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
2010-04-01 22:14:51 C 09 40 41.20 +20 16 17.1 15.8 o 084
2010-04-01 22:18:01 C 09 40 41.15 +20 16 17.5 15.6 o 084
2010-04-02 21:42:33 C 09 40 12.59 +20 19 20.0 16.2 u C20
2010-04-02 21:44:39 C 09 40 12.56 +20 19 20.2 16.2 u C20
2010-04-04 02:56:58 C 09 39 40.16 +20 22 49.6 r H53
2010-04-04 03:01:58 C 09 39 40.05 +20 22 50.3 r H53
2010-04-04 03:06:58 C 09 39 39.96 +20 22 50.9 r H53
2010-04-04 03:12:04 C 09 39 39.87 +20 22 51.4 r H53
2010-04-04 03:17:04 C 09 39 39.75 +20 22 52.1 r H53
2010-04-04 03:22:04 C 09 39 39.65 +20 22 52.6 r H53
2010-04-05 21:52:26 C 09 38 57.81 +20 27 18.7 o B75
2010-04-05 21:54:30 C 09 38 57.82 +20 27 18.8 o B75
2010-04-05 21:56:01 C 09 38 57.78 +20 27 18.8 o B75
2010-04-05 22:19:03 C 09 38 57.39 +20 27 21.5 u 160
2010-04-05 22:21:14 C 09 38 57.36 +20 27 21.8 u 160
2010-04-05 22:23:26 C 09 38 57.34 +20 27 21.6 u 160
2010-04-05 23:17:59 C 09 38 56.38 +20 27 25.5 16.1 u C20
2010-04-05 23:20:06 C 09 38 56.35 +20 27 25.7 16.2 u C20
2010-04-06 22:30:34 C 09 38 36.58 +20 29 33.0 16.0 u C20
2010-04-06 22:32:41 C 09 38 36.57 +20 29 32.7 16.2 u C20
2010-04-08 21:42:07 C 09 38 02.68 +20 33 14.1 u B50
2010-04-08 22:21:57 C 09 38 02.28 +20 33 16.8 u B50
2010-04-08 22:35:12 C 09 38 02.16 +20 33 17.2 u B50
2010-04-08 22:40:22 C 09 38 02.09 +20 33 17.6 u B50
2010-04-09 02:35:54 C 09 37 59.80 +20 33 34.8 r H53
2010-04-09 02:41:55 C 09 37 59.75 +20 33 35.0 r H53
2010-04-09 02:47:54 C 09 37 59.66 +20 33 35.4 r H53
2010-04-09 02:53:55 C 09 37 59.63 +20 33 35.8 r H53
2010-04-09 02:59:54 C 09 37 59.50 +20 33 36.4 r H53
2010-04-09 03:05:54 C 09 37 59.42 +20 33 36.7 r H53
2010-04-10 20:48:00 C 09 37 37.17 +20 36 02.1 16.2 u 084
2010-04-10 23:19:39 C 09 37 35.94 +20 36 09.2 16.6 u 084
2010-04-11 02:58:53 C 09 37 34.50 +20 36 23.3 r H53
2010-04-11 03:03:53 C 09 37 34.49 +20 36 23.6 r H53
2010-04-11 03:08:53 C 09 37 34.42 +20 36 23.7 r H53
2010-04-11 03:13:53 C 09 37 34.40 +20 36 24.0 r H53
2010-04-11 03:18:53 C 09 37 34.36 +20 36 24.1 r H53
2010-04-11 03:23:53 C 09 37 34.29 +20 36 24.5 r H53
2010-04-11 20:35:45 C 09 37 27.42 +20 37 09.6 16.7 u 084
2010-04-12 02:33:54 C 09 37 25.39 +20 37 26.5 r H53
2010-04-12 02:38:54 C 09 37 25.36 +20 37 26.9 r H53
2010-04-12 02:43:54 C 09 37 25.33 +20 37 27.0 r H53
2010-04-12 02:48:54 C 09 37 25.28 +20 37 27.3 r H53
2010-04-12 02:53:54 C 09 37 25.25 +20 37 27.4 r H53
2010-04-12 02:58:54 C 09 37 25.22 +20 37 27.6 r H53
2010-04-12 20:41:24 C 09 37 19.66 +20 38 04.8 16.1 u 084
2010-04-12 20:44:35 C 09 37 19.64 +20 38 04.9 16.2 u 084
2010-04-13 02:16:42 C 09 37 18.31 +20 38 18.2 r H53
2010-04-13 02:21:44 C 09 37 18.27 +20 38 18.4 r H53
2010-04-13 02:26:45 C 09 37 18.27 +20 38 18.7 r H53
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)