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
2021-10-04 03:43:58 S 06 37 47.515 +14 27 59.26 V C57
2021-10-04 03:43:58 s 1 +83960.001 0 +344371.18 2850.0 C57
2021-10-04 03:53:58 S 06 37 47.868 +14 27 56.88 V C57
2021-10-04 03:53:58 s 1 +83612.636 0 +344614.54 2830.0 C57
2021-10-04 04:03:58 S 06 37 48.276 +14 27 56.88 V C57
2021-10-04 04:03:58 s 1 +83265.014 0 +344856.78 2020.0 C57
2021-10-04 04:13:58 S 06 37 48.434 +14 27 55.48 V C57
2021-10-04 04:13:58 s 1 +82917.137 0 +345097.92 410.0 C57
2021-10-04 04:23:58 S 06 37 48.665 +14 27 53.24 V C57
2021-10-04 04:23:58 s 1 +82569.006 0 +345337.95 8010.0 C57
2021-10-04 04:33:58 S 06 37 49.001 +14 27 53.60 V C57
2021-10-04 04:33:58 s 1 +82220.624 0 +345576.87 4830.0 C57
2021-10-04 04:43:58 S 06 37 49.325 +14 27 52.85 V C57
2021-10-04 04:43:58 s 1 +81871.991 0 +345814.68 870.0 C57
2021-10-04 04:53:58 S 06 37 49.769 +14 27 51.16 V C57
2021-10-04 04:53:58 s 1 +81523.108 0 +346051.38 6140.0 C57
2021-10-04 05:43:58 S 06 37 51.257 +14 27 42.23 V C57
2021-10-04 05:43:58 s 1 +79775.006 0 +347218.29 1050.0 C57
2021-10-04 05:53:58 S 06 37 51.662 +14 27 43.02 V C57
2021-10-04 05:53:58 s 1 +79424.658 0 +347448.36 1780.0 C57
2021-10-04 06:03:58 S 06 37 51.847 +14 27 41.29 V C57
2021-10-04 06:03:58 s 1 +79074.070 0 +347677.32 1770.0 C57
2021-10-04 06:13:58 S 06 37 52.229 +14 27 38.41 V C57
2021-10-04 06:13:58 s 1 +78723.244 0 +347905.17 1020.0 C57
2021-10-04 06:23:58 S 06 37 52.582 +14 27 38.41 V C57
2021-10-04 06:23:58 s 1 +78372.182 0 +348131.93 9540.0 C57
2021-10-04 06:33:58 S 06 37 52.901 +14 27 37.51 V C57
2021-10-04 06:33:58 s 1 +78020.885 0 +348357.58 7330.0 C57
2021-10-04 06:43:58 S 06 37 53.141 +14 27 36.07 V C57
2021-10-04 06:43:58 s 1 +77669.354 0 +348582.13 4400.0 C57
2021-10-04 07:23:58 S 06 37 54.377 +14 27 30.64 V C57
2021-10-04 07:23:58 s 1 +76260.919 0 +349469.31 5540.0 C57
2021-10-04 08:03:58 S 06 37 55.625 +14 27 26.75 V C57
2021-10-04 08:03:58 s 1 +74848.854 0 +350338.90 5480.0 C57
2021-10-04 08:23:58 S 06 37 56.309 +14 27 22.82 V C57
2021-10-04 08:23:58 s 1 +74141.488 0 +350767.11 6340.0 C57
2021-10-04 08:33:58 S 06 37 56.556 +14 27 22.43 V C57
2021-10-04 08:33:58 s 1 +73787.476 0 +350979.57 5750.0 C57
2021-10-04 08:43:58 S 06 37 56.954 +14 27 22.64 V C57
2021-10-04 08:43:58 s 1 +73433.247 0 +351190.93 4500.0 C57
2021-10-04 08:53:58 S 06 37 57.139 +14 27 19.94 V C57
2021-10-04 08:53:58 s 1 +73078.801 0 +351401.20 2590.0 C57
2021-10-04 09:03:58 S 06 37 57.482 +14 27 20.41 V C57
2021-10-04 09:03:58 s 1 +72724.141 0 +351610.38 10.0 C57
2021-10-04 09:13:58 S 06 37 57.862 +14 27 16.60 V C57
2021-10-04 09:13:58 s 1 +72369.268 0 +351818.45 6780.0 C57
2021-10-04 09:23:58 S 06 37 58.200 +14 27 15.84 V C57
2021-10-04 09:23:58 s 1 +72014.183 0 +352025.44 2890.0 C57
2021-10-04 09:33:58 S 06 37 58.490 +14 27 15.73 V C57
2021-10-04 09:33:58 s 1 +71658.887 0 +352231.33 8360.0 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)