1627 Ivar
.png)
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 | |
| MPC designation | (1627) Ivar |
|
Named after
|
Ivar Hertzsprung (discoverer's brother) |
| 1929 SH · 1957 NA 1957 XA |
|
| Amor · NEO | |
| Orbital characteristics | |
| Epoch 16 February 2017 (JD 2457800.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 87.24 yr (31,866 days) |
| Aphelion | 2.6015 AU |
| Perihelion | 1.1241 AU |
| 1.8628 AU | |
| Eccentricity | 0.3966 |
| 2.54 yr (929 days) | |
| 151.46° | |
| 0° 23m 15.72s / day | |
| Inclination | 8.4512° |
| 133.14° | |
| 167.77° | |
| Earth MOID | 0.1124 AU |
| Physical characteristics | |
| Dimensions |
8.370±0.075 km 9.12 km 9.9±2.8 km 10.2 km |
|
4.795 h 4.795±0.002 h 4.79517±0.00005 h 4.795170 h 4.7954±0.006 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) |
|
|
B–V = 0.872 U–B = 0.459 S (Tholen) S (SMASS) Srw · S |
|
| 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 a stony asteroid and near-Earth object of the Amor group, approximately 9 kilometers in diameter. It was discovered on 25 September 1929, by Danish astronomer Ejnar Hertzsprung at Leiden Southern Station, annex to the Johannesburg Observatory in South Africa.
The S-type asteroid orbits the Sun at a distance of 1.1–2.6 AU once every 2 years and 6 months (929 days). Its orbit has an eccentricity of 0.40 and an inclination of 8° with respect to the ecliptic.Ivar's observation arc begins with its official discovery observation in 1929, as no precoveries were taken, and no prior identifications were made. It has an Earth minimum orbit intersection distance of 0.1124 AU (16,800,000 km). The eccentric Amor asteroid is also a Mars-crosser. In 2074, it will pass Earth at 0.141 AU, closer than it actually approached Mars in 1975 (0.150 AU).
A large number of rotational light-curves of Ivar have been obtained from photometric observations since 1985 (see infobox). They give a well-defined rotation period between 4.795 and 4.80 hours with a brightness variation between 0.27 and 1.16 magnitude, indicative of its non-spheroidal shape (also see 3D-model image). Future photometric observations will show whether the YORP effect will slowly change the body's spin rate (as seen with 1862 Apollo).
...
Wikipedia