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
2021-10-06 09:13:57 s 1 -33951.930 0 +367462.92 5940.0 C57
2021-10-06 09:23:57 S 06 39 23.858 +14 21 03.28 V C57
2021-10-06 09:23:57 s 1 -34320.136 0 +367365.41 9970.0 C57
2021-10-06 10:53:57 S 06 39 26.369 +14 20 51.97 V C57
2021-10-06 10:53:57 s 1 -37628.932 0 +366440.39 7380.0 C57
2021-10-06 11:03:58 S 06 39 26.734 +14 20 50.78 V C57
2021-10-06 11:03:58 s 1 -37995.994 0 +366332.33 7150.0 C57
2021-10-06 11:13:57 S 06 39 26.902 +14 20 47.94 V C57
2021-10-06 11:13:57 s 1 -38362.935 0 +366223.22 6470.0 C57
2021-10-06 11:23:58 S 06 39 27.202 +14 20 48.05 V C57
2021-10-06 11:23:58 s 1 -38729.754 0 +366113.05 5350.0 C57
2021-10-06 11:33:57 S 06 39 27.485 +14 20 47.11 V C57
2021-10-06 11:33:57 s 1 -39096.450 0 +366001.83 3780.0 C57
2021-10-06 11:43:58 S 06 39 27.833 +14 20 44.20 V C57
2021-10-06 11:43:58 s 1 -39463.023 0 +365889.55 1740.0 C57
2021-10-06 11:53:57 S 06 39 27.929 +14 20 41.39 V C57
2021-10-06 11:53:57 s 1 -39829.470 0 +365776.21 9250.0 C57
2021-10-06 12:53:58 S 06 39 29.674 +14 20 34.04 V C57
2021-10-06 12:53:58 s 1 -42025.469 0 +365073.98 4400.0 C57
2021-10-06 13:03:57 S 06 39 30.166 +14 20 32.06 V C57
2021-10-06 13:03:57 s 1 -42391.011 0 +364953.24 8570.0 C57
2021-10-06 13:13:58 S 06 39 30.482 +14 20 31.60 V C57
2021-10-06 13:13:58 s 1 -42756.419 0 +364831.43 2260.0 C57
2021-10-06 13:33:57 S 06 39 31.046 +14 20 30.70 V C57
2021-10-06 13:33:57 s 1 -43486.828 0 +364584.65 8140.0 C57
2021-10-06 13:43:57 S 06 39 31.284 +14 20 31.56 V C57
2021-10-06 13:43:57 s 1 -43851.827 0 +364459.68 330.0 C57
2021-10-06 13:53:57 S 06 39 31.531 +14 20 28.32 V C57
2021-10-06 13:53:57 s 1 -44216.688 0 +364333.64 2020.0 C57
2021-10-06 14:03:58 S 06 39 31.778 +14 20 27.06 V C57
2021-10-06 14:03:58 s 1 -44581.410 0 +364206.54 3190.0 C57
2021-10-06 14:13:57 S 06 39 32.244 +14 20 24.43 V C57
2021-10-06 14:13:57 s 1 -44945.991 0 +364078.38 3850.0 C57
2021-10-06 14:23:58 S 06 39 32.342 +14 20 24.97 V C57
2021-10-06 14:23:58 s 1 -45310.430 0 +363949.16 4000.0 C57
2021-10-06 15:53:58 S 06 39 34.954 +14 20 12.88 V C57
2021-10-06 15:53:58 s 1 -48583.813 0 +362738.40 1410.0 C57
2021-10-06 16:03:57 S 06 39 35.141 +14 20 09.49 V C57
2021-10-06 16:03:57 s 1 -48946.772 0 +362598.56 6170.0 C57
2021-10-06 16:13:58 S 06 39 35.422 +14 20 09.78 V C57
2021-10-06 16:13:58 s 1 -49309.576 0 +362457.65 370.0 C57
2021-10-06 16:23:57 S 06 39 35.652 +14 20 06.68 V C57
2021-10-06 16:23:57 s 1 -49672.225 0 +362315.68 4020.0 C57
2021-10-06 16:33:57 S 06 39 36.002 +14 20 04.56 V C57
2021-10-06 16:33:57 s 1 -50034.717 0 +362172.64 7090.0 C57
2021-10-06 16:43:57 S 06 39 36.432 +14 20 05.89 V C57
2021-10-06 16:43:57 s 1 -50397.052 0 +362028.54 9590.0 C57
2021-10-06 18:13:57 S 06 39 38.933 +14 19 52.75 V C57
2021-10-06 18:13:57 s 1 -53650.770 0 +360683.68 5790.0 C57
2021-10-06 18:23:57 S 06 39 39.202 +14 19 50.48 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)