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
2021-09-17 08:43:58 S 06 20 54.758 +15 14 25.40 V C57
2021-09-17 08:43:58 s 1 +149910.31 3 +19673.198 9470.0 C57
2021-09-17 08:53:58 S 06 20 55.138 +15 14 26.95 V C57
2021-09-17 08:53:58 s 1 +150337.48 2 +20668.214 4960.0 C57
2021-09-17 09:03:58 S 06 20 55.726 +15 14 25.51 V C57
2021-09-17 09:03:58 s 1 +150759.35 5 +21662.491 2930.0 C57
2021-09-17 09:13:58 S 06 20 56.522 +15 14 25.40 V C57
2021-09-17 09:13:58 s 1 +151175.97 5 +22656.004 3530.0 C57
2021-09-17 09:23:58 S 06 20 56.827 +15 14 22.42 V C57
2021-09-17 09:23:58 s 1 +151587.38 2 +23648.725 6890.0 C57
2021-09-17 09:33:58 S 06 20 57.475 +15 14 23.24 V C57
2021-09-17 09:33:58 s 1 +151993.61 9 +24640.630 3150.0 C57
2021-09-17 09:43:58 S 06 20 57.790 +15 14 21.55 V C57
2021-09-17 09:43:58 s 1 +152394.72 4 +25631.693 2440.0 C57
2021-09-17 09:53:58 S 06 20 58.462 +15 14 26.52 V C57
2021-09-17 09:53:58 s 1 +152790.74 0 +26621.889 4900.0 C57
2021-09-17 11:13:58 S 06 21 02.417 +15 14 15.94 V C57
2021-09-17 11:13:58 s 1 +155780.34 7 +34509.546 4310.0 C57
2021-09-17 11:23:58 S 06 21 03.158 +15 14 15.22 V C57
2021-09-17 11:23:58 s 1 +156132.31 2 +35490.944 1140.0 C57
2021-09-17 11:33:58 S 06 21 03.754 +15 14 13.49 V C57
2021-09-17 11:33:58 s 1 +156479.57 1 +36471.263 2410.0 C57
2021-09-17 11:43:58 S 06 21 04.178 +15 14 12.88 V C57
2021-09-17 11:43:58 s 1 +156822.16 3 +37450.484 8250.0 C57
2021-09-17 11:53:58 S 06 21 04.687 +15 14 13.78 V C57
2021-09-17 11:53:58 s 1 +157160.12 3 +38428.589 8790.0 C57
2021-09-17 12:03:58 S 06 21 05.165 +15 14 11.36 V C57
2021-09-17 12:03:58 s 1 +157493.48 8 +39405.561 4140.0 C57
2021-09-17 12:13:58 S 06 21 05.753 +15 14 11.83 V C57
2021-09-17 12:13:58 s 1 +157822.29 3 +40381.382 4420.0 C57
2021-09-17 12:23:58 S 06 21 06.221 +15 14 09.64 V C57
2021-09-17 12:23:58 s 1 +158146.57 4 +41356.035 9760.0 C57
2021-09-17 12:33:58 S 06 21 06.842 +15 14 07.44 V C57
2021-09-17 12:33:58 s 1 +158466.36 5 +42329.505 260.0 C57
2021-09-17 13:13:58 S 06 21 08.597 +15 14 05.06 V C57
2021-09-17 13:13:58 s 1 +159701.33 4 +46211.237 6230.0 C57
2021-09-17 13:23:58 S 06 21 09.427 +15 14 03.05 V C57
2021-09-17 13:23:58 s 1 +159999.19 7 +47178.558 4290.0 C57
2021-09-17 13:33:58 S 06 21 09.898 +15 14 02.15 V C57
2021-09-17 13:33:58 s 1 +160292.77 6 +48144.607 8190.0 C57
2021-09-17 13:43:58 S 06 21 10.462 +15 14 03.01 V C57
2021-09-17 13:43:58 s 1 +160582.10 3 +49109.368 8040.0 C57
2021-09-17 13:53:58 S 06 21 10.951 +15 14 01.10 V C57
2021-09-17 13:53:58 s 1 +160867.21 1 +50072.830 3970.0 C57
2021-09-17 14:03:58 S 06 21 11.422 +15 14 00.53 V C57
2021-09-17 14:03:58 s 1 +161148.13 3 +51034.980 6060.0 C57
2021-09-17 14:13:58 S 06 21 11.885 +15 14 00.35 V C57
2021-09-17 14:13:58 s 1 +161424.90 0 +51995.804 4440.0 C57
2021-09-17 14:23:58 S 06 21 12.516 +15 13 58.37 V C57
2021-09-17 14:23:58 s 1 +161697.54 5 +52955.291 9200.0 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)