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
2017-01-20 22:22:06 C 06 06 15.25 +16 41 31.5 q 160
2017-01-20 22:24:04 C 06 06 15.17 +16 41 31.9 q 160
2017-01-20 22:26:01 C 06 06 15.08 +16 41 32.5 q 160
2017-01-24 09:17:28 C 06 03 04.32 +16 56 27.2 L T05
2017-01-24 09:22:24 C 06 03 04.14 +16 56 28.1 L T05
2017-01-24 09:46:37 C 06 03 03.22 +16 56 32.5 L T05
2017-01-24 10:17:24 C 06 03 02.07 +16 56 37.8 L T05
2017-01-24 10:29:28 C 06 03 01.62 +16 56 39.8 L T05
2017-01-24 13:24:25 C 06 02 55.46 +16 57 10.2 q Q11
2017-01-24 13:28:31 C 06 02 55.32 +16 57 11.1 q Q11
2017-01-24 13:32:34 C 06 02 55.17 +16 57 11.8 q Q11
2017-01-24 20:11:26 C 06 02 41.05 +16 58 22.4 o 107
2017-01-24 20:19:26 C 06 02 40.76 +16 58 23.9 o 107
2017-01-24 20:26:21 C 06 02 40.44 +16 58 25.0 o 107
2017-01-25 22:54:04 C 06 01 45.23 +17 03 08.7 q 160
2017-01-25 22:56:02 C 06 01 45.16 +17 03 09.1 q 160
2017-01-25 22:58:01 C 06 01 45.12 +17 03 09.5 q 160
2017-01-26 13:34:33 C 06 01 15.72 +17 05 46.9 q Q11
2017-01-26 13:38:38 C 06 01 15.59 +17 05 47.7 q Q11
2017-01-26 13:42:42 C 06 01 15.45 +17 05 48.4 q Q11
2017-01-27 09:20:07 C 06 00 37.110 +17 09 19.35 L F51
2017-01-27 09:40:16 C 06 00 36.437 +17 09 22.87 L F51
2017-01-27 10:00:24 C 06 00 35.770 +17 09 26.41 L F51
2017-01-27 10:20:40 C 06 00 35.097 +17 09 29.93 L F51
2017-01-28 08:49:12 C 05 59 53.05 +17 13 30.0 L T05
2017-01-28 09:17:05 C 05 59 52.17 +17 13 35.0 L T05
2017-01-28 09:47:50 C 05 59 51.18 +17 13 40.2 L T05
2017-01-28 09:58:11 C 05 59 50.86 +17 13 42.0 L T05
2017-01-28 10:19:08 C 05 59 50.19 +17 13 45.7 L T05
2017-02-05 07:22:31 C 05 55 08.30 +17 46 53.9 L T05
2017-02-05 07:47:24 C 05 55 07.78 +17 46 58.3 L T05
2017-02-05 07:56:19 C 05 55 07.64 +17 46 59.7 L T05
2017-02-05 08:18:19 C 05 55 07.17 +17 47 03.0 L T05
2017-02-05 08:29:48 C 05 55 06.90 +17 47 05.1 L T05
2017-02-09 08:04:56 C 05 53 33.66 +18 03 25.4 L T05
2017-02-09 08:33:29 C 05 53 33.24 +18 03 30.2 L T05
2017-02-09 08:40:43 C 05 53 33.10 +18 03 31.6 L T05
2017-02-09 09:04:03 C 05 53 32.78 +18 03 35.9 L T05
2017-02-09 09:21:27 C 05 53 32.53 +18 03 38.5 L T05
2017-02-10 02:00:55 C 05 53 19.86 +18 06 26.3 u H21
2017-02-10 02:02:53 C 05 53 19.83 +18 06 26.6 u H21
2017-02-10 02:04:50 C 05 53 19.81 +18 06 27.0 u H21
2017-02-10 02:06:48 C 05 53 19.78 +18 06 27.2 u H21
2017-02-10 02:08:46 C 05 53 19.76 +18 06 27.6 u H21
2017-02-10 02:10:43 C 05 53 19.73 +18 06 27.6 u H21
2017-02-10 02:12:41 C 05 53 19.71 +18 06 28.2 u H21
2017-02-10 02:14:38 C 05 53 19.67 +18 06 28.4 u H21
2017-02-10 02:16:36 C 05 53 19.66 +18 06 28.6 u H21
2017-02-10 02:18:34 C 05 53 19.63 +18 06 29.0 u H21
2017-02-10 02:20:31 C 05 53 19.60 +18 06 29.3 u H21
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)