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
2021-11-23 04:03:55 s 1 +154152.94 8 +266713.28 9840.0 C57
2021-11-23 04:13:55 S 06 36 20.918 +12 50 44.59 V C57
2021-11-23 04:13:55 s 1 +153936.41 4 +267218.20 770.0 C57
2021-11-23 04:23:55 S 06 36 20.414 +12 50 44.59 V C57
2021-11-23 04:23:55 s 1 +153719.15 3 +267721.86 9140.0 C57
2021-11-23 04:33:55 S 06 36 20.078 +12 50 44.34 V C57
2021-11-23 04:33:55 s 1 +153501.16 8 +268224.27 4980.0 C57
2021-11-23 04:43:55 S 06 36 19.788 +12 50 44.63 V C57
2021-11-23 04:43:55 s 1 +153282.46 3 +268725.43 8280.0 C57
2021-11-23 04:53:55 S 06 36 19.318 +12 50 43.76 V C57
2021-11-23 04:53:55 s 1 +153063.04 2 +269225.34 9060.0 C57
2021-11-23 05:03:55 S 06 36 18.907 +12 50 45.24 V C57
2021-11-23 05:03:55 s 1 +152842.90 6 +269724.01 7330.0 C57
2021-11-23 05:13:55 S 06 36 18.504 +12 50 44.70 V C57
2021-11-23 05:13:55 s 1 +152622.06 0 +270221.42 3110.0 C57
2021-11-23 05:23:55 S 06 36 18.091 +12 50 44.88 V C57
2021-11-23 05:23:55 s 1 +152400.50 6 +270717.59 6400.0 C57
2021-11-23 05:33:55 S 06 36 17.772 +12 50 45.56 V C57
2021-11-23 05:33:55 s 1 +152178.24 7 +271212.52 7210.0 C57
2021-11-23 05:43:55 S 06 36 17.294 +12 50 45.20 V C57
2021-11-23 05:43:55 s 1 +151955.28 6 +271706.21 5560.0 C57
2021-11-23 05:53:55 S 06 36 16.922 +12 50 45.49 V C57
2021-11-23 05:53:55 s 1 +151731.62 7 +272198.65 1460.0 C57
2021-11-23 06:03:55 S 06 36 16.570 +12 50 45.60 V C57
2021-11-23 06:03:55 s 1 +151507.27 3 +272689.86 4910.0 C57
2021-11-23 06:13:55 S 06 36 16.109 +12 50 44.38 V C57
2021-11-23 06:13:55 s 1 +151282.22 5 +273179.82 5940.0 C57
2021-11-23 07:33:55 S 06 36 12.924 +12 50 45.92 V C57
2021-11-23 07:33:55 s 1 +149457.26 8 +277055.11 7930.0 C57
2021-11-23 07:43:55 S 06 36 12.612 +12 50 45.35 V C57
2021-11-23 07:43:55 s 1 +149226.11 9 +277533.98 7570.0 C57
2021-11-23 07:53:55 S 06 36 12.120 +12 50 45.49 V C57
2021-11-23 07:53:55 s 1 +148994.30 7 +278011.63 4880.0 C57
2021-11-23 08:03:55 S 06 36 11.686 +12 50 45.96 V C57
2021-11-23 08:03:55 s 1 +148761.83 5 +278488.06 9870.0 C57
2021-11-23 08:13:55 S 06 36 11.306 +12 50 45.38 V C57
2021-11-23 08:13:55 s 1 +148528.70 5 +278963.25 2570.0 C57
2021-11-23 08:23:55 S 06 36 10.913 +12 50 45.46 V C57
2021-11-23 08:23:55 s 1 +148294.92 0 +279437.23 2970.0 C57
2021-11-23 08:33:55 S 06 36 10.457 +12 50 46.61 V C57
2021-11-23 08:33:55 s 1 +148060.48 2 +279909.99 1090.0 C57
2021-11-23 08:43:55 S 06 36 10.090 +12 50 45.64 V C57
2021-11-23 08:43:55 s 1 +147825.39 6 +280381.53 6930.0 C57
2021-11-23 08:53:55 S 06 36 09.763 +12 50 47.29 V C57
2021-11-23 08:53:55 s 1 +147589.66 2 +280851.84 520.0 C57
2021-11-23 09:03:55 S 06 36 09.238 +12 50 45.35 V C57
2021-11-23 09:03:55 s 1 +147353.28 5 +281320.94 1850.0 C57
2021-11-23 09:13:55 S 06 36 08.911 +12 50 45.67 V C57
2021-11-23 09:13:55 s 1 +147116.26 7 +281788.83 940.0 C57
2021-11-23 09:23:55 S 06 36 08.599 +12 50 45.96 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)