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 20:23:54 s 1 -150714.37 1 +38523.495 2440.0 C57
2021-12-01 20:33:54 S 06 26 40.226 +12 52 32.38 V C57
2021-12-01 20:33:54 s 1 -150355.92 1 +37542.149 640.0 C57
2021-12-01 20:43:54 S 06 26 39.758 +12 52 32.56 V C57
2021-12-01 20:43:54 s 1 -149992.76 6 +36559.622 10.0 C57
2021-12-01 20:53:54 S 06 26 39.406 +12 52 33.31 V C57
2021-12-01 20:53:54 s 1 -149624.86 6 +35575.931 390.0 C57
2021-12-01 21:03:54 S 06 26 38.894 +12 52 34.21 V C57
2021-12-01 21:03:54 s 1 -149252.18 0 +34591.095 1630.0 C57
2021-12-01 21:13:54 S 06 26 38.470 +12 52 34.57 V C57
2021-12-01 21:13:54 s 1 -148874.66 6 +33605.134 3580.0 C57
2021-12-01 21:23:54 S 06 26 37.877 +12 52 34.25 V C57
2021-12-01 21:23:54 s 1 -148492.28 4 +32618.067 6070.0 C57
2021-12-01 21:33:54 S 06 26 37.519 +12 52 35.51 V C57
2021-12-01 21:33:54 s 1 -148104.99 0 +31629.915 8930.0 C57
2021-12-01 21:43:54 S 06 26 36.912 +12 52 35.22 V C57
2021-12-01 21:43:54 s 1 -147712.74 3 +30640.697 2010.0 C57
2021-12-01 21:53:54 S 06 26 36.504 +12 52 35.90 V C57
2021-12-01 21:53:54 s 1 -147315.49 9 +29650.436 5140.0 C57
2021-12-01 22:03:54 S 06 26 35.957 +12 52 36.91 V C57
2021-12-01 22:03:54 s 1 -146913.21 6 +28659.153 8160.0 C57
2021-12-01 22:13:54 S 06 26 35.450 +12 52 36.34 V C57
2021-12-01 22:13:54 s 1 -146505.84 8 +27666.871 880.0 C57
2021-12-01 22:23:54 S 06 26 34.992 +12 52 35.76 V C57
2021-12-01 22:23:54 s 1 -146093.35 3 +26673.614 3160.0 C57
2021-12-01 22:33:54 S 06 26 34.488 +12 52 36.41 V C57
2021-12-01 22:33:54 s 1 -145675.68 5 +25679.405 4800.0 C57
2021-12-01 22:43:54 S 06 26 34.078 +12 52 37.27 V C57
2021-12-01 22:43:54 s 1 -145252.79 9 +24684.269 5650.0 C57
2021-12-01 22:53:54 S 06 26 33.569 +12 52 36.34 V C57
2021-12-01 22:53:54 s 1 -144824.64 9 +23688.232 5520.0 C57
2021-12-01 23:03:54 S 06 26 33.156 +12 52 38.28 V C57
2021-12-01 23:03:54 s 1 -144391.19 0 +22691.318 4240.0 C57
2021-12-01 23:13:54 S 06 26 32.477 +12 52 38.03 V C57
2021-12-01 23:13:54 s 1 -143952.37 5 +21693.555 1630.0 C57
2021-12-01 23:33:54 S 06 26 31.661 +12 52 38.03 V C57
2021-12-01 23:33:54 s 1 -143058.48 9 +19695.592 1710.0 C57
2021-12-01 23:43:54 S 06 26 31.145 +12 52 39.29 V C57
2021-12-01 23:43:54 s 1 -142603.32 2 +18695.450 4030.0 C57
2021-12-01 23:53:54 S 06 26 30.758 +12 52 40.26 V C57
2021-12-01 23:53:54 s 1 -142142.60 8 +17694.572 4290.0 C57
2021-12-02 00:03:54 S 06 26 30.221 +12 52 40.33 V C57
2021-12-02 00:03:54 s 1 -141676.29 9 +16692.990 2310.0 C57
2021-12-02 00:13:54 S 06 26 29.743 +12 52 40.69 V C57
2021-12-02 00:13:54 s 1 -141204.34 5 +15690.736 7890.0 C57
2021-12-02 00:33:54 S 06 26 28.759 +12 52 41.09 V C57
2021-12-02 00:33:54 s 1 -140243.30 4 +13684.338 1010.0 C57
2021-12-02 00:43:54 S 06 26 28.318 +12 52 41.59 V C57
2021-12-02 00:43:54 s 1 -139754.11 6 +12680.262 8160.0 C57
2021-12-02 00:53:54 S 06 26 27.878 +12 52 42.06 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)