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
2021-10-02 15:53:58 s 1 +149764.98 6 +265001.14 4460.0 C57
2021-10-02 16:03:58 S 06 36 37.565 +14 32 19.79 V C57
2021-10-02 16:03:58 s 1 +149516.19 7 +265501.98 7530.0 C57
2021-10-02 16:13:58 S 06 36 37.954 +14 32 20.47 V C57
2021-10-02 16:13:58 s 1 +149266.68 5 +266001.53 8270.0 C57
2021-10-02 16:23:58 S 06 36 38.458 +14 32 17.84 V C57
2021-10-02 16:23:58 s 1 +149016.45 2 +266499.76 6700.0 C57
2021-10-02 16:33:58 S 06 36 38.746 +14 32 16.01 V C57
2021-10-02 16:33:58 s 1 +148765.50 1 +266996.68 2830.0 C57
2021-10-02 18:03:58 S 06 36 41.402 +14 32 05.46 V C57
2021-10-02 18:03:58 s 1 +146475.21 8 +271410.44 6240.0 C57
2021-10-02 18:53:58 S 06 36 43.462 +14 32 02.04 V C57
2021-10-02 18:53:58 s 1 +145178.71 8 +273817.19 3030.0 C57
2021-10-02 19:03:58 S 06 36 43.562 +14 32 00.10 V C57
2021-10-02 19:03:58 s 1 +144917.39 8 +274294.67 5910.0 C57
2021-10-02 19:13:58 S 06 36 44.126 +14 31 55.24 V C57
2021-10-02 19:13:58 s 1 +144655.41 1 +274770.86 6660.0 C57
2021-10-02 20:23:58 S 06 36 46.478 +14 31 51.28 V C57
2021-10-02 20:23:58 s 1 +142803.10 5 +278068.32 2980.0 C57
2021-10-02 20:33:58 S 06 36 46.675 +14 31 48.58 V C57
2021-10-02 20:33:58 s 1 +142535.89 7 +278534.26 7000.0 C57
2021-10-02 20:43:58 S 06 36 47.062 +14 31 47.71 V C57
2021-10-02 20:43:58 s 1 +142268.05 0 +278998.94 8990.0 C57
2021-10-02 20:53:58 S 06 36 47.306 +14 31 45.05 V C57
2021-10-02 20:53:58 s 1 +141999.56 6 +279462.34 8930.0 C57
2021-10-02 21:03:58 S 06 36 47.647 +14 31 43.82 V C57
2021-10-02 21:03:58 s 1 +141730.44 9 +279924.46 6850.0 C57
2021-10-02 21:13:58 S 06 36 48.055 +14 31 44.44 V C57
2021-10-02 21:13:58 s 1 +141460.70 1 +280385.32 2750.0 C57
2021-10-02 21:23:58 S 06 36 48.367 +14 31 41.99 V C57
2021-10-02 21:23:58 s 1 +141190.32 6 +280844.90 6640.0 C57
2021-10-02 22:43:58 S 06 36 50.930 +14 31 35.40 V C57
2021-10-02 22:43:58 s 1 +139005.06 5 +284475.96 6570.0 C57
2021-10-02 22:53:58 S 06 36 51.338 +14 31 33.10 V C57
2021-10-02 22:53:58 s 1 +138729.16 7 +284924.16 2800.0 C57
2021-10-02 23:03:58 S 06 36 51.698 +14 31 31.66 V C57
2021-10-02 23:03:58 s 1 +138452.67 0 +285371.10 7110.0 C57
2021-10-02 23:13:58 S 06 36 52.106 +14 31 29.57 V C57
2021-10-02 23:13:58 s 1 +138175.57 6 +285816.78 9510.0 C57
2021-10-02 23:22:37 S 06 36 42.71 +14 30 07.7 L C51
2021-10-02 23:23:58 S 06 36 52.368 +14 31 29.46 V C57
2021-10-02 23:23:58 s 1 +137897.88 8 +286261.21 20.0 C57
2021-10-02 23:33:58 S 06 36 52.634 +14 31 26.22 V C57
2021-10-02 23:33:58 s 1 +137619.60 8 +286704.38 8630.0 C57
2021-10-02 23:43:58 S 06 36 53.134 +14 31 24.74 V C57
2021-10-02 23:43:58 s 1 +137340.73 9 +287146.30 5360.0 C57
2021-10-02 23:53:58 S 06 36 53.381 +14 31 25.21 V C57
2021-10-02 23:53:58 s 1 +137061.28 4 +287586.96 220.0 C57
2021-10-03 00:03:58 S 06 36 53.794 +14 31 23.34 V C57
2021-10-03 00:03:58 s 1 +136781.24 6 +288026.37 3220.0 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)