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 06:13:55 s 1 +112936.03 5 +331378.35 7900.0 C57
2021-11-24 06:53:55 S 06 35 15.106 +12 50 47.83 V C57
2021-11-24 06:53:55 s 1 +111734.26 6 +332659.18 760.0 C57
2021-11-24 07:03:55 S 06 35 14.760 +12 50 50.06 V C57
2021-11-24 07:03:55 s 1 +111432.90 1 +332976.65 8370.0 C57
2021-11-24 07:23:55 S 06 35 13.973 +12 50 50.75 V C57
2021-11-24 07:23:55 s 1 +110829.07 3 +333608.33 9920.0 C57
2021-11-24 07:33:55 S 06 35 13.579 +12 50 48.80 V C57
2021-11-24 07:33:55 s 1 +110526.61 3 +333922.54 3860.0 C57
2021-11-24 07:43:55 S 06 35 13.308 +12 50 49.34 V C57
2021-11-24 07:43:55 s 1 +110223.79 3 +334235.65 6600.0 C57
2021-11-24 07:53:55 S 06 35 12.845 +12 50 48.73 V C57
2021-11-24 07:53:55 s 1 +109920.61 3 +334547.68 8120.0 C57
2021-11-24 08:13:55 S 06 35 12.110 +12 50 49.16 V C57
2021-11-24 08:13:55 s 1 +109313.17 9 +335168.48 7590.0 C57
2021-11-24 08:23:55 S 06 35 11.491 +12 50 48.52 V C57
2021-11-24 08:23:55 s 1 +109008.92 9 +335477.25 5530.0 C57
2021-11-24 08:33:55 S 06 35 11.126 +12 50 47.15 V C57
2021-11-24 08:33:55 s 1 +108704.32 5 +335784.94 2290.0 C57
2021-11-24 08:53:55 S 06 35 10.207 +12 50 48.88 V C57
2021-11-24 08:53:55 s 1 +108094.06 3 +336397.06 2300.0 C57
2021-11-24 09:03:55 S 06 35 09.816 +12 50 50.89 V C57
2021-11-24 09:03:55 s 1 +107788.40 8 +336701.49 5550.0 C57
2021-11-24 09:13:55 S 06 35 09.401 +12 50 47.87 V C57
2021-11-24 09:13:55 s 1 +107482.40 6 +337004.84 7640.0 C57
2021-11-24 09:23:55 S 06 35 08.894 +12 50 48.23 V C57
2021-11-24 09:23:55 s 1 +107176.05 8 +337307.11 8580.0 C57
2021-11-24 09:33:55 S 06 35 08.544 +12 50 49.38 V C57
2021-11-24 09:33:55 s 1 +106869.36 5 +337608.30 8380.0 C57
2021-11-24 09:43:55 S 06 35 08.141 +12 50 49.56 V C57
2021-11-24 09:43:55 s 1 +106562.33 0 +337908.42 7030.0 C57
2021-11-24 09:53:55 S 06 35 07.721 +12 50 49.09 V C57
2021-11-24 09:53:55 s 1 +106254.95 4 +338207.45 4540.0 C57
2021-11-24 10:03:55 S 06 35 07.224 +12 50 50.06 V C57
2021-11-24 10:03:55 s 1 +105947.23 8 +338505.40 920.0 C57
2021-11-24 10:13:55 S 06 35 06.898 +12 50 49.27 V C57
2021-11-24 10:13:55 s 1 +105639.18 4 +338802.27 6180.0 C57
2021-11-24 10:23:55 S 06 35 06.413 +12 50 49.74 V C57
2021-11-24 10:23:55 s 1 +105330.79 3 +339098.07 320.0 C57
2021-11-24 10:33:55 S 06 35 06.019 +12 50 49.96 V C57
2021-11-24 10:33:55 s 1 +105022.06 7 +339392.79 3340.0 C57
2021-11-24 10:43:55 S 06 35 05.558 +12 50 49.45 V C57
2021-11-24 10:43:55 s 1 +104713.00 7 +339686.43 5260.0 C57
2021-11-24 10:53:55 S 06 35 05.206 +12 50 49.34 V C57
2021-11-24 10:53:55 s 1 +104403.61 5 +339979.00 6070.0 C57
2021-11-24 11:03:55 S 06 35 04.692 +12 50 49.56 V C57
2021-11-24 11:03:55 s 1 +104093.89 2 +340270.49 5780.0 C57
2021-11-24 11:13:55 S 06 35 04.337 +12 50 49.99 V C57
2021-11-24 11:13:55 s 1 +103783.84 1 +340560.91 4410.0 C57
2021-11-24 11:23:55 S 06 35 03.974 +12 50 50.75 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)