1627 Ivar (1929 SH)

NEO ⇩ IMP ⇩ COV ★ EPH ⇩ OBS ⇩ Radar ⇩ Gaia
Orbital Elements
Epoch (TDB)2025-11-21 (JD 2461000.5)
Eccentricity (e)0.3973228500 ± 3.37e-09
Semi-major axis (a)1.8630580824 AU ± 4.99e-10
Inclination (i)8.45629236° ± 2.99e-07
Long. of Asc. Node (Ω)133.07459963° ± 2.39e-06
Arg. of Perihelion (ω)167.83961943° ± 2.63e-06
Mean Anomaly (M)311.46100560° ± 6.93e-07
Mean Motion (n)0.3875901077°/day ± 1.56e-10
Perihelion dist (q)1.12282254 AU ± 6.29e-09
Aphelion dist (Q)2.60329363 AU ± 6.32e-09
Orbital Period2.54296037 yr ± 1.02e-09
NGA Modelr2
A2-5.33141704e-16 ± 5.07e-16 AU/d²
Physical Parameters
H (abs. magnitude)12.79
G (slope)0.15
Orbit Solution
SourceIAA
Solution Date2026-05-31
RMS Residual0.120″
Uncertainty0
Orbit TypeAmor
MOID0.108765 AU
Observations Used13532
Radar Obs Used4
Gaia Obs Used222
Oppositions53
Arc Total1929-2025
First Observation Used1929-09-25
Last Observation Used2025-06-15
Observations (18178)
Date Type RA Dec Mag Band Observatory
2023-12-27 10:38:59 B 23 27 38.25 -12 29 15.2 q Q06
2023-12-27 10:44:07 B 23 27 38.83 -12 29 11.2 q Q06
2023-12-27 16:14:26 C 23 28 17.76 -12 24 52.4 X G02
2023-12-27 16:21:09 C 23 28 18.55 -12 24 48.3 X G02
2023-12-27 16:27:51 C 23 28 19.34 -12 24 42.5 X G02
2023-12-30 05:52:08 C 23 35 26.652 -11 36 35.68 V T05
2023-12-30 06:06:23 C 23 35 28.277 -11 36 24.41 V T05
2023-12-30 06:27:54 C 23 35 30.725 -11 36 07.60 V T05
2023-12-30 06:28:33 C 23 35 30.804 -11 36 07.56 V T05
2023-12-30 06:32:31 C 23 35 31.248 -11 36 03.92 V T05
2023-12-30 06:33:10 C 23 35 31.330 -11 36 03.89 V T05
2023-12-30 09:15:27 B 23 35 50.12 -11 33 57.9 q Q06
2023-12-30 09:19:18 B 23 35 50.56 -11 33 54.9 q Q06
2023-12-30 09:23:10 B 23 35 51.00 -11 33 51.9 q Q06
2024-01-01 06:32:01 C 23 40 59.844 -10 58 37.63 V T08
2024-01-01 06:38:28 C 23 41 00.581 -10 58 32.74 V T08
2024-01-01 06:46:41 C 23 41 01.502 -10 58 26.18 V T08
2024-01-01 07:02:15 C 23 41 03.247 -10 58 14.02 V T08
2024-01-01 09:42:20 B 23 41 21.44 -10 56 11.4 q Q06
2024-01-01 09:44:04 B 23 41 21.72 -10 56 09.6 q Q06
2024-01-01 09:45:48 B 23 41 22.00 -10 56 07.9 q Q06
2024-01-03 02:01:35 C 23 45 53.860 -10 24 51.23 V 703
2024-01-03 02:04:51 C 23 45 54.230 -10 24 48.38 V 703
2024-01-03 02:08:07 C 23 45 54.594 -10 24 45.94 V 703
2024-01-03 02:11:22 C 23 45 54.958 -10 24 43.56 V 703
2024-01-03 05:56:03 C 23 46 20.018 -10 21 48.24 V T05
2024-01-03 06:00:38 C 23 46 20.522 -10 21 44.64 V T05
2024-01-03 06:11:03 C 23 46 21.674 -10 21 36.58 V T05
2024-01-03 06:28:20 C 23 46 23.580 -10 21 23.11 V T05
2024-01-05 06:07:22 C 23 51 41.136 -09 44 32.17 V T08
2024-01-05 06:12:12 C 23 51 41.662 -09 44 28.39 V T08
2024-01-05 06:20:17 C 23 51 42.550 -09 44 22.20 V T08
2024-01-05 06:41:03 C 23 51 44.813 -09 44 06.07 V T08
2024-01-07 04:56:31 C 23 56 49.306 -09 08 31.31 V T05
2024-01-07 05:01:18 C 23 56 49.819 -09 08 27.49 V T05
2024-01-07 05:12:21 C 23 56 51.012 -09 08 18.96 V T05
2024-01-07 05:31:28 C 23 56 53.069 -09 08 04.38 V T05
2024-01-09 16:19:39 C 00 03 14.89 -08 23 10.4 X G02
2024-01-09 16:24:38 C 00 03 15.41 -08 23 05.8 X G02
2024-01-09 16:29:24 C 00 03 15.90 -08 23 02.4 X G02
2024-01-10 03:29:23 C 00 04 26.566 -08 14 37.97 V 703
2024-01-10 03:32:43 C 00 04 26.908 -08 14 35.34 V 703
2024-01-10 03:36:03 C 00 04 27.163 -08 14 33.97 V 703
2024-01-10 03:39:24 C 00 04 27.574 -08 14 31.34 V 703
2024-01-13 03:13:49 C 00 12 03.600 -07 20 23.42 V 703
2024-01-13 03:17:05 C 00 12 03.935 -07 20 20.94 V 703
2024-01-13 03:20:21 C 00 12 04.273 -07 20 18.56 V 703
2024-01-13 03:23:36 C 00 12 04.619 -07 20 15.90 V 703
2024-01-13 05:00:53 C 00 12 14.904 -07 19 01.16 V T08
2024-01-13 05:08:32 C 00 12 15.720 -07 18 56.20 V T08
Radar Observations (6)
Epoch (UTC)ValueSigmaUnitsFreq (MHz)ReceiverTransmitter
1985-07-08 08:00:00 20560 6 Hz 2380 -1 -1
1985-07-08.333333 2056000 600 Hz 2380 251 251
1985-07-09 08:09:00 202574571 16 us 2380 -1 -1
1985-07-09.339583 20257457100 16000 us 2380 251 251
2013-06-27 09:40:00 323904701.64 5 us 2380 -1 -1
2013-07-04 09:14:00 321083718.18 5 us 2380 -1 -1
Station codes
-1 Arecibo (305-m, 1963–2020)