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
2021-11-24 11:23:55 s 1 +103473.46 1 +340850.26 1940.0 C57
2021-11-24 11:33:55 S 06 35 03.425 +12 50 50.28 V C57
2021-11-24 11:33:55 s 1 +103162.75 5 +341138.53 8400.0 C57
2021-11-24 11:43:55 S 06 35 03.010 +12 50 50.14 V C57
2021-11-24 11:43:55 s 1 +102851.72 4 +341425.73 3780.0 C57
2021-11-24 11:53:55 S 06 35 02.666 +12 50 50.46 V C57
2021-11-24 11:53:55 s 1 +102540.37 0 +341711.86 8090.0 C57
2021-11-24 12:03:55 S 06 35 02.218 +12 50 49.45 V C57
2021-11-24 12:03:55 s 1 +102228.69 4 +341996.92 1340.0 C57
2021-11-24 12:13:55 S 06 35 01.764 +12 50 50.46 V C57
2021-11-24 12:13:55 s 1 +101916.69 8 +342280.91 3520.0 C57
2021-11-24 12:23:55 S 06 35 01.349 +12 50 49.88 V C57
2021-11-24 12:23:55 s 1 +101604.38 2 +342563.83 4660.0 C57
2021-11-24 12:33:55 S 06 35 00.907 +12 50 50.68 V C57
2021-11-24 12:33:55 s 1 +101291.75 0 +342845.68 4740.0 C57
2021-11-24 12:43:55 S 06 35 00.446 +12 50 50.06 V C57
2021-11-24 12:43:55 s 1 +100978.80 0 +343126.46 3780.0 C57
2021-11-24 12:53:55 S 06 35 00.101 +12 50 49.42 V C57
2021-11-24 12:53:55 s 1 +100665.53 7 +343406.17 1790.0 C57
2021-11-24 13:03:55 S 06 34 59.657 +12 50 49.96 V C57
2021-11-24 13:03:55 s 1 +100351.96 0 +343684.82 8760.0 C57
2021-11-24 13:13:55 S 06 34 59.136 +12 50 50.53 V C57
2021-11-24 13:13:55 s 1 +100038.07 1 +343962.39 4700.0 C57
2021-11-24 13:23:55 S 06 34 58.762 +12 50 50.28 V C57
2021-11-24 13:23:55 s 1 +99723.872 0 +344238.91 9630.0 C57
2021-11-24 13:33:55 S 06 34 58.354 +12 50 50.64 V C57
2021-11-24 13:33:55 s 1 +99409.364 0 +344514.36 3530.0 C57
2021-11-24 13:43:55 S 06 34 57.910 +12 50 49.74 V C57
2021-11-24 13:43:55 s 1 +99094.549 0 +344788.74 6430.0 C57
2021-11-24 13:53:55 S 06 34 57.430 +12 50 50.64 V C57
2021-11-24 13:53:55 s 1 +98779.427 0 +345062.06 8320.0 C57
2021-11-24 14:03:55 S 06 34 57.096 +12 50 49.60 V C57
2021-11-24 14:03:55 s 1 +98464.000 0 +345334.31 9210.0 C57
2021-11-24 14:13:55 S 06 34 56.674 +12 50 50.57 V C57
2021-11-24 14:13:55 s 1 +98148.271 0 +345605.51 9100.0 C57
2021-11-24 14:23:55 S 06 34 56.189 +12 50 50.78 V C57
2021-11-24 14:23:55 s 1 +97832.239 0 +345875.64 8010.0 C57
2021-11-24 14:33:55 S 06 34 55.819 +12 50 50.96 V C57
2021-11-24 14:33:55 s 1 +97515.907 0 +346144.71 5930.0 C57
2021-11-24 14:43:55 S 06 34 55.373 +12 50 49.81 V C57
2021-11-24 14:43:55 s 1 +97199.276 0 +346412.71 2870.0 C57
2021-11-24 14:53:55 S 06 34 54.931 +12 50 51.11 V C57
2021-11-24 14:53:55 s 1 +96882.346 0 +346679.66 8830.0 C57
2021-11-24 15:03:55 S 06 34 54.516 +12 50 50.17 V C57
2021-11-24 15:03:55 s 1 +96565.121 0 +346945.55 3830.0 C57
2021-11-24 15:13:55 S 06 34 54.089 +12 50 50.06 V C57
2021-11-24 15:13:55 s 1 +96247.601 0 +347210.38 7860.0 C57
2021-11-24 15:23:55 S 06 34 53.635 +12 50 51.50 V C57
2021-11-24 15:23:55 s 1 +95929.787 0 +347474.15 930.0 C57
2021-11-24 15:33:55 S 06 34 53.201 +12 50 50.35 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)