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
2018-08-30 06:29:02 C 17 17 24.55 +26 53 49.5 U I41
2018-08-30 20:52:13 C 17 43 24.63 +15 19 20.4 V J95
2018-08-30 20:58:17 C 17 43 32.48 +15 15 10.9 V J95
2018-08-30 21:04:59 C 17 43 41.15 +15 10 35.2 V J95
2018-08-31 03:12:40 C 17 51 38.98 +11 19 57.4 U I41
2018-08-31 03:13:09 C 17 51 39.50 +11 19 39.7 U I41
2018-08-31 03:34:22 C 17 52 01.16 +11 07 10.4 U I41
2018-08-31 03:34:51 C 17 52 01.56 +11 06 53.0 U I41
2018-08-31 03:56:03 C 17 52 13.53 +10 53 28.8 U H36
2018-08-31 03:59:19 C 17 52 16.95 +10 51 33.3 U H36
2018-08-31 04:01:29 C 17 52 19.18 +10 50 18.3 U H36
2018-08-31 04:02:53 C 17 52 20.62 +10 49 29.3 U H36
2018-08-31 04:04:05 C 17 52 28.85 +10 49 13.4 V V03
2018-08-31 04:05:30 C 17 52 30.27 +10 48 24.3 V V03
2018-08-31 04:06:12 C 17 52 30.98 +10 47 59.8 V V03
2018-08-31 04:06:57 C 17 52 31.77 +10 47 33.6 V V03
2018-08-31 07:54:09 C 17 56 28.84 +08 44 07.5 U T08
2018-08-31 08:08:29 C 17 56 41.82 +08 36 29.7 U T08
2018-08-31 08:23:53 C 17 56 55.78 +08 28 20.4 U T08
2018-08-31 19:57:38 C 18 07 21.30 +03 06 10.6 q C95
2018-08-31 20:08:04 C 18 07 28.21 +03 01 59.0 q C95
2018-08-31 20:18:29 C 18 07 35.13 +02 57 48.3 q C95
2018-08-31 20:22:15 C 18 07 41.07 +02 55 53.4 17.4 V Z43
2018-08-31 20:29:34 C 18 07 45.98 +02 52 58.1 17.2 V Z43
2018-08-31 20:36:35 C 18 07 50.60 +02 50 11.1 17.8 V Z43
2018-08-31 20:43:07 C 18 07 54.96 +02 47 36.0 17.7 V Z43
2018-08-31 20:50:09 C 18 07 59.64 +02 44 49.0 17.3 V Z43
2018-08-31 20:55:12 C 18 08 02.89 +02 42 33.6 V J69
2018-08-31 20:59:53 C 18 08 05.99 +02 40 42.7 V J69
2018-08-31 21:04:33 C 18 08 09.12 +02 38 53.0 V J69
2018-08-31 21:09:13 C 18 08 12.26 +02 37 03.2 V J69
2018-08-31 21:13:54 C 18 08 15.34 +02 35 12.9 V J69
2018-08-31 21:18:34 C 18 08 18.43 +02 33 23.6 V J69
2018-08-31 21:36:35 C 18 08 30.65 +02 26 21.2 V J95
2018-08-31 21:45:58 C 18 08 36.85 +02 22 43.1 V J95
2018-08-31 21:53:22 C 18 08 41.78 +02 19 51.6 V J95
2018-09-01 03:45:31 C 18 12 46.06 +00 14 12.2 q H06
2018-09-01 03:53:13 C 18 12 50.21 +00 11 35.6 q H06
2018-09-01 04:00:54 C 18 12 54.38 +00 08 58.7 q H06
2018-09-01 22:14:40 C 18 22 40.57 -04 59 23.7 U G40
2018-09-01 22:29:44 C 18 22 46.08 -05 02 54.8 U G40
2018-09-01 22:47:21 C 18 22 52.52 -05 07 00.1 U G40
2018-09-04 18:58:08 C 18 42 05.30 -14 42 05.3 v 587
2018-09-04 18:59:44 C 18 42 05.53 -14 42 13.2 v 587
2018-09-04 19:06:08 C 18 42 06.35 -14 42 45.3 v 587
2018-09-15 05:51:11 C 19 03 24.749 -22 54 31.51 V T12
2018-09-15 05:53:11 C 19 03 24.805 -22 54 33.02 V T12
2018-09-15 05:56:15 C 19 03 24.881 -22 54 35.33 V T12
2018-09-15 05:59:58 C 19 03 24.977 -22 54 38.04 V T12
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)