488474 (1999 HD1)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.4179191902 ± 1.47e-07
Semi-major axis (a)1.1318781918 AU ± 4.25e-09
Inclination (i)18.21466714° ± 1.45e-05
Long. of Asc. Node (Ω)209.85119632° ± 1.31e-05
Arg. of Perihelion (ω)147.97798299° ± 2.28e-05
Mean Anomaly (M)285.35280547° ± 3.03e-05
Mean Motion (n)0.8184887937°/day ± 4.61e-09
Perihelion dist (q)0.65884457 AU ± 1.66e-07
Aphelion dist (Q)1.60491181 AU ± 1.66e-07
Orbital Period1.20420254 yr ± 6.78e-09
Physical Parameters
H (abs. magnitude)20.32
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.386″
Uncertainty0
Orbit TypeApollo
MOID0.216594 AU
Observations Used102
Oppositions4
Arc Total1999-2024
First Observation Used1999-04-16
Last Observation Used2024-03-17
Observations (105)
Date Type RA Dec Mag Band Observatory
2005-06-04 05:43:41 C 12 28 39.61 +18 43 56.7 n 645
2005-06-04 05:44:52 C 12 28 39.57 +18 43 57.6 n 645
2005-06-04 05:48:17 C 12 28 39.471 +18 44 01.40 21.7 e 645
2005-06-04 05:48:27 C 12 28 39.47 +18 44 01.3 n 645
2005-07-03 05:01:05 C 12 27 34.90 +26 42 35.3 d 291
2005-07-03 05:13:18 C 12 27 35.00 +26 42 42.1 d 291
2007-02-09 02:30:17 C 03 41 44.08 -17 37 10.0 o 291
2007-02-09 02:39:46 C 03 41 45.74 -17 36 57.9 o 291
2007-02-09 02:45:23 C 03 41 46.72 -17 36 52.4 o 291
2011-04-28 05:10:23 C 12 59 43.86 -05 24 35.9 o 691
2011-04-28 06:12:50 C 12 59 37.56 -05 22 41.7 o 691
2011-04-30 03:39:24 C 12 55 19.65 -03 59 39.8 o 691
2011-04-30 04:06:02 C 12 55 17.06 -03 58 51.1 o 691
2011-04-30 04:32:43 C 12 55 14.45 -03 58 02.7 o 691
2011-05-04 03:55:20 C 12 46 41.04 -01 06 58.6 o 691
2011-05-04 04:25:52 C 12 46 38.29 -01 06 03.2 o 691
2017-03-27 12:11:44 C 13 36 46.927 -23 06 05.06 L F51
2017-03-27 12:26:05 C 13 36 45.823 -23 05 51.92 L F51
2017-03-27 12:40:32 C 13 36 44.705 -23 05 38.73 L F51
2017-03-27 12:54:55 C 13 36 43.610 -23 05 25.67 L F51
2017-04-06 07:40:08 C 13 17 11.21 -18 43 26.2 q G96
2017-04-06 07:46:13 C 13 17 10.65 -18 43 17.5 q G96
2017-04-06 07:52:22 C 13 17 10.08 -18 43 10.2 q G96
2017-04-06 07:58:28 C 13 17 09.45 -18 43 01.6 q G96
2017-04-28 08:52:56 C 12 28 06.024 -04 42 23.23 L F51
2017-04-28 09:10:27 C 12 28 04.540 -04 41 54.42 L F51
2017-05-02 04:08:36 C 12 21 12.90 -02 15 19.9 q G96
2017-05-02 04:14:42 C 12 21 12.40 -02 15 10.0 q G96
2017-05-02 04:20:48 C 12 21 12.00 -02 15 00.4 q G96
2017-05-02 04:26:55 C 12 21 11.51 -02 14 50.9 q G96
2017-05-15 03:32:43 C 12 04 36.25 +04 55 53.5 q G96
2017-05-15 03:38:53 C 12 04 35.98 +04 56 00.8 q G96
2017-05-15 03:45:04 C 12 04 35.77 +04 56 08.2 q G96
2017-05-15 03:51:14 C 12 04 35.52 +04 56 15.2 q G96
2022-05-11 10:50:04 C 22 01 13.350 +16 39 01.30 V I52
2022-05-11 11:01:19 C 22 01 16.280 +16 39 26.10 V I52
2022-05-11 11:12:38 C 22 01 19.270 +16 39 51.30 V I52
2022-05-11 11:18:09 C 22 01 20.700 +16 40 03.00 V I52
2023-03-26 10:45:32 C 13 12 09.876 -23 15 47.12 U F51
2023-03-26 11:01:14 C 13 12 08.550 -23 15 32.43 U F51
2023-03-26 11:32:40 C 13 12 05.888 -23 15 02.69 U F51
2023-04-19 06:22:04 C 12 20 22.992 -10 23 20.80 V G96
2023-04-19 06:29:31 C 12 20 22.326 -10 23 09.13 V G96
2023-04-19 06:36:59 C 12 20 21.660 -10 22 57.00 V G96
2023-04-19 06:44:28 C 12 20 20.994 -10 22 45.23 V G96
2023-04-22 07:08:40 C 12 14 22.390 -08 27 26.76 U F52
2023-04-22 07:26:59 C 12 14 20.854 -08 26 57.73 U F52
2023-04-22 07:45:18 C 12 14 19.313 -08 26 28.78 U F52
2023-04-22 08:03:40 C 12 14 17.775 -08 25 59.70 U F52
2024-02-18 08:56:50 C 09 17 22.848 -29 51 56.78 X F52