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
2021-11-16 19:53:55 S 06 41 14.136 +12 51 05.54 V C57
2021-11-16 19:53:55 s 1 -152057.67 8 +245348.13 3610.0 C57
2021-11-16 20:03:55 S 06 41 13.829 +12 51 06.08 V C57
2021-11-16 20:03:55 s 1 -152258.71 1 +244784.80 5950.0 C57
2021-11-16 20:13:55 S 06 41 13.421 +12 51 05.29 V C57
2021-11-16 20:13:55 s 1 -152458.88 8 +244220.09 4850.0 C57
2021-11-16 20:23:55 S 06 41 13.222 +12 51 05.22 V C57
2021-11-16 20:23:55 s 1 -152658.20 5 +243654.00 300.0 C57
2021-11-16 20:33:55 S 06 41 12.943 +12 51 05.11 V C57
2021-11-16 20:33:55 s 1 -152856.65 7 +243086.53 2290.0 C57
2021-11-16 21:33:55 S 06 41 11.016 +12 51 02.56 V C57
2021-11-16 21:33:55 s 1 -154028.98 2 +239652.58 600.0 C57
2021-11-16 21:43:55 S 06 41 10.718 +12 51 02.84 V C57
2021-11-16 21:43:55 s 1 -154221.26 4 +239075.38 7880.0 C57
2021-11-16 21:53:55 S 06 41 10.423 +12 51 02.16 V C57
2021-11-16 21:53:55 s 1 -154412.64 7 +238496.79 1580.0 C57
2021-11-16 22:03:55 S 06 41 10.092 +12 51 00.79 V C57
2021-11-16 22:03:55 s 1 -154603.12 6 +237916.80 1650.0 C57
2021-11-16 22:13:55 S 06 41 09.782 +12 51 00.22 V C57
2021-11-16 22:13:55 s 1 -154792.69 7 +237335.41 8100.0 C57
2021-11-16 22:23:55 S 06 41 09.446 +12 51 00.40 V C57
2021-11-16 22:23:55 s 1 -154981.35 6 +236752.62 900.0 C57
2021-11-16 22:33:55 S 06 41 09.127 +12 50 59.32 V C57
2021-11-16 22:33:55 s 1 -155169.09 8 +236168.43 40.0 C57
2021-11-16 22:43:55 S 06 41 08.844 +12 50 59.93 V C57
2021-11-16 22:43:55 s 1 -155355.91 8 +235582.83 5490.0 C57
2021-11-16 22:53:55 S 06 41 08.580 +12 50 59.10 V C57
2021-11-16 22:53:55 s 1 -155541.81 1 +234995.82 7250.0 C57
2021-11-17 00:03:55 S 06 41 06.401 +12 50 56.18 V C57
2021-11-17 00:03:55 s 1 -156816.74 0 +230847.22 4420.0 C57
2021-11-17 00:13:55 S 06 41 06.065 +12 50 56.04 V C57
2021-11-17 00:13:55 s 1 -156995.05 4 +230248.89 5920.0 C57
2021-11-17 00:15:33 C 06 41 13.27 +12 50 55.2 V 089
2021-11-17 00:18:10 C 06 41 13.19 +12 50 55.3 V 089
2021-11-17 00:23:55 S 06 41 05.669 +12 50 56.47 V C57
2021-11-17 00:23:55 s 1 -157172.40 0 +229649.14 3560.0 C57
2021-11-17 00:27:33 C 06 41 12.89 +12 50 55.0 V 089
2021-11-17 00:30:09 C 06 41 12.81 +12 50 54.8 V 089
2021-11-17 00:33:55 S 06 41 05.390 +12 50 54.92 V C57
2021-11-17 00:33:55 s 1 -157348.77 2 +229047.96 7330.0 C57
2021-11-17 00:36:56 C 06 41 12.61 +12 50 54.7 V 089
2021-11-17 00:43:55 S 06 41 05.040 +12 50 53.92 V C57
2021-11-17 00:43:55 s 1 -157524.16 4 +228445.35 7190.0 C57
2021-11-17 00:53:55 S 06 41 04.745 +12 50 53.20 V C57
2021-11-17 00:53:55 s 1 -157698.57 3 +227841.32 3130.0 C57
2021-11-17 01:03:55 S 06 41 04.402 +12 50 53.38 V C57
2021-11-17 01:03:55 s 1 -157871.99 4 +227235.85 5130.0 C57
2021-11-17 01:13:55 S 06 41 04.020 +12 50 53.48 V C57
2021-11-17 01:13:55 s 1 -158044.42 0 +226628.95 3170.0 C57
2021-11-17 01:23:55 S 06 41 03.734 +12 50 52.73 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)