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
2021-09-20 09:03:58 s 1 +110235.02 8 +312153.02 7580.0 C57
2021-09-20 09:13:58 S 06 24 26.167 +15 07 13.98 V C57
2021-09-20 09:13:58 s 1 +109914.58 6 +312519.01 5850.0 C57
2021-09-20 09:23:58 S 06 24 26.647 +15 07 13.26 V C57
2021-09-20 09:23:58 s 1 +109593.71 4 +312883.77 2740.0 C57
2021-09-20 09:33:58 S 06 24 27.194 +15 07 11.96 V C57
2021-09-20 09:33:58 s 1 +109272.41 3 +313247.32 8270.0 C57
2021-09-20 09:43:58 S 06 24 27.744 +15 07 09.77 V C57
2021-09-20 09:43:58 s 1 +108950.68 7 +313609.64 2420.0 C57
2021-09-20 09:53:58 S 06 24 28.291 +15 07 11.82 V C57
2021-09-20 09:53:58 s 1 +108628.53 6 +313970.74 5230.0 C57
2021-09-20 11:03:58 S 06 24 31.126 +15 07 03.50 V C57
2021-09-20 11:03:58 s 1 +106361.77 9 +316464.39 7450.0 C57
2021-09-20 11:13:58 S 06 24 31.675 +15 07 02.60 V C57
2021-09-20 11:13:58 s 1 +106036.31 0 +316815.77 9650.0 C57
2021-09-20 11:23:58 S 06 24 32.167 +15 06 59.76 V C57
2021-09-20 11:23:58 s 1 +105710.43 4 +317165.94 550.0 C57
2021-09-20 11:33:58 S 06 24 32.652 +15 06 59.87 V C57
2021-09-20 11:33:58 s 1 +105384.15 6 +317514.90 170.0 C57
2021-09-20 11:43:58 S 06 24 33.074 +15 06 57.96 V C57
2021-09-20 11:43:58 s 1 +105057.47 5 +317862.64 8510.0 C57
2021-09-20 11:53:58 S 06 24 33.696 +15 06 58.97 V C57
2021-09-20 11:53:58 s 1 +104730.39 5 +318209.19 5570.0 C57
2021-09-20 12:03:58 S 06 24 34.039 +15 06 50.00 V C57
2021-09-20 12:03:58 s 1 +104402.91 7 +318554.52 1360.0 C57
2021-09-20 12:13:58 S 06 24 34.428 +15 06 56.20 V C57
2021-09-20 12:13:58 s 1 +104075.04 3 +318898.65 5890.0 C57
2021-09-20 13:13:58 S 06 24 37.054 +15 06 46.48 V C57
2021-09-20 13:13:58 s 1 +102106.59 1 +320941.88 1980.0 C57
2021-09-20 13:33:58 S 06 24 38.174 +15 06 46.48 V C57
2021-09-20 13:33:58 s 1 +101445.06 3 +321612.14 2610.0 C57
2021-09-20 13:43:58 S 06 24 38.458 +15 06 42.44 V C57
2021-09-20 13:43:58 s 1 +101113.73 0 +321945.48 6120.0 C57
2021-09-20 13:53:58 S 06 24 39.086 +15 06 42.66 V C57
2021-09-20 13:53:58 s 1 +100782.02 1 +322277.62 8430.0 C57
2021-09-20 14:03:58 S 06 24 39.518 +15 06 43.13 V C57
2021-09-20 14:03:58 s 1 +100449.93 8 +322608.56 9550.0 C57
2021-09-20 14:13:58 S 06 24 39.912 +15 06 42.62 V C57
2021-09-20 14:13:58 s 1 +100117.48 2 +322938.31 9490.0 C57
2021-09-20 14:23:58 S 06 24 40.478 +15 06 42.66 V C57
2021-09-20 14:23:58 s 1 +99784.655 0 +323266.87 8250.0 C57
2021-09-20 14:33:58 S 06 24 40.783 +15 06 39.06 V C57
2021-09-20 14:33:58 s 1 +99451.459 0 +323594.23 5830.0 C57
2021-09-20 14:43:58 S 06 24 41.242 +15 06 37.15 V C57
2021-09-20 14:43:58 s 1 +99117.897 0 +323920.40 2250.0 C57
2021-09-20 14:53:58 S 06 24 41.690 +15 06 35.96 V C57
2021-09-20 14:53:58 s 1 +98783.969 0 +324245.38 7510.0 C57
2021-09-20 15:33:58 S 06 24 43.822 +15 06 32.29 V C57
2021-09-20 15:33:58 s 1 +97444.643 0 +325533.41 7080.0 C57
2021-09-20 15:43:58 S 06 24 43.980 +15 06 29.05 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)