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
2019-01-17 06:01:20 C 01 17 30.99 -01 33 18.7 V T08
2019-01-17 06:03:20 C 01 17 31.15 -01 33 17.5 V T08
2019-01-17 06:08:46 C 01 17 31.54 -01 33 14.0 V T08
2019-01-17 06:12:05 C 01 17 31.79 -01 33 11.9 V T08
2019-01-17 06:20:45 C 01 17 32.47 -01 33 06.2 V T08
2019-01-17 06:30:44 C 01 17 33.23 -01 32 59.8 V T08
2019-01-18 10:33:37 C 01 19 44.30 -01 14 52.8 q D29
2019-01-18 10:53:59 C 01 19 45.86 -01 14 39.6 q D29
2019-01-18 11:14:21 C 01 19 47.42 -01 14 26.5 q D29
2019-01-19 06:07:59 C 01 21 15.51 -01 02 17.1 V T05
2019-01-19 06:14:46 C 01 21 16.03 -01 02 12.6 V T05
2019-01-19 06:22:46 C 01 21 16.64 -01 02 07.6 V T05
2019-01-21 05:24:53 C 01 24 55.88 -00 32 08.0 V T08
2019-01-21 05:46:08 C 01 24 57.50 -00 31 54.5 V T08
2019-01-21 06:00:32 C 01 24 58.59 -00 31 45.4 V T08
2019-01-21 06:12:51 C 01 24 59.54 -00 31 37.4 V T08
2019-01-23 05:16:37 C 01 28 38.60 -00 01 58.0 V T05
2019-01-23 05:27:17 C 01 28 39.41 -00 01 51.2 V T05
2019-01-23 05:37:02 C 01 28 40.16 -00 01 45.1 V T05
2019-01-23 05:45:32 C 01 28 40.81 -00 01 39.8 V T05
2019-01-25 04:58:05 C 01 32 20.25 +00 27 44.0 V T08
2019-01-25 05:07:34 C 01 32 20.99 +00 27 50.5 V T08
2019-01-25 05:19:31 C 01 32 21.90 +00 27 58.1 V T08
2019-01-25 05:26:31 C 01 32 22.435 +00 28 02.17 U F51
2019-01-25 05:29:59 C 01 32 22.69 +00 28 04.6 V T08
2019-01-25 05:32:25 C 01 32 22.891 +00 28 05.93 U F51
2019-01-25 05:38:21 C 01 32 23.343 +00 28 09.56 U F51
2019-01-25 05:43:59 C 01 32 23.77 +00 28 13.1 V T08
2019-01-25 05:44:15 C 01 32 23.757 +00 28 13.56 U F51
2019-01-25 05:52:15 C 01 32 24.39 +00 28 18.4 V T08
2019-01-25 05:59:43 C 01 32 24.96 +00 28 23.0 V T08
2019-01-25 06:07:49 C 01 32 25.57 +00 28 27.9 V T08
2019-01-27 05:32:15 C 01 36 05.75 +00 57 38.4 V T05
2019-01-27 05:42:09 C 01 36 06.51 +00 57 44.6 V T05
2019-01-27 05:51:20 C 01 36 07.20 +00 57 50.1 V T05
2019-01-27 06:00:39 C 01 36 07.94 +00 57 56.1 V T05
2019-01-29 05:09:55 C 01 39 46.77 +01 26 36.6 V T08
2019-01-29 05:19:50 C 01 39 47.53 +01 26 42.7 V T08
2019-01-29 05:30:17 C 01 39 48.34 +01 26 48.9 V T08
2019-01-29 05:40:04 C 01 39 49.07 +01 26 54.8 V T08
2019-01-31 18:02:05 C 01 44 29.14 +02 03 05.2 q K74
2019-01-31 18:12:55 C 01 44 29.98 +02 03 11.9 q K74
2019-01-31 18:23:45 C 01 44 30.80 +02 03 18.2 q K74
2019-02-02 05:01:51 C 01 47 11.42 +02 23 51.4 V T08
2019-02-02 05:02:31 C 01 47 11.45 +02 23 51.5 V T08
2019-02-02 05:20:26 C 01 47 12.79 +02 24 01.9 V T08
2019-02-02 05:21:45 C 01 47 12.90 +02 24 03.0 V T08
2019-02-04 06:21:44 C 01 51 00.01 +02 52 45.2 V T05
2019-02-04 06:33:54 C 01 51 00.94 +02 52 52.5 V T05
2019-02-04 06:45:29 C 01 51 01.83 +02 52 59.3 V T05
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)