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
2021-11-14 07:43:55 S 06 43 01.860 +12 53 58.56 V C57
2021-11-14 07:43:55 s 1 -45490.184 0 +369180.68 5250.0 C57
2021-11-14 07:53:55 S 06 43 01.570 +12 53 57.80 V C57
2021-11-14 07:53:55 s 1 -45837.837 0 +369035.92 510.0 C57
2021-11-14 08:03:55 S 06 43 01.361 +12 53 56.54 V C57
2021-11-14 08:03:55 s 1 -46185.362 0 +368890.14 5160.0 C57
2021-11-14 08:13:55 S 06 43 01.010 +12 53 55.21 V C57
2021-11-14 08:13:55 s 1 -46532.760 0 +368743.33 9190.0 C57
2021-11-14 08:33:55 S 06 43 00.523 +12 53 56.29 V C57
2021-11-14 08:33:55 s 1 -47227.168 0 +368446.64 5380.0 C57
2021-11-14 09:53:55 S 06 42 58.265 +12 53 50.78 V C57
2021-11-14 09:53:55 s 1 -49999.461 0 +367218.82 4450.0 C57
2021-11-14 10:03:55 S 06 42 57.886 +12 53 51.29 V C57
2021-11-14 10:03:55 s 1 -50345.379 0 +367060.72 1370.0 C57
2021-11-14 10:13:55 S 06 42 57.600 +12 53 50.17 V C57
2021-11-14 10:13:55 s 1 -50691.157 0 +366901.59 7630.0 C57
2021-11-14 10:23:55 S 06 42 57.341 +12 53 49.60 V C57
2021-11-14 10:23:55 s 1 -51036.792 0 +366741.42 3210.0 C57
2021-11-14 10:33:55 S 06 42 57.096 +12 53 49.45 V C57
2021-11-14 10:33:55 s 1 -51382.285 0 +366580.23 8120.0 C57
2021-11-14 10:43:55 S 06 42 56.827 +12 53 49.56 V C57
2021-11-14 10:43:55 s 1 -51727.633 0 +366418.01 2340.0 C57
2021-11-14 12:13:55 S 06 42 54.242 +12 53 43.55 V C57
2021-11-14 12:13:55 s 1 -54829.094 0 +364911.55 8850.0 C57
2021-11-14 12:33:55 S 06 42 53.743 +12 53 43.94 V C57
2021-11-14 12:33:55 s 1 -55516.627 0 +364565.41 2420.0 C57
2021-11-14 12:43:55 S 06 42 53.400 +12 53 43.48 V C57
2021-11-14 12:43:55 s 1 -55860.158 0 +364390.79 8110.0 C57
2021-11-14 12:53:55 S 06 42 53.110 +12 53 42.97 V C57
2021-11-14 12:53:55 s 1 -56203.531 0 +364215.13 3050.0 C57
2021-11-14 13:03:55 S 06 42 52.942 +12 53 42.76 V C57
2021-11-14 13:03:55 s 1 -56546.744 0 +364038.43 7250.0 C57
2021-11-14 13:13:55 S 06 42 52.596 +12 53 42.36 V C57
2021-11-14 13:13:55 s 1 -56889.795 0 +363860.70 710.0 C57
2021-11-14 14:33:55 S 06 42 50.407 +12 53 38.69 V C57
2021-11-14 14:33:55 s 1 -59628.280 0 +362401.44 870.0 C57
2021-11-14 14:43:55 S 06 42 50.033 +12 53 37.28 V C57
2021-11-14 14:43:55 s 1 -59969.832 0 +362214.35 7390.0 C57
2021-11-14 14:53:55 S 06 42 49.800 +12 53 35.95 V C57
2021-11-14 14:53:55 s 1 -60311.213 0 +362026.21 3120.0 C57
2021-11-14 15:03:55 S 06 42 49.481 +12 53 36.38 V C57
2021-11-14 15:03:55 s 1 -60652.419 0 +361837.04 8060.0 C57
2021-11-14 15:13:55 S 06 42 49.142 +12 53 35.30 V C57
2021-11-14 15:13:55 s 1 -60993.451 0 +361646.82 2190.0 C57
2021-11-14 15:23:55 S 06 42 48.910 +12 53 35.09 V C57
2021-11-14 15:23:55 s 1 -61334.307 0 +361455.56 5510.0 C57
2021-11-14 15:33:55 S 06 42 48.600 +12 53 34.69 V C57
2021-11-14 15:33:55 s 1 -61674.986 0 +361263.26 8030.0 C57
2021-11-14 15:43:55 S 06 42 48.278 +12 53 34.12 V C57
2021-11-14 15:43:55 s 1 -62015.487 0 +361069.91 9730.0 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)