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
2021-11-08 15:23:55 S 06 46 05.230 +13 00 52.63 V C57
2021-11-08 15:23:55 s 1 +174757.41 5 +133438.68 4710.0 C57
2021-11-08 15:43:55 S 06 46 04.877 +13 00 53.28 V C57
2021-11-08 15:43:55 s 1 +174834.39 2 +135033.94 4340.0 C57
2021-11-08 17:13:55 S 06 46 03.523 +13 00 47.09 V C57
2021-11-08 17:13:55 s 1 +175079.04 0 +142133.42 4760.0 C57
2021-11-08 17:23:55 S 06 46 03.367 +13 00 48.06 V C57
2021-11-08 17:23:55 s 1 +175096.20 0 +142914.27 9550.0 C57
2021-11-08 17:33:55 S 06 46 03.223 +13 00 47.84 V C57
2021-11-08 17:33:55 s 1 +175111.39 9 +143693.53 7460.0 C57
2021-11-08 17:43:55 S 06 46 03.101 +13 00 46.84 V C57
2021-11-08 17:43:55 s 1 +175124.65 1 +144471.21 8520.0 C57
2021-11-08 17:53:55 S 06 46 02.957 +13 00 45.43 V C57
2021-11-08 17:53:55 s 1 +175135.96 7 +145247.30 2770.0 C57
2021-11-08 18:03:55 S 06 46 02.731 +13 00 46.19 V C57
2021-11-08 18:03:55 s 1 +175145.36 0 +146021.80 260.0 C57
2021-11-08 19:33:55 S 06 46 01.320 +13 00 41.90 V C57
2021-11-08 19:33:55 s 1 +175145.21 4 +152921.11 150.0 C57
2021-11-08 19:43:55 S 06 46 01.094 +13 00 41.22 V C57
2021-11-08 19:43:55 s 1 +175135.99 4 +153679.82 2250.0 C57
2021-11-08 20:13:55 S 06 46 00.646 +13 00 40.97 V C57
2021-11-08 20:13:55 s 1 +175097.57 7 +155946.52 780.0 C57
2021-11-08 20:23:55 S 06 46 00.442 +13 00 40.68 V C57
2021-11-08 20:23:55 s 1 +175081.21 9 +156698.96 7830.0 C57
2021-11-08 21:53:55 S 06 45 59.119 +13 00 36.86 V C57
2021-11-08 21:53:55 s 1 +174856.10 1 +163400.62 7780.0 C57
2021-11-08 22:13:55 S 06 45 58.913 +13 00 35.14 V C57
2021-11-08 22:13:55 s 1 +174787.47 1 +164872.79 5830.0 C57
2021-11-08 22:23:55 S 06 45 58.558 +13 00 34.60 V C57
2021-11-08 22:23:55 s 1 +174750.67 7 +165606.55 1160.0 C57
2021-11-08 22:33:55 S 06 45 58.363 +13 00 33.48 V C57
2021-11-08 22:33:55 s 1 +174712.24 4 +166338.76 740.0 C57
2021-11-08 22:43:55 S 06 45 58.294 +13 00 34.60 V C57
2021-11-08 22:43:55 s 1 +174672.18 0 +167069.44 4600.0 C57
2021-11-08 22:53:55 S 06 45 58.133 +13 00 33.88 V C57
2021-11-08 22:53:55 s 1 +174630.49 5 +167798.57 2780.0 C57
2021-11-08 23:03:55 S 06 45 57.998 +13 00 33.70 V C57
2021-11-08 23:03:55 s 1 +174587.19 8 +168526.16 5310.0 C57
2021-11-09 12:05:49 C 06 45 31.69 +12 58 26.7 V T05
2021-11-09 12:08:27 C 06 45 31.64 +12 58 26.4 V T05
2021-11-09 12:36:07 C 06 45 31.10 +12 58 25.0 V T05
2021-11-09 12:58:36 C 06 45 30.66 +12 58 23.7 V T05
2021-11-10 12:43:55 S 06 45 15.655 +12 58 41.41 V C57
2021-11-10 12:43:55 s 1 +135918.01 3 +296890.11 7080.0 C57
2021-11-10 17:33:55 S 06 45 09.672 +12 58 26.83 V C57
2021-11-10 17:33:55 s 1 +128158.63 4 +308656.92 9160.0 C57
2021-11-10 19:53:55 S 06 45 06.662 +12 58 19.20 V C57
2021-11-10 19:53:55 s 1 +124264.45 5 +313989.13 8460.0 C57
2021-11-10 20:03:55 S 06 45 06.458 +12 58 18.80 V C57
2021-11-10 20:03:55 s 1 +123982.83 1 +314361.43 3770.0 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)