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
2023-05-29 02:34:02 v 1 286.90038 +40.92644 270
2023-05-30 07:00:29 S 12 23 43.61 +14 55 58.6 L C51
2023-05-30 10:07:32 S 12 23 45.47 +14 54 58.9 L C51
2023-05-30 13:14:23 S 12 23 47.39 +14 53 59.1 L C51
2023-05-30 16:21:25 S 12 23 49.30 +14 52 58.5 L C51
2023-05-30 17:54:45 S 12 23 50.29 +14 52 28.4 L C51
2023-05-30 19:28:16 S 12 23 51.29 +14 51 58.0 L C51
2023-05-30 21:01:47 S 12 23 52.31 +14 51 27.5 L C51
2023-05-30 22:35:07 S 12 23 53.33 +14 50 57.0 L C51
2023-05-31 00:08:38 S 12 23 54.36 +14 50 26.2 L C51
2023-05-31 01:42:09 S 12 23 55.42 +14 49 55.4 L C51
2023-05-31 03:15:29 S 12 23 56.47 +14 49 24.8 L C51
2023-05-31 03:15:40 S 12 23 56.48 +14 49 24.5 L C51
2023-05-31 06:22:31 S 12 23 58.63 +14 48 22.6 L C51
2023-05-31 09:29:22 S 12 24 00.82 +14 47 20.4 L C51
2023-05-31 12:36:24 S 12 24 03.08 +14 46 17.6 L C51
2023-06-01 01:07:09 C 12 24 12.422 +14 42 10.01 V W68
2023-06-01 01:20:58 C 12 24 12.569 +14 42 05.04 V W68
2023-06-01 01:25:33 C 12 24 12.622 +14 42 03.49 V W68
2023-06-01 01:46:45 C 12 24 12.828 +14 41 56.15 V W68
2023-06-01 18:54:50 C 12 24 27.102 +14 35 42.76 V 089
2023-06-01 18:57:12 C 12 24 27.136 +14 35 42.12 V 089
2023-06-01 18:59:34 C 12 24 27.144 +14 35 41.08 V 089
2023-06-01 19:01:56 C 12 24 27.195 +14 35 40.04 V 089
2023-06-01 19:04:18 C 12 24 27.235 +14 35 39.36 V 089
2023-06-02 20:17:40 C 12 24 50.613 +14 26 30.27 V 089
2023-06-02 20:20:02 C 12 24 50.654 +14 26 29.25 V 089
2023-06-02 20:28:33 C 12 24 50.767 +14 26 26.12 V 089
2023-06-02 20:30:55 C 12 24 50.819 +14 26 25.24 V 089
2023-06-02 20:37:42 C 12 24 50.916 +14 26 22.79 V 089
2023-06-02 20:42:26 C 12 24 50.996 +14 26 20.40 V 089
2023-06-02 20:47:42 C 12 24 51.018 +14 26 19.50 V 089
2023-06-02 20:50:04 C 12 24 51.086 +14 26 18.39 V 089
2023-06-02 20:54:08 C 12 24 51.146 +14 26 16.35 V 089
2023-06-03 18:51:25 C 12 25 14.314 +14 18 00.82 V 089
2023-06-03 18:56:09 C 12 25 14.390 +14 17 58.41 V 089
2023-06-03 18:58:31 C 12 25 14.439 +14 17 57.88 V 089
2023-06-03 19:00:53 C 12 25 14.454 +14 17 56.63 V 089
2023-06-03 19:03:15 C 12 25 14.515 +14 17 55.97 V 089
2023-06-03 19:05:37 C 12 25 14.529 +14 17 54.82 V 089
2023-06-03 21:22:36 C 12 25 17.00 +14 17 01.7 V G33
2023-06-03 21:23:27 C 12 25 17.02 +14 17 01.3 V G33
2023-06-03 21:26:48 C 12 25 17.06 +14 16 59.9 V G33
2023-06-04 19:40:40 C 12 25 42.819 +14 08 18.37 V 089
2023-06-04 19:43:02 C 12 25 42.850 +14 08 17.59 V 089
2023-06-04 19:45:24 C 12 25 42.899 +14 08 16.46 V 089
2023-06-04 19:47:46 C 12 25 42.947 +14 08 15.68 V 089
2023-06-04 19:50:08 C 12 25 42.980 +14 08 14.77 V 089
2023-06-04 19:52:30 C 12 25 43.017 +14 08 13.63 V 089
2023-06-04 19:54:52 C 12 25 43.082 +14 08 12.91 V 089
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)