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 20:53:55 s 1 +36211.376 0 +377915.39 2520.0 C57
2021-11-25 21:03:55 S 06 33 35.568 +12 50 54.24 V C57
2021-11-25 21:03:55 s 1 +35860.369 0 +377997.45 6650.0 C57
2021-11-25 21:13:55 S 06 33 35.093 +12 50 55.93 V C57
2021-11-25 21:13:55 s 1 +35509.270 0 +378078.51 590.0 C57
2021-11-25 21:23:55 S 06 33 34.738 +12 50 55.79 V C57
2021-11-25 21:23:55 s 1 +35158.082 0 +378158.57 4350.0 C57
2021-11-25 21:33:54 S 06 33 34.265 +12 50 54.60 V C57
2021-11-25 21:33:54 s 1 +34806.805 0 +378237.64 7910.0 C57
2021-11-25 21:43:55 S 06 33 33.797 +12 50 55.36 V C57
2021-11-25 21:43:55 s 1 +34455.439 0 +378315.72 1300.0 C57
2021-11-25 21:53:54 S 06 33 33.365 +12 50 55.03 V C57
2021-11-25 21:53:54 s 1 +34103.987 0 +378392.79 4500.0 C57
2021-11-25 22:03:55 S 06 33 32.873 +12 50 54.67 V C57
2021-11-25 22:03:55 s 1 +33752.448 0 +378468.88 7530.0 C57
2021-11-25 22:13:54 S 06 33 32.472 +12 50 54.28 V C57
2021-11-25 22:13:54 s 1 +33400.824 0 +378543.96 390.0 C57
2021-11-25 22:23:55 S 06 33 31.987 +12 50 55.14 V C57
2021-11-25 22:23:55 s 1 +33049.116 0 +378618.06 3090.0 C57
2021-11-25 22:33:55 S 06 33 31.584 +12 50 54.96 V C57
2021-11-25 22:33:55 s 1 +32697.325 0 +378691.16 5620.0 C57
2021-11-25 22:43:55 S 06 33 31.018 +12 50 54.85 V C57
2021-11-25 22:43:55 s 1 +32345.451 0 +378763.26 7990.0 C57
2021-11-25 22:53:55 S 06 33 30.658 +12 50 54.85 V C57
2021-11-25 22:53:55 s 1 +31993.496 0 +378834.37 210.0 C57
2021-11-25 23:03:54 S 06 33 30.319 +12 50 55.57 V C57
2021-11-25 23:03:54 s 1 +31641.461 0 +378904.48 2270.0 C57
2021-11-25 23:13:55 S 06 33 29.618 +12 50 56.29 V C57
2021-11-25 23:13:55 s 1 +31289.346 0 +378973.60 4190.0 C57
2021-11-25 23:23:54 S 06 33 29.230 +12 50 57.12 V C57
2021-11-25 23:23:54 s 1 +30937.153 0 +379041.73 5960.0 C57
2021-11-25 23:33:55 S 06 33 28.750 +12 50 53.23 V C57
2021-11-25 23:33:55 s 1 +30584.883 0 +379108.86 7590.0 C57
2021-11-25 23:43:54 S 06 33 28.322 +12 50 55.18 V C57
2021-11-25 23:43:54 s 1 +30232.536 0 +379175.00 9090.0 C57
2021-11-25 23:53:55 S 06 33 27.955 +12 50 55.90 V C57
2021-11-25 23:53:55 s 1 +29880.113 0 +379240.14 450.0 C57
2021-11-26 00:03:55 S 06 33 27.569 +12 50 55.43 V C57
2021-11-26 00:03:55 s 1 +29527.616 0 +379304.29 1680.0 C57
2021-11-26 00:13:55 S 06 33 27.053 +12 50 54.78 V C57
2021-11-26 00:13:55 s 1 +29175.046 0 +379367.45 2780.0 C57
2021-11-26 00:23:55 S 06 33 26.590 +12 50 56.18 V C57
2021-11-26 00:23:55 s 1 +28822.403 0 +379429.61 3770.0 C57
2021-11-26 00:33:54 S 06 33 26.131 +12 50 55.03 V C57
2021-11-26 00:33:54 s 1 +28469.688 0 +379490.78 4630.0 C57
2021-11-26 00:43:55 S 06 33 25.656 +12 50 55.39 V C57
2021-11-26 00:43:55 s 1 +28116.902 0 +379550.96 5380.0 C57
2021-11-26 00:53:54 S 06 33 25.272 +12 50 55.90 V C57
2021-11-26 00:53:54 s 1 +27764.047 0 +379610.14 6020.0 C57
2021-11-26 01:03:55 S 06 33 24.852 +12 50 55.93 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)