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
2015-01-20 10:26:59 C 10 12 26.80 +12 32 42.2 o 691
2015-01-20 10:47:21 C 10 12 26.11 +12 32 48.1 R G45
2015-01-20 10:53:13 C 10 12 25.93 +12 32 49.6 R G45
2015-01-20 10:56:12 C 10 12 25.81 +12 32 51.6 o 691
2015-01-20 10:59:14 C 10 12 25.71 +12 32 51.8 R G45
2015-01-20 11:15:55 C 10 12 25.11 +12 32 57.6 R G45
2015-01-20 11:23:49 C 10 12 24.85 +12 32 59.4 R G45
2015-01-20 11:25:23 C 10 12 24.82 +12 33 00.4 o 691
2015-01-20 11:29:48 C 10 12 24.66 +12 33 01.1 R G45
2015-01-20 11:35:39 C 10 12 24.46 +12 33 03.4 R G45
2015-01-22 10:39:04 C 10 10 48.874 +12 48 21.87 L F51
2015-01-22 10:58:39 C 10 10 48.157 +12 48 28.42 L F51
2015-01-22 11:18:15 C 10 10 47.412 +12 48 35.07 L F51
2015-01-22 11:37:58 C 10 10 46.718 +12 48 41.52 L F51
2015-01-24 08:44:23 C 10 09 08.38 +13 03 55.8 o 691
2015-01-24 09:38:13 C 10 09 06.29 +13 04 14.3 o 691
2015-01-24 10:07:26 C 10 09 05.15 +13 04 24.5 o 691
2015-01-24 10:25:23 C 10 09 04.47 +13 04 30.2 R G45
2015-01-24 10:31:22 C 10 09 04.23 +13 04 32.4 R G45
2015-01-24 10:44:54 C 10 09 03.72 +13 04 37.1 R G45
2015-01-24 10:50:51 C 10 09 03.47 +13 04 39.1 R G45
2015-01-24 11:04:56 C 10 09 02.93 +13 04 43.8 R G45
2015-01-24 11:10:48 C 10 09 02.75 +13 04 45.8 R G45
2015-01-25 10:23:04 C 10 08 09.73 +13 12 50.0 R G45
2015-01-25 10:28:56 C 10 08 09.50 +13 12 52.6 R G45
2015-01-25 10:36:21 C 10 08 09.18 +13 12 54.9 R G45
2015-01-25 10:48:23 C 10 08 08.72 +13 12 59.1 R G45
2015-01-25 10:56:47 C 10 08 08.38 +13 13 01.5 R G45
2015-01-25 11:02:39 C 10 08 08.17 +13 13 04.2 R G45
2015-01-25 11:08:40 C 10 08 07.92 +13 13 06.2 R G45
2015-01-26 10:20:33 C 10 07 13.39 +13 21 19.1 R G45
2015-01-26 10:26:25 C 10 07 13.14 +13 21 21.0 R G45
2015-01-26 10:33:50 C 10 07 12.82 +13 21 23.6 R G45
2015-01-26 10:39:54 C 10 07 12.58 +13 21 25.5 R G45
2015-01-26 10:45:52 C 10 07 12.33 +13 21 27.7 R G45
2015-01-26 10:48:01 C 10 07 12.24 +13 21 28.5 R G45
2015-01-26 10:53:59 C 10 07 12.03 +13 21 30.9 R G45
2015-01-26 10:59:54 C 10 07 11.78 +13 21 32.9 R G45
2015-01-27 02:15:57 C 10 06 35.13 +13 27 00.5 q 160
2015-01-27 02:18:14 C 10 06 35.02 +13 27 01.2 q 160
2015-01-27 02:20:30 C 10 06 34.94 +13 27 02.1 q 160
2015-01-28 10:04:02 C 10 05 16.62 +13 38 36.3 R G45
2015-01-28 10:10:00 C 10 05 16.36 +13 38 37.9 R G45
2015-01-28 10:23:18 C 10 05 15.77 +13 38 43.0 R G45
2015-01-28 10:29:21 C 10 05 15.52 +13 38 45.5 R G45
2015-01-28 10:35:19 C 10 05 15.26 +13 38 47.4 R G45
2015-01-28 10:37:28 C 10 05 15.16 +13 38 48.2 R G45
2015-01-28 10:43:26 C 10 05 14.90 +13 38 50.6 R G45
2015-01-28 10:49:18 C 10 05 14.67 +13 38 53.0 R G45
2015-01-30 19:21:57 C 10 02 49.03 +13 59 57.9 o C41
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)