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 18:23:57 s 1 -54011.463 0 +360528.91 2370.0 C57
2021-10-06 18:33:58 S 06 39 39.612 +14 19 46.81 V C57
2021-10-06 18:33:58 s 1 -54371.985 0 +360373.08 8330.0 C57
2021-10-06 20:33:57 S 06 39 42.406 +14 19 26.69 V C57
2021-10-06 20:33:57 s 1 -58684.511 0 +358419.62 570.0 C57
2021-10-06 20:53:57 S 06 39 43.282 +14 19 31.30 V C57
2021-10-06 20:53:57 s 1 -59400.716 0 +358079.04 5130.0 C57
2021-10-06 21:03:57 S 06 39 43.442 +14 19 26.62 V C57
2021-10-06 21:03:57 s 1 -59758.536 0 +357907.14 1410.0 C57
2021-10-06 21:13:57 S 06 39 43.987 +14 19 31.12 V C57
2021-10-06 21:13:57 s 1 -60116.166 0 +357734.17 7000.0 C57
2021-10-06 22:33:57 S 06 39 46.145 +14 19 18.05 V C57
2021-10-06 22:33:57 s 1 -62970.235 0 +356311.66 6850.0 C57
2021-10-06 22:43:57 S 06 39 46.385 +14 19 15.13 V C57
2021-10-06 22:43:57 s 1 -63326.103 0 +356129.00 6150.0 C57
2021-10-06 22:53:57 S 06 39 46.711 +14 19 15.92 V C57
2021-10-06 22:53:57 s 1 -63681.769 0 +355945.26 4730.0 C57
2021-10-06 23:03:58 S 06 39 46.978 +14 19 16.25 V C57
2021-10-06 23:03:58 s 1 -64037.232 0 +355760.44 2590.0 C57
2021-10-06 23:13:57 S 06 39 47.230 +14 19 13.26 V C57
2021-10-06 23:13:57 s 1 -64392.491 0 +355574.55 9730.0 C57
2021-10-06 23:23:58 S 06 39 47.484 +14 19 11.96 V C57
2021-10-06 23:23:58 s 1 -64747.544 0 +355387.58 6130.0 C57
2021-10-06 23:33:57 S 06 39 47.856 +14 19 13.30 V C57
2021-10-06 23:33:57 s 1 -65102.390 0 +355199.52 1790.0 C57
2021-10-06 23:43:57 S 06 39 48.034 +14 19 09.01 V C57
2021-10-06 23:43:57 s 1 -65457.028 0 +355010.39 6710.0 C57
2021-10-06 23:53:57 S 06 39 48.290 +14 19 06.49 V C57
2021-10-06 23:53:57 s 1 -65811.456 0 +354820.18 890.0 C57
2021-10-07 00:03:57 S 06 39 48.614 +14 19 06.56 V C57
2021-10-07 00:03:57 s 1 -66165.674 0 +354628.88 4320.0 C57
2021-10-07 01:03:57 S 06 39 50.186 +14 18 59.36 V C57
2021-10-07 01:03:57 s 1 -68286.485 0 +353458.39 8910.0 C57
2021-10-07 01:13:57 S 06 39 50.477 +14 18 57.82 V C57
2021-10-07 01:13:57 s 1 -68639.193 0 +353259.51 6970.0 C57
2021-10-07 01:23:57 S 06 39 50.765 +14 18 55.48 V C57
2021-10-07 01:23:57 s 1 -68991.680 0 +353059.56 4250.0 C57
2021-10-07 01:43:57 S 06 39 51.314 +14 18 53.78 V C57
2021-10-07 01:43:57 s 1 -69695.986 0 +352656.38 6440.0 C57
2021-10-07 01:53:57 S 06 39 51.703 +14 18 51.05 V C57
2021-10-07 01:53:57 s 1 -70047.802 0 +352453.17 1350.0 C57
2021-10-07 02:13:57 S 06 39 52.157 +14 18 49.28 V C57
2021-10-07 02:13:57 s 1 -70750.757 0 +352043.48 8750.0 C57
2021-10-07 02:23:57 S 06 39 52.457 +14 18 46.94 V C57
2021-10-07 02:23:57 s 1 -71101.892 0 +351837.01 1240.0 C57
2021-10-07 02:35:57 C 06 39 53.37 +14 17 55.4 V 089
2021-10-07 02:55:57 C 06 39 53.98 +14 17 52.0 V 089
2021-10-07 03:33:58 S 06 39 54.564 +14 18 41.54 V C57
2021-10-07 03:33:58 s 1 -73553.329 0 +350361.21 5620.0 C57
2021-10-07 03:43:57 S 06 39 54.595 +14 18 36.00 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)