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
2017-04-21 14:48:52 C 20 49 19.37 -44 56 42.7 t 474
2017-04-24 18:41:59 S 21 03 57.23 -46 44 41.7 L C51
2017-04-24 18:42:09 S 21 03 57.14 -46 44 41.5 L C51
2017-04-24 21:50:40 S 21 04 33.90 -46 49 01.4 L C51
2017-04-25 00:59:21 S 21 05 10.48 -46 53 20.6 L C51
2017-04-25 13:33:43 S 21 07 37.11 -47 10 31.0 L C51
2017-04-25 15:16:50 C 21 07 57.94 -47 12 49.1 t 474
2017-04-25 15:19:53 C 21 07 58.52 -47 12 53.2 t 474
2017-04-25 15:22:55 C 21 07 59.11 -47 12 57.3 t 474
2017-04-25 16:42:13 S 21 08 13.88 -47 14 48.7 L C51
2017-04-25 19:50:54 S 21 08 50.34 -47 19 03.5 L C51
2017-04-25 21:25:09 S 21 09 08.95 -47 21 12.0 L C51
2017-04-25 22:59:25 S 21 09 27.33 -47 23 18.2 L C51
2017-04-26 00:33:51 S 21 09 45.60 -47 25 25.2 L C51
2017-04-26 02:08:06 S 21 10 04.16 -47 27 32.7 L C51
2017-04-26 03:42:21 S 21 10 22.46 -47 29 38.9 L C51
2017-04-26 05:16:35 S 21 10 40.65 -47 31 44.9 L C51
2017-04-26 06:51:02 S 21 10 59.213 -47 33 52.88 L C51
2017-04-26 11:33:47 S 21 11 54.41 -47 40 13.4 L C51
2017-04-26 11:33:57 S 21 11 54.38 -47 40 11.9 L C51
2017-04-26 16:16:43 S 21 12 49.52 -47 46 28.4 L C51
2017-04-26 22:33:54 S 21 14 03.21 -47 54 48.8 L C51
2017-04-27 01:42:35 S 21 14 39.97 -47 58 58.3 L C51
2017-04-27 04:51:05 S 21 15 16.80 -48 03 07.5 L C51
2017-04-27 04:51:16 S 21 15 16.79 -48 03 07.6 L C51
2017-05-23 16:21:40 C 23 16 06.23 -58 34 43.2 U 474
2017-05-23 16:24:43 C 23 16 06.74 -58 34 45.5 U 474
2017-05-23 16:27:45 C 23 16 07.26 -58 34 47.7 U 474
2017-05-23 16:30:48 C 23 16 07.77 -58 34 50.0 U 474
2017-06-01 09:56:14 C 23 50 22.83 -60 58 20.4 q W88
2017-06-01 10:01:52 C 23 50 23.66 -60 58 24.6 q W88
2017-06-04 08:58:49 C 00 00 57.19 -61 43 20.8 q W88
2017-06-04 09:09:07 C 00 00 58.54 -61 43 27.3 q W88
2017-08-20 08:32:28 C 23 01 41.40 -75 11 42.9 u 807
2017-08-20 08:37:32 C 23 01 40.42 -75 11 41.0 u 807
2017-08-20 08:42:34 C 23 01 39.34 -75 11 39.4 u 807
2017-09-23 03:19:38 C 21 35 16.11 -65 14 39.0 u 807
2017-09-23 03:26:08 C 21 35 15.90 -65 14 32.5 u 807
2017-09-23 03:32:10 C 21 35 15.72 -65 14 26.5 u 807
2017-09-24 04:02:48 C 21 34 44.03 -64 50 53.1 u 807
2017-09-24 04:07:41 C 21 34 43.93 -64 50 48.5 u 807
2017-09-24 04:12:33 C 21 34 43.84 -64 50 43.9 u 807
2017-10-24 00:51:50 C 21 43 24.62 -53 15 10.9 U 807
2017-10-24 01:01:20 C 21 43 24.95 -53 15 02.1 U 807
2017-10-24 01:10:51 C 21 43 25.24 -53 14 53.0 U 807
2017-11-16 00:57:10 C 22 06 00.20 -44 55 01.2 U 807
2017-11-16 01:13:05 C 22 06 00.90 -44 54 47.0 U 807
2017-11-16 01:29:03 C 22 06 01.64 -44 54 33.2 U 807
2018-09-17 09:20:56 C 03 01 49.44 +07 22 31.8 o 291
2018-09-17 09:42:31 C 03 01 48.94 +07 22 32.1 o 291