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
2021-09-19 04:33:58 s 1 +156514.29 9 +230553.25 1740.0 C57
2021-09-19 04:43:58 S 06 23 06.086 +15 10 19.81 V C57
2021-09-19 04:43:58 s 1 +156308.35 9 +231147.13 1560.0 C57
2021-09-19 04:53:58 S 06 23 06.662 +15 10 17.44 V C57
2021-09-19 04:53:58 s 1 +156101.43 2 +231739.56 8150.0 C57
2021-09-19 05:03:58 S 06 23 07.056 +15 10 17.22 V C57
2021-09-19 05:03:58 s 1 +155893.52 6 +232330.52 1540.0 C57
2021-09-19 05:13:58 S 06 23 07.658 +15 10 15.96 V C57
2021-09-19 05:13:58 s 1 +155684.64 4 +232920.03 1740.0 C57
2021-09-19 06:13:58 S 06 23 10.483 +15 10 13.55 V C57
2021-09-19 06:13:58 s 1 +154411.14 0 +236426.53 6900.0 C57
2021-09-19 06:23:58 S 06 23 10.963 +15 10 09.01 V C57
2021-09-19 06:23:58 s 1 +154195.56 6 +237005.87 5240.0 C57
2021-09-19 06:33:58 S 06 23 11.273 +15 10 08.04 V C57
2021-09-19 06:33:58 s 1 +153979.05 5 +237583.77 520.0 C57
2021-09-19 06:43:58 S 06 23 11.875 +15 10 07.21 V C57
2021-09-19 06:43:58 s 1 +153761.61 2 +238160.23 2750.0 C57
2021-09-19 06:53:58 S 06 23 12.355 +15 10 07.93 V C57
2021-09-19 06:53:58 s 1 +153543.24 1 +238735.24 1950.0 C57
2021-09-19 07:03:58 S 06 23 12.931 +15 10 03.94 V C57
2021-09-19 07:03:58 s 1 +153323.94 7 +239308.82 8140.0 C57
2021-09-19 07:13:58 S 06 23 13.358 +15 10 03.54 V C57
2021-09-19 07:13:58 s 1 +153103.73 5 +239880.96 1330.0 C57
2021-09-19 07:23:58 S 06 23 13.978 +15 10 03.14 V C57
2021-09-19 07:23:58 s 1 +152882.60 9 +240451.66 1540.0 C57
2021-09-19 07:33:58 S 06 23 14.170 +15 10 01.63 V C57
2021-09-19 07:33:58 s 1 +152660.57 4 +241020.93 8780.0 C57
2021-09-19 07:43:58 S 06 23 14.810 +15 10 00.84 V C57
2021-09-19 07:43:58 s 1 +152437.63 4 +241588.76 3060.0 C57
2021-09-19 08:23:58 S 06 23 16.666 +15 09 57.74 V C57
2021-09-19 08:23:58 s 1 +151536.91 8 +243845.80 970.0 C57
2021-09-19 08:33:58 S 06 23 17.227 +15 09 56.70 V C57
2021-09-19 08:33:58 s 1 +151309.52 1 +244406.50 710.0 C57
2021-09-19 08:43:58 S 06 23 17.330 +15 09 54.32 V C57
2021-09-19 08:43:58 s 1 +151081.24 7 +244965.77 7590.0 C57
2021-09-19 08:53:58 S 06 23 17.885 +15 09 55.33 V C57
2021-09-19 08:53:58 s 1 +150852.09 9 +245523.63 1610.0 C57
2021-09-19 09:03:58 S 06 23 18.605 +15 09 51.55 V C57
2021-09-19 09:03:58 s 1 +150622.08 1 +246080.06 2800.0 C57
2021-09-19 09:13:58 S 06 23 18.962 +15 09 52.92 V C57
2021-09-19 09:13:58 s 1 +150391.19 8 +246635.07 1170.0 C57
2021-09-19 09:23:58 S 06 23 19.466 +15 09 50.80 V C57
2021-09-19 09:23:58 s 1 +150159.45 5 +247188.67 6720.0 C57
2021-09-19 09:33:58 S 06 23 19.992 +15 09 48.20 V C57
2021-09-19 09:33:58 s 1 +149926.85 4 +247740.86 9490.0 C57
2021-09-19 09:43:58 S 06 23 20.446 +15 09 45.58 V C57
2021-09-19 09:43:58 s 1 +149693.40 2 +248291.63 9470.0 C57
2021-09-19 09:53:58 S 06 23 21.127 +15 09 48.42 V C57
2021-09-19 09:53:58 s 1 +149459.10 0 +248840.99 6690.0 C57
2021-09-19 11:03:58 S 06 23 24.358 +15 09 39.42 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)