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
2021-11-26 01:03:55 s 1 +27411.123 0 +379668.33 6550.0 C57
2021-11-26 01:13:54 S 06 33 24.307 +12 50 55.61 V C57
2021-11-26 01:13:54 s 1 +27058.131 0 +379725.53 6980.0 C57
2021-11-26 01:23:55 S 06 33 23.784 +12 50 56.29 V C57
2021-11-26 01:23:55 s 1 +26705.073 0 +379781.73 7310.0 C57
2021-11-26 01:33:55 S 06 33 23.455 +12 50 55.54 V C57
2021-11-26 01:33:55 s 1 +26351.948 0 +379836.94 7540.0 C57
2021-11-26 01:43:54 S 06 33 22.958 +12 50 55.39 V C57
2021-11-26 01:43:54 s 1 +25998.759 0 +379891.16 7680.0 C57
2021-11-26 01:53:55 S 06 33 22.493 +12 50 55.14 V C57
2021-11-26 01:53:55 s 1 +25645.505 0 +379944.38 7730.0 C57
2021-11-26 02:03:54 S 06 33 22.061 +12 50 55.54 V C57
2021-11-26 02:03:54 s 1 +25292.189 0 +379996.62 7700.0 C57
2021-11-26 02:13:55 S 06 33 21.643 +12 50 56.15 V C57
2021-11-26 02:13:55 s 1 +24938.810 0 +380047.86 7580.0 C57
2021-11-26 02:23:54 S 06 33 21.113 +12 50 56.08 V C57
2021-11-26 02:23:54 s 1 +24585.371 0 +380098.10 7390.0 C57
2021-11-26 02:33:55 S 06 33 20.760 +12 50 55.61 V C57
2021-11-26 02:33:55 s 1 +24231.871 0 +380147.36 7120.0 C57
2021-11-26 02:43:54 S 06 33 20.215 +12 50 56.00 V C57
2021-11-26 02:43:54 s 1 +23878.312 0 +380195.62 6790.0 C57
2021-11-26 02:53:55 S 06 33 19.759 +12 50 56.29 V C57
2021-11-26 02:53:55 s 1 +23524.695 0 +380242.89 6380.0 C57
2021-11-26 03:03:55 S 06 33 19.284 +12 50 55.54 V C57
2021-11-26 03:03:55 s 1 +23171.020 0 +380289.17 5910.0 C57
2021-11-26 03:13:54 S 06 33 18.850 +12 50 56.00 V C57
2021-11-26 03:13:54 s 1 +22817.289 0 +380334.46 4610.0 C57
2021-11-26 03:23:55 S 06 33 18.401 +12 50 56.76 V C57
2021-11-26 03:23:55 s 1 +22463.503 0 +380378.75 5200.0 C57
2021-11-26 03:33:54 S 06 33 18.017 +12 50 56.29 V C57
2021-11-26 03:33:54 s 1 +22109.662 0 +380422.05 5830.0 C57
2021-11-26 03:43:55 S 06 33 17.556 +12 50 56.44 V C57
2021-11-26 03:43:55 s 1 +21755.768 0 +380464.36 6510.0 C57
2021-11-26 03:53:54 S 06 33 17.105 +12 50 55.86 V C57
2021-11-26 03:53:54 s 1 +21401.821 0 +380505.68 7240.0 C57
2021-11-26 04:03:55 S 06 33 16.666 +12 50 54.10 V C57
2021-11-26 04:03:55 s 1 +21047.822 0 +380546.01 8010.0 C57
2021-11-26 04:13:54 S 06 33 16.308 +12 50 55.07 V C57
2021-11-26 04:13:54 s 1 +20693.773 0 +380585.34 8820.0 C57
2021-11-26 04:23:55 S 06 33 15.732 +12 50 55.43 V C57
2021-11-26 04:23:55 s 1 +20339.675 0 +380623.69 9660.0 C57
2021-11-26 04:33:55 S 06 33 15.353 +12 50 56.65 V C57
2021-11-26 04:33:55 s 1 +19985.527 0 +380661.04 520.0 C57
2021-11-26 04:43:54 S 06 33 14.813 +12 50 56.51 V C57
2021-11-26 04:43:54 s 1 +19631.332 0 +380697.40 1420.0 C57
2021-11-26 04:53:55 S 06 33 14.299 +12 50 56.62 V C57
2021-11-26 04:53:55 s 1 +19277.090 0 +380732.77 2340.0 C57
2021-11-26 05:03:54 S 06 33 13.932 +12 50 55.68 V C57
2021-11-26 05:03:54 s 1 +18922.801 0 +380767.14 3280.0 C57
2021-11-26 05:13:55 S 06 33 13.481 +12 50 56.26 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)