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
2008-10-10 09:51:19 C 04 07 31.98 -14 28 53.4 r 703
2008-10-10 10:02:40 C 04 07 31.51 -14 29 08.6 r 703
2008-10-10 10:14:03 C 04 07 30.82 -14 29 25.3 r 703
2008-10-10 10:25:20 C 04 07 30.32 -14 29 40.0 r 703
2008-10-24 05:02:11 C 03 44 52.10 -21 22 35.8 r 304
2008-10-24 05:05:59 C 03 44 51.72 -21 22 40.0 r 304
2008-10-24 05:09:05 C 03 44 51.44 -21 22 43.6 r 304
2008-10-24 05:12:13 C 03 44 51.08 -21 22 47.1 r 304
2008-10-24 05:15:19 C 03 44 50.77 -21 22 50.8 r 304
2008-10-24 05:18:24 C 03 44 50.48 -21 22 54.0 r 304
2008-10-24 05:21:32 C 03 44 50.17 -21 22 57.5 r 304
2008-10-24 05:24:38 C 03 44 49.85 -21 23 01.0 r 304
2008-10-24 05:27:49 C 03 44 49.56 -21 23 04.9 r 304
2008-10-24 05:30:59 C 03 44 49.19 -21 23 08.6 r 304
2009-01-16 04:01:04 C 02 01 59.498 -05 47 53.66 645
2009-01-16 04:02:16 C 02 01 59.549 -05 47 52.19 645
2009-01-16 04:05:51 C 02 01 59.683 -05 47 48.01 645
2009-10-02 14:02:26 C 03 29 55.34 -16 41 23.2 o F65
2009-10-02 14:06:20 C 03 29 55.09 -16 41 28.9 o F65
2009-10-02 14:08:15 C 03 29 54.99 -16 41 31.6 o F65
2009-10-18 14:56:45 C 02 57 01.06 -24 57 56.9 r E12
2009-10-20 15:54:56 C 02 51 30.33 -25 45 37.2 r E12
2009-10-20 16:26:36 C 02 51 26.48 -25 46 05.9 r E12
2010-08-01 07:11:39 S 02 38 31.08 +10 14 52.5 L C51
2010-08-01 10:22:09 S 02 38 42.91 +10 11 51.0 L C51
2010-08-01 13:32:30 S 02 38 55.02 +10 08 44.3 L C51
2010-08-01 13:32:40 S 02 38 55.11 +10 08 46.8 L C51
2010-08-01 16:43:12 S 02 39 07.02 +10 05 44.6 L C51
2010-08-01 21:28:53 S 02 39 24.71 +10 01 13.0 L C51
2010-08-01 23:04:14 S 02 39 30.75 +09 59 40.0 L C51
2010-08-02 00:39:23 S 02 39 36.49 +09 58 06.4 L C51
2010-08-05 00:06:08 S 02 43 56.998 +08 48 33.73 L C51
2010-08-05 01:41:18 S 02 44 02.671 +08 47 00.71 L C51
2010-08-05 01:41:29 S 02 44 02.556 +08 46 58.37 L C51
2010-08-05 03:16:39 S 02 44 08.177 +08 45 23.65 L C51
2010-08-05 04:51:49 S 02 44 13.838 +08 43 48.97 L C51
2010-08-05 04:52:00 S 02 44 13.836 +08 43 51.71 L C51
2010-08-05 06:27:10 S 02 44 19.423 +08 42 15.88 L C51
2010-08-05 11:13:02 S 02 44 36.331 +08 37 31.12 L C51
2010-08-05 14:23:33 S 02 44 47.462 +08 34 20.46 L C51
2010-08-05 17:34:04 S 02 44 58.421 +08 31 10.67 L C51
2010-09-23 07:15:26 C 02 52 52.77 -18 46 08.3 o H21
2010-09-23 07:20:20 C 02 52 52.36 -18 46 15.4 o H21
2010-09-23 07:25:38 C 02 52 51.90 -18 46 23.8 o H21
2010-09-25 07:32:46 C 02 49 19.59 -20 04 47.6 o H21
2010-09-25 07:41:14 C 02 49 18.91 -20 05 01.2 o H21
2010-09-25 07:45:28 C 02 49 18.58 -20 05 08.5 o H21
2010-09-25 07:49:30 C 02 49 18.24 -20 05 15.7 o H21
2010-09-27 08:08:27 C 02 45 23.12 -21 21 59.7 o H21
2010-09-27 08:17:53 C 02 45 22.24 -21 22 14.4 o H21
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)