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
2009-01-22 16:10:05 C 03 02 46.78 +07 30 29.8 17.0 r C20
2009-01-23 15:25:35 C 03 03 34.02 +07 39 41.1 16.3 r C20
2009-01-23 18:47:53 C 03 03 40.77 +07 41 00.6 17.7 r C20
2009-01-24 20:05:44 C 03 04 33.53 +07 50 58.9 16.3 r C20
2009-01-24 20:07:51 C 03 04 33.63 +07 50 59.7 16.3 r C20
2009-01-26 02:14:12 C 03 05 38.32 +08 02 52.0 c 704
2009-01-26 02:31:49 C 03 05 38.92 +08 02 59.0 c 704
2009-01-26 02:49:27 C 03 05 39.55 +08 03 06.0 c 704
2009-01-26 03:07:31 C 03 05 40.18 +08 03 13.3 c 704
2009-01-26 03:24:55 C 03 05 40.83 +08 03 20.5 c 704
2009-01-28 18:27:59 C 03 08 02.03 +08 28 02.4 17.6 o C20
2009-01-28 18:30:05 C 03 08 02.16 +08 28 03.4 17.7 o C20
2009-01-28 19:42:23 C 03 08 05.04 +08 28 32.9 w J46
2009-01-28 19:50:22 C 03 08 05.33 +08 28 35.9 w J46
2009-01-28 19:58:22 C 03 08 05.63 +08 28 38.9 w J46
2009-01-28 19:59:57 C 03 08 05.62 +08 28 37.8 o 510
2009-01-28 20:06:14 C 03 08 05.86 +08 28 40.4 o 510
2009-01-28 20:15:05 C 03 08 06.18 +08 28 43.9 o 510
2009-01-29 20:21:04 C 03 09 02.15 +08 38 08.8 16.7 r C20
2009-01-31 17:32:35 C 03 10 50.34 +08 55 43.5 16.8 o 084
2009-02-04 19:27:03 C 03 14 56.69 +09 33 28.4 16.9 r 084
2009-02-08 16:57:22 C 03 19 06.70 +10 09 01.9 16.9 r C20
2009-02-08 16:59:29 C 03 19 06.78 +10 09 02.8 16.8 r C20
2009-02-12 17:44:55 C 03 23 39.25 +10 45 11.9 o A32
2009-02-12 17:59:02 C 03 23 39.91 +10 45 17.1 o A32
2009-02-12 18:12:32 C 03 23 40.53 +10 45 22.0 o A32
2009-02-17 02:22:58 C 03 28 48.39 +11 23 32.0 c 704
2009-02-17 02:39:18 C 03 28 49.18 +11 23 37.7 c 704
2009-02-17 02:55:42 C 03 28 49.99 +11 23 43.4 c 704
2009-02-17 03:12:04 C 03 28 50.81 +11 23 49.7 c 704
2009-02-17 03:28:35 C 03 28 51.64 +11 23 55.4 c 704
2009-02-19 19:37:15 C 03 32 08.31 +11 46 57.3 r 084
2009-02-25 02:28:58 C 03 38 52.14 +12 31 30.3 c 704
2009-02-25 02:45:12 C 03 38 52.97 +12 31 35.4 c 704
2009-02-25 03:01:16 C 03 38 53.83 +12 31 41.3 c 704
2009-02-25 03:17:40 C 03 38 54.72 +12 31 46.8 c 704
2009-02-25 03:33:51 C 03 38 55.58 +12 31 52.6 c 704
2009-02-25 17:24:59 C 03 39 40.90 +12 36 36.9 17.5 r 084
2009-03-16 02:39:09 C 04 05 20.25 +14 57 57.6 r 703
2009-03-16 02:44:44 C 04 05 20.61 +14 57 59.5 r 703
2009-03-16 02:50:23 C 04 05 20.94 +14 58 00.6 r 703
2009-03-16 02:56:00 C 04 05 21.30 +14 58 02.5 r 703
2009-03-22 02:41:22 C 04 14 18.08 +15 39 15.1 c 704
2009-03-22 02:59:11 C 04 14 19.23 +15 39 19.9 c 704
2009-03-22 03:16:44 C 04 14 20.29 +15 39 24.9 c 704
2009-03-22 03:34:30 C 04 14 21.47 +15 39 29.5 c 704
2009-03-24 02:37:26 C 04 17 20.36 +15 52 24.5 r 703
2009-03-24 02:51:16 C 04 17 21.26 +15 52 27.4 r 703
2009-03-24 02:55:33 C 04 17 21.55 +15 52 28.4 r 703
2009-03-24 02:59:46 C 04 17 21.76 +15 52 29.3 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)