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
2023-04-16 21:37:12 C 12 54 15.269 +13 22 14.95 Z G05
2023-04-16 22:09:02 C 12 54 13.416 +13 22 31.58 Z G05
2023-04-16 22:17:22 V 12 54 12.96 +13 22 34.6 V 270
2023-04-16 22:17:22 v 1 359.62620 +49.20365 270
2023-04-16 23:13:49 V 12 54 09.70 +13 23 03.7 V 270
2023-04-16 23:13:49 v 1 359.62620 +49.20365 270
2023-04-17 00:01:16 V 12 54 06.84 +13 23 28.1 V 270
2023-04-17 00:01:16 v 1 359.62620 +49.20365 270
2023-04-17 00:48:43 V 12 54 04.10 +13 23 52.3 V 270
2023-04-17 00:48:43 v 1 359.62620 +49.20365 270
2023-04-17 10:13:55 C 12 53 32.774 +13 28 46.96 V T05
2023-04-17 10:18:29 C 12 53 32.510 +13 28 49.26 V T05
2023-04-17 10:28:15 C 12 53 31.937 +13 28 54.26 V T05
2023-04-17 10:43:55 C 12 53 31.022 +13 29 02.18 V T05
2023-04-17 13:04:10 V 12 53 23.67 +13 30 10.2 V 270
2023-04-17 13:04:10 v 1 134.35900 +35.08986 270
2023-04-17 13:16:40 V 12 53 22.93 +13 30 16.8 V 270
2023-04-17 13:16:40 v 1 134.35900 +35.08986 270
2023-04-17 13:29:11 V 12 53 22.22 +13 30 23.1 V 270
2023-04-17 13:29:11 v 1 134.35900 +35.08986 270
2023-04-17 13:41:53 V 12 53 21.47 +13 30 29.6 V 270
2023-04-17 13:41:53 v 1 134.35900 +35.08986 270
2023-04-18 21:45:41 C 12 51 34.906 +13 46 36.16 V M22
2023-04-18 21:59:39 C 12 51 34.075 +13 46 42.53 V M22
2023-04-18 22:18:06 C 12 51 33.002 +13 46 51.28 V M22
2023-04-19 07:22:36 C 12 51 02.956 +13 51 00.97 V 703
2023-04-19 07:30:56 C 12 51 02.480 +13 51 04.86 V 703
2023-04-19 07:39:15 C 12 51 01.991 +13 51 08.89 V 703
2023-04-19 07:47:35 C 12 51 01.516 +13 51 12.82 V 703
2023-04-20 11:19:33 V 12 49 31.71 +14 04 04.2 V 270
2023-04-20 11:19:33 v 1 134.17923 +34.51207 270
2023-04-20 11:25:54 V 12 49 31.36 +14 04 06.9 V 270
2023-04-20 11:25:54 v 1 134.17923 +34.51207 270
2023-04-20 11:33:15 V 12 49 30.94 +14 04 10.5 V 270
2023-04-20 11:33:15 v 1 134.17923 +34.51207 270
2023-04-20 11:46:21 V 12 49 30.21 +14 04 16.1 V 270
2023-04-20 11:46:21 v 1 134.17923 +34.51207 270
2023-04-20 13:08:25 C 12 49 25.69 +14 04 53.6 V D29
2023-04-20 13:28:47 C 12 49 24.52 +14 05 03.0 V D29
2023-04-20 13:49:08 C 12 49 23.35 +14 05 12.4 V D29
2023-04-20 19:42:18 C 12 49 04.332 +14 07 50.13 V L92
2023-04-20 19:52:10 C 12 49 03.744 +14 07 54.91 V L92
2023-04-20 20:02:33 C 12 49 03.221 +14 08 00.07 V L92
2023-04-20 20:13:00 C 12 49 02.582 +14 08 04.27 V L92
2023-04-20 20:52:06 V 12 49 00.37 +14 08 21.0 V 270
2023-04-20 20:52:06 v 1 006.94402 +48.09096 270
2023-04-20 21:01:24 C 12 48 59.79 +14 08 24.3 V M53
2023-04-20 21:17:55 V 12 48 58.90 +14 08 33.2 V 270
2023-04-20 21:17:55 v 1 006.94402 +48.09096 270
2023-04-20 21:28:50 C 12 48 58.25 +14 08 36.7 V M53
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)