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
2021-11-23 17:43:55 s 1 +134238.58 7 +304064.99 3270.0 C57
2021-11-23 17:53:55 S 06 35 47.789 +12 50 47.94 V C57
2021-11-23 17:53:55 s 1 +133971.71 2 +304471.18 8560.0 C57
2021-11-23 18:03:55 S 06 35 47.321 +12 50 47.69 V C57
2021-11-23 18:03:55 s 1 +133704.32 4 +304876.22 2070.0 C57
2021-11-23 18:13:55 S 06 35 46.913 +12 50 48.59 V C57
2021-11-23 18:13:55 s 1 +133436.42 5 +305280.10 3830.0 C57
2021-11-23 18:23:55 S 06 35 46.536 +12 50 47.98 V C57
2021-11-23 18:23:55 s 1 +133168.01 9 +305682.83 3830.0 C57
2021-11-23 18:33:55 S 06 35 46.162 +12 50 47.65 V C57
2021-11-23 18:33:55 s 1 +132899.10 6 +306084.39 2090.0 C57
2021-11-23 18:43:55 S 06 35 45.658 +12 50 48.26 V C57
2021-11-23 18:43:55 s 1 +132629.69 0 +306484.81 8600.0 C57
2021-11-23 18:53:55 S 06 35 45.353 +12 50 46.86 V C57
2021-11-23 18:53:55 s 1 +132359.77 2 +306884.07 3390.0 C57
2021-11-23 19:03:55 S 06 35 44.940 +12 50 48.41 V C57
2021-11-23 19:03:55 s 1 +132089.35 4 +307282.18 6460.0 C57
2021-11-23 19:13:55 S 06 35 44.458 +12 50 48.12 V C57
2021-11-23 19:13:55 s 1 +131818.43 8 +307679.14 7810.0 C57
2021-11-23 19:23:55 S 06 35 44.088 +12 50 47.76 V C57
2021-11-23 19:23:55 s 1 +131547.02 7 +308074.94 7450.0 C57
2021-11-23 19:33:55 S 06 35 43.726 +12 50 47.65 V C57
2021-11-23 19:33:55 s 1 +131275.12 2 +308469.60 5390.0 C57
2021-11-23 19:43:55 S 06 35 43.219 +12 50 48.59 V C57
2021-11-23 19:43:55 s 1 +131002.72 7 +308863.11 1640.0 C57
2021-11-23 19:53:55 S 06 35 42.840 +12 50 47.58 V C57
2021-11-23 19:53:55 s 1 +130729.84 1 +309255.47 6210.0 C57
2021-11-23 20:03:55 S 06 35 42.406 +12 50 46.50 V C57
2021-11-23 20:03:55 s 1 +130456.46 9 +309646.69 9100.0 C57
2021-11-23 20:13:55 S 06 35 41.926 +12 50 47.11 V C57
2021-11-23 20:13:55 s 1 +130182.61 1 +310036.76 330.0 C57
2021-11-23 20:23:55 S 06 35 41.563 +12 50 48.23 V C57
2021-11-23 20:23:55 s 1 +129908.27 1 +310425.68 9890.0 C57
2021-11-23 20:33:55 S 06 35 41.186 +12 50 46.36 V C57
2021-11-23 20:33:55 s 1 +129633.44 9 +310813.46 7790.0 C57
2021-11-23 20:43:55 S 06 35 40.836 +12 50 48.70 V C57
2021-11-23 20:43:55 s 1 +129358.14 8 +311200.10 4050.0 C57
2021-11-23 20:53:55 S 06 35 40.310 +12 50 47.94 V C57
2021-11-23 20:53:55 s 1 +129082.36 9 +311585.60 8670.0 C57
2021-11-23 21:03:55 S 06 35 40.013 +12 50 47.29 V C57
2021-11-23 21:03:55 s 1 +128806.11 6 +311969.96 1660.0 C57
2021-11-23 21:13:55 S 06 35 39.494 +12 50 47.47 V C57
2021-11-23 21:13:55 s 1 +128529.39 0 +312353.17 3030.0 C57
2021-11-23 21:23:55 S 06 35 39.055 +12 50 48.08 V C57
2021-11-23 21:23:55 s 1 +128252.19 2 +312735.25 2770.0 C57
2021-11-23 21:33:55 S 06 35 38.674 +12 50 48.19 V C57
2021-11-23 21:33:55 s 1 +127974.52 6 +313116.19 910.0 C57
2021-11-23 21:43:55 S 06 35 38.321 +12 50 48.62 V C57
2021-11-23 21:43:55 s 1 +127696.39 2 +313495.99 7450.0 C57
2021-11-23 21:53:55 S 06 35 37.872 +12 50 48.66 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)