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
2021-09-30 15:53:58 s 1 +169186.34 2 +60979.200 4230.0 C57
2021-09-30 16:03:58 S 06 34 53.782 +14 37 39.54 V C57
2021-09-30 16:03:58 s 1 +169425.87 8 +61902.639 4250.0 C57
2021-09-30 16:13:58 S 06 34 53.909 +14 37 38.21 V C57
2021-09-30 16:13:58 s 1 +169661.80 1 +62824.750 2450.0 C57
2021-09-30 16:23:58 S 06 34 54.564 +14 37 38.42 V C57
2021-09-30 16:23:58 s 1 +169894.13 5 +63745.526 8900.0 C57
2021-09-30 16:33:58 S 06 34 54.895 +14 37 35.04 V C57
2021-09-30 16:33:58 s 1 +170122.90 5 +64664.959 3680.0 C57
2021-09-30 16:43:58 S 06 34 55.193 +14 37 35.47 V C57
2021-09-30 16:43:58 s 1 +170348.13 8 +65583.040 6890.0 C57
2021-09-30 16:53:58 S 06 34 55.790 +14 37 35.29 V C57
2021-09-30 16:53:58 s 1 +170569.85 8 +66499.762 8600.0 C57
2021-09-30 17:43:58 S 06 34 57.542 +14 37 29.50 V C57
2021-09-30 17:43:58 s 1 +171626.62 8 +71062.733 7580.0 C57
2021-09-30 17:53:58 S 06 34 57.953 +14 37 28.60 V C57
2021-09-30 17:53:58 s 1 +171827.78 5 +71971.151 2020.0 C57
2021-09-30 18:03:58 S 06 34 58.435 +14 37 25.68 V C57
2021-09-30 18:03:58 s 1 +172025.59 9 +72878.162 5530.0 C57
2021-09-30 18:13:58 S 06 34 58.800 +14 37 24.56 V C57
2021-09-30 18:13:58 s 1 +172220.09 3 +73783.759 8170.0 C57
2021-09-30 18:23:58 S 06 34 59.057 +14 37 25.32 V C57
2021-09-30 18:23:58 s 1 +172411.28 9 +74687.936 40.0 C57
2021-09-30 18:33:58 S 06 34 59.479 +14 37 23.70 V C57
2021-09-30 18:33:58 s 1 +172599.21 2 +75590.688 1200.0 C57
2021-09-30 18:43:58 S 06 34 59.887 +14 37 22.91 V C57
2021-09-30 18:43:58 s 1 +172783.88 3 +76492.009 1730.0 C57
2021-09-30 18:53:58 S 06 35 00.312 +14 37 23.27 V C57
2021-09-30 18:53:58 s 1 +172965.32 6 +77391.894 1700.0 C57
2021-09-30 19:03:58 S 06 35 00.754 +14 37 21.58 V C57
2021-09-30 19:03:58 s 1 +173143.56 2 +78290.336 1190.0 C57
2021-09-30 19:13:58 S 06 35 01.022 +14 37 18.26 V C57
2021-09-30 19:13:58 s 1 +173318.61 4 +79187.332 270.0 C57
2021-09-30 19:23:58 S 06 35 01.435 +14 37 19.24 V C57
2021-09-30 19:23:58 s 1 +173490.50 3 +80082.875 9010.0 C57
2021-09-30 19:33:58 S 06 35 01.913 +14 37 22.51 V C57
2021-09-30 19:33:58 s 1 +173659.25 2 +80976.961 7490.0 C57
2021-09-30 20:23:58 S 06 35 03.713 +14 37 10.99 V C57
2021-09-30 20:23:58 s 1 +174456.63 2 +85425.373 8370.0 C57
2021-09-30 20:33:58 S 06 35 04.207 +14 37 14.05 V C57
2021-09-30 20:33:58 s 1 +174606.98 2 +86310.622 6720.0 C57
2021-09-30 20:43:58 S 06 35 04.450 +14 37 11.82 V C57
2021-09-30 20:43:58 s 1 +174754.33 9 +87194.382 5300.0 C57
2021-09-30 20:53:58 S 06 35 04.980 +14 37 11.14 V C57
2021-09-30 20:53:58 s 1 +174898.72 2 +88076.652 4170.0 C57
2021-09-30 21:03:58 S 06 35 05.374 +14 37 08.33 V C57
2021-09-30 21:03:58 s 1 +175040.15 2 +88957.426 3390.0 C57
2021-09-30 21:13:58 S 06 35 05.669 +14 37 08.40 V C57
2021-09-30 21:13:58 s 1 +175178.64 8 +89836.702 3030.0 C57
2021-09-30 21:23:58 S 06 35 05.966 +14 37 05.34 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)