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 02:03:58 s 1 +167520.52 6 +218733.08 1710.0 C57
2021-10-02 02:13:58 S 06 36 09.108 +14 33 58.07 V C57
2021-10-02 02:13:58 s 1 +167345.42 7 +219347.39 2060.0 C57
2021-10-02 02:23:58 S 06 36 09.430 +14 33 57.20 V C57
2021-10-02 02:23:58 s 1 +167169.25 4 +219960.27 8940.0 C57
2021-10-02 02:33:58 S 06 36 09.775 +14 33 55.44 V C57
2021-10-02 02:33:58 s 1 +166992.01 1 +220571.73 2360.0 C57
2021-10-02 03:13:58 S 06 36 11.071 +14 33 47.02 V C57
2021-10-02 03:13:58 s 1 +166272.44 8 +223003.33 1860.0 C57
2021-10-02 03:33:58 S 06 36 11.827 +14 33 49.64 V C57
2021-10-02 03:33:58 s 1 +165906.38 5 +224210.61 1340.0 C57
2021-10-02 03:53:58 S 06 36 12.475 +14 33 47.70 V C57
2021-10-02 03:53:58 s 1 +165536.18 9 +225412.25 7480.0 C57
2021-10-02 04:03:58 S 06 36 12.818 +14 33 42.70 V C57
2021-10-02 04:03:58 s 1 +165349.55 3 +226010.94 590.0 C57
2021-10-02 04:13:58 S 06 36 13.344 +14 33 44.10 V C57
2021-10-02 04:13:58 s 1 +165161.90 0 +226608.23 410.0 C57
2021-10-02 04:23:58 S 06 36 13.630 +14 33 42.01 V C57
2021-10-02 04:23:58 s 1 +164973.23 3 +227204.11 6960.0 C57
2021-10-02 04:33:58 S 06 36 13.937 +14 33 43.31 V C57
2021-10-02 04:33:58 s 1 +164783.55 8 +227798.58 270.0 C57
2021-10-02 04:43:58 S 06 36 14.177 +14 33 38.16 V C57
2021-10-02 04:43:58 s 1 +164592.88 0 +228391.65 330.0 C57
2021-10-02 04:53:58 S 06 36 14.750 +14 33 39.56 V C57
2021-10-02 04:53:58 s 1 +164401.20 3 +228983.31 7180.0 C57
2021-10-02 05:53:58 S 06 36 16.584 +14 33 34.38 V C57
2021-10-02 05:53:58 s 1 +163230.44 5 +232503.88 1500.0 C57
2021-10-02 06:03:58 S 06 36 17.148 +14 33 29.41 V C57
2021-10-02 06:03:58 s 1 +163031.91 3 +233085.76 6240.0 C57
2021-10-02 06:13:58 S 06 36 17.369 +14 33 28.26 V C57
2021-10-02 06:13:58 s 1 +162832.42 1 +233666.24 7880.0 C57
2021-10-02 06:23:58 S 06 36 17.770 +14 33 28.01 V C57
2021-10-02 06:23:58 s 1 +162631.97 4 +234245.33 6440.0 C57
2021-10-02 06:33:58 S 06 36 18.134 +14 33 27.22 V C57
2021-10-02 06:33:58 s 1 +162430.57 5 +234823.04 1940.0 C57
2021-10-02 06:43:58 S 06 36 18.410 +14 33 26.03 V C57
2021-10-02 06:43:58 s 1 +162228.22 9 +235399.35 4390.0 C57
2021-10-02 06:53:58 S 06 36 18.898 +14 33 23.26 V C57
2021-10-02 06:53:58 s 1 +162024.94 1 +235974.28 3800.0 C57
2021-10-02 07:03:58 S 06 36 19.265 +14 33 25.42 V C57
2021-10-02 07:03:58 s 1 +161820.71 6 +236547.83 190.0 C57
2021-10-02 07:13:58 S 06 36 19.313 +14 33 22.68 V C57
2021-10-02 07:13:58 s 1 +161615.55 8 +237119.99 3570.0 C57
2021-10-02 08:13:58 S 06 36 21.634 +14 33 16.34 V C57
2021-10-02 08:13:58 s 1 +160365.26 3 +240523.98 1540.0 C57
2021-10-02 08:23:58 S 06 36 21.905 +14 33 13.82 V C57
2021-10-02 08:23:58 s 1 +160153.69 7 +241086.50 4280.0 C57
2021-10-02 08:33:58 S 06 36 22.226 +14 33 13.46 V C57
2021-10-02 08:33:58 s 1 +159941.23 4 +241647.64 4130.0 C57
2021-10-02 08:43:58 S 06 36 22.476 +14 33 12.06 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)