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
1980-10-13 15:27:06 A 03 42 54.14 -00 24 12.2 414
1980-10-13 15:44:03 A 03 42 53.29 -00 24 18.3 414
1980-10-29 04:30:00 A 03 21 07.49 -02 10 24.3 688
1980-10-29 05:06:59 A 03 21 05.01 -02 10 31.0 688
1980-10-29 13:03:55 A 03 20 34.14 -02 11 41.8 414
1980-10-29 13:27:21 A 03 20 32.65 -02 11 45.4 414
1980-10-29 17:21:59 A 03 20 17.19 -02 12 28.7 323
1980-10-29 17:57:00 A 03 20 14.86 -02 12 37.4 323
1980-11-07 16:41:59 A 03 06 34.45 -02 35 25.9 323
1980-11-13 14:14:53 A 02 58 14.37 -02 34 11.0 330
1980-11-14 05:12:28 A 02 57 24.30 -02 33 06.1 808
1980-11-14 05:56:21 A 02 57 21.73 -02 33 03.1 808
1980-11-29 14:20:59 A 02 41 20.22 -01 31 44.8 414
1980-11-29 14:37:57 A 02 41 19.68 -01 31 40.1 414
1980-11-30 20:01:01 A 02 40 27.34 -01 24 14.3 095
1980-12-03 04:02:45 A 02 38 56.79 -01 08 33.2 808
1980-12-03 04:57:36 A 02 38 55.41 -01 08 15.7 808
1980-12-04 16:05:00 A 02 38 05.64 -00 57 58.4 323
1980-12-30 02:24:00 A 02 36 46.44 +02 47 19.1 688
1980-12-30 03:24:59 A 02 36 47.29 +02 47 40.7 688
1982-01-20 00:31:42 A 10 42 10.03 +10 44 12.1 095
1982-01-21 00:29:57 A 10 41 36.03 +10 51 20.2 095
1982-01-24 08:57:00 A 10 39 28.16 +11 16 48.1 17.0 688
1982-01-24 10:32:59 A 10 39 25.36 +11 17 15.3 688
1982-01-30 09:22:00 A 10 34 46.18 +12 07 57.8 688
1982-01-30 10:57:59 A 10 34 42.58 +12 08 35.1 688
1982-02-14 21:45:16 A 10 18 18.25 +14 42 29.6 046
1982-02-14 22:05:40 A 10 18 17.14 +14 42 38.6 046
1982-02-16 21:54:56 A 10 15 50.33 +15 03 33.4 046
1982-02-16 22:15:21 A 10 15 49.30 +15 03 42.4 046
1982-02-20 08:01:59 A 10 11 32.53 +15 39 20.1 688
1982-02-20 08:55:00 A 10 11 29.71 +15 39 45.3 688
1982-02-28 06:54:59 A 10 01 24.30 +16 59 35.2 688
1982-02-28 07:43:59 A 10 01 21.76 +16 59 53.0 688
1982-03-21 04:54:00 A 09 38 39.07 +19 41 17.3 17.0 688
1982-03-21 06:18:59 A 09 38 36.03 +19 41 37.7 688
1984-01-05 05:37:59 A 06 57 04.03 +15 57 48.5 688
1984-01-08 04:16:00 A 06 53 04.56 +16 11 22.1 688
1984-01-08 05:21:59 A 06 53 00.53 +16 11 36.2 688
1985-06-12 03:00:47 A 20 40 40.72 +09 51 51.9 491
1985-06-12 03:10:45 A 20 40 42.52 +09 51 55.9 491
1985-06-15 00:19:55 A 20 53 53.27 +10 14 46.8 491
1985-06-15 00:29:54 A 20 53 55.18 +10 14 50.2 491
1985-06-15 00:39:52 A 20 53 57.05 +10 14 52.8 491
1985-06-19 04:49:28 A 21 13 48.92 +10 36 56.3 A 801
1985-06-19 06:28:10 A 21 14 08.32 +10 37 12.2 A 801
1985-06-20 05:21:39 A 21 18 48.56 +10 40 08.1 A 801
1985-06-21 05:39:52 A 21 23 48.30 +10 42 23.2 A 801
1985-06-22 05:37:51 A 21 28 46.65 +10 43 39.4 A 801
1985-06-23 01:00:29 A 21 32 49.38 +10 44 00.0 C 579
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)