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
2021-11-23 13:33:55 s 1 +140737.44 4 +293530.72 2220.0 C57
2021-11-23 13:43:55 S 06 35 57.991 +12 50 47.22 V C57
2021-11-23 13:43:55 s 1 +140484.10 7 +293966.20 4420.0 C57
2021-11-23 13:53:55 S 06 35 57.727 +12 50 46.82 V C57
2021-11-23 13:53:55 s 1 +140230.20 0 +294400.50 4630.0 C57
2021-11-23 14:03:55 S 06 35 57.137 +12 50 47.36 V C57
2021-11-23 14:03:55 s 1 +139975.72 6 +294833.62 2880.0 C57
2021-11-23 14:13:55 S 06 35 56.705 +12 50 46.10 V C57
2021-11-23 14:13:55 s 1 +139720.68 8 +295265.55 9160.0 C57
2021-11-23 14:23:55 S 06 35 56.417 +12 50 46.21 V C57
2021-11-23 14:23:55 s 1 +139465.08 7 +295696.30 3490.0 C57
2021-11-23 14:33:55 S 06 35 55.992 +12 50 46.28 V C57
2021-11-23 14:33:55 s 1 +139208.92 7 +296125.88 5880.0 C57
2021-11-23 14:43:55 S 06 35 55.471 +12 50 46.97 V C57
2021-11-23 14:43:55 s 1 +138952.20 9 +296554.27 6330.0 C57
2021-11-23 14:53:55 S 06 35 55.171 +12 50 47.54 V C57
2021-11-23 14:53:55 s 1 +138694.93 6 +296981.49 4860.0 C57
2021-11-23 15:03:55 S 06 35 54.792 +12 50 47.29 V C57
2021-11-23 15:03:55 s 1 +138437.11 1 +297407.53 1470.0 C57
2021-11-23 15:13:55 S 06 35 54.341 +12 50 46.90 V C57
2021-11-23 15:13:55 s 1 +138178.73 4 +297832.39 6170.0 C57
2021-11-23 15:23:55 S 06 35 53.868 +12 50 47.00 V C57
2021-11-23 15:23:55 s 1 +137919.81 0 +298256.08 8970.0 C57
2021-11-23 15:33:55 S 06 35 53.498 +12 50 46.18 V C57
2021-11-23 15:33:55 s 1 +137660.34 0 +298678.60 9880.0 C57
2021-11-23 15:43:55 S 06 35 53.062 +12 50 47.04 V C57
2021-11-23 15:43:55 s 1 +137400.32 6 +299099.94 8900.0 C57
2021-11-23 15:53:55 S 06 35 52.598 +12 50 46.43 V C57
2021-11-23 15:53:55 s 1 +137139.77 2 +299520.11 6050.0 C57
2021-11-23 16:03:55 S 06 35 52.246 +12 50 46.97 V C57
2021-11-23 16:03:55 s 1 +136878.67 8 +299939.12 1330.0 C57
2021-11-23 16:13:55 S 06 35 51.943 +12 50 46.79 V C57
2021-11-23 16:13:55 s 1 +136617.04 7 +300356.95 4750.0 C57
2021-11-23 16:23:55 S 06 35 51.456 +12 50 47.26 V C57
2021-11-23 16:23:55 s 1 +136354.88 2 +300773.61 6330.0 C57
2021-11-23 16:33:55 S 06 35 51.024 +12 50 47.51 V C57
2021-11-23 16:33:55 s 1 +136092.18 5 +301189.11 6060.0 C57
2021-11-23 16:43:55 S 06 35 50.594 +12 50 45.82 V C57
2021-11-23 16:43:55 s 1 +135828.95 7 +301603.44 3950.0 C57
2021-11-23 16:53:55 S 06 35 50.234 +12 50 47.69 V C57
2021-11-23 16:53:55 s 1 +135565.20 2 +302016.60 20.0 C57
2021-11-23 17:03:55 S 06 35 49.762 +12 50 47.29 V C57
2021-11-23 17:03:55 s 1 +135300.92 2 +302428.61 4280.0 C57
2021-11-23 17:13:55 S 06 35 49.486 +12 50 47.76 V C57
2021-11-23 17:13:55 s 1 +135036.11 8 +302839.44 6720.0 C57
2021-11-23 17:23:55 S 06 35 49.020 +12 50 47.83 V C57
2021-11-23 17:23:55 s 1 +134770.79 2 +303249.12 7360.0 C57
2021-11-23 17:33:55 S 06 35 48.545 +12 50 47.72 V C57
2021-11-23 17:33:55 s 1 +134504.94 8 +303657.63 6210.0 C57
2021-11-23 17:43:55 S 06 35 48.149 +12 50 46.32 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)