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
2021-09-20 15:43:58 s 1 +97108.917 0 +325852.45 6640.0 C57
2021-09-20 15:53:58 S 06 24 44.465 +15 06 29.30 V C57
2021-09-20 15:53:58 s 1 +96772.837 0 +326170.31 5070.0 C57
2021-09-20 16:03:58 S 06 24 45.060 +15 06 30.67 V C57
2021-09-20 16:03:58 s 1 +96436.405 0 +326486.97 2390.0 C57
2021-09-20 16:13:58 S 06 24 45.499 +15 06 26.64 V C57
2021-09-20 16:13:58 s 1 +96099.622 0 +326802.46 8600.0 C57
2021-09-20 16:23:58 S 06 24 45.953 +15 06 26.10 V C57
2021-09-20 16:23:58 s 1 +95762.490 0 +327116.76 3700.0 C57
2021-09-20 16:33:58 S 06 24 46.426 +15 06 25.60 V C57
2021-09-20 16:33:58 s 1 +95425.011 0 +327429.88 7700.0 C57
2021-09-20 17:53:58 S 06 24 49.843 +15 06 12.85 V C57
2021-09-20 17:53:58 s 1 +92712.907 0 +329892.39 890.0 C57
2021-09-20 18:03:58 S 06 24 50.628 +15 06 16.06 V C57
2021-09-20 18:03:58 s 1 +92372.386 0 +330194.91 5280.0 C57
2021-09-20 18:13:58 S 06 24 51.041 +15 06 15.77 V C57
2021-09-20 18:13:58 s 1 +92031.536 0 +330496.26 8620.0 C57
2021-09-20 18:23:58 S 06 24 51.422 +15 06 11.63 V C57
2021-09-20 18:23:58 s 1 +91690.358 0 +330796.43 930.0 C57
2021-09-20 18:33:58 S 06 24 51.871 +15 06 11.95 V C57
2021-09-20 18:33:58 s 1 +91348.854 0 +331095.43 2210.0 C57
2021-09-20 18:43:58 S 06 24 52.234 +15 06 08.60 V C57
2021-09-20 18:43:58 s 1 +91007.026 0 +331393.26 2470.0 C57
2021-09-20 18:53:58 S 06 24 52.774 +15 06 07.52 V C57
2021-09-20 18:53:58 s 1 +90664.876 0 +331689.92 1710.0 C57
2021-09-20 19:03:58 S 06 24 53.150 +15 06 08.64 V C57
2021-09-20 19:03:58 s 1 +90322.405 0 +331985.41 9940.0 C57
2021-09-20 19:13:58 S 06 24 53.662 +15 06 06.12 V C57
2021-09-20 19:13:58 s 1 +89979.615 0 +332279.74 7170.0 C57
2021-09-20 19:23:58 S 06 24 54.156 +15 06 04.97 V C57
2021-09-20 19:23:58 s 1 +89636.507 0 +332572.89 3390.0 C57
2021-09-20 19:33:58 S 06 24 54.571 +15 06 03.28 V C57
2021-09-20 19:33:58 s 1 +89293.084 0 +332864.88 8620.0 C57
2021-09-20 20:33:58 S 06 24 57.168 +15 05 55.75 V C57
2021-09-20 20:33:58 s 1 +87226.010 0 +334592.35 9460.0 C57
2021-09-20 20:43:58 S 06 24 57.715 +15 05 53.95 V C57
2021-09-20 20:43:58 s 1 +86880.424 0 +334876.19 7890.0 C57
2021-09-20 20:53:58 S 06 24 58.224 +15 05 55.97 V C57
2021-09-20 20:53:58 s 1 +86534.536 0 +335158.87 5370.0 C57
2021-09-20 21:03:58 S 06 24 58.565 +15 05 55.64 V C57
2021-09-20 21:03:58 s 1 +86188.347 0 +335440.39 1910.0 C57
2021-09-20 21:13:58 S 06 24 59.045 +15 05 52.62 V C57
2021-09-20 21:13:58 s 1 +85841.859 0 +335720.76 7510.0 C57
2021-09-20 21:23:58 S 06 24 59.599 +15 05 52.76 V C57
2021-09-20 21:23:58 s 1 +85495.074 0 +335999.96 2170.0 C57
2021-09-20 21:33:58 S 06 25 00.065 +15 05 51.86 V C57
2021-09-20 21:33:58 s 1 +85147.993 0 +336278.01 5910.0 C57
2021-09-20 21:43:58 S 06 25 00.432 +15 05 49.81 V C57
2021-09-20 21:43:58 s 1 +84800.617 0 +336554.90 8730.0 C57
2021-09-20 21:53:58 S 06 25 00.790 +15 05 49.02 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)