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
2021-11-29 07:23:54 s 1 -128462.44 0 +294110.96 720.0 C57
2021-11-29 07:33:54 S 06 29 41.626 +12 51 24.98 V C57
2021-11-29 07:33:54 s 1 -128727.44 6 +293671.21 3030.0 C57
2021-11-29 07:43:54 S 06 29 41.083 +12 51 25.49 V C57
2021-11-29 07:43:54 s 1 -128991.90 6 +293230.24 2970.0 C57
2021-11-29 07:53:54 S 06 29 40.610 +12 51 25.67 V C57
2021-11-29 07:53:54 s 1 -129255.81 9 +292788.04 550.0 C57
2021-11-29 08:03:54 S 06 29 40.070 +12 51 25.09 V C57
2021-11-29 08:03:54 s 1 -129519.18 2 +292344.61 5740.0 C57
2021-11-29 08:13:54 S 06 29 39.682 +12 51 25.24 V C57
2021-11-29 08:13:54 s 1 -129781.99 1 +291899.95 8550.0 C57
2021-11-29 08:23:54 S 06 29 39.142 +12 51 26.60 V C57
2021-11-29 08:23:54 s 1 -130044.24 5 +291454.07 8950.0 C57
2021-11-29 08:33:54 S 06 29 38.642 +12 51 25.52 V C57
2021-11-29 08:33:54 s 1 -130305.94 2 +291006.95 6950.0 C57
2021-11-29 08:43:54 S 06 29 38.208 +12 51 26.71 V C57
2021-11-29 08:43:54 s 1 -130567.07 8 +290558.60 2530.0 C57
2021-11-29 08:53:54 S 06 29 37.692 +12 51 26.71 V C57
2021-11-29 08:53:54 s 1 -130827.65 1 +290109.01 5670.0 C57
2021-11-29 09:03:54 S 06 29 37.133 +12 51 25.70 V C57
2021-11-29 09:03:54 s 1 -131087.65 8 +289658.19 6380.0 C57
2021-11-29 09:13:54 S 06 29 36.787 +12 51 26.50 V C57
2021-11-29 09:13:54 s 1 -131347.09 7 +289206.14 4630.0 C57
2021-11-29 09:23:54 S 06 29 36.187 +12 51 26.60 V C57
2021-11-29 09:23:54 s 1 -131605.96 6 +288752.84 420.0 C57
2021-11-29 09:33:54 S 06 29 35.741 +12 51 25.88 V C57
2021-11-29 09:33:54 s 1 -131864.26 2 +288298.31 3740.0 C57
2021-11-29 09:43:54 S 06 29 35.268 +12 51 25.85 V C57
2021-11-29 09:43:54 s 1 -132121.98 1 +287842.54 4580.0 C57
2021-11-29 09:53:54 S 06 29 34.810 +12 51 25.99 V C57
2021-11-29 09:53:54 s 1 -132379.12 3 +287385.52 2920.0 C57
2021-11-29 10:03:54 S 06 29 34.298 +12 51 26.28 V C57
2021-11-29 10:03:54 s 1 -132635.68 3 +286927.26 8760.0 C57
2021-11-29 10:13:54 S 06 29 33.977 +12 51 25.60 V C57
2021-11-29 10:13:54 s 1 -132891.65 9 +286467.76 2080.0 C57
2021-11-29 10:48:14 C 06 29 38.32 +12 51 15.9 V G96
2021-11-29 10:55:52 C 06 29 37.95 +12 51 16.2 V G96
2021-11-29 11:03:31 C 06 29 37.58 +12 51 16.5 V G96
2021-11-29 11:11:10 C 06 29 37.20 +12 51 16.6 V G96
2021-11-29 11:43:54 S 06 29 29.088 +12 51 27.11 V C57
2021-11-29 11:43:54 s 1 -135168.73 8 +282276.02 7000.0 C57
2021-11-29 11:53:54 S 06 29 28.783 +12 51 27.07 V C57
2021-11-29 11:53:54 s 1 -135418.72 9 +281803.99 4570.0 C57
2021-11-29 12:03:54 S 06 29 28.202 +12 51 27.04 V C57
2021-11-29 12:03:54 s 1 -135668.10 6 +281330.71 9500.0 C57
2021-11-29 12:13:54 S 06 29 27.684 +12 51 28.01 V C57
2021-11-29 12:13:54 s 1 -135916.86 7 +280856.17 1780.0 C57
2021-11-29 12:23:54 S 06 29 27.322 +12 51 28.08 V C57
2021-11-29 12:23:54 s 1 -136165.00 9 +280380.37 1400.0 C57
2021-11-29 12:33:54 S 06 29 26.830 +12 51 28.12 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)