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
2020-02-06 09:51:28 C 09 14 10.56 +16 48 11.1 V T08
2020-02-11 13:26:34 C 09 07 36.23 +17 32 01.6 q E89
2020-02-11 13:32:27 C 09 07 35.90 +17 32 03.8 q E89
2020-02-11 13:37:37 C 09 07 35.62 +17 32 05.5 q E89
2020-02-11 13:42:47 C 09 07 35.35 +17 32 07.3 q E89
2020-02-11 13:47:59 C 09 07 35.07 +17 32 08.8 q E89
2020-02-13 01:57:16 C 09 05 40.60 +17 44 32.7 o Z22
2020-02-13 02:03:16 C 09 05 40.21 +17 44 35.3 o Z22
2020-02-13 06:20:32 C 09 05 26.87 +17 46 02.9 U I41
2020-02-13 06:22:28 C 09 05 26.77 +17 46 03.5 U I41
2020-02-13 06:23:45 C 09 05 26.70 +17 46 04.0 U I41
2020-02-13 09:36:44 C 09 05 16.59 +17 47 17.1 q E89
2020-02-13 09:39:55 C 09 05 16.42 +17 47 17.3 q E89
2020-02-13 09:43:17 C 09 05 16.23 +17 47 18.8 q E89
2020-02-14 07:10:07 C 09 04 08.58 +17 54 31.0 V G96
2020-02-14 07:18:08 C 09 04 08.15 +17 54 33.7 V G96
2020-02-14 07:26:09 C 09 04 07.72 +17 54 36.4 V G96
2020-02-14 07:34:08 C 09 04 07.29 +17 54 39.1 V G96
2020-02-14 19:50:45 C 09 03 29.07 +17 58 47.1 V 108
2020-02-14 19:55:04 C 09 03 28.83 +17 58 48.4 V 108
2020-02-14 19:59:21 C 09 03 28.62 +17 58 50.1 V 108
2020-02-14 23:41:08 C 09 03 16.80 +18 00 04.7 V A16
2020-02-14 23:59:28 C 09 03 15.82 +18 00 10.8 V A16
2020-02-15 00:18:02 C 09 03 14.83 +18 00 17.1 V A16
2020-02-15 00:36:39 C 09 03 13.85 +18 00 23.3 V A16
2020-02-15 06:07:39 C 09 02 56.82 +18 02 15.8 U I41
2020-02-15 06:59:25 C 09 02 54.03 +18 02 33.1 V 703
2020-02-15 07:07:01 C 09 02 53.63 +18 02 35.6 V 703
2020-02-15 07:07:41 C 09 02 53.61 +18 02 36.0 U I41
2020-02-15 07:22:15 C 09 02 52.65 +18 02 43.1 V 703
2020-02-17 06:54:05 C 09 00 25.83 +18 18 25.7 U I41
2020-02-17 06:56:02 C 09 00 25.73 +18 18 26.4 U I41
2020-02-17 06:57:21 C 09 00 25.66 +18 18 26.8 U I41
2020-02-18 06:24:54 C 08 59 14.10 +18 26 03.9 V 703
2020-02-18 06:32:31 C 08 59 13.71 +18 26 06.4 V 703
2020-02-18 06:40:08 C 08 59 13.32 +18 26 08.7 V 703
2020-02-18 06:47:45 C 08 59 12.92 +18 26 11.3 V 703
2020-02-19 05:54:05 C 08 58 03.29 +18 33 34.9 U I41
2020-02-19 05:56:42 C 08 58 03.16 +18 33 35.6 U I41
2020-02-19 06:06:44 C 08 58 02.64 +18 33 38.9 U I41
2020-02-19 06:08:45 C 08 58 02.54 +18 33 39.6 U I41
2020-02-19 07:06:38 C 08 57 59.56 +18 33 58.0 U I41
2020-02-20 05:07:26 C 08 56 54.11 +18 40 54.0 U I41
2020-02-20 05:08:44 C 08 56 54.04 +18 40 54.5 U I41
2020-02-20 05:52:28 C 08 56 51.82 +18 41 08.2 U I41
2020-02-20 05:54:28 C 08 56 51.72 +18 41 08.9 U I41
2020-02-20 06:29:58 C 08 56 49.92 +18 41 20.0 U I41
2020-02-20 07:21:11 C 08 56 47.32 +18 41 36.0 U I41
2020-02-21 04:33:12 C 08 55 45.20 +18 48 10.0 U I41
2020-02-21 04:56:14 C 08 55 44.06 +18 48 17.1 U I41
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)