810 Atossa
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_Atossa.png) Shape model of Atossa from its lightcurve | |
| Discovery[1] | |
|---|---|
| Discovered by | M. F. Wolf |
| Discovery site | Heidelberg Obs. |
| Discovery date | 8 September 1915 |
| Designations | |
| (810) Atossa | |
| Pronunciation | /əˈtɒsə/[2] |
Named after | Atossa (550–475 BC) (Persian queen)[3] |
| A915 RS · 1931 PF 1934 NB · 1947 PA 1915 XQ | |
| Orbital characteristics[4] | |
| Epoch 31 May 2020 (JD 2459000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 104.41 yr (38,136 d) |
| Aphelion | 2.5717 AU |
| Perihelion | 1.7853 AU |
| 2.1785 AU | |
| Eccentricity | 0.1805 |
| 3.22 yr (1,174 d) | |
| 198.29° | |
| 0° 18m 23.4s / day | |
| Inclination | 2.6122° |
| 152.69° | |
| 195.84° | |
| Physical characteristics | |
| 8.104±0.119 km[8][9] | |
| 4.3851±0.0004 h[10][11] | |
Pole ecliptic latitude | |
| 0.224±0.046[8][9] | |
| S (assumed)[10] | |
810 Atossa (prov. designation: A915 RS or 1915 XQ) is a bright and elongated background asteroid from the region of the Flora family, located in the inner portion of the asteroid belt. It was discovered on 8 September 1915, by German astronomer Max Wolf at the Heidelberg-Königstuhl State Observatory in southern Germany.[1] The presumed S-type asteroid has a rotation period of 4.4 hours and measures approximately 8 kilometers (5 miles) in diameter. It was named after the ancient Persian queen Atossa (550–475 BC).[3]
Atossa is a non-family asteroid of the main belt's background population when applying the synthetic hierarchical clustering method (HCM) by Nesvorný to its proper orbital elements.[6] However, in an older HCM-analysis by Zappalà from 1995,[7] this asteroid is considered a member of the Flora family (402), a giant asteroid family and the largest family of stony asteroids in the main-belt.[13]: 23 In a third HCM-analysis by Milani and Knežević (AstDyS), it is also a background asteroid, as this analysis does not recognize the Flora asteroid clan as a proper family.[5]
Atossa orbits the Sun in the inner asteroid belt at a distance of 1.8–2.6 AU once every 3 years and 3 months (1,174 days; semi-major axis of 2.18 AU). Its orbit has an eccentricity of 0.18 and an inclination of 3° with respect to the ecliptic.[4] The body's observation arc begins at Heidelberg Observatory with its official discovery observation on 8 September 1915.[1]
Naming
This minor planet was named after Atossa (550–475 BC), an ancient Persian queen, daughter of Cyrus, wife of Darius. The naming was also mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 80).[3] The asteroids 7209 Cyrus and 7210 Darius were named after her father and husband, respectively.[citation needed]
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