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
2023-05-09 14:38:19 V 12 29 01.03 +16 04 38.7 V 270
2023-05-09 14:38:19 v 1 135.50844 +34.81766 270
2023-05-09 14:51:01 V 12 29 00.62 +16 04 39.7 V 270
2023-05-09 14:51:01 v 1 135.50844 +34.81766 270
2023-05-10 02:46:11 C 12 28 39.432 +16 05 31.42 V W68
2023-05-10 02:54:06 C 12 28 39.170 +16 05 31.70 V W68
2023-05-10 02:58:45 C 12 28 39.022 +16 05 31.96 V W68
2023-05-10 03:17:58 C 12 28 38.393 +16 05 32.89 V W68
2023-05-10 07:36:41 V 12 28 31.29 +16 05 47.0 V 270
2023-05-10 07:36:41 v 1 172.60855 -43.58725 270
2023-05-10 08:01:54 V 12 28 30.47 +16 05 48.4 V 270
2023-05-10 08:01:54 v 1 172.60855 -43.58725 270
2023-05-10 08:31:00 V 12 28 29.58 +16 05 51.4 V 270
2023-05-10 08:31:00 v 1 172.60855 -43.58725 270
2023-05-10 08:56:13 V 12 28 28.74 +16 05 53.0 V 270
2023-05-10 08:56:13 v 1 172.60855 -43.58725 270
2023-05-11 13:26:19 V 12 27 40.36 +16 06 34.6 V 270
2023-05-11 13:26:19 v 1 135.50854 +34.81778 270
2023-05-11 14:13:50 V 12 27 38.87 +16 06 34.0 V 270
2023-05-11 14:13:50 v 1 135.50854 +34.81778 270
2023-05-11 14:28:07 V 12 27 38.44 +16 06 34.0 V 270
2023-05-11 14:28:07 v 1 135.50854 +34.81778 270
2023-05-11 14:41:49 V 12 27 38.03 +16 06 34.3 V 270
2023-05-11 14:41:49 v 1 135.50854 +34.81778 270
2023-05-11 19:15:07 C 12 27 31.174 +16 06 38.11 V L92
2023-05-11 19:24:18 C 12 27 30.909 +16 06 38.18 V L92
2023-05-11 19:34:34 C 12 27 30.611 +16 06 38.16 V L92
2023-05-11 19:44:46 C 12 27 30.265 +16 06 38.80 V L92
2023-05-11 19:55:02 C 12 27 30.005 +16 06 38.33 V L92
2023-05-12 01:45:58 V 12 27 20.75 +16 06 44.1 V 270
2023-05-12 01:45:58 v 1 285.03197 +40.20052 270
2023-05-12 02:27:36 V 12 27 19.68 +16 06 44.4 V 270
2023-05-12 02:27:36 v 1 285.03197 +40.20052 270
2023-05-12 03:14:44 V 12 27 18.33 +16 06 44.4 V 270
2023-05-12 03:14:44 v 1 285.03197 +40.20052 270
2023-05-12 03:56:54 V 12 27 17.08 +16 06 45.5 V 270
2023-05-12 03:56:54 v 1 285.03197 +40.20052 270
2023-05-14 11:27:54 C 12 25 58.337 +16 06 05.62 V P07
2023-05-14 12:29:01 C 12 25 56.820 +16 06 03.56 V P07
2023-05-14 13:39:01 C 12 25 55.099 +16 06 00.86 V P07
2023-05-14 14:51:58 C 12 25 53.285 +16 05 57.70 V P07
2023-05-15 02:33:57 B 12 25 38.85 +16 05 12.7 V H89
2023-05-15 03:58:26 B 12 25 36.96 +16 05 08.2 V H89
2023-05-15 05:14:53 B 12 25 35.26 +16 05 03.6 V H89
2023-05-15 08:00:09 C 12 25 32.215 +16 05 00.17 V T05
2023-05-15 08:04:57 C 12 25 32.102 +16 04 59.84 V T05
2023-05-15 08:12:27 C 12 25 31.932 +16 04 59.45 V T05
2023-05-15 08:26:49 C 12 25 31.596 +16 04 58.58 V T05
2023-05-18 19:16:53 C 12 24 09.710 +15 57 44.93 V M22
2023-05-18 19:22:09 C 12 24 09.626 +15 57 44.32 V M22
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)