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
2021-09-30 21:23:58 s 1 +175314.23 0 +90714.475 3150.0 C57
2021-09-30 21:33:58 S 06 35 06.492 +14 37 05.02 V C57
2021-09-30 21:33:58 s 1 +175446.91 8 +91590.743 3820.0 C57
2021-09-30 21:43:58 S 06 35 06.804 +14 37 02.57 V C57
2021-09-30 21:43:58 s 1 +175576.73 1 +92465.502 5100.0 C57
2021-09-30 22:43:58 S 06 35 09.038 +14 36 57.64 V C57
2021-09-30 22:43:58 s 1 +176296.30 4 +97682.204 9180.0 C57
2021-09-30 22:53:58 S 06 35 09.408 +14 36 58.03 V C57
2021-09-30 22:53:58 s 1 +176406.52 2 +98546.319 6490.0 C57
2021-09-30 23:03:58 S 06 35 09.734 +14 36 56.99 V C57
2021-09-30 23:03:58 s 1 +176514.01 4 +99408.904 4910.0 C57
2021-09-30 23:53:58 S 06 35 11.690 +14 36 51.19 V C57
2021-09-30 23:53:58 s 1 +177011.21 3 +103698.78 5640.0 C57
2021-10-01 01:13:58 S 06 35 14.712 +14 36 43.56 V C57
2021-10-01 01:13:58 s 1 +177671.32 7 +110482.22 1110.0 C57
2021-10-01 01:23:58 S 06 35 15.050 +14 36 42.66 V C57
2021-10-01 01:23:58 s 1 +177742.47 4 +111323.17 970.0 C57
2021-10-01 01:33:58 S 06 35 15.571 +14 36 41.33 V C57
2021-10-01 01:33:58 s 1 +177811.14 8 +112162.55 2780.0 C57
2021-10-01 01:43:58 S 06 35 15.965 +14 36 39.78 V C57
2021-10-01 01:43:58 s 1 +177877.36 6 +113000.38 6570.0 C57
2021-10-01 01:53:58 S 06 35 16.222 +14 36 37.37 V C57
2021-10-01 01:53:58 s 1 +177941.14 3 +113836.64 2410.0 C57
2021-10-01 02:03:58 S 06 35 16.613 +14 36 36.43 V C57
2021-10-01 02:03:58 s 1 +178002.49 5 +114671.35 350.0 C57
2021-10-01 02:13:58 S 06 35 17.009 +14 36 36.50 V C57
2021-10-01 02:13:58 s 1 +178061.43 6 +115504.49 430.0 C57
2021-10-01 02:23:58 S 06 35 17.246 +14 36 37.19 V C57
2021-10-01 02:23:58 s 1 +178117.98 3 +116336.07 2700.0 C57
2021-10-01 03:33:58 S 06 35 20.078 +14 36 28.69 V C57
2021-10-01 03:33:58 s 1 +178448.00 8 +122113.31 4210.0 C57
2021-10-01 03:43:58 S 06 35 20.316 +14 36 28.12 V C57
2021-10-01 03:43:58 s 1 +178485.93 0 +122932.36 5800.0 C57
2021-10-01 03:53:58 S 06 35 20.726 +14 36 26.17 V C57
2021-10-01 03:53:58 s 1 +178521.58 9 +123749.84 20.0 C57
2021-10-01 04:03:58 S 06 35 21.137 +14 36 24.01 V C57
2021-10-01 04:03:58 s 1 +178554.99 8 +124565.76 6920.0 C57
2021-10-01 04:13:58 S 06 35 21.377 +14 36 24.73 V C57
2021-10-01 04:13:58 s 1 +178586.17 3 +125380.10 6530.0 C57
2021-10-01 04:23:58 S 06 35 21.804 +14 36 22.50 V C57
2021-10-01 04:23:58 s 1 +178615.12 5 +126192.88 8910.0 C57
2021-10-01 04:33:58 S 06 35 22.265 +14 36 21.82 V C57
2021-10-01 04:33:58 s 1 +178641.87 0 +127004.08 4100.0 C57
2021-10-01 04:43:58 S 06 35 22.627 +14 36 21.28 V C57
2021-10-01 04:43:58 s 1 +178666.42 1 +127813.72 2150.0 C57
2021-10-01 04:53:58 S 06 35 22.990 +14 36 20.27 V C57
2021-10-01 04:53:58 s 1 +178688.79 1 +128621.78 3100.0 C57
2021-10-01 05:53:58 S 06 35 25.157 +14 36 14.40 V C57
2021-10-01 05:53:58 s 1 +178777.95 6 +133437.19 2110.0 C57
2021-10-01 06:03:58 S 06 35 25.560 +14 36 11.27 V C57
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)