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
2024-01-13 05:16:48 C 00 12 16.574 -07 18 50.00 V T08
2024-01-13 05:33:55 C 00 12 18.367 -07 18 36.86 V T08
2024-01-15 03:17:04 C 00 17 05.539 -06 44 22.52 V 703
2024-01-15 03:20:24 C 00 17 05.903 -06 44 19.97 V 703
2024-01-15 03:23:44 C 00 17 06.234 -06 44 17.81 V 703
2024-01-15 03:27:04 C 00 17 06.583 -06 44 14.93 V 703
2024-01-17 04:57:35 C 00 22 14.381 -06 07 26.15 V T08
2024-01-17 05:01:44 C 00 22 14.784 -06 07 23.23 V T08
2024-01-17 05:10:45 C 00 22 15.682 -06 07 16.36 V T08
2024-01-17 05:27:58 C 00 22 17.450 -06 07 03.58 V T08
2024-01-17 05:30:04 C 00 22 17.664 -06 07 02.03 V T08
2024-01-20 17:35:27 C 00 30 52.98 -05 05 18.8 X G02
2024-01-20 17:41:19 C 00 30 53.56 -05 05 15.0 X G02
2024-01-20 17:46:54 C 00 30 54.12 -05 05 10.9 X G02
2024-01-21 05:32:06 C 00 32 05.366 -04 56 35.74 V T08
2024-01-21 05:32:46 C 00 32 05.436 -04 56 35.02 V T08
2024-01-21 05:36:11 C 00 32 05.770 -04 56 32.78 V T08
2024-01-21 05:37:36 C 00 32 05.921 -04 56 31.81 V T08
2024-01-21 05:46:35 C 00 32 06.833 -04 56 25.12 V T08
2024-01-21 05:47:15 C 00 32 06.878 -04 56 24.94 V T08
2024-01-21 06:02:49 C 00 32 08.438 -04 56 13.20 V T08
2024-01-22 06:26:25 C 00 34 35.868 -04 38 32.46 V T08
2024-01-22 06:40:56 C 00 34 37.310 -04 38 21.77 V T08
2024-01-22 06:47:00 C 00 34 37.918 -04 38 17.52 V T08
2024-01-22 06:57:18 C 00 34 38.942 -04 38 09.85 V T08
2024-01-23 05:13:46 C 00 36 53.064 -04 22 06.10 V T05
2024-01-23 05:18:59 C 00 36 53.575 -04 22 02.39 V T05
2024-01-23 05:26:48 C 00 36 54.350 -04 21 56.74 V T05
2024-01-23 05:43:31 C 00 36 56.004 -04 21 44.57 V T05
2024-01-27 05:13:40 C 00 46 24.317 -03 13 41.63 V T05
2024-01-27 05:18:52 C 00 46 24.818 -03 13 37.96 V T05
2024-01-27 05:26:48 C 00 46 25.589 -03 13 32.27 V T05
2024-01-27 05:42:07 C 00 46 27.084 -03 13 21.54 V T05
2024-01-28 16:47:16 C 00 49 53.55 -02 48 44.6 X G02
2024-01-28 16:52:01 C 00 49 54.01 -02 48 41.3 X G02
2024-01-28 16:56:30 C 00 49 54.44 -02 48 38.3 X G02
2024-01-29 02:10:28 C 00 50 48.476 -02 42 09.86 V 703
2024-01-29 02:13:50 C 00 50 48.800 -02 42 07.60 V 703
2024-01-29 02:17:10 C 00 50 49.103 -02 42 05.26 V 703
2024-01-29 02:20:30 C 00 50 49.438 -02 42 02.92 V 703
2024-01-30 00:55:20 C 00 53 01.325 -02 26 14.60 V W68
2024-01-30 01:01:52 C 00 53 01.951 -02 26 10.03 V W68
2024-01-30 01:09:39 C 00 53 02.702 -02 26 04.60 V W68
2024-01-30 01:25:39 C 00 53 04.258 -02 25 53.44 V W68
2024-01-31 05:18:37 C 00 55 46.560 -02 06 39.13 V T05
2024-01-31 05:23:10 C 00 55 46.999 -02 06 36.22 V T05
2024-01-31 05:31:06 C 00 55 47.748 -02 06 30.64 V T05
2024-01-31 05:57:50 C 00 55 50.314 -02 06 12.24 V T05
2024-02-02 05:18:09 C 01 00 24.175 -01 33 42.98 V T08
2024-02-02 05:22:48 C 01 00 24.619 -01 33 39.89 V T08
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)