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
2020-03-05 03:01:04 C 08 42 30.53 +20 11 19.4 u H21
2020-03-05 03:03:07 C 08 42 30.47 +20 11 19.7 u H21
2020-03-07 20:52:14 C 08 40 17.20 +20 25 30.9 a 233
2020-03-07 20:58:41 C 08 40 16.98 +20 25 32.2 a 233
2020-03-07 21:04:24 C 08 40 16.79 +20 25 33.5 a 233
2020-03-07 21:10:08 C 08 40 16.60 +20 25 34.4 a 233
2020-03-07 21:15:51 C 08 40 16.42 +20 25 35.7 a 233
2020-03-09 09:44:21 C 08 39 08.54 +20 32 57.5 V T08
2020-03-09 09:49:33 C 08 39 08.37 +20 32 58.4 V T08
2020-03-09 10:09:58 C 08 39 07.74 +20 33 02.3 V T08
2020-03-10 00:00:12 C 08 38 43.29 +20 35 42.0 o Z22
2020-03-10 00:02:07 C 08 38 43.26 +20 35 41.9 o Z22
2020-03-10 00:47:37 C 08 38 41.92 +20 35 49.4 o Z22
2020-03-11 07:48:58 C 08 37 49.46 +20 41 39.6 V T05
2020-03-11 08:02:41 C 08 37 49.07 +20 41 42.1 V T05
2020-03-11 08:27:04 C 08 37 48.37 +20 41 46.5 V T05
2020-03-11 08:34:00 C 08 37 48.17 +20 41 47.9 V T05
2020-03-11 12:05:23 C 08 37 42.60 +20 42 25.1 q D29
2020-03-11 12:25:44 C 08 37 42.01 +20 42 28.9 q D29
2020-03-11 12:46:06 C 08 37 41.44 +20 42 32.6 q D29
2020-03-11 20:10:54 C 08 37 29.49 +20 43 51.8 a 233
2020-03-11 20:19:01 C 08 37 29.27 +20 43 53.4 a 233
2020-03-11 20:26:25 C 08 37 29.06 +20 43 54.6 a 233
2020-03-11 23:46:22 C 08 37 23.58 +20 44 31.2 o Z22
2020-03-12 01:34:20 C 08 37 20.59 +20 44 50.0 o Z22
2020-03-12 16:44:50 C 08 36 57.30 +20 47 30.4 16.5 q C97
2020-03-12 16:47:02 C 08 36 57.25 +20 47 30.8 16.5 q C97
2020-03-12 16:49:12 C 08 36 57.18 +20 47 31.2 16.6 q C97
2020-03-12 16:51:23 C 08 36 57.14 +20 47 31.5 16.7 q C97
2020-03-14 21:00:05 C 08 35 42.01 +20 56 06.9 V A16
2020-03-14 21:21:33 C 08 35 41.51 +20 56 10.3 V A16
2020-03-14 21:43:00 C 08 35 41.00 +20 56 13.7 V A16
2020-03-15 19:53:55 C 08 35 12.10 +20 59 39.6 V 130
2020-03-15 19:57:22 C 08 35 12.03 +20 59 40.3 V 130
2020-03-15 20:01:11 C 08 35 11.94 +20 59 41.0 V 130
2020-03-15 20:05:01 C 08 35 11.85 +20 59 41.4 V 130
2020-03-16 21:26:10 n 08 34 40.80 +21 03 26.2 V Z43
2020-03-16 21:39:23 n 08 34 40.52 +21 03 28.4 V Z43
2020-03-16 22:36:40 n 08 34 39.34 +21 03 36.4 V Z43
2020-03-17 12:05:17 C 08 34 24.00 +21 05 33.1 q D29
2020-03-17 12:25:39 C 08 34 23.59 +21 05 35.9 q D29
2020-03-17 12:46:01 C 08 34 23.19 +21 05 38.8 q D29
2020-03-18 17:12:14 C 08 33 52.60 +21 09 32.4 16.8 q C97
2020-03-18 17:14:25 C 08 33 52.56 +21 09 32.7 16.8 q C97
2020-03-18 17:16:36 C 08 33 52.52 +21 09 32.9 16.7 q C97
2020-03-18 17:18:48 C 08 33 52.36 +21 09 33.0 16.5 q C97
2020-03-19 19:34:48 C 08 33 26.90 +21 12 54.9 V 108
2020-03-19 19:39:06 C 08 33 26.80 +21 12 54.6 V 108
2020-03-19 19:43:25 C 08 33 26.72 +21 12 55.6 V 108
2020-03-19 19:46:37 C 08 33 26.62 +21 12 56.4 V 108
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)