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
2013-09-02 05:34:11 C 22 22 02.54 -44 57 45.6 r Y00
2013-09-02 05:41:28 C 22 22 01.82 -44 57 45.9 r Y00
2013-09-09 04:14:34 C 22 12 37.35 -44 56 57.6 r Y00
2013-09-09 04:28:18 C 22 12 36.55 -44 56 53.7 r Y00
2013-09-09 04:42:21 C 22 12 35.75 -44 56 49.2 r Y00
2013-09-13 03:21:12 C 22 09 48.60 -44 34 29.5 r Y00
2013-09-13 03:34:01 C 22 09 48.10 -44 34 24.6 r Y00
2013-09-13 03:47:54 C 22 09 47.58 -44 34 19.3 r Y00
2013-09-15 02:17:57 C 22 08 58.25 -44 19 21.8 r Y00
2013-09-15 02:28:59 C 22 08 57.94 -44 19 17.6 r Y00
2013-09-15 02:43:58 C 22 08 57.48 -44 19 11.3 r Y00
2014-08-12 20:03:59 C 14 57 36.65 -10 50 42.8 q 160
2014-08-12 20:06:17 C 14 57 38.00 -10 51 00.8 q 160
2014-08-12 20:08:31 C 14 57 39.34 -10 51 19.7 q 160
2014-08-12 20:10:45 C 14 57 40.63 -10 51 38.9 q 160
2014-08-14 19:05:58 S 15 26 04.80 -17 18 33.5 L C51
2014-08-14 22:15:23 S 15 28 00.21 -17 43 35.6 L C51
2014-08-14 23:50:00 S 15 28 57.90 -17 56 01.8 L C51
2015-08-29 01:06:15 S 16 38 41.458 -28 36 26.78 L C51
2015-08-29 04:15:07 S 16 39 46.901 -28 44 15.68 L C51
2015-08-29 07:24:10 S 16 40 52.262 -28 52 00.30 L C51
2015-08-29 12:07:28 S 16 42 29.935 -29 03 30.56 L C51
2015-08-29 18:25:12 S 16 44 40.010 -29 18 34.88 L C51
2015-08-30 03:51:48 S 16 47 54.341 -29 40 42.60 L C51
2015-08-30 03:51:59 S 16 47 54.235 -29 40 42.53 L C51
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)