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
2005-04-02 06:55:33 C 10 25 24.09 +18 51 29.8 o 699
2005-04-02 06:58:11 C 10 25 23.96 +18 51 30.5 r 703
2005-04-02 07:09:46 C 10 25 23.53 +18 51 33.1 r 703
2005-04-02 19:13:34 C 10 24 58.86 +18 54 13.2 c 113
2005-04-02 19:15:43 C 10 24 58.79 +18 54 13.7 c 113
2005-04-02 19:17:54 C 10 24 58.71 +18 54 14.0 c 113
2005-04-02 19:20:02 C 10 24 58.64 +18 54 14.4 c 113
2005-04-02 20:08:15 C 10 24 56.94 +18 54 25.1 c 127
2005-04-02 20:15:23 C 10 24 56.68 +18 54 26.7 c 127
2005-04-02 20:22:29 C 10 24 56.43 +18 54 28.2 c 127
2005-04-02 20:29:28 C 10 24 56.20 +18 54 29.8 c 127
2005-04-03 18:53:43 C 10 24 11.25 +18 59 16.7 r 240
2005-04-03 18:55:38 C 10 24 11.18 +18 59 17.1 r 240
2005-04-03 18:58:31 C 10 24 11.08 +18 59 17.5 r 240
2005-04-03 19:01:24 C 10 24 10.98 +18 59 18.1 r 240
2005-04-03 20:21:14 C 10 24 08.28 +18 59 35.6 c A41
2005-04-03 20:37:37 C 10 24 07.60 +18 59 37.5 o 084
2005-04-03 20:41:15 C 10 24 07.48 +18 59 37.9 o 084
2005-04-03 21:05:55 C 10 24 06.74 +18 59 44.8 c A41
2005-04-03 21:51:08 C 10 24 05.20 +18 59 54.0 c A41
2005-04-03 23:07:29 C 10 24 02.62 +19 00 08.6 o A32
2005-04-03 23:12:20 C 10 24 02.46 +19 00 09.6 o A32
2005-04-03 23:17:11 C 10 24 02.30 +19 00 10.6 o A32
2005-04-04 12:33:15 C 10 23 36.82 +19 02 53.5 r 379
2005-04-04 12:34:48 C 10 23 36.79 +19 02 54.0 r 379
2005-04-04 12:36:19 C 10 23 36.71 +19 02 54.5 r 379
2005-04-04 12:42:27 C 10 23 36.51 +19 02 55.1 r 379
2005-04-04 22:38:18 C 10 23 17.62 +19 04 49.4 o 084
2005-04-04 22:41:56 C 10 23 17.50 +19 04 50.1 o 084
2005-04-05 20:17:04 C 10 22 38.21 +19 08 55.2 r A30
2005-04-05 20:20:09 C 10 22 38.12 +19 08 55.8 r A30
2005-04-05 20:24:34 C 10 22 37.98 +19 08 56.6 r A30
2005-04-05 20:39:20 C 10 22 37.52 +19 08 59.2 r A30
2005-04-05 20:45:08 C 10 22 37.34 +19 09 00.4 r A30
2005-04-06 02:51:30 C 10 22 26.64 +19 10 08.3 o H06
2005-04-06 03:16:13 C 10 22 25.88 +19 10 12.7 o H06
2005-04-06 03:33:14 C 10 22 25.35 +19 10 15.9 o H06
2005-04-06 03:51:34 C 10 22 24.78 +19 10 19.1 o H06
2005-04-06 04:05:25 C 10 22 24.35 +19 10 21.6 o H06
2005-04-06 21:29:00 C 10 21 54.09 +19 13 20.1 o 084
2005-04-06 21:32:38 C 10 21 53.99 +19 13 20.8 o 084
2005-04-09 05:14:47 C 10 20 25.58 +19 22 03.7 r 703
2005-04-09 05:26:25 C 10 20 25.29 +19 22 05.4 r 703
2005-04-09 05:38:02 C 10 20 24.97 +19 22 07.0 r 703
2005-04-09 05:49:48 C 10 20 24.68 +19 22 08.5 r 703
2005-04-09 06:05:00 C 10 20 24.25 +19 22 10.7 r 703
2005-04-09 06:16:43 C 10 20 23.96 +19 22 12.2 r 703
2005-04-09 06:28:24 C 10 20 23.67 +19 22 13.8 r 703
2005-04-09 06:40:07 C 10 20 23.35 +19 22 15.5 r 703
2005-04-09 08:46:16 C 10 20 20.31 +19 22 34.2 16.2 c 608
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)