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
2021-10-08 05:53:57 s 1 -124799.96 9 +302428.11 1850.0 C57
2021-10-08 06:03:57 S 06 40 37.178 +14 15 02.66 V C57
2021-10-08 06:03:57 s 1 -125092.07 3 +302032.34 8190.0 C57
2021-10-08 06:13:57 S 06 40 37.519 +14 15 01.08 V C57
2021-10-08 06:13:57 s 1 -125383.66 0 +301635.35 2750.0 C57
2021-10-08 06:23:57 S 06 40 37.802 +14 15 01.51 V C57
2021-10-08 06:23:57 s 1 -125674.73 4 +301237.15 5530.0 C57
2021-10-08 06:33:57 S 06 40 37.906 +14 14 59.82 V C57
2021-10-08 06:33:57 s 1 -125965.30 5 +300837.76 6560.0 C57
2021-10-08 06:43:57 S 06 40 38.251 +14 14 59.57 V C57
2021-10-08 06:43:57 s 1 -126255.35 3 +300437.13 5780.0 C57
2021-10-08 06:53:57 S 06 40 38.520 +14 14 57.26 V C57
2021-10-08 06:53:57 s 1 -126544.88 2 +300035.29 3190.0 C57
2021-10-08 07:03:57 S 06 40 38.930 +14 14 53.16 V C57
2021-10-08 07:03:57 s 1 -126833.90 0 +299632.26 8840.0 C57
2021-10-08 08:13:57 S 06 40 40.757 +14 14 47.58 V C57
2021-10-08 08:13:57 s 1 -128842.23 3 +296776.84 7070.0 C57
2021-10-08 08:23:57 S 06 40 40.891 +14 14 46.72 V C57
2021-10-08 08:23:57 s 1 -129127.00 0 +296364.03 7980.0 C57
2021-10-08 08:33:57 S 06 40 41.107 +14 14 42.04 V C57
2021-10-08 08:33:57 s 1 -129411.23 5 +295950.02 7040.0 C57
2021-10-08 08:43:57 S 06 40 41.474 +14 14 44.23 V C57
2021-10-08 08:43:57 s 1 -129694.91 8 +295534.77 4200.0 C57
2021-10-08 08:53:57 S 06 40 41.746 +14 14 40.67 V C57
2021-10-08 08:53:57 s 1 -129978.05 5 +295118.28 9450.0 C57
2021-10-08 09:03:57 S 06 40 41.954 +14 14 39.16 V C57
2021-10-08 09:03:57 s 1 -130260.65 3 +294700.60 2840.0 C57
2021-10-08 09:13:57 S 06 40 42.254 +14 14 38.00 V C57
2021-10-08 09:13:57 s 1 -130542.69 2 +294281.66 4300.0 C57
2021-10-08 09:23:57 S 06 40 42.502 +14 14 36.78 V C57
2021-10-08 09:23:57 s 1 -130824.17 7 +293861.49 3830.0 C57
2021-10-08 10:43:57 S 06 40 44.498 +14 14 23.03 V C57
2021-10-08 10:43:57 s 1 -133055.89 2 +290455.83 250.0 C57
2021-10-08 10:53:57 S 06 40 44.861 +14 14 25.22 V C57
2021-10-08 10:53:57 s 1 -133332.28 9 +290024.54 2160.0 C57
2021-10-08 11:03:57 S 06 40 45.209 +14 14 24.29 V C57
2021-10-08 11:03:57 s 1 -133608.12 0 +289592.04 2110.0 C57
2021-10-08 11:13:57 S 06 40 45.360 +14 14 20.72 V C57
2021-10-08 11:13:57 s 1 -133883.36 1 +289158.28 10.0 C57
2021-10-08 11:23:57 S 06 40 45.624 +14 14 20.72 V C57
2021-10-08 11:23:57 s 1 -134158.01 8 +288723.27 5890.0 C57
2021-10-08 11:33:57 S 06 40 45.974 +14 14 19.54 V C57
2021-10-08 11:33:57 s 1 -134432.10 0 +288287.04 9790.0 C57
2021-10-08 11:43:57 S 06 40 46.150 +14 14 18.85 V C57
2021-10-08 11:43:57 s 1 -134705.58 5 +287849.54 1610.0 C57
2021-10-08 12:53:57 S 06 40 48.026 +14 14 07.84 V C57
2021-10-08 12:53:57 s 1 -136603.30 8 +284752.13 6660.0 C57
2021-10-08 13:13:57 S 06 40 48.449 +14 14 03.88 V C57
2021-10-08 13:13:57 s 1 -137140.07 8 +283855.89 5000.0 C57
2021-10-08 13:23:57 S 06 40 48.751 +14 14 02.33 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)