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
2023-05-25 07:07:28 C 12 23 08.239 +15 29 21.05 V T05
2023-05-25 07:11:55 C 12 23 08.222 +15 29 20.04 V T05
2023-05-25 07:19:43 C 12 23 08.196 +15 29 18.24 V T05
2023-05-25 07:36:12 C 12 23 08.146 +15 29 14.21 V T05
2023-05-25 22:41:13 C 12 23 08.47 +15 25 28.9 X L63
2023-05-25 22:52:36 C 12 23 08.47 +15 25 25.9 X L63
2023-05-25 23:01:52 C 12 23 08.47 +15 25 23.5 X L63
2023-05-26 20:48:38 C 12 23 11.57 +15 19 49.1 X L63
2023-05-26 21:00:04 C 12 23 11.57 +15 19 45.4 X L63
2023-05-26 21:10:58 C 12 23 11.59 +15 19 43.0 X L63
2023-05-27 01:07:57 S 12 23 12.71 +15 18 45.0 L C51
2023-05-27 04:14:04 S 12 23 13.38 +15 17 55.9 L C51
2023-05-27 04:14:14 S 12 23 13.37 +15 17 55.5 L C51
2023-05-27 07:12:07 C 12 23 13.826 +15 17 06.79 V T05
2023-05-27 07:17:37 C 12 23 13.834 +15 17 05.28 V T05
2023-05-27 07:21:50 S 12 23 14.09 +15 17 04.5 L C51
2023-05-27 07:25:28 C 12 23 13.838 +15 17 03.08 V T05
2023-05-27 07:39:09 C 12 23 13.853 +15 16 59.38 V T05
2023-05-27 10:28:41 S 12 23 14.86 +15 16 13.7 L C51
2023-05-27 12:01:28 S 12 23 15.25 +15 15 48.8 L C51
2023-05-27 13:34:58 S 12 23 15.67 +15 15 23.1 L C51
2023-05-27 15:09:03 S 12 23 16.09 +15 14 56.8 L C51
2023-05-27 15:09:13 S 12 23 16.08 +15 14 56.4 L C51
2023-05-27 16:42:34 S 12 23 16.52 +15 14 30.8 L C51
2023-05-27 18:16:05 S 12 23 16.96 +15 14 04.8 L C51
2023-05-27 21:22:56 S 12 23 17.90 +15 13 12.7 L C51
2023-05-28 00:29:57 S 12 23 18.87 +15 12 19.9 L C51
2023-05-28 01:39:17 V 12 23 19.06 +15 11 56.1 V 270
2023-05-28 01:39:17 v 1 286.90038 +40.92644 270
2023-05-28 02:04:22 V 12 23 19.14 +15 11 48.9 V 270
2023-05-28 02:04:22 v 1 286.90038 +40.92644 270
2023-05-28 02:36:36 V 12 23 19.24 +15 11 39.9 V 270
2023-05-28 02:36:36 v 1 286.90038 +40.92644 270
2023-05-28 03:01:26 V 12 23 19.30 +15 11 32.2 V 270
2023-05-28 03:01:26 v 1 286.90038 +40.92644 270
2023-05-28 22:55:59 V 12 23 26.87 +15 05 43.6 V 270
2023-05-28 22:55:59 v 1 003.13800 +50.66054 270
2023-05-28 23:00:09 V 12 23 26.89 +15 05 42.4 V 270
2023-05-28 23:00:09 v 1 003.13800 +50.66054 270
2023-05-28 23:06:31 V 12 23 26.92 +15 05 40.2 V 270
2023-05-28 23:06:31 v 1 003.13800 +50.66054 270
2023-05-28 23:31:55 V 12 23 27.11 +15 05 32.3 V 270
2023-05-28 23:31:55 v 1 003.13800 +50.66054 270
2023-05-29 01:56:18 V 12 23 28.39 +15 04 52.7 V 270
2023-05-29 01:56:18 v 1 286.90038 +40.92644 270
2023-05-29 02:21:19 V 12 23 28.56 +15 04 43.9 V 270
2023-05-29 02:21:19 v 1 286.90038 +40.92644 270
2023-05-29 02:27:28 V 12 23 28.54 +15 04 41.8 V 270
2023-05-29 02:27:28 v 1 286.90038 +40.92644 270
2023-05-29 02:34:02 V 12 23 28.60 +15 04 40.2 V 270
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)