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
2021-11-29 20:53:54 s 1 -147928.37 6 +254409.12 4110.0 C57
2021-11-29 21:03:54 S 06 29 01.550 +12 51 34.67 V C57
2021-11-29 21:03:54 s 1 -148140.04 5 +253865.63 8030.0 C57
2021-11-29 21:13:54 S 06 29 01.056 +12 51 34.56 V C57
2021-11-29 21:13:54 s 1 -148350.92 1 +253320.80 8580.0 C57
2021-11-29 21:23:54 S 06 29 00.576 +12 51 34.85 V C57
2021-11-29 21:23:54 s 1 -148561.00 1 +252774.62 5760.0 C57
2021-11-29 21:33:54 S 06 29 00.134 +12 51 35.39 V C57
2021-11-29 21:33:54 s 1 -148770.28 2 +252227.09 9550.0 C57
2021-11-29 21:43:54 S 06 28 59.573 +12 51 35.35 V C57
2021-11-29 21:43:54 s 1 -148978.76 0 +251678.22 9920.0 C57
2021-11-29 21:53:54 S 06 28 59.074 +12 51 35.68 V C57
2021-11-29 21:53:54 s 1 -149186.43 0 +251127.99 6880.0 C57
2021-11-29 22:03:54 S 06 28 58.572 +12 51 35.35 V C57
2021-11-29 22:03:54 s 1 -149393.28 9 +250576.41 390.0 C57
2021-11-29 22:13:54 S 06 28 58.061 +12 51 35.96 V C57
2021-11-29 22:13:54 s 1 -149599.33 3 +250023.48 440.0 C57
2021-11-29 22:23:54 S 06 28 57.607 +12 51 36.25 V C57
2021-11-29 22:23:54 s 1 -149804.55 8 +249469.19 7020.0 C57
2021-11-29 22:33:54 S 06 28 57.055 +12 51 35.57 V C57
2021-11-29 22:33:54 s 1 -150008.96 0 +248913.54 110.0 C57
2021-11-29 22:43:54 S 06 28 56.537 +12 51 36.43 V C57
2021-11-29 22:43:54 s 1 -150212.53 5 +248356.54 9700.0 C57
2021-11-29 22:53:54 S 06 28 56.021 +12 51 36.43 V C57
2021-11-29 22:53:54 s 1 -150415.28 0 +247798.17 5770.0 C57
2021-11-29 23:03:54 S 06 28 55.598 +12 51 36.90 V C57
2021-11-29 23:03:54 s 1 -150617.19 0 +247238.44 8300.0 C57
2021-11-29 23:13:54 S 06 28 55.188 +12 51 37.51 V C57
2021-11-29 23:13:54 s 1 -150818.26 1 +246677.35 7280.0 C57
2021-11-29 23:23:54 S 06 28 54.564 +12 51 36.14 V C57
2021-11-29 23:23:54 s 1 -151018.48 9 +246114.89 2690.0 C57
2021-11-29 23:33:54 S 06 28 54.065 +12 51 35.42 V C57
2021-11-29 23:33:54 s 1 -151217.87 0 +245551.07 4510.0 C57
2021-11-29 23:43:54 S 06 28 53.686 +12 51 36.36 V C57
2021-11-29 23:43:54 s 1 -151416.40 0 +244985.87 2730.0 C57
2021-11-29 23:53:54 S 06 28 53.083 +12 51 37.19 V C57
2021-11-29 23:53:54 s 1 -151614.07 5 +244419.30 7330.0 C57
2021-11-30 00:03:54 S 06 28 52.632 +12 51 37.66 V C57
2021-11-30 00:03:54 s 1 -151810.89 1 +243851.36 8300.0 C57
2021-11-30 00:13:54 S 06 28 52.123 +12 51 37.08 V C57
2021-11-30 00:13:54 s 1 -152006.84 3 +243282.05 5610.0 C57
2021-11-30 00:23:54 S 06 28 51.590 +12 51 38.12 V C57
2021-11-30 00:23:54 s 1 -152201.92 7 +242711.36 9250.0 C57
2021-11-30 00:33:54 S 06 28 51.118 +12 51 37.98 V C57
2021-11-30 00:33:54 s 1 -152396.14 0 +242139.29 9200.0 C57
2021-11-30 00:43:54 S 06 28 50.645 +12 51 37.37 V C57
2021-11-30 00:43:54 s 1 -152589.47 6 +241565.84 5450.0 C57
2021-11-30 00:53:54 S 06 28 50.093 +12 51 38.77 V C57
2021-11-30 00:53:54 s 1 -152781.93 2 +240991.01 7970.0 C57
2021-11-30 01:03:54 S 06 28 49.690 +12 51 36.58 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)