698 Ernestina
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_Ernestina.png) Modelled shape of Ernestina from its lightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | J. Helffrich |
| Discovery site | Heidelberg Obs. |
| Discovery date | 5 March 1910 |
| Designations | |
| (698) Ernestina | |
Named after | Ernst Wolf (son of Max Wolf)[2] |
| A910 ED · A908 WB 1910 JX | |
| main-belt[1][3] · (outer)[4] background[5][6][7] | |
| Orbital characteristics[3] | |
| Epoch 31 May 2020 (JD 2459000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 111.16 yr (40,601 d) |
| Aphelion | 3.1847 AU |
| Perihelion | 2.5490 AU |
| 2.8669 AU | |
| Eccentricity | 0.1109 |
| 4.85 yr (1,773 d) | |
| 269.92° | |
| 0° 12m 10.8s / day | |
| Inclination | 11.532° |
| 40.630° | |
| 98.687° | |
| Physical characteristics | |
| 5.0363±0.0005 h[11] | |
Pole ecliptic latitude | |
698 Ernestina (prov. designation: A910 ED or 1910 JX) is a background asteroid, approximately 27 kilometers (17 miles) in diameter, located in the outer regions of the asteroid belt. It was discovered on 5 March 1910, by German astronomer Joseph Helffrich at the Heidelberg-Königstuhl State Observatory.[1] The presumed carbonaceous C-type asteroid has a rotation period of 5.0 hours. It was named after Ernst Wolf, son of German astronomer and prolific discoverer of minor planets, Max Wolf.[2]
Ernestina is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[5][6][7] It orbits the Sun in the outer asteroid belt at a distance of 2.5–3.2 AU once every 4 years and 10 months (1,773 days; semi-major axis of 2.87 AU). Its orbit has an eccentricity of 0.11 and an inclination of 12° with respect to the ecliptic.[3] The asteroid was first observed as 1908 WB at Heidelberg Observatory on 28 November 1908. The body's observation arc begins with its official discovery observation on 5 March 1910.[1]
Naming
This minor planet was named after Ernst Wolf, son of German astronomer Max Wolf (1863–1932), who has discovered many asteroids at Heidelberg including some of the first near-Earth objects and Jupiter trojans. The naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 71).[2]
