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 03:13:54 s 1 -121667.01 7 +304710.26 4910.0 C57
2021-11-29 03:23:54 S 06 29 53.861 +12 51 22.57 V C57
2021-11-29 03:23:54 s 1 -121944.88 8 +304300.73 3060.0 C57
2021-11-29 03:33:54 S 06 29 53.374 +12 51 22.61 V C57
2021-11-29 03:33:54 s 1 -122222.27 3 +303890.01 9080.0 C57
2021-11-29 03:43:54 S 06 29 52.903 +12 51 22.57 V C57
2021-11-29 03:43:54 s 1 -122499.16 8 +303478.09 2970.0 C57
2021-11-29 03:53:54 S 06 29 52.387 +12 51 23.36 V C57
2021-11-29 03:53:54 s 1 -122775.57 1 +303064.98 4720.0 C57
2021-11-29 04:03:54 S 06 29 51.972 +12 51 23.40 V C57
2021-11-29 04:03:54 s 1 -123051.48 1 +302650.66 4320.0 C57
2021-11-29 04:13:54 S 06 29 51.341 +12 51 22.75 V C57
2021-11-29 04:13:54 s 1 -123326.89 4 +302235.15 1770.0 C57
2021-11-29 04:23:54 S 06 29 50.959 +12 51 23.44 V C57
2021-11-29 04:23:54 s 1 -123601.80 9 +301818.43 7040.0 C57
2021-11-29 04:33:54 S 06 29 50.455 +12 51 23.29 V C57
2021-11-29 04:33:54 s 1 -123876.22 4 +301400.52 140.0 C57
2021-11-29 04:43:54 S 06 29 49.918 +12 51 23.58 V C57
2021-11-29 04:43:54 s 1 -124150.13 5 +300981.40 1060.0 C57
2021-11-29 04:53:54 S 06 29 49.502 +12 51 23.62 V C57
2021-11-29 04:53:54 s 1 -124423.54 1 +300561.08 9770.0 C57
2021-11-29 05:03:54 S 06 29 48.938 +12 51 23.58 V C57
2021-11-29 05:03:54 s 1 -124696.44 0 +300139.55 6290.0 C57
2021-11-29 05:13:54 S 06 29 48.478 +12 51 23.83 V C57
2021-11-29 05:13:54 s 1 -124968.82 9 +299716.82 590.0 C57
2021-11-29 05:23:54 S 06 29 48.036 +12 51 23.58 V C57
2021-11-29 05:23:54 s 1 -125240.70 6 +299292.88 2670.0 C57
2021-11-29 05:33:54 S 06 29 47.510 +12 51 24.41 V C57
2021-11-29 05:33:54 s 1 -125512.06 9 +298867.73 2510.0 C57
2021-11-29 05:43:54 S 06 29 47.021 +12 51 24.08 V C57
2021-11-29 05:43:54 s 1 -125782.91 5 +298441.37 120.0 C57
2021-11-29 05:53:54 S 06 29 46.546 +12 51 23.83 V C57
2021-11-29 05:53:54 s 1 -126053.24 2 +298013.80 5470.0 C57
2021-11-29 06:03:54 S 06 29 46.039 +12 51 23.33 V C57
2021-11-29 06:03:54 s 1 -126323.04 8 +297585.02 8560.0 C57
2021-11-29 06:13:54 S 06 29 45.554 +12 51 23.76 V C57
2021-11-29 06:13:54 s 1 -126592.33 0 +297155.02 9380.0 C57
2021-11-29 06:23:54 S 06 29 45.022 +12 51 23.47 V C57
2021-11-29 06:23:54 s 1 -126861.08 6 +296723.81 7920.0 C57
2021-11-29 06:33:54 S 06 29 44.518 +12 51 24.37 V C57
2021-11-29 06:33:54 s 1 -127129.31 3 +296291.38 4170.0 C57
2021-11-29 06:43:54 S 06 29 44.026 +12 51 24.77 V C57
2021-11-29 06:43:54 s 1 -127397.01 0 +295857.74 8120.0 C57
2021-11-29 06:53:54 S 06 29 43.644 +12 51 24.48 V C57
2021-11-29 06:53:54 s 1 -127664.17 3 +295422.88 9760.0 C57
2021-11-29 07:03:54 S 06 29 43.039 +12 51 24.91 V C57
2021-11-29 07:03:54 s 1 -127930.80 1 +294986.79 9080.0 C57
2021-11-29 07:13:54 S 06 29 42.595 +12 51 24.19 V C57
2021-11-29 07:13:54 s 1 -128196.89 0 +294549.49 6070.0 C57
2021-11-29 07:23:54 S 06 29 42.101 +12 51 24.66 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)