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
2021-09-18 22:53:58 s 1 +162892.22 7 +209478.55 6700.0 C57
2021-09-18 23:13:58 S 06 22 50.371 +15 10 54.48 V C57
2021-09-18 23:13:58 s 1 +162552.58 3 +210766.34 2700.0 C57
2021-09-18 23:23:58 S 06 22 50.806 +15 10 51.20 V C57
2021-09-18 23:23:58 s 1 +162381.00 4 +211407.95 4950.0 C57
2021-09-18 23:33:58 S 06 22 51.266 +15 10 50.38 V C57
2021-09-18 23:33:58 s 1 +162208.26 3 +212048.04 3390.0 C57
2021-09-18 23:43:58 S 06 22 51.874 +15 10 49.87 V C57
2021-09-18 23:43:58 s 1 +162034.36 5 +212686.61 8040.0 C57
2021-09-18 23:53:58 S 06 22 52.246 +15 10 48.29 V C57
2021-09-18 23:53:58 s 1 +161859.31 6 +213323.67 8930.0 C57
2021-09-19 00:03:58 S 06 22 52.843 +15 10 48.25 V C57
2021-09-19 00:03:58 s 1 +161683.12 3 +213959.21 6070.0 C57
2021-09-19 00:33:58 S 06 22 54.204 +15 10 43.61 V C57
2021-09-19 00:33:58 s 1 +161147.73 6 +215856.78 5190.0 C57
2021-09-19 00:43:58 S 06 22 54.758 +15 10 45.91 V C57
2021-09-19 00:43:58 s 1 +160967.02 4 +216486.28 7540.0 C57
2021-09-19 00:53:58 S 06 22 55.260 +15 10 41.27 V C57
2021-09-19 00:53:58 s 1 +160785.19 8 +217114.29 6230.0 C57
2021-09-19 01:23:58 S 06 22 56.534 +15 10 39.32 V C57
2021-09-19 01:23:58 s 1 +160233.08 6 +218989.28 610.0 C57
2021-09-19 01:33:58 S 06 22 57.041 +15 10 40.22 V C57
2021-09-19 01:33:58 s 1 +160046.85 8 +219611.28 4890.0 C57
2021-09-19 01:53:58 S 06 22 58.114 +15 10 37.67 V C57
2021-09-19 01:53:58 s 1 +159671.14 7 +220850.80 2820.0 C57
2021-09-19 02:03:58 S 06 22 58.478 +15 10 34.93 V C57
2021-09-19 02:03:58 s 1 +159481.67 7 +221468.31 6500.0 C57
2021-09-19 02:13:58 S 06 22 58.896 +15 10 35.26 V C57
2021-09-19 02:13:58 s 1 +159291.13 7 +222084.34 6680.0 C57
2021-09-19 02:23:58 S 06 22 59.424 +15 10 33.67 V C57
2021-09-19 02:23:58 s 1 +159099.53 3 +222698.88 3370.0 C57
2021-09-19 02:33:58 S 06 22 59.976 +15 10 34.82 V C57
2021-09-19 02:33:58 s 1 +158906.87 0 +223311.94 6610.0 C57
2021-09-19 02:43:58 S 06 23 00.367 +15 10 30.07 V C57
2021-09-19 02:43:58 s 1 +158713.15 4 +223923.50 6400.0 C57
2021-09-19 03:23:58 S 06 23 02.239 +15 10 26.80 V C57
2021-09-19 03:23:58 s 1 +157927.86 8 +226354.96 1460.0 C57
2021-09-19 03:33:58 S 06 23 02.731 +15 10 25.18 V C57
2021-09-19 03:33:58 s 1 +157728.96 7 +226959.13 4290.0 C57
2021-09-19 03:43:58 S 06 23 03.187 +15 10 24.31 V C57
2021-09-19 03:43:58 s 1 +157529.04 5 +227561.82 3780.0 C57
2021-09-19 03:53:58 S 06 23 03.691 +15 10 26.04 V C57
2021-09-19 03:53:58 s 1 +157328.10 8 +228163.05 9950.0 C57
2021-09-19 04:03:58 S 06 23 04.176 +15 10 23.74 V C57
2021-09-19 04:03:58 s 1 +157126.15 9 +228762.80 2810.0 C57
2021-09-19 04:13:58 S 06 23 04.622 +15 10 23.34 V C57
2021-09-19 04:13:58 s 1 +156923.20 5 +229361.08 2390.0 C57
2021-09-19 04:23:58 S 06 23 05.167 +15 10 22.33 V C57
2021-09-19 04:23:58 s 1 +156719.25 0 +229957.90 8690.0 C57
2021-09-19 04:33:58 S 06 23 05.674 +15 10 21.65 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)