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
2021-09-22 19:23:58 s 1 -16718.226 0 +370775.51 4230.0 C57
2021-09-22 19:33:58 S 06 27 02.203 +15 00 21.78 V C57
2021-09-22 19:33:58 s 1 -17096.635 0 +370753.06 7790.0 C57
2021-09-22 19:43:58 S 06 27 02.546 +15 00 20.81 V C57
2021-09-22 19:43:58 s 1 -17475.000 0 +370729.57 1140.0 C57
2021-09-22 20:23:58 S 06 27 04.164 +15 00 15.73 V C57
2021-09-22 20:23:58 s 1 -18987.996 0 +370625.05 2320.0 C57
2021-09-22 20:43:58 S 06 27 05.052 +15 00 10.98 V C57
2021-09-22 20:43:58 s 1 -19744.199 0 +370566.47 6540.0 C57
2021-09-22 21:03:58 S 06 27 05.770 +15 00 09.90 V C57
2021-09-22 21:03:58 s 1 -20500.195 0 +370503.68 9810.0 C57
2021-09-22 21:13:58 S 06 27 06.398 +15 00 07.88 V C57
2021-09-22 21:13:58 s 1 -20878.112 0 +370470.70 1080.0 C57
2021-09-22 21:23:58 S 06 27 06.672 +15 00 07.60 V C57
2021-09-22 21:23:58 s 1 -21255.975 0 +370436.67 2090.0 C57
2021-09-22 21:33:58 S 06 27 07.003 +15 00 03.53 V C57
2021-09-22 21:33:58 s 1 -21633.781 0 +370401.59 2860.0 C57
2021-09-22 21:43:58 S 06 27 07.786 +15 00 05.87 V C57
2021-09-22 21:43:58 s 1 -22011.530 0 +370365.45 3360.0 C57
2021-09-22 21:53:58 S 06 27 08.057 +15 00 06.77 V C57
2021-09-22 21:53:58 s 1 -22389.221 0 +370328.26 3610.0 C57
2021-09-22 22:53:58 S 06 27 10.747 +14 59 57.16 V C57
2021-09-22 22:53:58 s 1 -24654.080 0 +370083.00 9440.0 C57
2021-09-22 23:03:58 S 06 27 10.932 +14 59 56.00 V C57
2021-09-22 23:03:58 s 1 -25031.332 0 +370038.43 7760.0 C57
2021-09-22 23:13:58 S 06 27 11.618 +14 59 55.64 V C57
2021-09-22 23:13:58 s 1 -25408.517 0 +369992.82 5800.0 C57
2021-09-22 23:23:58 S 06 27 11.918 +14 59 53.52 V C57
2021-09-22 23:23:58 s 1 -25785.635 0 +369946.15 3550.0 C57
2021-09-22 23:33:58 S 06 27 12.336 +14 59 51.65 V C57
2021-09-22 23:33:58 s 1 -26162.683 0 +369898.42 1000.0 C57
2021-09-22 23:43:58 S 06 27 12.521 +14 59 50.96 V C57
2021-09-22 23:43:58 s 1 -26539.662 0 +369849.65 8140.0 C57
2021-09-22 23:53:58 S 06 27 13.243 +14 59 48.62 V C57
2021-09-22 23:53:58 s 1 -26916.569 0 +369799.81 4990.0 C57
2021-09-23 00:03:58 S 06 27 13.738 +14 59 47.51 V C57
2021-09-23 00:03:58 s 1 -27293.403 0 +369748.93 1530.0 C57
2021-09-23 00:13:58 S 06 27 13.966 +14 59 44.45 V C57
2021-09-23 00:13:58 s 1 -27670.165 0 +369696.99 7760.0 C57
2021-09-23 00:33:58 S 06 27 15.125 +14 59 40.78 V C57
2021-09-23 00:33:58 s 1 -28423.463 0 +369589.96 9270.0 C57
2021-09-23 01:23:58 S 06 27 16.858 +14 59 36.49 V C57
2021-09-23 01:23:58 s 1 -30305.349 0 +369303.92 2370.0 C57
2021-09-23 01:33:58 S 06 27 17.357 +14 59 34.26 V C57
2021-09-23 01:33:58 s 1 -30681.484 0 +369243.56 5980.0 C57
2021-09-23 04:13:58 S 06 27 24.444 +14 59 13.38 V C57
2021-09-23 04:13:58 s 1 -36687.605 0 +368134.31 4690.0 C57
2021-09-23 04:23:58 S 06 27 24.758 +14 59 14.17 V C57
2021-09-23 04:23:58 s 1 -37062.180 0 +368056.02 1980.0 C57
2021-09-23 04:33:58 S 06 27 25.097 +14 59 12.16 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)