136993 (1998 ST49)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.5954841834 ± 9.03e-09
Semi-major axis (a)2.3089660226 AU ± 1.05e-09
Inclination (i)24.47489654° ± 3.96e-06
Long. of Asc. Node (Ω)18.18522525° ± 1.53e-06
Arg. of Perihelion (ω)48.11355347° ± 3.84e-06
Mean Anomaly (M)253.30267173° ± 1.08e-06
Mean Motion (n)0.2809221367°/day ± 1.92e-10
Perihelion dist (q)0.93401328 AU ± 2.08e-08
Aphelion dist (Q)3.68391877 AU ± 2.09e-08
Orbital Period3.50853904 yr ± 2.39e-09
Physical Parameters
H (abs. magnitude)17.85
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.620″
Uncertainty0
Orbit TypeApollo
MOID0.053935 AU
Observations Used960
Radar Obs Used7
Oppositions10
Arc Total1998-2012
First Observation Used1998-09-29
Last Observation Used2020-04-28
Observations (1267)
Date Type RA Dec Mag Band Observatory
1999-01-23 04:00:29 C 14 01 59.15 +27 24 57.1 c 561
1999-01-23 12:30:11 C 14 01 45.63 +27 24 15.3 z 711
1999-01-23 12:49:09 C 14 01 45.06 +27 24 13.6 z 711
1999-02-19 10:39:13 C 13 20 43.21 +26 56 48.2 z 711
1999-02-19 10:49:26 C 13 20 42.17 +26 56 47.4 z 711
1999-02-20 10:52:15 C 13 18 18.51 +26 54 27.4 z 711
1999-02-20 11:02:30 C 13 18 17.37 +26 54 26.4 z 711
1999-03-14 07:56:18 C 12 20 28.27 +24 29 10.2 z 711
1999-03-14 08:06:27 C 12 20 27.15 +24 29 05.4 z 711
2003-01-29 08:30:04 C 14 49 18.20 -18 59 31.9 c 809
2003-01-29 08:33:34 C 14 49 18.26 -18 59 33.0 c 809
2003-01-29 08:37:06 C 14 49 18.33 -18 59 34.0 c 809
2003-01-30 08:28:07 C 14 49 47.14 -19 07 01.5 c 809
2003-01-30 08:31:37 C 14 49 47.18 -19 07 02.3 c 809
2003-01-30 08:35:06 C 14 49 47.26 -19 07 03.6 c 809
2005-07-28 08:30:10 C 01 25 59.16 -27 44 01.9 r 734
2005-07-28 08:42:51 C 01 26 00.17 -27 44 00.7 r 734
2005-07-28 08:55:33 C 01 26 01.06 -27 43 58.8 r 734
2005-09-15 10:25:02 C 03 01 41.30 -18 03 04.8 r 703
2005-09-15 10:36:44 C 03 01 42.52 -18 02 45.3 r 703
2005-09-15 10:48:27 C 03 01 43.71 -18 02 24.3 r 703
2005-09-24 01:47:46 C 03 29 43.78 -09 23 53.9 o J68
2005-09-24 06:34:05 C 03 30 31.24 -09 05 50.0 r I77
2005-09-24 06:34:50 C 03 30 31.36 -09 05 47.2 r I77
2005-09-27 08:04:38 C 03 44 20.51 -03 52 39.0 c 844
2005-09-27 08:07:24 C 03 44 21.05 -03 52 25.2 c 844
2005-09-27 08:10:12 C 03 44 21.60 -03 52 11.7 c 844
2005-09-27 08:18:35 C 03 44 23.28 -03 51 30.2 c 844
2005-09-27 08:21:21 C 03 44 23.82 -03 51 16.4 c 844
2005-09-27 08:24:11 C 03 44 24.36 -03 51 02.6 c 844
2005-09-27 08:26:59 C 03 44 24.92 -03 50 49.0 c 844
2005-09-27 08:29:48 C 03 44 25.52 -03 50 34.8 c 844
2005-09-27 08:32:35 C 03 44 26.06 -03 50 21.1 c 844
2005-09-27 08:35:21 C 03 44 26.62 -03 50 07.5 c 844
2005-09-29 08:12:36 C 03 55 12.46 +00 28 47.2 c 844
2005-09-29 08:15:19 C 03 55 13.08 +00 29 03.4 c 844
2005-09-29 08:18:02 C 03 55 13.70 +00 29 19.6 c 844
2005-09-29 08:20:43 C 03 55 14.35 +00 29 35.7 c 844
2005-09-29 08:23:28 C 03 55 14.96 +00 29 51.9 c 844
2005-09-29 08:26:13 C 03 55 15.63 +00 30 08.2 c 844
2005-09-29 08:28:57 C 03 55 16.19 +00 30 24.4 c 844
2005-09-29 08:31:38 C 03 55 16.87 +00 30 40.7 c 844
2005-09-29 08:34:22 C 03 55 17.51 +00 30 57.3 c 844
2005-09-29 08:37:05 C 03 55 18.11 +00 31 13.3 c 844
2005-09-29 15:51:54 C 03 57 08.61 +01 14 13.5 r 379
2005-09-29 15:53:33 C 03 57 09.02 +01 14 23.9 r 379
2005-09-29 15:55:09 C 03 57 09.41 +01 14 33.6 r 379
2005-09-29 16:00:02 C 03 57 10.57 +01 15 03.6 r 379
2005-09-29 16:01:39 C 03 57 10.97 +01 15 13.7 r 379
2005-09-29 16:08:49 C 03 57 12.70 +01 15 58.1 r 379
Radar Observations (7)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2012-10-15 01:30:00 103676.181 2 Hz 2380 -1 -1
2012-10-15 01:43:00 79585327.19 4 us 2380 -1 -1
2012-10-16 01:21:00 76431984.89 4 us 2380 -1 -1
2012-10-17 01:14:00 74366245.24 2 us 2380 -1 -1
2012-10-18 05:20:00 -4600.368 4 Hz 8560 -14 -14
2012-10-18 23:56:00 73851720.04 2 us 2380 -1 -1
2012-10-19 23:57:00 75404704.71 2 us 2380 -1 -1
Station codes
-14 DSS-14 Goldstone (70-m) -1 Arecibo (305-m, 1963–2020)