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
2005-11-27 15:18:54 C 05 53 07.29 -21 11 17.2 r E12
2005-11-27 15:31:39 C 05 53 06.14 -21 11 30.8 r E12
2005-11-27 15:44:15 C 05 53 05.10 -21 11 44.4 r E12
2005-11-27 15:56:38 C 05 53 04.12 -21 11 58.2 r E12
2005-11-27 16:48:29 C 05 52 59.70 -21 12 52.2 r E12
2005-11-27 17:00:16 C 05 52 58.72 -21 13 04.1 r E12
2005-11-27 17:12:10 C 05 52 57.72 -21 13 17.4 r E12
2005-11-27 17:23:59 C 05 52 56.71 -21 13 29.7 r E12
2005-11-27 17:38:40 C 05 52 55.50 -21 13 46.1 r E12
2005-11-27 17:43:23 C 05 52 54.97 -21 13 49.1 r E12
2005-11-27 17:48:07 C 05 52 54.68 -21 13 54.8 r E12
2005-11-28 10:59:30 C 05 51 37.75 -21 32 03.4 r E12
2005-11-28 11:00:46 C 05 51 37.72 -21 32 04.7 r E12
2005-11-28 11:02:02 C 05 51 37.64 -21 32 05.7 r E12
2005-11-28 11:03:16 C 05 51 37.55 -21 32 07.5 r E12
2005-11-28 11:04:32 C 05 51 37.45 -21 32 08.0 r E12
2005-11-30 06:27:00 C 05 47 59.56 -22 17 43.5 r 734
2005-11-30 06:39:28 C 05 47 58.38 -22 17 56.1 r 734
2005-11-30 06:42:34 C 05 47 58.05 -22 17 59.6 r 734
2005-11-30 06:49:50 C 05 47 57.84 -22 18 01.9 r 448
2005-11-30 06:57:28 C 05 47 57.16 -22 18 10.2 r 448
2005-11-30 07:03:44 C 05 47 56.56 -22 18 18.9 r 448
2005-11-30 12:37:39 C 05 47 27.74 -22 23 21.8 r E12
2005-11-30 12:44:41 C 05 47 27.06 -22 23 29.3 r E12
2005-11-30 12:51:45 C 05 47 26.37 -22 23 36.6 r E12
2005-11-30 17:30:27 C 05 46 59.15 -22 28 17.6 r E12
2005-11-30 17:34:48 C 05 46 58.73 -22 28 22.0 r E12
2005-11-30 17:42:50 C 05 46 57.98 -22 28 30.2 r E12
2005-12-01 12:03:14 C 05 45 18.49 -22 47 16.3 F65
2005-12-01 12:04:34 C 05 45 18.36 -22 47 17.8 F65
2005-12-01 12:05:55 C 05 45 18.22 -22 47 19.0 F65
2005-12-01 12:07:20 C 05 45 18.07 -22 47 20.6 F65
2005-12-02 06:59:55 C 05 43 31.68 -23 05 49.4 r 715
2005-12-02 07:08:49 C 05 43 30.71 -23 05 58.5 r 715
2005-12-02 07:17:44 C 05 43 29.77 -23 06 07.6 r 715
2005-12-02 07:26:38 C 05 43 28.85 -23 06 16.0 r 715
2005-12-06 06:38:49 C 05 33 24.96 -24 32 17.3 r 448
2005-12-06 06:47:19 C 05 33 23.87 -24 32 24.4 r 448
2005-12-06 06:55:48 C 05 33 22.81 -24 32 31.8 r 448
2005-12-07 11:46:59 C 05 29 58.46 -24 55 54.2 c F65
2005-12-07 11:48:14 C 05 29 58.26 -24 55 54.3 c F65
2005-12-07 11:49:30 C 05 29 58.10 -24 55 55.3 c F65
2005-12-10 07:34:06 C 05 21 25.98 -25 45 26.0 o 699
2005-12-10 07:57:46 C 05 21 22.55 -25 45 41.3 o 699
2005-12-10 08:21:28 C 05 21 19.18 -25 45 57.4 o 699
2005-12-10 09:13:03 C 05 21 11.82 -25 46 30.4 o 699
2005-12-17 10:19:27 C 04 56 33.65 -27 06 57.0 r E17
2005-12-17 10:23:32 C 04 56 33.02 -27 06 58.8 r E17
2005-12-17 10:27:37 C 04 56 32.33 -27 06 59.6 r E17
2005-12-24 12:21:34 C 04 28 03.72 -27 14 43.4 r 413
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)