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
2017-02-10 02:22:29 C 05 53 19.58 +18 06 29.7 u H21
2017-02-10 02:23:58 C 05 53 19.56 +18 06 30.0 u H21
2017-02-10 02:24:26 C 05 53 19.54 +18 06 29.9 u H21
2017-02-11 14:22:48 C 05 52 55.01 +18 12 32.9 q D29
2017-02-11 14:40:34 C 05 52 54.81 +18 12 36.0 q D29
2017-02-11 14:58:20 C 05 52 54.60 +18 12 38.7 q D29
2017-02-13 02:30:36 C 05 52 35.15 +18 18 33.4 u H21
2017-02-13 02:32:34 C 05 52 35.13 +18 18 33.8 u H21
2017-02-13 02:34:31 C 05 52 35.11 +18 18 34.1 u H21
2017-02-13 02:36:29 C 05 52 35.09 +18 18 34.4 u H21
2017-02-13 02:38:27 C 05 52 35.07 +18 18 34.7 u H21
2017-02-13 02:40:24 C 05 52 35.05 +18 18 35.1 u H21
2017-02-13 02:42:44 C 05 52 35.03 +18 18 35.5 u H21
2017-02-13 07:07:54 C 05 52 32.91 +18 19 20.9 L T05
2017-02-13 07:29:31 C 05 52 32.70 +18 19 24.4 L T05
2017-02-13 07:56:21 C 05 52 32.47 +18 19 29.1 L T05
2017-02-13 08:01:25 C 05 52 32.44 +18 19 29.7 L T05
2017-02-15 20:30:27 C 05 52 10.15 +18 29 23.9 q 160
2017-02-15 20:33:01 C 05 52 10.13 +18 29 24.4 q 160
2017-02-15 20:35:32 C 05 52 10.12 +18 29 24.9 q 160
2017-02-17 05:55:25 C 05 52 03.22 +18 34 51.0 L T08
2017-02-17 06:22:16 C 05 52 03.10 +18 34 55.2 L T08
2017-02-17 06:37:24 C 05 52 03.06 +18 34 57.7 L T08
2017-02-17 06:58:52 C 05 52 02.98 +18 35 01.1 L T08
2017-02-17 07:41:52 C 05 52 02.83 +18 35 08.4 L T05
2017-02-17 07:47:50 C 05 52 02.80 +18 35 09.3 L T05
2017-02-17 08:19:33 C 05 52 02.66 +18 35 14.0 L T05
2017-02-17 08:41:21 C 05 52 02.59 +18 35 17.4 L T05
2017-02-17 08:53:25 C 05 52 02.55 +18 35 19.4 L T05
2017-02-21 05:48:35 C 05 52 03.46 +18 50 06.4 L T08
2017-02-21 05:55:50 C 05 52 03.49 +18 50 07.1 L T08
2017-02-21 05:56:34 C 05 52 03.51 +18 50 08.2 L T08
2017-02-21 06:22:44 C 05 52 03.54 +18 50 11.7 L T08
2017-02-21 06:23:27 C 05 52 03.54 +18 50 12.3 L T08
2017-02-21 06:39:11 C 05 52 03.56 +18 50 15.3 L T08
2017-02-21 06:41:04 C 05 52 03.57 +18 50 14.9 L T08
2017-02-21 07:00:01 C 05 52 03.59 +18 50 17.7 L T08
2017-02-21 07:37:11 C 05 52 03.64 +18 50 23.5 L T05
2017-02-21 07:58:47 C 05 52 03.68 +18 50 26.6 L T05
2017-02-21 08:26:05 C 05 52 03.73 +18 50 31.0 L T05
2017-02-21 08:36:22 C 05 52 03.74 +18 50 32.4 L T05
2017-02-21 08:55:28 C 05 52 03.78 +18 50 35.4 L T05
2017-03-10 20:10:04 C 05 57 35.25 +19 51 11.0 q 160
2017-03-10 20:12:04 C 05 57 35.30 +19 51 10.9 q 160
2017-03-10 20:13:56 C 05 57 35.31 +19 51 11.1 q 160
2017-03-11 02:33:03 C 05 57 43.97 +19 52 01.1 q H45
2017-03-11 02:35:04 C 05 57 44.01 +19 52 01.5 q H45
2017-03-11 02:37:05 C 05 57 44.07 +19 52 01.8 q H45
2017-03-13 01:55:05 C 05 58 51.88 +19 58 07.7 q H45
2017-03-13 01:56:40 C 05 58 51.92 +19 58 07.9 q H45
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)