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
2023-05-06 22:00:23 C 12 31 09.282 +15 58 52.40 V L92
2023-05-06 22:13:37 C 12 31 08.719 +15 59 07.08 V M22
2023-05-06 22:19:45 C 12 31 08.543 +15 58 54.44 V L92
2023-05-06 22:40:10 C 12 31 07.779 +15 58 56.41 V L92
2023-05-07 12:30:13 C 12 30 39.46 +16 00 30.2 V D29
2023-05-07 12:50:35 C 12 30 38.69 +16 00 32.3 V D29
2023-05-07 13:10:57 C 12 30 37.94 +16 00 34.6 V D29
2023-05-08 02:13:15 V 12 30 11.56 +16 01 49.7 V 270
2023-05-08 02:13:15 v 1 286.16572 +45.65677 270
2023-05-08 02:25:57 V 12 30 11.13 +16 01 51.0 V 270
2023-05-08 02:25:57 v 1 286.16572 +45.65677 270
2023-05-08 02:38:28 V 12 30 10.64 +16 01 52.3 V 270
2023-05-08 02:38:28 v 1 286.16572 +45.65677 270
2023-05-08 02:47:51 C 12 30 10.195 +16 02 06.65 V W68
2023-05-08 02:51:10 V 12 30 10.18 +16 01 53.5 V 270
2023-05-08 02:51:10 v 1 286.16572 +45.65677 270
2023-05-08 02:53:08 C 12 30 09.998 +16 02 07.12 V W68
2023-05-08 02:55:06 C 12 30 09.929 +16 02 07.48 V W68
2023-05-08 02:59:42 C 12 30 09.756 +16 02 07.66 V W68
2023-05-08 03:02:19 C 12 30 09.660 +16 02 07.91 V W68
2023-05-08 03:07:34 C 12 30 09.468 +16 02 08.34 V W68
2023-05-08 03:16:22 C 12 30 09.151 +16 02 09.17 V W68
2023-05-08 03:22:15 C 12 30 08.933 +16 02 09.60 V W68
2023-05-08 06:28:07 C 12 30 02.704 +16 02 14.50 V 703
2023-05-08 06:35:51 C 12 30 02.430 +16 02 15.11 V 703
2023-05-08 06:43:34 C 12 30 02.153 +16 02 15.65 V 703
2023-05-08 06:51:19 C 12 30 01.876 +16 02 16.33 V 703
2023-05-08 17:04:50 C 12 29 41.66 +16 03 07.2 V D29
2023-05-08 17:19:52 C 12 29 41.15 +16 03 08.1 V D29
2023-05-08 17:34:54 C 12 29 40.64 +16 03 09.2 V D29
2023-05-08 20:44:26 V 12 29 35.29 +16 03 24.4 V 270
2023-05-08 20:44:26 v 1 002.83916 +44.07174 270
2023-05-08 20:56:56 V 12 29 34.87 +16 03 25.3 V 270
2023-05-08 20:56:56 v 1 002.83916 +44.07174 270
2023-05-08 21:09:27 V 12 29 34.42 +16 03 26.4 V 270
2023-05-08 21:09:27 v 1 002.83916 +44.07174 270
2023-05-08 21:22:09 V 12 29 33.95 +16 03 26.7 V 270
2023-05-08 21:22:09 v 1 002.83916 +44.07174 270
2023-05-09 01:35:42 V 12 29 26.14 +16 03 48.2 V 270
2023-05-09 01:35:42 v 1 279.89627 +26.50962 270
2023-05-09 01:48:24 V 12 29 25.71 +16 03 49.1 V 270
2023-05-09 01:48:24 v 1 279.89627 +26.50962 270
2023-05-09 02:01:07 V 12 29 25.26 +16 03 50.2 V 270
2023-05-09 02:01:07 v 1 279.89627 +26.50962 270
2023-05-09 02:13:37 V 12 29 24.83 +16 03 51.1 V 270
2023-05-09 02:13:37 v 1 279.89627 +26.50962 270
2023-05-09 14:13:14 V 12 29 01.88 +16 04 37.4 V 270
2023-05-09 14:13:14 v 1 135.50844 +34.81766 270
2023-05-09 14:25:32 V 12 29 01.47 +16 04 38.1 V 270
2023-05-09 14:25:32 v 1 135.50844 +34.81766 270
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)