204131 (2003 YL)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.6324834176 ± 2.00e+00
Semi-major axis (a)1.1465001714 AU ± 3.00e+00
Inclination (i)5.65470944° ± 4.00e+00
Long. of Asc. Node (Ω)291.91664816° ± 5.00e+00
Arg. of Perihelion (ω)29.46037140° ± 6.00e+00
Mean Anomaly (M)8.47248026° ± 7.78e-06
Mean Motion (n)0.8028808329°/day ± 3.15e+00
Perihelion dist (q)0.42135782 AU ± 2.54e+00
Aphelion dist (Q)1.87164252 AU ± 5.41e+00
Orbital Period1.22761217 yr ± 4.82e+00
NGA Modelr2
A2-3.60155964e-06 AU/d²
Physical Parameters
H (abs. magnitude)19.94
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-04-29
RMS Residual0.300″
Uncertainty0
Orbit TypeApollo
MOID0.051368 AU
Observations Used361
Oppositions4
Arc Total2002-2026
First Observation Used2002-03-06
Last Observation Used2026-01-20
Observations (375)
Date Type RA Dec Mag Band Observatory
2004-01-12 06:09:26 C 06 02 31.40 +25 42 09.5 c 926
2004-01-27 02:31:11 C 05 38 55.01 +23 41 42.6 r 715
2004-01-27 02:43:28 C 05 38 54.62 +23 41 39.7 r 715
2004-01-27 02:55:41 C 05 38 54.23 +23 41 36.5 r 715
2007-02-23 10:28:35 C 12 54 12.72 -18 15 30.5 o 696
2007-02-23 10:38:08 C 12 54 12.46 -18 15 34.9 o 696
2007-03-27 14:16:55 C 11 24 30.42 -23 35 00.5 r E12
2007-03-27 14:32:15 C 11 24 26.24 -23 35 01.5 r E12
2007-03-27 15:03:10 C 11 24 17.67 -23 35 01.9 r E12
2007-04-08 10:59:50 C 09 43 27.55 -21 00 39.0 r E12
2007-04-08 11:12:00 C 09 43 22.22 -21 00 21.0 r E12
2007-04-08 11:36:23 C 09 43 11.24 -20 59 50.2 r E12
2007-04-12 12:22:50 C 08 59 21.44 -18 19 14.5 r E12
2007-04-12 12:36:08 C 08 59 15.14 -18 18 47.5 r E12
2007-04-12 12:49:26 C 08 59 08.88 -18 18 20.9 r E12
2007-04-12 13:02:43 C 08 59 02.58 -18 17 53.7 r E12
2008-10-28 11:54:09 C 10 04 00.82 +15 45 34.9 o 691
2008-10-28 12:22:18 C 10 04 01.24 +15 45 29.1 o 691
2008-12-22 09:16:44 C 09 30 36.57 +15 09 08.4 r G96
2008-12-22 09:24:08 C 09 30 35.82 +15 09 10.4 r G96
2008-12-22 09:31:30 C 09 30 35.06 +15 09 12.4 r G96
2008-12-22 09:38:45 C 09 30 34.34 +15 09 14.3 r G96
2008-12-30 11:07:10 C 09 09 11.97 +16 07 11.9 o 691
2008-12-30 11:33:16 C 09 09 08.68 +16 07 20.0 o 691
2008-12-30 11:59:42 C 09 09 05.43 +16 07 28.3 o 691
2009-01-07 11:27:55 C 08 44 08.19 +17 10 20.9 o 691
2009-01-07 11:54:27 C 08 44 04.44 +17 10 30.6 o 691
2009-01-07 12:17:02 C 08 44 01.30 +17 10 37.1 o 691
2009-01-15 06:03:29 C 08 18 22.67 +18 06 36.2 o 691
2009-01-15 06:29:57 C 08 18 18.97 +18 06 44.6 o 691
2009-01-15 06:56:01 C 08 18 15.29 +18 06 51.7 o 691
2009-01-20 03:58:57 C 08 02 31.45 +18 36 07.3 o 691
2009-01-20 04:25:05 C 08 02 28.02 +18 36 13.1 o 691
2009-01-20 04:56:10 C 08 02 23.85 +18 36 20.5 o 691
2013-02-15 11:37:01 C 10 51 01.658 -01 44 44.14 L F51
2013-02-15 11:56:43 C 10 50 59.745 -01 44 38.01 L F51
2013-02-15 12:16:24 C 10 50 57.858 -01 44 31.91 L F51
2013-03-04 07:13:43 C 10 07 46.507 +01 10 38.40 L F51
2013-03-04 07:34:12 C 10 07 44.106 +01 10 49.23 L F51
2013-03-04 07:54:43 C 10 07 41.703 +01 10 59.98 L F51
2013-05-31 06:19:25 C 09 08 32.679 +09 49 54.72 L F51
2013-05-31 06:32:41 C 09 08 33.239 +09 49 53.84 L F51
2013-05-31 06:39:18 C 09 08 33.485 +09 49 53.01 L F51
2014-01-03 09:10:18 C 09 57 03.84 +10 01 28.5 u H21
2014-01-03 09:25:47 C 09 57 02.76 +10 01 31.1 u H21
2014-01-03 09:46:28 C 09 57 01.31 +10 01 35.3 u H21
2014-01-09 09:47:33 C 09 45 59.70 +10 33 00.4 q G96
2014-01-09 09:54:19 C 09 45 59.18 +10 33 01.6 q G96
2014-01-09 10:01:05 C 09 45 58.59 +10 33 03.6 q G96
2014-01-09 10:07:52 C 09 45 58.01 +10 33 05.0 q G96
Radar Observations (1)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2014-12-05 17:44:00 307241.2161 0.1 Hz 2380 -1 -1
Station codes
-1 Arecibo (305-m, 1963–2020)