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
2012-10-22 12:56:59 C 03 14 28.939 +21 21 08.81 V F51
2012-10-22 13:17:58 C 03 14 27.825 +21 21 11.13 V F51
2012-10-22 13:38:45 C 03 14 26.717 +21 21 13.45 V F51
2012-10-22 13:59:36 C 03 14 25.605 +21 21 15.82 V F51
2012-11-05 12:03:14 C 02 55 23.579 +21 51 46.23 V F51
2012-11-05 12:22:53 C 02 55 22.343 +21 51 47.47 V F51
2012-11-12 07:38:55 C 02 45 26.573 +22 00 00.60 V F51
2012-12-29 06:38:54 C 01 57 42.577 +22 18 15.36 V F51
2012-12-29 06:57:04 C 01 57 42.306 +22 18 16.34 V F51
2015-10-10 13:59:29 C 03 04 06.083 +14 05 13.34 V F51
2015-10-10 14:16:46 C 03 04 05.362 +14 05 14.63 V F51
2015-10-10 14:34:01 C 03 04 04.572 +14 05 15.21 V F51
2015-10-10 14:51:15 C 03 04 03.818 +14 05 16.67 V F51
2015-11-03 07:39:49 C 02 34 39.40 +14 29 12.1 q G96
2015-11-03 07:47:07 C 02 34 38.98 +14 29 12.3 q G96
2015-11-03 07:54:24 C 02 34 38.58 +14 29 12.2 q G96
2015-11-18 07:05:21 C 02 14 40.162 +14 36 13.23 V F51
2015-12-03 05:46:20 C 01 57 57.396 +14 47 01.08 V F51
2015-12-03 06:04:25 C 01 57 56.691 +14 47 01.80 V F51
2015-12-04 06:02:12 C 01 57 00.593 +14 48 07.72 V F51
2015-12-04 06:17:30 C 01 57 00.016 +14 48 08.31 V F51
2015-12-04 06:32:42 C 01 56 59.394 +14 48 09.12 V F51
2015-12-04 06:48:03 C 01 56 58.782 +14 48 10.00 V F51
2015-12-14 07:55:01 C 01 49 04.424 +15 03 02.57 V F51
2015-12-14 08:14:18 C 01 49 03.917 +15 03 04.42 V F51
2015-12-14 08:52:45 C 01 49 02.850 +15 03 08.14 V F51
2017-04-17 01:14:32 S 20 28 32.825 -42 10 18.23 L C51
2017-04-18 07:06:13 S 20 34 09.233 -42 56 52.91 L C51
2017-04-18 11:49:09 S 20 35 02.68 -43 04 09.5 L C51
2017-04-18 13:23:25 S 20 35 20.24 -43 06 33.2 L C51
2017-04-18 16:32:06 S 20 35 55.94 -43 11 25.1 L C51
2017-04-18 18:06:21 S 20 36 13.81 -43 13 49.2 L C51
2017-04-18 19:40:35 S 20 36 31.58 -43 16 10.2 L C51
2017-04-18 21:15:02 S 20 36 49.46 -43 18 38.9 L C51
2017-04-18 22:49:16 S 20 37 07.33 -43 21 03.0 L C51
2017-04-20 15:06:16 C 20 44 47.21 -44 21 44.5 t 474
2017-04-20 15:08:48 C 20 44 47.68 -44 21 48.4 t 474
2017-04-20 15:11:20 C 20 44 48.18 -44 21 52.3 t 474
2017-04-20 15:13:52 C 20 44 48.66 -44 21 56.1 t 474
2017-04-21 01:03:41 C 20 46 41.47 -44 36 31.8 U K92
2017-04-21 01:10:24 C 20 46 42.74 -44 36 42.1 U K92
2017-04-21 01:15:25 C 20 46 43.68 -44 36 49.6 U K92
2017-04-21 01:47:33 C 20 46 49.76 -44 37 37.8 U K93
2017-04-21 01:54:16 C 20 46 51.02 -44 37 47.9 U K93
2017-04-21 01:59:18 C 20 46 51.97 -44 37 55.5 U K93
2017-04-21 07:33:17 C 20 47 55.97 -44 46 07.1 u 807
2017-04-21 07:41:27 C 20 47 57.53 -44 46 19.4 u 807
2017-04-21 14:41:15 C 20 49 17.91 -44 56 31.4 t 474
2017-04-21 14:43:48 C 20 49 18.38 -44 56 35.2 t 474
2017-04-21 14:46:20 C 20 49 18.88 -44 56 39.0 t 474