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 15:33:55 s 1 +95611.680 0 +347736.86 3050.0 C57
2021-11-24 15:43:55 S 06 34 52.776 +12 50 50.71 V C57
2021-11-24 15:43:55 s 1 +95293.283 0 +347998.51 4220.0 C57
2021-11-24 15:53:55 S 06 34 52.296 +12 50 50.35 V C57
2021-11-24 15:53:55 s 1 +94974.597 0 +348259.10 4440.0 C57
2021-11-24 16:03:55 S 06 34 51.994 +12 50 51.11 V C57
2021-11-24 16:03:55 s 1 +94655.622 0 +348518.64 3730.0 C57
2021-11-24 16:13:55 S 06 34 51.569 +12 50 50.93 V C57
2021-11-24 16:13:55 s 1 +94336.361 0 +348777.13 2080.0 C57
2021-11-24 16:23:55 S 06 34 51.091 +12 50 50.93 V C57
2021-11-24 16:23:55 s 1 +94016.814 0 +349034.56 9510.0 C57
2021-11-24 16:33:55 S 06 34 50.654 +12 50 50.46 V C57
2021-11-24 16:33:55 s 1 +93696.983 0 +349290.93 6010.0 C57
2021-11-24 16:43:55 S 06 34 50.294 +12 50 51.00 V C57
2021-11-24 16:43:55 s 1 +93376.869 0 +349546.25 1590.0 C57
2021-11-24 16:53:55 S 06 34 49.826 +12 50 50.96 V C57
2021-11-24 16:53:55 s 1 +93056.474 0 +349800.51 6260.0 C57
2021-11-24 17:03:55 S 06 34 49.375 +12 50 50.71 V C57
2021-11-24 17:03:55 s 1 +92735.798 0 +350053.73 20.0 C57
2021-11-24 17:13:55 S 06 34 48.977 +12 50 50.21 V C57
2021-11-24 17:13:55 s 1 +92414.844 0 +350305.89 2880.0 C57
2021-11-24 17:23:55 S 06 34 48.497 +12 50 50.21 V C57
2021-11-24 17:23:55 s 1 +92093.613 0 +350556.99 4840.0 C57
2021-11-24 17:33:55 S 06 34 48.082 +12 50 51.25 V C57
2021-11-24 17:33:55 s 1 +91772.106 0 +350807.05 5900.0 C57
2021-11-24 17:43:55 S 06 34 47.731 +12 50 50.68 V C57
2021-11-24 17:43:55 s 1 +91450.323 0 +351056.06 6080.0 C57
2021-11-24 17:53:55 S 06 34 47.268 +12 50 50.86 V C57
2021-11-24 17:53:55 s 1 +91128.268 0 +351304.01 5370.0 C57
2021-11-24 18:03:55 S 06 34 46.793 +12 50 50.35 V C57
2021-11-24 18:03:55 s 1 +90805.940 0 +351550.91 3780.0 C57
2021-11-24 18:13:55 S 06 34 46.351 +12 50 51.14 V C57
2021-11-24 18:13:55 s 1 +90483.342 0 +351796.77 1320.0 C57
2021-11-24 18:23:55 S 06 34 45.967 +12 50 50.86 V C57
2021-11-24 18:23:55 s 1 +90160.473 0 +352041.58 7990.0 C57
2021-11-24 18:33:55 S 06 34 45.514 +12 50 51.58 V C57
2021-11-24 18:33:55 s 1 +89837.337 0 +352285.33 3800.0 C57
2021-11-24 18:43:55 S 06 34 45.072 +12 50 50.82 V C57
2021-11-24 18:43:55 s 1 +89513.934 0 +352528.05 8750.0 C57
2021-11-24 18:53:55 S 06 34 44.777 +12 50 51.86 V C57
2021-11-24 18:53:55 s 1 +89190.266 0 +352769.71 2840.0 C57
2021-11-24 19:03:55 S 06 34 44.242 +12 50 49.88 V C57
2021-11-24 19:03:55 s 1 +88866.333 0 +353010.32 6090.0 C57
2021-11-24 19:13:55 S 06 34 43.747 +12 50 50.53 V C57
2021-11-24 19:13:55 s 1 +88542.137 0 +353249.90 8490.0 C57
2021-11-24 19:23:55 S 06 34 43.435 +12 50 51.29 V C57
2021-11-24 19:23:55 s 1 +88217.679 0 +353488.42 40.0 C57
2021-11-24 19:33:55 S 06 34 42.900 +12 50 50.39 V C57
2021-11-24 19:33:55 s 1 +87892.961 0 +353725.90 770.0 C57
2021-11-24 19:43:55 S 06 34 42.492 +12 50 51.94 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)