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
2021-09-18 18:03:58 s 1 +167259.41 2 +190112.91 6980.0 C57
2021-09-18 18:13:58 S 06 22 35.885 +15 11 20.94 V C57
2021-09-18 18:13:58 s 1 +167127.15 3 +190802.52 8120.0 C57
2021-09-18 18:23:58 S 06 22 36.302 +15 11 24.14 V C57
2021-09-18 18:23:58 s 1 +166993.51 9 +191490.56 4750.0 C57
2021-09-18 18:33:58 S 06 22 36.792 +15 11 21.55 V C57
2021-09-18 18:33:58 s 1 +166858.51 7 +192177.02 6890.0 C57
2021-09-18 18:43:58 S 06 22 37.318 +15 11 21.34 V C57
2021-09-18 18:43:58 s 1 +166722.15 7 +192861.91 4580.0 C57
2021-09-18 18:53:58 S 06 22 37.685 +15 11 19.97 V C57
2021-09-18 18:53:58 s 1 +166584.44 4 +193545.23 7830.0 C57
2021-09-18 19:03:58 S 06 22 38.232 +15 11 18.46 V C57
2021-09-18 19:03:58 s 1 +166445.38 6 +194226.98 6670.0 C57
2021-09-18 19:13:58 S 06 22 38.791 +15 11 18.02 V C57
2021-09-18 19:13:58 s 1 +166304.99 1 +194907.17 1130.0 C57
2021-09-18 19:23:58 S 06 22 39.247 +15 11 16.62 V C57
2021-09-18 19:23:58 s 1 +166163.26 6 +195585.79 1220.0 C57
2021-09-18 19:33:58 S 06 22 39.934 +15 11 14.17 V C57
2021-09-18 19:33:58 s 1 +166020.21 8 +196262.84 6970.0 C57
2021-09-18 19:43:58 S 06 22 40.198 +15 11 15.50 V C57
2021-09-18 19:43:58 s 1 +165875.85 5 +196938.34 8410.0 C57
2021-09-18 20:03:58 S 06 22 41.359 +15 11 11.76 V C57
2021-09-18 20:03:58 s 1 +165583.21 0 +198284.65 8450.0 C57
2021-09-18 20:23:58 S 06 22 42.139 +15 11 07.33 V C57
2021-09-18 20:23:58 s 1 +165285.38 8 +199624.74 1510.0 C57
2021-09-18 20:33:58 S 06 22 42.718 +15 11 09.02 V C57
2021-09-18 20:33:58 s 1 +165134.55 3 +200292.46 1730.0 C57
2021-09-18 20:43:58 S 06 22 42.876 +15 11 06.83 V C57
2021-09-18 20:43:58 s 1 +164982.44 5 +200958.63 7780.0 C57
2021-09-18 20:53:58 S 06 22 43.481 +15 11 07.40 V C57
2021-09-18 20:53:58 s 1 +164829.07 1 +201623.25 9680.0 C57
2021-09-18 21:03:58 S 06 22 43.975 +15 11 07.08 V C57
2021-09-18 21:03:58 s 1 +164674.43 6 +202286.32 7450.0 C57
2021-09-18 21:13:58 S 06 22 44.549 +15 11 07.44 V C57
2021-09-18 21:13:58 s 1 +164518.54 9 +202947.85 1110.0 C57
2021-09-18 21:23:58 S 06 22 45.038 +15 11 06.14 V C57
2021-09-18 21:23:58 s 1 +164361.41 6 +203607.83 690.0 C57
2021-09-18 21:33:58 S 06 22 45.557 +15 11 03.01 V C57
2021-09-18 21:33:58 s 1 +164203.04 3 +204266.27 6200.0 C57
2021-09-18 21:43:58 S 06 22 45.823 +15 11 02.69 V C57
2021-09-18 21:43:58 s 1 +164043.43 8 +204923.18 7680.0 C57
2021-09-18 21:53:58 S 06 22 46.483 +15 11 05.32 V C57
2021-09-18 21:53:58 s 1 +163882.60 6 +205578.54 5140.0 C57
2021-09-18 22:03:58 S 06 22 46.831 +15 10 59.92 V C57
2021-09-18 22:03:58 s 1 +163720.55 4 +206232.37 8600.0 C57
2021-09-18 22:33:58 S 06 22 48.394 +15 10 57.04 V C57
2021-09-18 22:33:58 s 1 +163227.14 7 +208184.67 5210.0 C57
2021-09-18 22:43:58 S 06 22 48.708 +15 10 56.14 V C57
2021-09-18 22:43:58 s 1 +163060.28 1 +208832.37 2900.0 C57
2021-09-18 22:53:58 S 06 22 49.363 +15 10 54.52 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)