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
2021-11-25 04:23:55 s 1 +70342.805 0 +364829.05 6500.0 C57
2021-11-25 04:33:55 S 06 34 19.558 +12 50 52.91 V C57
2021-11-25 04:33:55 s 1 +70005.848 0 +365010.78 8990.0 C57
2021-11-25 04:43:55 S 06 34 19.042 +12 50 52.91 V C57
2021-11-25 04:43:55 s 1 +69668.696 0 +365191.48 890.0 C57
2021-11-25 04:53:55 S 06 34 18.679 +12 50 52.62 V C57
2021-11-25 04:53:55 s 1 +69331.352 0 +365371.16 2200.0 C57
2021-11-25 05:03:55 S 06 34 18.180 +12 50 52.04 V C57
2021-11-25 05:03:55 s 1 +68993.815 0 +365549.83 2940.0 C57
2021-11-25 05:13:55 S 06 34 17.741 +12 50 53.12 V C57
2021-11-25 05:13:55 s 1 +68656.087 0 +365727.47 3100.0 C57
2021-11-25 05:23:55 S 06 34 17.326 +12 50 52.40 V C57
2021-11-25 05:23:55 s 1 +68318.170 0 +365904.09 2700.0 C57
2021-11-25 05:33:55 S 06 34 16.841 +12 50 52.55 V C57
2021-11-25 05:33:55 s 1 +67980.064 0 +366079.70 1730.0 C57
2021-11-25 05:43:55 S 06 34 16.476 +12 50 54.10 V C57
2021-11-25 05:43:55 s 1 +67641.770 0 +366254.28 200.0 C57
2021-11-25 05:53:55 S 06 34 16.051 +12 50 52.22 V C57
2021-11-25 05:53:55 s 1 +67303.290 0 +366427.85 8110.0 C57
2021-11-25 06:03:55 S 06 34 15.494 +12 50 52.76 V C57
2021-11-25 06:03:55 s 1 +66964.625 0 +366600.39 5470.0 C57
2021-11-25 06:13:55 S 06 34 15.122 +12 50 54.06 V C57
2021-11-25 06:13:55 s 1 +66625.775 0 +366771.92 2280.0 C57
2021-11-25 06:23:55 S 06 34 14.688 +12 50 52.44 V C57
2021-11-25 06:23:55 s 1 +66286.743 0 +366942.44 8550.0 C57
2021-11-25 06:33:55 S 06 34 14.330 +12 50 52.91 V C57
2021-11-25 06:33:55 s 1 +65947.528 0 +367111.93 4280.0 C57
2021-11-25 06:43:55 S 06 34 13.680 +12 50 51.47 V C57
2021-11-25 06:43:55 s 1 +65608.133 0 +367280.41 9470.0 C57
2021-11-25 06:53:55 S 06 34 13.454 +12 50 53.23 V C57
2021-11-25 06:53:55 s 1 +65268.557 0 +367447.87 4130.0 C57
2021-11-25 07:03:55 S 06 34 12.934 +12 50 52.84 V C57
2021-11-25 07:03:55 s 1 +64928.803 0 +367614.32 8270.0 C57
2021-11-25 07:13:54 S 06 34 12.442 +12 50 53.70 V C57
2021-11-25 07:13:54 s 1 +64588.872 0 +367779.75 1880.0 C57
2021-11-25 07:23:55 S 06 34 12.070 +12 50 53.38 V C57
2021-11-25 07:23:55 s 1 +64248.764 0 +367944.16 4970.0 C57
2021-11-25 07:33:55 S 06 34 11.640 +12 50 51.86 V C57
2021-11-25 07:33:55 s 1 +63908.481 0 +368107.56 7550.0 C57
2021-11-25 07:43:55 S 06 34 11.119 +12 50 53.81 V C57
2021-11-25 07:43:55 s 1 +63568.023 0 +368269.95 9620.0 C57
2021-11-25 07:53:55 S 06 34 10.723 +12 50 53.34 V C57
2021-11-25 07:53:55 s 1 +63227.392 0 +368431.32 1180.0 C57
2021-11-25 08:03:55 S 06 34 10.310 +12 50 53.48 V C57
2021-11-25 08:03:55 s 1 +62886.589 0 +368591.67 2230.0 C57
2021-11-25 08:13:55 S 06 34 09.799 +12 50 53.30 V C57
2021-11-25 08:13:55 s 1 +62545.615 0 +368751.01 2790.0 C57
2021-11-25 08:23:55 S 06 34 09.355 +12 50 52.98 V C57
2021-11-25 08:23:55 s 1 +62204.471 0 +368909.34 2860.0 C57
2021-11-25 08:33:55 S 06 34 08.964 +12 50 52.66 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)