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
2005-10-28 03:27:45 C 12 00 10.35 +57 21 07.1 o 084
2005-10-28 03:33:04 C 12 00 12.59 +57 20 57.9 o 084
2005-12-24 11:17:13 C 14 12 36.64 +35 52 00.4 18.3 c 704
2005-12-24 11:36:48 C 14 12 36.98 +35 51 52.8 18.9 c 704
2005-12-24 11:56:38 C 14 12 37.34 +35 51 44.1 19.2 c 704
2005-12-24 12:15:43 C 14 12 37.57 +35 51 34.0 19.1 c 704
2005-12-24 12:34:47 C 14 12 37.93 +35 51 27.8 19.4 c 704
2006-02-06 09:56:32 C 13 45 14.83 +33 01 01.3 18.9 c 704
2006-02-06 10:14:45 C 13 45 13.18 +33 01 02.1 18.9 c 704
2006-02-06 10:33:17 C 13 45 11.60 +33 01 01.3 19.2 c 704
2006-02-06 10:51:56 C 13 45 09.93 +33 01 01.0 19.1 c 704
2006-02-06 11:10:26 C 13 45 08.15 +33 01 01.3 19.6 c 704
2006-02-27 23:28:10 C 12 47 59.91 +31 43 36.3 r A13
2006-02-27 23:55:30 C 12 47 56.37 +31 43 26.8 r A13
2006-03-03 09:33:37 C 12 37 36.12 +31 11 40.3 r 703
2006-03-03 09:43:44 C 12 37 34.75 +31 11 34.9 r 703
2006-03-03 09:53:15 C 12 37 33.52 +31 11 30.3 r 703
2006-03-03 10:02:45 C 12 37 32.30 +31 11 26.8 r 703
2006-03-18 21:49:40 C 11 54 26.57 +27 33 34.9 o 198
2006-03-18 21:55:55 C 11 54 25.93 +27 33 30.4 o 198
2006-03-18 21:57:29 C 11 54 25.77 +27 33 29.3 o 198
2006-03-19 21:53:31 C 11 52 03.68 +27 16 22.7 r A13
2006-03-19 22:20:59 C 11 52 00.96 +27 16 02.9 r A13
2006-03-19 22:45:07 C 11 51 58.53 +27 15 45.9 r A13
2006-03-24 05:51:10 C 11 42 30.67 +25 59 36.6 r 703
2006-03-24 06:00:45 C 11 42 29.80 +25 59 29.4 r 703
2006-03-24 06:10:22 C 11 42 28.83 +25 59 22.9 r 703
2006-03-24 06:20:00 C 11 42 28.08 +25 59 15.5 r 703
2012-06-01 06:57:22 C 23 30 44.13 -32 54 14.2 L 309
2012-06-01 07:06:46 C 23 30 44.86 -32 54 13.3 L 309
2012-06-01 07:16:10 C 23 30 45.62 -32 54 12.3 L 309
2012-07-31 15:22:32 C 01 06 43.11 -33 20 06.7 t E10
2012-07-31 15:26:26 C 01 06 43.29 -33 20 07.5 t E10
2012-07-31 15:30:19 C 01 06 43.49 -33 20 08.0 t E10
2012-07-31 15:34:10 C 01 06 43.70 -33 20 08.7 t E10
2012-07-31 15:38:00 C 01 06 43.89 -33 20 09.3 t E10
2012-07-31 15:41:51 C 01 06 44.10 -33 20 10.1 t E10
2012-08-10 14:07:07 C 01 18 38.51 -34 00 48.2 t E10
2012-08-10 14:11:34 C 01 18 38.73 -34 00 49.1 t E10
2012-08-10 14:15:58 C 01 18 38.90 -34 00 49.9 t E10
2012-08-10 14:20:21 C 01 18 39.11 -34 00 51.1 t E10
2012-08-10 14:24:44 C 01 18 39.30 -34 00 51.9 t E10
2012-08-10 14:29:09 C 01 18 39.49 -34 00 52.8 t E10
2012-10-09 05:40:58 C 00 10 47.51 -19 56 12.9 u 448
2012-10-09 05:43:21 C 00 10 46.95 -19 55 58.5 r 703
2012-10-09 05:44:03 C 00 10 46.35 -19 55 54.7 u 448
2012-10-09 05:47:09 C 00 10 45.19 -19 55 36.6 u 448
2012-10-09 05:50:14 C 00 10 44.03 -19 55 18.5 u 448
2012-10-09 05:50:41 C 00 10 44.18 -19 55 15.1 r 703
2012-10-09 05:53:18 C 00 10 42.88 -19 55 00.3 u 448
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)