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 11:43:58 s 1 -178176.58 3 +204317.56 6970.0 C57
2021-09-26 11:53:58 S 06 30 41.899 +14 48 57.74 V C57
2021-09-26 11:53:58 s 1 -178314.97 4 +203681.99 8500.0 C57
2021-09-26 12:03:58 S 06 30 42.245 +14 48 55.91 V C57
2021-09-26 12:03:58 s 1 -178452.16 2 +203045.03 5970.0 C57
2021-09-26 12:13:58 S 06 30 42.672 +14 48 51.91 V C57
2021-09-26 12:13:58 s 1 -178588.14 2 +202406.70 9370.0 C57
2021-09-26 13:03:58 S 06 30 44.729 +14 48 46.15 V C57
2021-09-26 13:03:58 s 1 -179249.71 1 +199194.29 4660.0 C57
2021-09-26 13:13:58 S 06 30 44.988 +14 48 45.61 V C57
2021-09-26 13:13:58 s 1 -179378.31 7 +198547.65 3230.0 C57
2021-09-26 13:23:58 S 06 30 45.377 +14 48 43.96 V C57
2021-09-26 13:23:58 s 1 -179505.67 3 +197899.62 7600.0 C57
2021-09-26 13:33:58 S 06 30 45.876 +14 48 41.83 V C57
2021-09-26 13:33:58 s 1 -179631.77 4 +197250.19 7740.0 C57
2021-09-26 13:43:58 S 06 30 46.327 +14 48 42.70 V C57
2021-09-26 13:43:58 s 1 -179756.61 3 +196599.38 3640.0 C57
2021-09-26 13:53:58 S 06 30 46.661 +14 48 39.60 V C57
2021-09-26 13:53:58 s 1 -179880.18 3 +195947.18 5270.0 C57
2021-09-26 14:03:58 S 06 30 47.122 +14 48 39.17 V C57
2021-09-26 14:03:58 s 1 -180002.48 0 +195293.58 2610.0 C57
2021-09-26 14:13:58 S 06 30 47.638 +14 48 37.98 V C57
2021-09-26 14:13:58 s 1 -180123.49 6 +194638.59 5650.0 C57
2021-09-26 14:23:58 S 06 30 47.834 +14 48 34.42 V C57
2021-09-26 14:23:58 s 1 -180243.22 5 +193982.20 4350.0 C57
2021-09-26 14:33:58 S 06 30 48.113 +14 48 32.98 V C57
2021-09-26 14:33:58 s 1 -180361.66 2 +193324.41 8710.0 C57
2021-09-26 14:43:58 S 06 30 48.727 +14 48 35.50 V C57
2021-09-26 14:43:58 s 1 -180478.79 9 +192665.23 8700.0 C57
2021-09-26 15:23:58 S 06 30 50.273 +14 48 26.28 V C57
2021-09-26 15:23:58 s 1 -180934.22 8 +190014.50 4520.0 C57
2021-09-26 18:13:58 S 06 30 57.113 +14 48 02.74 V C57
2021-09-26 18:13:58 s 1 -182626.90 4 +178497.48 440.0 C57
2021-09-26 18:23:58 S 06 30 57.564 +14 48 04.50 V C57
2021-09-26 18:23:58 s 1 -182713.77 1 +177807.27 8710.0 C57
2021-09-26 18:43:58 S 06 30 58.308 +14 48 01.76 V C57
2021-09-26 18:43:58 s 1 -182883.12 7 +176422.57 550.0 C57
2021-09-26 18:53:58 S 06 30 58.754 +14 47 58.78 V C57
2021-09-26 18:53:58 s 1 -182965.60 1 +175728.08 4080.0 C57
2021-09-26 19:03:58 S 06 30 59.258 +14 47 58.09 V C57
2021-09-26 19:03:58 s 1 -183046.59 7 +175032.17 2640.0 C57
2021-09-26 19:13:58 S 06 30 59.710 +14 47 58.56 V C57
2021-09-26 19:13:58 s 1 -183126.10 5 +174334.83 6210.0 C57
2021-09-26 19:23:58 S 06 30 59.849 +14 47 55.90 V C57
2021-09-26 19:23:58 s 1 -183204.11 9 +173636.06 4770.0 C57
2021-09-26 20:33:58 S 06 31 02.597 +14 47 46.93 V C57
2021-09-26 20:33:58 s 1 -183707.72 6 +168704.65 2100.0 C57
2021-09-26 20:43:58 S 06 31 03.137 +14 47 44.70 V C57
2021-09-26 20:43:58 s 1 -183773.50 5 +167994.43 9620.0 C57
2021-09-26 20:53:58 S 06 31 03.535 +14 47 43.58 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)