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
2005-12-24 12:22:18 C 04 28 03.54 -27 14 43.3 r 413
2005-12-24 12:23:00 C 04 28 03.41 -27 14 42.8 r 413
2005-12-24 13:03:25 C 04 27 55.54 -27 14 36.4 r 428
2005-12-27 13:51:56 C 04 15 04.57 -26 51 48.0 r E12
2005-12-27 14:04:51 C 04 15 02.16 -26 51 41.7 r E12
2005-12-27 14:17:46 C 04 14 59.67 -26 51 35.8 r E12
2005-12-27 14:30:46 C 04 14 57.26 -26 51 29.8 r E12
2006-01-07 01:30:20 C 03 30 41.30 -23 32 46.6 r 734
2006-01-07 01:36:41 C 03 30 40.03 -23 32 40.6 r 734
2006-01-07 01:43:02 C 03 30 38.87 -23 32 33.1 r 734
2006-01-07 03:02:38 C 03 30 25.00 -23 31 00.9 o 699
2006-01-07 03:28:57 C 03 30 20.08 -23 30 30.3 o 699
2006-01-07 03:55:16 C 03 30 15.24 -23 30 00.5 o 699
2006-01-07 04:21:35 C 03 30 10.31 -23 29 29.9 o 699
2006-01-24 02:07:17 C 02 22 55.49 -12 46 52.9 d 291
2006-01-24 02:13:19 C 02 22 54.47 -12 46 42.6 d 291
2006-01-24 02:19:22 C 02 22 53.39 -12 46 30.8 d 291
2006-08-18 11:25:34 C 03 53 56.77 +08 34 25.6 d 291
2006-08-18 11:31:00 C 03 53 57.28 +08 34 24.3 d 291
2006-08-18 11:36:29 C 03 53 57.74 +08 34 22.6 d 291
2006-09-24 11:41:07 C 05 04 00.42 +00 59 57.5 d 291
2006-09-24 11:46:48 C 05 04 00.72 +00 59 53.4 d 291
2006-09-24 11:54:19 C 05 04 01.12 +00 59 47.9 d 291
2006-11-01 10:16:46 C 05 22 45.91 -13 57 27.0 r 703
2006-11-01 10:25:25 C 05 22 45.51 -13 57 37.5 r 703
2006-11-01 10:33:53 C 05 22 45.12 -13 57 48.4 r 703
2006-11-01 10:42:24 C 05 22 44.90 -13 57 57.8 r 703
2006-11-07 10:38:22 C 05 16 39.36 -16 43 13.7 r F84
2006-11-07 11:17:47 C 05 16 36.96 -16 43 58.9 r F84
2006-11-25 07:32:08 C 04 38 31.59 -23 33 45.2 r 703
2006-11-25 07:43:12 C 04 38 30.04 -23 33 51.9 r 703
2006-11-25 07:54:12 C 04 38 28.75 -23 33 58.2 r 703
2006-11-25 08:05:13 C 04 38 27.31 -23 34 06.2 r 703
2007-10-04 08:36:46 C 04 47 16.50 -05 55 08.2 o H55
2007-10-04 08:43:23 C 04 47 16.57 -05 55 15.3 o H55
2007-10-04 08:50:24 C 04 47 16.66 -05 55 22.9 o H55
2007-11-04 14:05:01 C 04 21 58.24 -20 26 41.9 r E12
2007-11-04 14:17:30 C 04 21 57.06 -20 26 54.8 r E12
2007-11-04 14:30:18 C 04 21 55.83 -20 27 07.6 r E12
2007-11-04 14:43:44 C 04 21 54.46 -20 27 21.4 r E12
2008-01-03 02:04:31 C 02 15 19.80 -13 54 35.9 r 703
2008-01-03 02:13:10 C 02 15 19.69 -13 54 26.7 r 703
2008-01-03 02:21:46 C 02 15 19.47 -13 54 15.3 r 703
2008-01-03 02:30:23 C 02 15 19.15 -13 54 04.3 r 703
2008-01-09 05:07:37 C 02 14 10.71 -10 56 16.9 c 568
2008-01-09 05:29:46 C 02 14 10.56 -10 55 49.1 c 568
2008-01-09 05:40:49 C 02 14 10.46 -10 55 35.9 c 568
2008-01-09 05:51:51 C 02 14 10.38 -10 55 22.3 c 568
2008-01-09 06:04:56 C 02 14 10.28 -10 55 06.1 c 568
2008-09-18 08:06:09 C 04 10 44.70 -03 41 18.8 o H55
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)