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
1998-11-26 08:36:50 C 05 30 38.800 +10 13 51.81 l 689
1998-11-27 08:31:14 C 05 29 14.240 +10 13 33.93 l 689
1998-11-28 22:15:02 C 05 26 59.09 +10 13 20.4 z 151
1998-11-28 22:28:11 C 05 26 58.29 +10 13 20.7 z 151
1998-12-14 22:25:01 C 05 03 29.92 +10 30 10.2 c 561
1998-12-14 22:31:55 C 05 03 29.51 +10 30 10.9 c 561
1998-12-14 22:45:00 C 05 03 28.70 +10 30 12.2 c 561
1998-12-14 22:56:10 C 05 03 28.06 +10 30 12.9 c 561
1998-12-15 03:39:45 C 05 03 11.51 +10 30 38.9 z 825
1998-12-15 03:51:45 C 05 03 10.78 +10 30 40.0 z 825
1998-12-15 04:03:45 C 05 03 10.07 +10 30 40.9 z 825
1998-12-15 07:24:18 C 05 02 58.22 +10 30 59.2 17.0 a 704
1998-12-15 07:45:37 C 05 02 56.92 +10 31 01.5 a 704
1998-12-15 08:07:02 C 05 02 55.63 +10 31 03.3 a 704
1998-12-15 08:28:17 C 05 02 54.30 +10 31 05.6 a 704
1998-12-15 08:49:34 C 05 02 53.07 +10 31 07.9 a 704
1998-12-15 20:14:30 C 05 02 13.48 +10 32 08.6 o 461
1998-12-15 20:51:13 C 05 02 11.31 +10 32 12.0 o 461
1998-12-15 21:48:25 C 05 02 07.90 +10 32 17.5 o 461
1998-12-15 22:24:27 C 05 02 05.76 +10 32 20.8 o 461
1998-12-15 22:59:11 C 05 02 03.69 +10 32 24.0 o 461
1998-12-15 23:23:43 C 05 02 02.23 +10 32 26.3 o 461
1998-12-16 02:20:07 C 05 01 52.21 +10 32 43.2 z 825
1998-12-16 02:32:07 C 05 01 51.48 +10 32 44.8 z 825
1998-12-16 02:56:07 C 05 01 50.11 +10 32 47.0 z 825
1998-12-16 19:46:18 C 05 00 51.91 +10 34 23.3 o 461
1998-12-16 20:51:25 C 05 00 48.09 +10 34 29.8 o 461
1998-12-16 21:44:41 C 05 00 44.93 +10 34 35.0 o 461
1998-12-22 02:00:35 C 04 53 55.45 +10 48 28.5 16.0 a 704
1998-12-22 02:33:18 C 04 53 53.68 +10 48 32.6 a 704
1998-12-22 03:05:56 C 04 53 51.93 +10 48 37.0 a 704
1998-12-22 03:38:36 C 04 53 50.16 +10 48 41.8 a 704
1998-12-22 04:11:28 C 04 53 48.44 +10 48 46.1 a 704
1998-12-23 20:55:02 C 04 51 43.19 +10 53 59.0 z 610
1998-12-23 21:02:02 C 04 51 42.83 +10 53 59.7 z 610
1998-12-23 21:10:12 C 04 51 42.40 +10 54 00.6 z 610
1998-12-23 21:17:17 C 04 51 42.03 +10 54 01.4 z 610
1998-12-23 21:25:18 C 04 51 41.61 +10 54 02.2 z 610
1999-01-07 05:03:44 C 04 37 46.50 +11 50 01.8 a 699
1999-01-07 05:44:25 C 04 37 45.20 +11 50 09.6 a 699
1999-01-07 06:21:08 C 04 37 44.06 +11 50 16.3 a 699
1999-01-13 04:32:10 C 04 34 07.085 +12 18 20.72 l 689
1999-01-15 04:23:49 C 04 33 11.455 +12 28 16.48 l 689
1999-01-16 04:19:02 C 04 32 46.945 +12 33 20.64 l 689
1999-01-17 21:57:02 C 04 32 09.26 +12 42 13.6 561
1999-01-17 22:15:19 C 04 32 08.99 +12 42 17.5 561
1999-01-17 22:27:59 C 04 32 08.81 +12 42 20.2 561
1999-01-19 21:53:00 C 04 31 34.16 +12 52 39.7 561
1999-01-19 22:04:15 C 04 31 34.03 +12 52 42.1 561
1999-01-19 22:15:15 C 04 31 33.90 +12 52 44.5 561
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)