539940 (2017 HW1)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.4585305393 ± 1.85e-08
Semi-major axis (a)2.1379494101 AU ± 2.27e-08
Inclination (i)33.93429844° ± 5.61e-06
Long. of Asc. Node (Ω)41.31082257° ± 2.15e-06
Arg. of Perihelion (ω)168.80631156° ± 8.78e-06
Mean Anomaly (M)282.85413711° ± 1.06e-05
Mean Motion (n)0.3152943146°/day ± 5.02e-09
Perihelion dist (q)1.15763431 AU ± 4.14e-08
Aphelion dist (Q)3.11826451 AU ± 5.16e-08
Orbital Period3.12605156 yr ± 4.97e-08
Physical Parameters
H (abs. magnitude)18.00
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-06-02
RMS Residual0.518″
Uncertainty0
Orbit TypeAmor
MOID0.155744 AU
Observations Used1400
Oppositions9
Arc Total2012-2025
First Observation Used2012-10-22
Last Observation Used2025-12-13
Observations (2295)
Date Type RA Dec Mag Band Observatory
2020-04-11 15:44:18 s 1 -172110.91 9 +313406.07 9190.0 C57
2020-04-11 16:14:18 S 15 22 50.510 +47 30 50.36 V C57
2020-04-11 16:14:18 s 1 -172843.15 4 +312216.37 8790.0 C57
2020-04-11 16:44:18 S 15 22 44.988 +47 29 53.23 V C57
2020-04-11 16:44:18 s 1 -173570.44 2 +311017.83 4950.0 C57
2020-04-11 17:14:18 S 15 22 39.833 +47 29 01.10 V C57
2020-04-11 17:14:18 s 1 -174292.73 4 +309810.43 7640.0 C57
2020-04-11 17:44:18 S 15 22 34.394 +47 28 06.96 V C57
2020-04-11 17:44:18 s 1 -175009.98 2 +308594.15 6810.0 C57
2020-04-11 18:14:18 S 15 22 28.764 +47 27 09.22 V C57
2020-04-11 18:14:18 s 1 -175722.13 5 +307368.98 2400.0 C57
2020-04-11 18:44:18 S 15 22 23.458 +47 26 15.90 V C57
2020-04-11 18:44:18 s 1 -176429.14 3 +306134.90 4370.0 C57
2020-04-11 19:14:18 S 15 22 18.132 +47 25 21.83 V C57
2020-04-11 19:14:18 s 1 -177130.95 5 +304891.89 2670.0 C57
2020-04-11 19:44:18 S 15 22 12.461 +47 24 24.77 V C57
2020-04-11 19:44:18 s 1 -177827.52 0 +303639.94 7250.0 C57
2020-04-11 20:14:18 S 15 22 06.917 +47 23 28.36 V C57
2020-04-11 20:14:18 s 1 -178518.78 5 +302379.01 8060.0 C57
2020-04-11 20:44:18 S 15 22 01.668 +47 22 35.04 V C57
2020-04-11 20:44:18 s 1 -179204.69 7 +301109.10 5060.0 C57
2020-04-11 21:14:18 S 15 21 56.042 +47 21 36.97 V C57
2020-04-11 21:14:18 s 1 -179885.20 3 +299830.19 8180.0 C57
2020-04-11 21:44:18 S 15 21 50.482 +47 20 42.11 V C57
2020-04-11 21:44:18 s 1 -180560.24 8 +298542.25 7380.0 C57
2020-04-11 21:51:23 C 15 19 13.37 +47 26 26.2 q 557
2020-04-11 22:14:18 S 15 21 44.798 +47 19 45.98 V C57
2020-04-11 22:14:18 s 1 -181229.77 8 +297245.27 2610.0 C57
2020-04-11 22:43:14 C 15 19 03.90 +47 24 40.7 V L40
2020-04-11 22:44:18 S 15 21 39.521 +47 18 48.78 V C57
2020-04-11 22:44:18 s 1 -181893.73 7 +295939.23 3820.0 C57
2020-04-11 22:52:14 C 15 19 02.21 +47 24 22.8 V L40
2020-04-11 22:54:08 C 15 19 01.59 +47 24 19.8 q 557
2020-04-11 23:14:18 S 15 21 34.258 +47 17 57.88 V C57
2020-04-11 23:14:18 s 1 -182552.06 9 +294624.10 940.0 C57
2020-04-11 23:44:18 S 15 21 28.250 +47 16 56.32 V C57
2020-04-11 23:44:18 s 1 -183204.71 6 +293299.88 3930.0 C57
2020-04-11 23:56:53 C 15 18 49.71 +47 22 11.9 q 557
2020-04-12 00:14:18 S 15 21 22.538 +47 16 01.27 V C57
2020-04-12 00:14:18 s 1 -183851.62 1 +291966.53 2740.0 C57
2020-04-12 00:44:18 S 15 21 17.155 +47 15 03.46 V C57
2020-04-12 00:44:18 s 1 -184492.72 6 +290624.03 7290.0 C57
2020-04-12 00:59:41 C 15 18 37.75 +47 20 02.4 q 557
2020-04-12 01:14:18 S 15 21 11.674 +47 14 07.98 V C57
2020-04-12 01:14:18 s 1 -185127.97 1 +289272.38 7550.0 C57
2020-04-12 01:44:18 S 15 21 06.214 +47 13 12.86 V C57
2020-04-12 01:44:18 s 1 -185757.29 5 +287911.54 3460.0 C57
2020-04-12 02:02:25 C 15 18 25.79 +47 17 51.2 q 557
2020-04-12 02:14:18 S 15 21 00.228 +47 12 16.42 V C57
2020-04-12 02:14:18 s 1 -186380.63 9 +286541.50 4940.0 C57