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
2020-05-09 15:52:50 C 12 41 51.42 -18 46 33.0 V 186
2020-05-09 20:20:37 C 12 40 54.96 -19 17 18.5 q K73
2020-05-09 20:27:16 C 12 40 53.54 -19 18 04.2 q K73
2020-05-10 04:36:17 C 12 39 10.07 -20 12 31.8 q Y00
2020-05-10 04:38:49 C 12 39 09.49 -20 12 46.3 q Y00
2020-05-10 04:41:19 C 12 39 08.96 -20 13 04.0 q Y00
2020-05-10 10:10:47 C 12 38 02.77 -20 50 16.9 V T08
2020-05-10 10:24:42 C 12 37 59.79 -20 51 48.5 V T08
2020-05-10 10:39:19 C 12 37 56.70 -20 53 24.5 V T08
2020-05-11 14:09:41 C 12 32 30.864 -23 49 22.15 V O85
2020-05-11 14:10:25 C 12 32 30.721 -23 49 26.70 V O85
2020-05-11 14:11:10 C 12 32 30.566 -23 49 31.40 V O85
2020-05-11 14:15:21 C 12 32 29.691 -23 49 56.86 V O85
2020-05-11 14:16:05 C 12 32 29.552 -23 50 01.46 V O85
2020-05-11 14:16:49 C 12 32 29.407 -23 50 05.93 V O85
2020-05-11 14:21:45 C 12 32 28.382 -23 50 36.47 V O85
2020-05-11 14:22:29 C 12 32 28.229 -23 50 41.02 V O85
2020-05-11 14:28:08 C 12 32 27.070 -23 51 15.65 V O85
2020-05-11 14:28:53 C 12 32 26.914 -23 51 20.15 V O85
2020-05-11 14:29:37 C 12 32 26.768 -23 51 24.66 V O85
2020-05-11 14:34:32 C 12 32 25.759 -23 51 54.82 V O85
2020-05-11 14:35:16 C 12 32 25.606 -23 51 59.38 V O85
2020-05-12 09:05:06 C 12 28 52.73 -25 42 55.5 V T05
2020-05-12 09:27:41 C 12 28 48.21 -25 45 06.9 V T05
2020-05-12 09:37:38 C 12 28 46.21 -25 46 04.8 V T05
2020-05-13 02:14:56 C 12 25 41.36 -27 20 32.4 q Y00
2020-05-13 02:16:50 C 12 25 40.95 -27 20 42.6 q Y00
2020-05-13 02:18:51 C 12 25 40.64 -27 20 54.2 q Y00
2020-05-14 08:07:45 C 12 20 23.83 -30 00 40.0 V T08
2020-05-14 08:12:23 C 12 20 22.97 -30 01 03.5 V T08
2020-05-14 08:20:21 C 12 20 21.51 -30 01 43.8 V T08
2020-05-14 08:36:19 C 12 20 18.54 -30 03 05.0 V T08
2020-05-16 06:57:58 C 12 12 41.07 -33 44 10.0 V T05
2020-05-16 07:02:35 C 12 12 40.29 -33 44 30.5 V T05
2020-05-16 07:12:40 C 12 12 38.57 -33 45 15.3 V T05
2020-05-18 07:23:45 C 12 05 27.23 -37 04 16.6 V T08
2020-05-18 07:37:03 C 12 05 25.19 -37 05 07.3 V T08
2020-05-18 07:51:47 C 12 05 22.95 -37 06 03.6 V T08
2020-05-22 07:09:45 C 11 53 24.78 -42 23 44.8 V T08
2020-05-22 07:18:21 C 11 53 23.73 -42 24 09.8 V T08
2020-05-22 07:34:24 C 11 53 21.78 -42 24 55.7 V T08
2022-10-31 08:06:48 C 07 55 44.720 +52 21 44.71 V G96
2022-10-31 08:21:53 C 07 55 45.811 +52 21 55.98 V G96
2022-10-31 08:29:25 C 07 55 46.344 +52 22 01.96 V G96
2022-10-31 08:36:56 C 07 55 46.801 +52 22 07.72 V G96
2022-11-24 13:32:08 C 08 33 15.281 +60 49 55.48 U F52
2022-11-24 13:49:38 C 08 33 16.218 +60 50 12.91 U F52
2022-11-24 14:07:06 C 08 33 17.136 +60 50 30.85 U F52
2022-11-24 14:24:33 C 08 33 18.078 +60 50 48.12 U F52
2022-12-01 14:09:17 C 08 42 14.548 +63 44 04.77 U F52