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
2021-10-06 02:13:57 s 1 -18402.615 0 +370609.08 5060.0 C57
2021-10-06 02:23:58 S 06 39 11.947 +14 21 56.56 V C57
2021-10-06 02:23:58 s 1 -18774.452 0 +370555.67 3020.0 C57
2021-10-06 03:23:58 S 06 39 13.586 +14 21 52.63 V C57
2021-10-06 03:23:58 s 1 -21004.075 0 +370213.26 5250.0 C57
2021-10-06 03:33:58 S 06 39 13.762 +14 21 47.99 V C57
2021-10-06 03:33:58 s 1 -21375.437 0 +370152.52 1330.0 C57
2021-10-06 03:43:57 S 06 39 14.114 +14 21 48.78 V C57
2021-10-06 03:43:57 s 1 -21746.727 0 +370090.74 7120.0 C57
2021-10-06 03:53:58 S 06 39 14.496 +14 21 46.55 V C57
2021-10-06 03:53:58 s 1 -22117.944 0 +370027.91 2630.0 C57
2021-10-06 04:03:57 S 06 39 14.820 +14 21 45.47 V C57
2021-10-06 04:03:57 s 1 -22489.087 0 +369964.02 7850.0 C57
2021-10-06 04:13:58 S 06 39 14.923 +14 21 44.64 V C57
2021-10-06 04:13:58 s 1 -22860.154 0 +369899.09 2770.0 C57
2021-10-06 04:23:57 S 06 39 15.274 +14 21 43.06 V C57
2021-10-06 04:23:57 s 1 -23231.145 0 +369833.12 7390.0 C57
2021-10-06 04:33:58 S 06 39 15.655 +14 21 40.82 V C57
2021-10-06 04:33:58 s 1 -23602.059 0 +369766.09 1720.0 C57
2021-10-06 04:43:57 S 06 39 15.874 +14 21 39.46 V C57
2021-10-06 04:43:57 s 1 -23972.895 0 +369698.01 5730.0 C57
2021-10-06 05:43:58 S 06 39 17.688 +14 21 35.32 V C57
2021-10-06 05:43:58 s 1 -26196.204 0 +369267.52 3240.0 C57
2021-10-06 05:53:57 S 06 39 17.868 +14 21 31.39 V C57
2021-10-06 05:53:57 s 1 -26566.461 0 +369192.10 5030.0 C57
2021-10-06 06:03:58 S 06 39 18.338 +14 21 31.14 V C57
2021-10-06 06:03:58 s 1 -26936.631 0 +369115.63 6480.0 C57
2021-10-06 06:13:57 S 06 39 18.566 +14 21 29.92 V C57
2021-10-06 06:13:57 s 1 -27306.714 0 +369038.10 7590.0 C57
2021-10-06 06:23:57 S 06 39 18.775 +14 21 27.94 V C57
2021-10-06 06:23:57 s 1 -27676.707 0 +368959.53 8370.0 C57
2021-10-06 06:33:58 S 06 39 19.126 +14 21 28.01 V C57
2021-10-06 06:33:58 s 1 -28046.610 0 +368879.91 8800.0 C57
2021-10-06 06:43:57 S 06 39 19.294 +14 21 23.36 V C57
2021-10-06 06:43:57 s 1 -28416.422 0 +368799.23 8880.0 C57
2021-10-06 06:53:58 S 06 39 19.594 +14 21 21.46 V C57
2021-10-06 06:53:58 s 1 -28786.142 0 +368717.51 8610.0 C57
2021-10-06 07:03:57 S 06 39 19.985 +14 21 19.22 V C57
2021-10-06 07:03:57 s 1 -29155.769 0 +368634.73 7980.0 C57
2021-10-06 08:23:58 S 06 39 22.231 +14 21 11.88 V C57
2021-10-06 08:23:58 s 1 -32109.292 0 +367934.67 9780.0 C57
2021-10-06 08:33:57 S 06 39 22.397 +14 21 10.08 V C57
2021-10-06 08:33:57 s 1 -32478.030 0 +367842.42 5810.0 C57
2021-10-06 08:43:58 S 06 39 22.704 +14 21 10.19 V C57
2021-10-06 08:43:58 s 1 -32846.664 0 +367749.13 1430.0 C57
2021-10-06 08:53:57 S 06 39 23.100 +14 21 07.81 V C57
2021-10-06 08:53:57 s 1 -33215.192 0 +367654.78 6670.0 C57
2021-10-06 09:03:58 S 06 39 23.311 +14 21 07.99 V C57
2021-10-06 09:03:58 s 1 -33583.615 0 +367559.38 1500.0 C57
2021-10-06 09:13:57 S 06 39 23.606 +14 21 04.36 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)