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
2021-12-01 11:43:54 s 1 -163742.93 4 +87614.294 6680.0 C57
2021-12-01 11:53:54 S 06 27 05.714 +12 52 17.76 V C57
2021-12-01 11:53:54 s 1 -163582.65 9 +86709.851 3360.0 C57
2021-12-01 12:03:54 S 06 27 05.258 +12 52 17.22 V C57
2021-12-01 12:03:54 s 1 -163419.29 0 +85803.766 7480.0 C57
2021-12-01 12:13:54 S 06 27 04.666 +12 52 17.90 V C57
2021-12-01 12:13:54 s 1 -163252.80 4 +84896.041 8960.0 C57
2021-12-01 12:23:54 S 06 27 04.145 +12 52 18.80 V C57
2021-12-01 12:23:54 s 1 -163083.17 7 +83986.680 7700.0 C57
2021-12-01 12:33:54 S 06 27 03.809 +12 52 19.31 V C57
2021-12-01 12:33:54 s 1 -162910.38 5 +83075.685 3620.0 C57
2021-12-01 12:43:54 S 06 27 03.238 +12 52 18.44 V C57
2021-12-01 12:43:54 s 1 -162734.40 5 +82163.060 6600.0 C57
2021-12-01 12:53:54 S 06 27 02.743 +12 52 18.66 V C57
2021-12-01 12:53:54 s 1 -162555.21 1 +81248.809 6560.0 C57
2021-12-01 13:03:54 S 06 27 02.191 +12 52 19.63 V C57
2021-12-01 13:03:54 s 1 -162372.77 8 +80332.937 3410.0 C57
2021-12-01 13:13:54 S 06 27 01.651 +12 52 20.53 V C57
2021-12-01 13:13:54 s 1 -162187.08 3 +79415.446 7040.0 C57
2021-12-01 13:23:54 S 06 27 01.078 +12 52 19.96 V C57
2021-12-01 13:23:54 s 1 -161998.10 0 +78496.341 7350.0 C57
2021-12-01 13:43:54 S 06 27 00.182 +12 52 20.71 V C57
2021-12-01 13:43:54 s 1 -161610.16 5 +76653.307 7620.0 C57
2021-12-01 13:53:54 S 06 26 59.554 +12 52 21.32 V C57
2021-12-01 13:53:54 s 1 -161411.16 3 +75729.388 7370.0 C57
2021-12-01 14:03:54 S 06 26 59.268 +12 52 20.32 V C57
2021-12-01 14:03:54 s 1 -161208.76 8 +74803.873 3410.0 C57
2021-12-01 14:13:54 S 06 26 58.752 +12 52 20.93 V C57
2021-12-01 14:13:54 s 1 -161002.95 5 +73876.767 5620.0 C57
2021-12-01 14:23:54 S 06 26 58.210 +12 52 20.89 V C57
2021-12-01 14:23:54 s 1 -160793.69 7 +72948.077 3900.0 C57
2021-12-01 14:33:54 S 06 26 57.715 +12 52 21.79 V C57
2021-12-01 14:33:54 s 1 -160580.96 7 +72017.806 8140.0 C57
2021-12-01 14:43:54 S 06 26 57.288 +12 52 21.07 V C57
2021-12-01 14:43:54 s 1 -160364.73 6 +71085.962 8230.0 C57
2021-12-01 14:53:54 S 06 26 56.880 +12 52 21.25 V C57
2021-12-01 14:53:54 s 1 -160144.97 9 +70152.550 4080.0 C57
2021-12-01 15:03:54 S 06 26 56.268 +12 52 20.78 V C57
2021-12-01 15:03:54 s 1 -159921.66 5 +69217.576 5560.0 C57
2021-12-01 15:13:54 S 06 26 55.781 +12 52 20.82 V C57
2021-12-01 15:13:54 s 1 -159694.76 8 +68281.046 2570.0 C57
2021-12-01 15:23:54 S 06 26 55.423 +12 52 21.29 V C57
2021-12-01 15:23:54 s 1 -159464.25 9 +67342.967 4990.0 C57
2021-12-01 15:33:54 S 06 26 54.871 +12 52 22.04 V C57
2021-12-01 15:33:54 s 1 -159230.10 8 +66403.346 2710.0 C57
2021-12-01 15:43:54 S 06 26 54.502 +12 52 22.19 V C57
2021-12-01 15:43:54 s 1 -158992.28 7 +65462.189 5630.0 C57
2021-12-01 15:53:54 S 06 26 53.935 +12 52 21.36 V C57
2021-12-01 15:53:54 s 1 -158750.76 6 +64519.504 3620.0 C57
2021-12-01 16:03:54 S 06 26 53.448 +12 52 23.16 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)