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
2010-04-13 02:33:14 C 09 37 18.22 +20 38 18.8 r H53
2010-04-13 02:38:17 C 09 37 18.22 +20 38 19.0 r H53
2010-04-13 02:44:42 C 09 37 18.14 +20 38 19.1 r H53
2010-04-13 20:50:10 C 09 37 14.09 +20 38 47.7 16.2 u 084
2010-04-14 20:10:09 C 09 37 10.74 +20 39 18.0 16.1 u 084
2010-04-14 20:13:18 C 09 37 10.73 +20 39 18.1 16.1 u 084
2010-04-14 21:29:57 C 09 37 10.61 +20 39 20.1 o A32
2010-04-14 21:44:12 C 09 37 10.57 +20 39 20.1 o A32
2010-04-16 18:36:06 C 09 37 10.01 +20 39 45.2 16.3 u C20
2010-04-16 18:38:13 C 09 37 10.01 +20 39 45.2 16.2 u C20
2010-04-17 19:51:20 C 09 37 12.89 +20 39 39.7 16.2 o 084
2010-04-17 19:54:29 C 09 37 12.88 +20 39 39.5 16.2 o 084
2010-04-17 22:22:35 C 09 37 13.15 +20 39 38.6 16.1 u C20
2010-04-17 22:24:42 C 09 37 13.15 +20 39 38.5 16.2 u C20
2010-04-17 22:48:12 C 09 37 13.39 +20 39 38.2 v J93
2010-04-17 22:52:22 C 09 37 13.40 +20 39 38.3 v J93
2010-04-17 22:56:34 C 09 37 13.41 +20 39 38.6 v J93
2010-04-18 19:34:30 C 09 37 17.76 +20 39 23.6 16.2 u 084
2010-04-18 19:37:39 C 09 37 17.76 +20 39 23.5 16.4 u 084
2010-04-18 20:13:00 C 09 37 17.94 +20 39 23.9 u 510
2010-04-18 20:18:04 C 09 37 17.96 +20 39 23.8 u 510
2010-04-18 20:23:07 C 09 37 17.97 +20 39 23.7 u 510
2010-04-19 19:49:19 C 09 37 24.63 +20 38 57.1 16.1 u C20
2010-04-19 19:51:25 C 09 37 24.63 +20 38 57.0 16.1 u C20
2010-04-20 19:44:54 C 09 37 33.55 +20 38 18.5 16.1 u C20
2010-04-20 19:47:01 C 09 37 33.56 +20 38 18.4 16.1 u C20
2010-04-21 20:13:40 C 09 37 44.79 +20 37 26.8 16.3 o 084
2010-04-21 20:16:49 C 09 37 44.84 +20 37 26.7 16.3 o 084
2010-04-24 20:07:20 C 09 38 29.47 +20 33 54.0 16.1 u 084
2010-04-24 20:10:29 C 09 38 29.52 +20 33 53.4 16.1 u 084
2010-04-25 20:15:31 C 09 38 48.31 +20 32 21.2 16.2 u 084
2010-04-25 20:18:42 C 09 38 48.35 +20 32 21.0 16.1 u 084
2010-04-26 20:09:43 C 09 39 08.85 +20 30 39.6 16.2 o 084
2010-04-26 20:12:53 C 09 39 08.84 +20 30 39.5 16.3 o 084
2010-04-28 20:17:40 C 09 39 55.67 +20 26 45.6 16.5 u C20
2010-04-28 20:19:46 C 09 39 55.71 +20 26 45.3 16.4 u C20
2010-04-28 20:56:04 C 09 39 56.42 +20 26 41.1 u 084
2010-04-28 20:59:13 C 09 39 56.46 +20 26 40.6 u 084
2010-04-29 20:41:42 C 09 40 22.21 +20 24 31.2 16.6 u C20
2010-04-29 20:43:49 C 09 40 22.24 +20 24 31.0 16.6 u C20
2010-04-30 20:17:55 C 09 40 49.64 +20 22 12.2 16.3 u C20
2010-04-30 20:20:02 C 09 40 49.68 +20 22 12.0 16.3 u C20
2010-05-01 20:55:49 C 09 41 20.12 +20 19 36.5 16.2 u 084
2010-05-02 20:51:12 C 09 41 51.43 +20 16 56.2 16.3 u 084
2010-05-02 20:54:22 C 09 41 51.51 +20 16 55.8 16.3 u 084
2010-05-03 19:50:56 C 09 42 23.13 +20 14 13.8 15.8 u 084
2010-05-03 19:54:06 C 09 42 23.20 +20 14 13.3 16.0 u 084
2010-05-04 05:17:27 C 09 42 36.50 +20 13 06.4 r 703
2010-05-04 05:24:56 C 09 42 36.64 +20 13 05.4 r 703
2010-05-04 05:32:26 C 09 42 36.82 +20 13 04.6 r 703
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)