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
2007-02-05 06:23:33 C 07 08 33.73 +18 51 50.7 o 644
2007-02-07 12:09:12 C 07 06 26.89 +19 02 44.2 r 379
2007-02-07 12:17:38 C 07 06 26.56 +19 02 46.0 r 379
2007-02-07 12:44:21 C 07 06 25.53 +19 02 51.3 r 379
2007-02-07 12:52:47 C 07 06 25.17 +19 02 52.7 r 379
2007-02-07 22:37:27 C 07 06 02.98 +19 04 47.1 16.5 r 084
2007-02-07 22:40:36 C 07 06 02.89 +19 04 47.6 16.4 r 084
2007-02-08 21:04:21 C 07 05 13.34 +19 09 12.8 16.0 r 084
2007-02-08 21:07:31 C 07 05 13.23 +19 09 13.2 15.9 r 084
2007-02-09 02:17:13 C 07 05 02.12 +19 10 14.6 r 726
2007-02-09 02:22:36 C 07 05 02.13 +19 10 13.9 r 726
2007-02-09 02:26:46 C 07 05 01.86 +19 10 16.2 r 726
2007-02-09 02:30:57 C 07 05 01.70 +19 10 17.7 r 726
2007-02-09 02:39:18 C 07 05 01.40 +19 10 19.5 r 726
2007-02-09 20:38:00 C 07 04 22.94 +19 13 47.0 16.2 r 084
2007-02-09 20:41:09 C 07 04 22.81 +19 13 47.7 16.2 r 084
2007-02-11 00:20:52 C 07 03 25.66 +19 19 05.0 16.6 r 084
2007-02-11 00:24:02 C 07 03 25.58 +19 19 05.6 16.1 r 084
2007-02-11 19:16:44 C 07 02 48.39 +19 22 40.5 c A24
2007-02-11 19:18:11 C 07 02 48.36 +19 22 41.0 c A24
2007-02-11 20:21:10 C 07 02 46.25 +19 22 52.9 c A24
2007-02-11 20:48:54 C 07 02 45.29 +19 22 57.6 o B12
2007-02-11 20:50:57 C 07 02 45.22 +19 22 58.0 o B12
2007-02-11 20:55:07 C 07 02 45.06 +19 22 58.8 o B12
2007-02-11 20:57:08 C 07 02 45.01 +19 22 59.1 o B12
2007-02-11 20:59:11 C 07 02 44.95 +19 22 59.5 o B12
2007-02-11 21:01:16 C 07 02 44.88 +19 22 59.9 o B12
2007-02-11 21:05:21 C 07 02 44.73 +19 23 00.7 o B12
2007-02-11 22:28:35 C 07 02 41.94 +19 23 16.7 c A24
2007-02-11 22:30:02 C 07 02 41.93 +19 23 17.0 c A24
2007-02-12 23:09:54 C 07 01 54.89 +19 27 50.1 16.4 r 084
2007-02-12 23:13:03 C 07 01 54.81 +19 27 50.7 16.3 r 084
2007-02-13 05:57:35 C 07 01 42.42 +19 29 07.1 c 704
2007-02-13 06:13:39 C 07 01 41.89 +19 29 10.1 c 704
2007-02-13 06:29:41 C 07 01 41.38 +19 29 12.9 c 704
2007-02-13 06:46:00 C 07 01 40.86 +19 29 15.7 c 704
2007-02-13 07:02:22 C 07 01 40.24 +19 29 18.7 c 704
2007-02-13 11:38:38 C 07 01 32.14 +19 30 10.0 r 379
2007-02-13 11:47:29 C 07 01 31.87 +19 30 11.1 r 379
2007-02-13 11:49:41 C 07 01 31.78 +19 30 11.6 r 379
2007-02-13 19:46:35 C 07 01 17.47 +19 31 37.7 c A24
2007-02-13 19:48:02 C 07 01 17.43 +19 31 38.1 c A24
2007-02-13 20:30:41 C 07 01 16.13 +19 31 45.6 c A24
2007-02-13 21:03:17 C 07 01 15.10 +19 31 51.7 c A24
2007-02-13 23:33:46 C 07 01 10.47 +19 32 18.6 c A24
2007-02-13 23:35:13 C 07 01 10.42 +19 32 18.9 c A24
2007-02-15 19:41:24 C 06 59 55.46 +19 40 11.0 c A24
2007-02-15 19:42:51 C 06 59 55.44 +19 40 11.5 c A24
2007-02-15 20:02:04 C 06 59 54.90 +19 40 14.8 c A24
2007-02-15 20:22:49 C 06 59 54.31 +19 40 18.3 c A24
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)