 -07 29 05.4 r 703
2008-09-07 09:21:04 C 22 12 23.04 -07 29 49.8 r 703
2008-09-08 23:27:40 C 21 38 22.82 -12 20 56.1 r 130
2008-09-08 23:31:18 C 21 38 19.95 -12 21 18.8 r 130
2008-09-08 23:34:55 C 21 38 16.89 -12 21 41.8 r 130
2008-09-08 23:38:43 C 21 38 13.77 -12 22 06.4 r 130
2018-08-28 19:48:11 C 14 26 11.63 +60 32 04.4 V 204
2018-08-28 19:53:22 C 14 26 57.39 +60 28 38.2 V 204
2018-08-28 19:58:33 C 14 27 43.05 +60 25 11.1 V 204
2018-08-28 20:03:44 C 14 28 28.65 +60 21 42.6 V 204
2018-08-28 20:08:55 C 14 29 14.06 +60 18 13.3 V 204
2018-08-28 20:13:36 C 14 29 52.04 +60 14 59.7 18.2 V 104
2018-08-28 20:19:45 C 14 30 45.85 +60 10 47.5 18.1 V 104
2018-08-28 20:25:54 C 14 31 39.48 +60 06 33.9 18.1 V 104
2018-08-29 22:18:58 C 16 55 59.50 +34 52 59.7 q J95
2018-08-29 22:21:25 C 16 56 06.91 +34 50 23.6 q J95
2018-08-29 22:24:03 C 16 56 14.72 +34 47 38.4 q J95
2018-08-29 22:27:03 C 16 56 23.71 +34 44 28.9 V J95
2018-08-29 22:29:28 C 16 56 30.88 +34 41 57.0 V J95
2018-08-29 22:31:52 C 16 56 38.08 +34 39 25.0 V J95
2018-08-29 22:34:51 C 16 56 46.96 +34 36 16.6 V J95
2018-08-29 22:57:51 C 16 57 55.08 +34 12 08.3 V J95
2018-08-29 23:01:58 C 16 58 07.10 +34 07 51.7 V J95
2018-08-29 23:06:31 C 16 58 20.51 +34 03 05.5 V J95
2018-08-29 23:09:10 C 16 58 28.32 +34 00 18.4 V J95
2018-08-29 23:28:55 C 16 59 25.72 +33 39 37.4 q Z80
2018-08-29 23:42:43 C 17 00 05.70 +33 25 15.7 q Z80
2018-08-29 23:46:17 C 17 00 16.06 +33 21 33.6 q Z80
2018-08-29 23:57:50 C 17 00 49.20 +33 09 36.6 q Z80
2018-08-30 03:21:34 C 17 10 24.62 +29 53 51.3 U I41
2018-08-30 03:22:03 C 17 10 25.81 +29 53 21.7 U I41
2018-08-30 05:37:48 C 17 15 32.83 +27 42 15.4 U I41
2018-08-30 05:38:18 C 17 15 33.86 +27 41 47.6 U I41
2018-08-30 06:28:33 C 17 17 23.49 +26 54 16.7 U I41
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)