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
2021-09-26 04:23:58 s 1 -170978.02 9 +230934.91 8550.0 C57
2021-09-26 04:33:58 S 06 30 24.022 +14 49 55.85 V C57
2021-09-26 04:33:58 s 1 -171164.14 4 +230358.87 1130.0 C57
2021-09-26 04:43:58 S 06 30 24.494 +14 49 53.76 V C57
2021-09-26 04:43:58 s 1 -171349.27 7 +229781.50 390.0 C57
2021-09-26 04:53:58 S 06 30 24.955 +14 49 51.96 V C57
2021-09-26 04:53:58 s 1 -171533.42 4 +229202.80 6320.0 C57
2021-09-26 05:03:58 S 06 30 25.538 +14 49 50.45 V C57
2021-09-26 05:03:58 s 1 -171716.58 2 +228622.77 8900.0 C57
2021-09-26 06:13:58 S 06 30 28.190 +14 49 43.03 V C57
2021-09-26 06:13:58 s 1 -172970.58 4 +224525.22 1980.0 C57
2021-09-26 06:23:58 S 06 30 28.601 +14 49 41.99 V C57
2021-09-26 06:23:58 s 1 -173145.65 8 +223934.51 7240.0 C57
2021-09-26 06:33:58 S 06 30 29.047 +14 49 39.72 V C57
2021-09-26 06:33:58 s 1 -173319.70 1 +223342.46 9020.0 C57
2021-09-26 06:43:58 S 06 30 29.328 +14 49 37.31 V C57
2021-09-26 06:43:58 s 1 -173492.70 7 +222749.07 7300.0 C57
2021-09-26 06:53:58 S 06 30 29.746 +14 49 36.55 V C57
2021-09-26 06:53:58 s 1 -173664.67 3 +222154.34 2060.0 C57
2021-09-26 07:03:58 S 06 30 30.149 +14 49 35.11 V C57
2021-09-26 07:03:58 s 1 -173835.59 3 +221558.26 3290.0 C57
2021-09-26 07:13:58 S 06 30 30.614 +14 49 31.94 V C57
2021-09-26 07:13:58 s 1 -174005.46 3 +220960.83 970.0 C57
2021-09-26 07:23:58 S 06 30 31.082 +14 49 32.20 V C57
2021-09-26 07:23:58 s 1 -174174.27 8 +220362.06 5090.0 C57
2021-09-26 08:23:58 S 06 30 33.566 +14 49 26.11 V C57
2021-09-26 08:23:58 s 1 -175164.73 4 +216741.10 4080.0 C57
2021-09-26 08:33:58 S 06 30 33.823 +14 49 23.34 V C57
2021-09-26 08:33:58 s 1 -175326.02 6 +216132.87 2810.0 C57
2021-09-26 08:43:58 S 06 30 34.164 +14 49 20.39 V C57
2021-09-26 08:43:58 s 1 -175486.22 2 +215523.29 7830.0 C57
2021-09-26 08:53:58 S 06 30 34.596 +14 49 21.72 V C57
2021-09-26 08:53:58 s 1 -175645.31 8 +214912.35 9150.0 C57
2021-09-26 09:03:58 S 06 30 35.071 +14 49 18.80 V C57
2021-09-26 09:03:58 s 1 -175803.30 9 +214300.05 6740.0 C57
2021-09-26 09:13:58 S 06 30 35.419 +14 49 17.26 V C57
2021-09-26 09:13:58 s 1 -175960.19 0 +213686.39 590.0 C57
2021-09-26 09:23:58 S 06 30 35.806 +14 49 16.61 V C57
2021-09-26 09:23:58 s 1 -176115.95 6 +213071.37 670.0 C57
2021-09-26 09:33:58 S 06 30 36.209 +14 49 12.76 V C57
2021-09-26 09:33:58 s 1 -176270.60 1 +212454.99 6980.0 C57
2021-09-26 10:53:58 S 06 30 39.631 +14 49 04.04 V C57
2021-09-26 10:53:58 s 1 -177466.78 4 +207474.77 9250.0 C57
2021-09-26 11:03:58 S 06 30 39.833 +14 49 04.62 V C57
2021-09-26 11:03:58 s 1 -177611.10 4 +206846.07 750.0 C57
2021-09-26 11:13:58 S 06 30 40.253 +14 49 01.56 V C57
2021-09-26 11:13:58 s 1 -177754.25 0 +206216.01 8290.0 C57
2021-09-26 11:23:58 S 06 30 40.699 +14 48 59.29 V C57
2021-09-26 11:23:58 s 1 -177896.21 5 +205584.57 1850.0 C57
2021-09-26 11:43:58 S 06 30 41.371 +14 48 56.95 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)