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
2021-11-25 08:33:55 s 1 +61863.158 0 +369066.66 2440.0 C57
2021-11-25 08:53:55 S 06 34 08.076 +12 50 52.48 V C57
2021-11-25 08:53:55 s 1 +61180.031 0 +369378.25 140.0 C57
2021-11-25 09:03:55 S 06 34 07.618 +12 50 52.37 V C57
2021-11-25 09:03:55 s 1 +60838.218 0 +369532.53 8270.0 C57
2021-11-25 09:13:55 S 06 34 07.236 +12 50 53.66 V C57
2021-11-25 09:13:55 s 1 +60496.241 0 +369685.79 5920.0 C57
2021-11-25 09:23:55 S 06 34 06.859 +12 50 53.16 V C57
2021-11-25 09:23:55 s 1 +60154.100 0 +369838.05 3110.0 C57
2021-11-25 09:33:55 S 06 34 06.403 +12 50 52.91 V C57
2021-11-25 09:33:55 s 1 +59811.797 0 +369989.29 9830.0 C57
2021-11-25 09:43:55 S 06 34 05.887 +12 50 52.40 V C57
2021-11-25 09:43:55 s 1 +59469.332 0 +370139.52 6090.0 C57
2021-11-25 09:53:55 S 06 34 05.350 +12 50 53.56 V C57
2021-11-25 09:53:55 s 1 +59126.708 0 +370288.74 1900.0 C57
2021-11-25 10:03:55 S 06 34 05.011 +12 50 52.94 V C57
2021-11-25 10:03:55 s 1 +58783.924 0 +370436.95 7250.0 C57
2021-11-25 10:13:54 S 06 34 04.582 +12 50 52.87 V C57
2021-11-25 10:13:54 s 1 +58440.982 0 +370584.15 2150.0 C57
2021-11-25 10:23:55 S 06 34 04.121 +12 50 53.81 V C57
2021-11-25 10:23:55 s 1 +58097.883 0 +370730.34 6610.0 C57
2021-11-25 10:33:55 S 06 34 03.722 +12 50 53.95 V C57
2021-11-25 10:33:55 s 1 +57754.628 0 +370875.52 620.0 C57
2021-11-25 10:43:55 S 06 34 03.286 +12 50 53.88 V C57
2021-11-25 10:43:55 s 1 +57411.218 0 +371019.69 4200.0 C57
2021-11-25 10:53:55 S 06 34 02.748 +12 50 52.69 V C57
2021-11-25 10:53:55 s 1 +57067.654 0 +371162.86 7340.0 C57
2021-11-25 11:03:55 S 06 34 02.395 +12 50 52.04 V C57
2021-11-25 11:03:55 s 1 +56723.937 0 +371305.01 60.0 C57
2021-11-25 11:13:55 S 06 34 02.014 +12 50 53.81 V C57
2021-11-25 11:13:55 s 1 +56380.069 0 +371446.15 2350.0 C57
2021-11-25 11:23:55 S 06 34 01.402 +12 50 53.66 V C57
2021-11-25 11:23:55 s 1 +56036.050 0 +371586.29 4220.0 C57
2021-11-25 11:33:55 S 06 34 01.044 +12 50 54.24 V C57
2021-11-25 11:33:55 s 1 +55691.881 0 +371725.42 5670.0 C57
2021-11-25 11:43:54 S 06 34 00.631 +12 50 53.77 V C57
2021-11-25 11:43:54 s 1 +55347.564 0 +371863.54 6710.0 C57
2021-11-25 11:53:55 S 06 34 00.084 +12 50 53.92 V C57
2021-11-25 11:53:55 s 1 +55003.099 0 +372000.65 7340.0 C57
2021-11-25 12:03:55 S 06 33 59.657 +12 50 54.02 V C57
2021-11-25 12:03:55 s 1 +54658.488 0 +372136.76 7560.0 C57
2021-11-25 12:13:55 S 06 33 59.256 +12 50 52.94 V C57
2021-11-25 12:13:55 s 1 +54313.731 0 +372271.86 7390.0 C57
2021-11-25 12:23:55 S 06 33 58.752 +12 50 54.35 V C57
2021-11-25 12:23:55 s 1 +53968.830 0 +372405.95 6820.0 C57
2021-11-25 12:33:55 S 06 33 58.320 +12 50 53.41 V C57
2021-11-25 12:33:55 s 1 +53623.785 0 +372539.04 5850.0 C57
2021-11-25 12:38:04 C 06 33 51.03 +12 49 23.4 V T05
2021-11-25 12:43:08 C 06 33 50.80 +12 49 23.5 V T05
2021-11-25 12:43:55 S 06 33 57.946 +12 50 53.56 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)