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
2021-09-22 03:43:58 S 06 26 20.623 +15 02 17.52 V C57
2021-09-22 03:43:58 s 1 +18897.536 0 +368168.28 940.0 C57
2021-09-22 03:53:58 S 06 26 21.149 +15 02 14.75 V C57
2021-09-22 03:53:58 s 1 +18519.744 0 +368245.35 3370.0 C57
2021-09-22 04:03:58 S 06 26 21.626 +15 02 12.26 V C57
2021-09-22 04:03:58 s 1 +18141.894 0 +368321.35 5680.0 C57
2021-09-22 04:13:58 S 06 26 21.941 +15 02 12.95 V C57
2021-09-22 04:13:58 s 1 +17763.988 0 +368396.28 7860.0 C57
2021-09-22 04:23:58 S 06 26 22.416 +15 02 12.84 V C57
2021-09-22 04:23:58 s 1 +17386.028 0 +368470.14 9920.0 C57
2021-09-22 04:33:58 S 06 26 23.002 +15 02 12.12 V C57
2021-09-22 04:33:58 s 1 +17008.013 0 +368542.94 1870.0 C57
2021-09-22 04:43:58 S 06 26 23.287 +15 02 10.39 V C57
2021-09-22 04:43:58 s 1 +16629.946 0 +368614.68 3710.0 C57
2021-09-22 04:53:58 S 06 26 23.650 +15 02 10.07 V C57
2021-09-22 04:53:58 s 1 +16251.828 0 +368685.34 5440.0 C57
2021-09-22 05:03:58 S 06 26 24.269 +15 02 06.40 V C57
2021-09-22 05:03:58 s 1 +15873.659 0 +368754.95 7060.0 C57
2021-09-22 06:03:58 S 06 26 26.818 +15 02 00.46 V C57
2021-09-22 06:03:58 s 1 +13603.649 0 +369150.20 4810.0 C57
2021-09-22 06:13:58 S 06 26 27.269 +15 01 56.32 V C57
2021-09-22 06:13:58 s 1 +13225.158 0 +369212.35 5810.0 C57
2021-09-22 06:23:58 S 06 26 27.595 +15 01 57.04 V C57
2021-09-22 06:23:58 s 1 +12846.625 0 +369273.44 6730.0 C57
2021-09-22 06:33:58 S 06 26 28.296 +15 01 57.90 V C57
2021-09-22 06:33:58 s 1 +12468.052 0 +369333.46 7580.0 C57
2021-09-22 06:43:58 S 06 26 28.570 +15 01 53.44 V C57
2021-09-22 06:43:58 s 1 +12089.439 0 +369392.42 8360.0 C57
2021-09-22 06:53:58 S 06 26 29.045 +15 01 53.36 V C57
2021-09-22 06:53:58 s 1 +11710.789 0 +369450.32 9070.0 C57
2021-09-22 07:03:58 S 06 26 29.539 +15 01 51.56 V C57
2021-09-22 07:03:58 s 1 +11332.100 0 +369507.16 9730.0 C57
2021-09-22 07:13:58 S 06 26 29.914 +15 01 50.45 V C57
2021-09-22 07:13:58 s 1 +10953.376 0 +369562.93 330.0 C57
2021-09-22 07:23:58 S 06 26 30.254 +15 01 48.61 V C57
2021-09-22 07:23:58 s 1 +10574.617 0 +369617.64 880.0 C57
2021-09-22 08:03:58 S 06 26 31.889 +15 01 41.34 V C57
2021-09-22 08:13:58 S 06 26 32.527 +15 01 44.72 V C57
2021-09-22 08:33:58 S 06 26 33.336 +15 01 42.82 V C57
2021-09-22 08:43:58 S 06 26 33.895 +15 01 40.22 V C57
2021-09-22 08:53:58 S 06 26 34.171 +15 01 38.50 V C57
2021-09-22 09:03:58 S 06 26 34.745 +15 01 36.70 V C57
2021-09-22 09:13:58 S 06 26 35.234 +15 01 36.55 V C57
2021-09-22 09:23:58 S 06 26 35.640 +15 01 38.64 V C57
2021-09-22 09:43:58 S 06 26 36.420 +15 01 33.13 V C57
2021-09-22 09:53:58 S 06 26 36.869 +15 01 32.70 V C57
2021-09-22 10:03:58 S 06 26 37.284 +15 01 31.33 V C57
2021-09-22 10:53:58 S 06 26 39.389 +15 01 25.14 V C57
2021-09-22 11:03:58 S 06 26 39.809 +15 01 23.09 V C57
2021-09-22 11:13:58 S 06 26 40.315 +15 01 20.32 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)