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
2008-11-06 23:54:27 C 03 31 54.64 -00 19 10.6 13.7 r 084
2008-11-06 23:56:40 C 03 31 54.50 -00 19 10.9 13.7 r 084
2008-11-07 00:09:45 C 03 31 53.63 -00 19 12.3 13.7 r 084
2008-11-07 22:12:17 C 03 30 28.29 -00 21 20.9 14.2 r 084
2008-11-07 22:14:29 C 03 30 28.12 -00 21 21.0 14.0 o 084
2008-11-09 21:48:55 C 03 27 25.19 -00 24 58.5 c B20
2008-11-09 21:52:12 C 03 27 25.00 -00 24 58.7 c B20
2008-11-09 22:03:46 C 03 27 24.24 -00 25 00.2 c B20
2008-11-18 23:12:36 C 03 14 16.46 -00 25 03.9 t B75
2008-11-18 23:15:46 C 03 14 16.29 -00 25 03.6 t B75
2008-11-18 23:17:23 C 03 14 16.19 -00 25 03.6 t B75
2008-11-18 23:19:56 C 03 14 16.06 -00 25 03.2 t B75
2008-11-18 23:23:33 C 03 14 15.82 -00 25 03.2 t B75
2008-11-19 05:23:25 C 03 13 55.95 -00 24 38.7 r 703
2008-11-19 05:36:35 C 03 13 55.20 -00 24 37.9 r 703
2008-11-19 05:49:32 C 03 13 54.44 -00 24 37.0 r 703
2008-11-19 06:02:14 C 03 13 53.68 -00 24 36.1 r 703
2008-11-19 22:32:42 C 03 12 58.84 -00 23 29.2 t B75
2008-11-19 22:35:10 C 03 12 58.69 -00 23 29.0 t B75
2008-11-19 22:38:47 C 03 12 58.48 -00 23 28.8 t B75
2008-11-21 21:05:16 C 03 10 28.92 -00 19 29.3 14.5 r 084
2008-11-21 21:07:28 C 03 10 28.77 -00 19 28.7 14.3 r 084
2008-11-22 03:53:28 C 03 10 07.77 -00 18 45.2 r H53
2008-11-22 03:59:09 C 03 10 07.45 -00 18 44.8 r H53
2008-11-22 04:05:08 C 03 10 07.13 -00 18 44.1 r H53
2008-11-22 04:10:09 C 03 10 06.87 -00 18 43.7 r H53
2008-11-22 04:15:10 C 03 10 06.57 -00 18 43.0 r H53
2008-11-22 04:20:09 C 03 10 06.32 -00 18 42.8 r H53
2008-11-25 19:36:13 C 03 05 47.79 -00 07 49.3 o J93
2008-11-25 19:42:18 C 03 05 47.48 -00 07 48.4 o J93
2008-11-25 19:48:24 C 03 05 47.17 -00 07 47.4 o J93
2008-11-26 03:41:07 C 03 05 25.04 -00 06 35.1 r H53
2008-11-26 03:45:08 C 03 05 24.86 -00 06 34.3 r H53
2008-11-26 03:49:09 C 03 05 24.67 -00 06 33.6 r H53
2008-11-26 03:53:09 C 03 05 24.48 -00 06 33.4 r H53
2008-11-26 03:57:09 C 03 05 24.28 -00 06 32.5 r H53
2008-11-26 04:00:09 C 03 05 24.14 -00 06 32.0 r H53
2008-11-26 22:50:17 C 03 04 32.42 -00 03 37.2 r B75
2008-11-26 22:52:45 C 03 04 32.32 -00 03 36.9 r B75
2008-11-26 23:04:05 C 03 04 31.78 -00 03 35.1 r B75
2008-11-27 02:16:09 C 03 04 23.57 -00 03 03.1 r H53
2008-11-27 02:21:08 C 03 04 23.32 -00 03 02.2 r H53
2008-11-27 02:26:08 C 03 04 23.07 -00 03 01.7 r H53
2008-11-27 02:31:10 C 03 04 22.86 -00 03 00.6 r H53
2008-11-27 02:36:09 C 03 04 22.60 -00 02 59.9 r H53
2008-11-27 02:41:19 C 03 04 22.36 -00 02 58.9 r H53
2008-12-01 06:03:53 C 03 00 15.40 +00 15 22.2 r 703
2008-12-01 06:15:10 C 03 00 14.97 +00 15 24.4 r 703
2008-12-01 06:26:28 C 03 00 14.50 +00 15 26.8 r 703
2008-12-01 06:37:48 C 03 00 14.04 +00 15 29.2 r 703
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)