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 21:53:55 s 1 +127417.79 3 +313874.66 2390.0 C57
2021-11-23 22:03:55 S 06 35 37.416 +12 50 48.26 V C57
2021-11-23 22:03:55 s 1 +127138.73 1 +314252.19 5740.0 C57
2021-11-23 22:13:55 S 06 35 37.025 +12 50 47.87 V C57
2021-11-23 22:13:55 s 1 +126859.20 8 +314628.58 7510.0 C57
2021-11-23 22:23:55 S 06 35 36.586 +12 50 48.05 V C57
2021-11-23 22:23:55 s 1 +126579.22 5 +315003.85 7710.0 C57
2021-11-23 22:33:55 S 06 35 36.182 +12 50 48.16 V C57
2021-11-23 22:33:55 s 1 +126298.78 5 +315377.98 6340.0 C57
2021-11-23 22:43:55 S 06 35 35.842 +12 50 48.73 V C57
2021-11-23 22:43:55 s 1 +126017.88 9 +315750.97 3410.0 C57
2021-11-23 22:53:55 S 06 35 35.323 +12 50 46.68 V C57
2021-11-23 22:53:55 s 1 +125736.54 0 +316122.84 8930.0 C57
2021-11-23 23:03:55 S 06 35 34.987 +12 50 48.55 V C57
2021-11-23 23:03:55 s 1 +125454.73 9 +316493.58 2900.0 C57
2021-11-23 23:13:55 S 06 35 34.591 +12 50 48.48 V C57
2021-11-23 23:13:55 s 1 +125172.48 8 +316863.19 5340.0 C57
2021-11-23 23:23:55 S 06 35 34.154 +12 50 47.33 V C57
2021-11-23 23:23:55 s 1 +124889.79 0 +317231.67 6240.0 C57
2021-11-23 23:33:55 S 06 35 33.799 +12 50 47.98 V C57
2021-11-23 23:33:55 s 1 +124606.64 6 +317599.02 5620.0 C57
2021-11-23 23:43:55 S 06 35 33.310 +12 50 48.73 V C57
2021-11-23 23:43:55 s 1 +124323.05 7 +317965.24 3480.0 C57
2021-11-23 23:53:55 S 06 35 33.007 +12 50 49.16 V C57
2021-11-23 23:53:55 s 1 +124039.02 6 +318330.35 9830.0 C57
2021-11-24 00:03:55 S 06 35 32.515 +12 50 48.16 V C57
2021-11-24 00:03:55 s 1 +123754.55 6 +318694.32 4680.0 C57
2021-11-24 00:13:55 S 06 35 31.990 +12 50 48.12 V C57
2021-11-24 00:13:55 s 1 +123469.64 6 +319057.17 8030.0 C57
2021-11-24 00:23:55 S 06 35 31.656 +12 50 48.70 V C57
2021-11-24 00:23:55 s 1 +123184.30 0 +319418.90 9890.0 C57
2021-11-24 00:33:55 S 06 35 31.272 +12 50 48.98 V C57
2021-11-24 00:33:55 s 1 +122898.51 9 +319779.51 270.0 C57
2021-11-24 00:43:55 S 06 35 30.778 +12 50 48.44 V C57
2021-11-24 00:43:55 s 1 +122612.30 5 +320138.99 9180.0 C57
2021-11-24 00:53:55 S 06 35 30.384 +12 50 47.62 V C57
2021-11-24 00:53:55 s 1 +122325.66 1 +320497.36 6610.0 C57
2021-11-24 01:03:55 S 06 35 30.034 +12 50 49.09 V C57
2021-11-24 01:03:55 s 1 +122038.58 6 +320854.60 2580.0 C57
2021-11-24 01:13:55 S 06 35 29.558 +12 50 49.96 V C57
2021-11-24 01:13:55 s 1 +121751.08 5 +321210.73 7090.0 C57
2021-11-24 01:23:55 S 06 35 29.150 +12 50 48.66 V C57
2021-11-24 01:23:55 s 1 +121463.15 8 +321565.74 160.0 C57
2021-11-24 01:33:55 S 06 35 28.745 +12 50 48.88 V C57
2021-11-24 01:33:55 s 1 +121174.80 7 +321919.63 1780.0 C57
2021-11-24 01:43:55 S 06 35 28.337 +12 50 49.20 V C57
2021-11-24 01:43:55 s 1 +120886.03 4 +322272.41 1970.0 C57
2021-11-24 01:53:55 S 06 35 27.934 +12 50 49.20 V C57
2021-11-24 01:53:55 s 1 +120596.84 0 +322624.07 730.0 C57
2021-11-24 02:03:55 S 06 35 27.490 +12 50 47.72 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)