1627 Ivar
Light-curve-based 3D-model of Ivar | |
| Discovery | |
|---|---|
| Discovered by | E. Hertzsprung |
| Discovery site | Johannesburg Obs. (Leiden Southern Station) |
| Discovery date | 25 September 1929 |
| Designations | |
| (1627) Ivar | |
Named after | Ivar Hertzsprung (discoverer's brother) |
| 1929 SH · 1957 NA 1957 XA | |
| NEO · Amor | |
| Orbital characteristics | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.62 yr (32,002 days) |
| Aphelion | 2.6015 AU |
| Perihelion | 1.1240 AU |
| 1.8628 AU | |
| Eccentricity | 0.3966 |
| 2.54 yr (929 days) | |
| 229.02° | |
| 0° 23m 15.72s / day | |
| Inclination | 8.4513° |
| 133.14° | |
| 2023-Sep-09 | |
| 167.76° | |
| Earth MOID | 0.1117 AU · 43.5 LD |
| Physical characteristics | |
| Dimensions | ≈15×6×6 km 8.370±0.075 km 9.12 km 9.9±2.8 km 10.2 km |
| 4.795 h 4.795±0.002 h 4.795170 h 4.79517±0.00005 h 4.796 h 4.7961±0.0001 h 4.797 h 4.798 h 4.80 h | |
| 0.09±0.12 0.117 0.128±0.123 0.134±0.025 0.15 0.151 (taken) | |
| S (Tholen) · S (SMASS) Srw · S B–V = 0.872 U–B = 0.459 | |
| 12.87±0.1 · 12.87 · 12.90 · 12.99±0.25 · 13.00 · 13.17 · 13.2 · 13.22±0.23 · 13.24 | |
1627 Ivar (provisional designation 1929 SH) is an elongated stony asteroid and near-Earth object of the Amor group, approximately 15×6×6 km. It was discovered on 25 September 1929, by Danish astronomer Ejnar Hertzsprung at Leiden Southern Station, annex to the Johannesburg Observatory in South Africa. It was named after Ivar Hertzsprung, brother of the discoverer. 1627 Ivar was the first asteroid to be imaged by radar, in July 1985 by the Arecibo Observatory.