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
2021-09-25 14:43:58 s 1 -152755.38 8 +273763.06 3620.0 C57
2021-09-25 15:33:58 S 06 29 52.572 +14 51 35.39 V C57
2021-09-25 15:33:58 s 1 -154016.13 8 +271395.38 7860.0 C57
2021-09-25 15:43:58 S 06 29 52.982 +14 51 36.90 V C57
2021-09-25 15:43:58 s 1 -154266.20 3 +270918.12 7590.0 C57
2021-09-25 15:53:58 S 06 29 53.455 +14 51 35.28 V C57
2021-09-25 15:53:58 s 1 -154515.56 6 +270439.63 4930.0 C57
2021-09-25 16:03:58 S 06 29 53.904 +14 51 33.12 V C57
2021-09-25 16:03:58 s 1 -154764.22 4 +269959.89 9860.0 C57
2021-09-25 16:13:58 S 06 29 54.166 +14 51 32.11 V C57
2021-09-25 16:13:58 s 1 -155012.17 3 +269478.90 2370.0 C57
2021-09-25 16:23:58 S 06 29 54.677 +14 51 29.81 V C57
2021-09-25 16:23:58 s 1 -155259.41 2 +268996.67 2460.0 C57
2021-09-25 16:33:58 S 06 29 55.025 +14 51 30.38 V C57
2021-09-25 16:33:58 s 1 -155505.93 7 +268513.20 120.0 C57
2021-09-25 16:43:58 S 06 29 55.457 +14 51 29.66 V C57
2021-09-25 16:43:58 s 1 -155751.74 5 +268028.48 5330.0 C57
2021-09-25 16:53:58 S 06 29 55.884 +14 51 27.36 V C57
2021-09-25 16:53:58 s 1 -155996.83 3 +267542.51 8090.0 C57
2021-09-25 17:03:58 S 06 29 56.201 +14 51 27.40 V C57
2021-09-25 17:03:58 s 1 -156241.19 7 +267055.29 8380.0 C57
2021-09-25 18:03:58 S 06 29 58.517 +14 51 19.76 V C57
2021-09-25 18:03:58 s 1 -157692.02 6 +264105.68 7790.0 C57
2021-09-25 18:13:58 S 06 29 59.081 +14 51 16.02 V C57
2021-09-25 18:13:58 s 1 -157931.24 2 +263609.69 540.0 C57
2021-09-25 18:23:58 S 06 29 59.534 +14 51 16.56 V C57
2021-09-25 18:23:58 s 1 -158169.70 9 +263112.44 740.0 C57
2021-09-25 18:33:58 S 06 29 59.959 +14 51 15.55 V C57
2021-09-25 18:33:58 s 1 -158407.42 5 +262613.93 8390.0 C57
2021-09-25 18:43:58 S 06 30 00.276 +14 51 12.82 V C57
2021-09-25 18:43:58 s 1 -158644.38 7 +262114.16 3460.0 C57
2021-09-25 18:53:58 S 06 30 00.595 +14 51 10.94 V C57
2021-09-25 18:53:58 s 1 -158880.59 1 +261613.13 5960.0 C57
2021-09-25 19:03:58 S 06 30 01.051 +14 51 10.66 V C57
2021-09-25 19:03:58 s 1 -159116.03 3 +261110.84 5860.0 C57
2021-09-25 19:13:58 S 06 30 01.550 +14 51 09.94 V C57
2021-09-25 19:13:58 s 1 -159350.71 2 +260607.29 3160.0 C57
2021-09-25 19:23:58 S 06 30 01.759 +14 51 08.21 V C57
2021-09-25 19:23:58 s 1 -159584.62 2 +260102.47 7850.0 C57
2021-09-25 19:33:58 S 06 30 02.076 +14 51 06.23 V C57
2021-09-25 19:33:58 s 1 -159817.76 2 +259596.39 9920.0 C57
2021-09-25 20:33:58 S 06 30 04.656 +14 50 59.86 V C57
2021-09-25 20:33:58 s 1 -161200.22 5 +256533.27 6620.0 C57
2021-09-25 20:43:58 S 06 30 05.146 +14 50 57.73 V C57
2021-09-25 20:43:58 s 1 -161427.87 5 +256018.30 20.0 C57
2021-09-25 21:13:58 S 06 30 06.422 +14 50 53.45 V C57
2021-09-25 21:13:58 s 1 -162106.02 3 +254465.76 3890.0 C57
2021-09-25 21:23:58 S 06 30 06.814 +14 50 51.97 V C57
2021-09-25 21:23:58 s 1 -162330.46 1 +253945.69 6370.0 C57
2021-09-25 21:43:58 S 06 30 07.668 +14 50 48.08 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)