277475 (2005 WK4)

NEO PHA MOID ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.2373105312 ± 9.46e-08
Semi-major axis (a)1.0105180071 AU ± 4.79e-09
Inclination (i)9.84362787° ± 6.82e-06
Long. of Asc. Node (Ω)138.10953511° ± 4.66e-06
Arg. of Perihelion (ω)74.13737467° ± 7.93e-06
Mean Anomaly (M)111.39214008° ± 4.21e-05
Mean Motion (n)0.9702780144°/day ± 6.90e-09
Perihelion dist (q)0.77071144 AU ± 9.57e-08
Aphelion dist (Q)1.25032457 AU ± 9.58e-08
Orbital Period1.01581842 yr ± 7.23e-09
Physical Parameters
H (abs. magnitude)20.22
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-06-01
RMS Residual1.403″
Uncertainty0
Orbit TypeApollo
MOID0.002448 AU
Observations Used286
Radar Obs Used12
Oppositions1
Arc Total2005-2014
First Observation Used2005-11-27
Last Observation Used2014-08-12
Observations (325)
Date Type RA Dec Mag Band Observatory
2010-09-27 08:27:01 C 02 45 21.40 -21 22 28.9 o H21
2010-09-27 08:37:04 C 02 45 20.48 -21 22 44.2 o H21
2010-09-29 02:22:08 C 02 41 40.31 -22 27 03.5 v 204
2010-09-29 02:33:24 C 02 41 39.22 -22 27 20.5 v 204
2010-10-17 13:00:40 C 01 51 54.94 -30 25 53.0 r E12
2010-10-17 13:35:51 C 01 51 50.43 -30 26 12.9 r E12
2010-10-19 13:04:54 C 01 46 11.25 -30 49 25.5 r E12
2010-10-19 13:12:02 C 01 46 10.33 -30 49 29.1 r E12
2010-10-19 13:50:20 C 01 46 05.49 -30 49 45.3 r E12
2010-10-19 13:57:27 C 01 46 04.61 -30 49 48.8 r E12
2010-11-04 05:42:10 C 01 08 38.22 -30 51 00.8 r 703
2010-11-04 05:48:44 C 01 08 37.60 -30 50 55.2 r 703
2010-11-04 05:55:19 C 01 08 37.17 -30 50 53.0 r 703
2010-11-04 06:01:55 C 01 08 36.56 -30 50 50.6 r 703
2011-08-31 09:44:43 C 02 33 40.83 -10 35 51.3 19.0 c 704
2011-08-31 10:04:26 C 02 33 39.79 -10 36 33.6 18.9 c 704
2011-08-31 10:24:55 C 02 33 38.74 -10 37 17.4 19.3 c 704
2011-08-31 10:44:27 C 02 33 37.72 -10 38 00.0 19.3 c 704
2011-08-31 11:05:58 C 02 33 36.64 -10 38 45.7 19.1 c 704
2011-09-18 09:18:00 C 02 00 44.03 -25 13 08.2 18.9 c 704
2011-09-18 09:35:56 C 02 00 41.93 -25 13 40.3 18.8 c 704
2011-09-18 09:53:52 C 02 00 39.85 -25 14 11.5 18.8 c 704
2011-09-18 10:29:52 C 02 00 35.57 -25 15 14.7 19.2 c 704
2011-11-16 05:52:03 C 00 11 48.381 -28 12 50.57 L F51
2011-11-16 06:06:48 C 00 11 48.400 -28 12 38.74 L F51
2012-07-27 01:15:25 C 02 53 25.72 +25 23 17.3 r A17
2012-07-27 01:24:25 C 02 53 24.79 +25 22 46.6 r A17
2012-07-27 01:37:55 C 02 53 23.45 +25 22 01.3 r A17
2012-08-10 02:18:10 C 02 24 08.18 +04 54 18.3 u 160
2012-08-10 02:20:22 C 02 24 07.95 +04 54 09.6 u 160
2012-08-19 00:11:13 C 02 03 21.46 -08 27 15.1 r 106
2012-08-19 00:34:44 C 02 03 18.70 -08 28 40.6 r 106
2012-08-19 00:58:14 C 02 03 15.90 -08 30 06.8 r 106
2012-08-19 01:21:46 C 02 03 13.07 -08 31 33.0 r 106
2012-08-19 02:51:06 C 02 03 02.43 -08 36 57.8 u 160
2012-08-19 02:55:06 C 02 03 01.93 -08 37 12.1 u 160
2012-08-19 02:59:03 C 02 03 01.44 -08 37 26.5 u 160
2012-08-20 01:57:38 C 02 00 30.37 -10 00 38.3 u 160
2012-08-20 02:00:38 C 02 00 30.01 -10 00 48.8 u 160
2012-08-20 02:03:37 C 02 00 29.60 -10 01 00.0 u 160
2012-10-14 12:17:16 C 23 29 34.44 -37 11 15.4 r E12
2012-10-14 12:30:55 C 23 29 33.79 -37 11 08.2 r E12
2012-10-14 12:44:46 C 23 29 33.28 -37 11 00.6 r E12
2012-10-14 12:58:33 C 23 29 32.71 -37 10 53.8 r E12
2013-08-02 01:44:55 C 06 01 30.04 +55 38 37.3 q 470
2013-08-02 01:49:32 C 06 01 25.30 +55 38 28.4 q 470
2013-08-03 01:13:30 C 05 35 37.76 +54 23 41.6 q 470
2013-08-03 01:14:40 C 05 35 36.38 +54 23 37.5 q 470
2013-08-04 23:18:53 C 04 34 32.90 +49 26 34.4 o B67
2013-08-04 23:24:11 C 04 34 25.17 +49 25 48.4 o B67
Radar Observations (12)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
2012-07-23 10:47:00 27226.5106 0.4 Hz 2380 -1 -1
2013-08-03 11:30:00 393710.727 1.5 Hz 8560 -14 -14
2013-08-03 11:40:00 34394368.79 10 us 8560 -14 -14
2013-08-03 12:10:00 34311765.95 1 us 8560 -14 -14
2013-08-05 10:20:00 328621.45 0.5 Hz 8560 -14 -14
2013-08-05 10:30:00 27477333.91 1 us 8560 -14 -14
2013-08-05 11:30:00 27340102.75 0.5 us 8560 -14 -14
2013-08-06 08:20:00 24822631.94 0.5 us 8560 -14 -14
2013-08-07 08:00:00 22542279.99 0.5 us 8560 -14 -14
2013-08-07 11:06:00 22275670.49 0.5 us 2380 -1 -1
2013-08-08 09:00:00 21033672.11 0.25 us 8560 -14 -14
2013-08-09 09:50:00 20662835.48 0.25 us 8560 -14 -14
Station codes
-14 DSS-14 Goldstone (70-m) -1 Arecibo (305-m, 1963–2020)