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
2013-08-10 00:13:16 C 01 39 39.33 +07 42 11.9 13.7 u 089
2013-08-10 00:15:47 C 01 39 36.16 +07 41 03.8 13.8 u 089
2013-08-10 00:30:21 C 01 39 17.75 +07 34 29.3 13.3 u 089
2013-08-10 01:10:36 C 01 38 26.89 +07 16 21.5 13.3 u 089
2013-08-10 01:13:07 C 01 38 23.68 +07 15 13.2 13.3 u 089
2013-08-10 01:15:39 C 01 38 20.48 +07 14 04.4 13.5 u 089
2013-08-11 02:02:55 C 01 11 04.41 -03 18 56.4 q D03
2013-08-12 02:06:19 C 00 48 18.03 -11 55 32.3 q C95
2013-08-12 02:12:46 C 00 48 11.91 -11 57 36.5 q C95
2013-08-12 02:19:14 C 00 48 05.78 -11 59 41.0 q C95
2013-08-12 02:25:41 C 00 47 59.67 -12 01 45.0 q C95
2013-08-12 03:32:14 C 00 47 14.26 -12 16 56.3 r Y00
2013-08-12 03:32:39 C 00 47 13.84 -12 17 04.7 r Y00
2013-08-12 03:33:05 C 00 47 13.45 -12 17 12.8 r Y00
2013-08-13 02:52:16 C 00 28 28.82 -18 52 45.3 r Y00
2013-08-13 02:52:41 C 00 28 28.49 -18 52 51.8 r Y00
2013-08-13 02:53:06 C 00 28 28.15 -18 52 58.1 r Y00
2013-08-14 01:51:20 C 00 12 36.65 -23 58 49.0 r Y00
2013-08-14 01:51:54 C 00 12 36.24 -23 58 56.1 r Y00
2013-08-14 01:52:28 C 00 12 35.84 -23 59 03.4 r Y00
2013-08-16 00:43:06 C 23 46 34.79 -31 14 37.1 r Y00
2013-08-16 00:43:51 C 23 46 34.31 -31 14 43.8 r Y00
2013-08-16 00:44:35 C 23 46 33.90 -31 14 49.2 r Y00
2013-08-18 05:31:55 C 23 24 32.758 -36 15 43.45 o 844
2013-08-18 05:37:26 C 23 24 30.497 -36 16 07.58 o 844
2013-08-20 03:27:13 C 23 10 09.46 -39 04 11.5 r Y00
2013-08-20 03:28:35 C 23 10 08.97 -39 04 16.0 r Y00
2013-08-20 03:29:56 C 23 10 08.47 -39 04 20.7 r Y00
2013-08-22 05:58:42 C 22 57 39.28 -41 10 24.4 i G41
2013-08-22 06:13:39 C 22 57 35.43 -41 10 55.7 i G41
2013-08-22 06:28:33 C 22 57 31.56 -41 11 26.8 i G41
2013-08-22 06:29:45 C 22 57 22.31 -41 09 55.4 r Y00
2013-08-22 06:31:33 C 22 57 21.88 -41 09 58.5 r Y00
2013-08-22 06:33:21 C 22 57 21.45 -41 10 01.9 r Y00
2013-08-24 07:40:24 C 22 47 39.01 -42 32 33.2 r Y00
2013-08-24 07:42:42 C 22 47 38.55 -42 32 35.5 r Y00
2013-08-24 07:44:59 C 22 47 38.10 -42 32 38.2 r Y00
2013-08-25 06:56:35 C 22 43 44.41 -43 02 39.7 r Y00
2013-08-25 06:59:12 C 22 43 43.86 -43 02 42.3 r Y00
2013-08-25 07:01:48 C 22 43 43.44 -43 02 44.5 r Y00
2013-08-27 06:42:08 C 22 36 44.71 -43 50 07.3 r Y00
2013-08-27 06:46:01 C 22 36 44.13 -43 50 09.3 r Y00
2013-08-27 06:49:31 C 22 36 43.57 -43 50 11.5 r Y00
2013-08-29 06:04:42 C 22 30 58.87 -44 22 47.6 r Y00
2013-08-29 06:10:16 C 22 30 58.06 -44 22 49.3 r Y00
2013-08-29 06:14:04 C 22 30 57.42 -44 22 51.3 r Y00
2013-08-30 05:17:21 C 22 28 31.23 -44 34 42.9 r Y00
2013-08-30 05:24:34 C 22 28 30.23 -44 34 45.3 r Y00
2013-08-30 05:30:28 C 22 28 29.60 -44 34 47.4 r Y00
2013-09-02 05:26:58 C 22 22 03.24 -44 57 45.3 r Y00
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)