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
2021-10-03 20:33:58 S 06 37 33.850 +14 28 55.88 V C57
2021-10-03 20:33:58 s 1 +98632.904 0 +332846.96 840.0 C57
2021-10-03 20:43:58 S 06 37 34.250 +14 28 52.61 V C57
2021-10-03 20:43:58 s 1 +98297.994 0 +333138.69 9740.0 C57
2021-10-03 20:53:58 S 06 37 34.414 +14 28 48.61 V C57
2021-10-03 20:53:58 s 1 +97962.762 0 +333429.27 7630.0 C57
2021-10-03 21:03:58 S 06 37 34.759 +14 28 46.81 V C57
2021-10-03 21:03:58 s 1 +97627.209 0 +333718.72 4510.0 C57
2021-10-03 21:13:58 S 06 37 35.148 +14 28 48.18 V C57
2021-10-03 21:13:58 s 1 +97291.336 0 +334007.03 390.0 C57
2021-10-03 21:23:58 S 06 37 35.479 +14 28 46.20 V C57
2021-10-03 21:23:58 s 1 +96955.145 0 +334294.20 5270.0 C57
2021-10-03 22:43:58 S 06 37 37.927 +14 28 35.83 V C57
2021-10-03 22:43:58 s 1 +94254.372 0 +336550.75 9050.0 C57
2021-10-03 22:53:58 S 06 37 38.186 +14 28 35.98 V C57
2021-10-03 22:53:58 s 1 +93915.393 0 +336827.72 5190.0 C57
2021-10-03 22:54:11 S 06 37 30.45 +14 27 15.3 L C51
2021-10-03 23:03:58 S 06 37 38.702 +14 28 35.36 V C57
2021-10-03 23:03:58 s 1 +93576.112 0 +337103.57 390.0 C57
2021-10-03 23:13:58 S 06 37 38.995 +14 28 32.48 V C57
2021-10-03 23:13:58 s 1 +93236.532 0 +337378.28 4650.0 C57
2021-10-03 23:23:58 S 06 37 39.341 +14 28 32.16 V C57
2021-10-03 23:23:58 s 1 +92896.652 0 +337651.87 7970.0 C57
2021-10-03 23:33:58 S 06 37 39.562 +14 28 30.79 V C57
2021-10-03 23:33:58 s 1 +92556.476 0 +337924.33 370.0 C57
2021-10-03 23:43:58 S 06 37 39.845 +14 28 28.31 V C57
2021-10-03 23:43:58 s 1 +92216.004 0 +338195.66 1840.0 C57
2021-10-03 23:53:58 S 06 37 40.193 +14 28 27.59 V C57
2021-10-03 23:53:58 s 1 +91875.238 0 +338465.87 2390.0 C57
2021-10-04 00:03:58 S 06 37 40.644 +14 28 26.98 V C57
2021-10-04 00:03:58 s 1 +91534.179 0 +338734.95 2030.0 C57
2021-10-04 01:03:58 S 06 37 42.461 +14 28 16.50 V C57
2021-10-04 01:03:58 s 1 +89481.775 0 +340325.83 930.0 C57
2021-10-04 01:13:58 S 06 37 42.722 +14 28 19.24 V C57
2021-10-04 01:13:58 s 1 +89138.713 0 +340587.05 4310.0 C57
2021-10-04 01:23:58 S 06 37 43.162 +14 28 16.61 V C57
2021-10-04 01:23:58 s 1 +88795.370 0 +340847.14 6820.0 C57
2021-10-04 01:33:58 S 06 37 43.428 +14 28 14.92 V C57
2021-10-04 01:33:58 s 1 +88451.749 0 +341106.12 8460.0 C57
2021-10-04 01:43:58 S 06 37 43.615 +14 28 15.64 V C57
2021-10-04 01:43:58 s 1 +88107.851 0 +341363.98 9230.0 C57
2021-10-04 01:53:58 S 06 37 44.064 +14 28 14.41 V C57
2021-10-04 01:53:58 s 1 +87763.678 0 +341620.72 9140.0 C57
2021-10-04 02:02:30 S 06 37 36.71 +14 26 52.0 L C51
2021-10-04 02:03:58 S 06 37 44.218 +14 28 12.50 V C57
2021-10-04 02:03:58 s 1 +87419.230 0 +341876.34 8200.0 C57
2021-10-04 03:23:58 S 06 37 46.654 +14 28 01.81 V C57
2021-10-04 03:23:58 s 1 +84653.957 0 +343881.12 490.0 C57
2021-10-04 03:33:58 S 06 37 47.150 +14 28 01.20 V C57
2021-10-04 03:33:58 s 1 +84307.109 0 +344126.70 2070.0 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)