406 Erna
Template:Short description Template:Use dmy dates Script error: No such module "infobox".Script error: No such module "Check for unknown parameters".
406 Erna, provisional designation Template:Mp, is a dark asteroid of the background population in the outer regions of the asteroid belt, approximately 46 kilometers in diameter. It was discovered by French astronomer Auguste Charlois at Nice Observatory on 22 August 1895.[1] The asteroid was presumably named after Erna Bidschof, the granddaughter of Johann Palisa.[2]
Orbit and classification
Erna is a non-family asteroid from the main belt's background population.[3] It orbits the Sun in the outer asteroid belt at a distance of 2.4–3.4 AU once every 4 years and 12 months (1,818 days). Its orbit has an eccentricity of 0.18 and an inclination of 4° with respect to the ecliptic.[4] The body's observation arc begins at the United States Naval Observatory in September 1905, more than 10 years after its official discovery observation at Nice.[1]
Physical characteristics
In the Tholen classification, Erna is a dark and primitive P-type asteroid.[4] It has also been characterized as such by polarimetric observations.[5]
Rotation period
In October 2005, a rotational lightcurve of Erna was obtained from photometric observations by French and Italian astronomers Raymond Poncy (177Script error: No such module "Check for unknown parameters".), Roberto Crippa (A12Script error: No such module "Check for unknown parameters".), Federico Manzini and Silvano Casulli. Lightcurve analysis gave a well-defined rotation period of 8.7893 hours with a brightness variation of 0.35 magnitude (U=3Script error: No such module "Check for unknown parameters".).[6] Another lightcurve from the Palomar Transient Factory in November 2010 gave a similar period of 8.790 hours with an amplitude of 0.35 magnitude (U=2Script error: No such module "Check for unknown parameters".).[7]
Spin axis
In 2013, an international study modeled a lightcurve from various data sources including the Uppsala Asteroid Photometric Catalogue and the Palomar Transient Factory survey. The modeling gave a concurring period of 8.79079 hours and determined two spin axis in ecliptic coordinates (λ, β) of: (357.0°, −49.0°) and (161.0°, −60.0°).[8]
Diameter and albedo
According to the surveys carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Erna measures between 41.52 and 49.19 kilometers in diameter and its surface has an albedo between 0.0524 and 0.060.[9][10][11][12][13][14]
The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0524 and a diameter of 49.19 kilometers based on an absolute magnitude of 10.36.[15][13]
Naming
This minor planet was likely named after Erna Bidschof, the granddaughter of Austrian astronomer Johann Palisa, who was one of the most prolific discoverer of minor planets at the time. Erna is the daughter of the astronomer Friedrich Bidschof (1864–1915) and his wife Helene (née Palisa).[2]
References
<templatestyles src="Reflist/styles.css" />
- ↑ a b Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ a b Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1". (online, AcuA catalog p. 153)
- ↑ Script error: No such module "Citation/CS1".
- ↑ a b Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "Citation/CS1".
- ↑ Script error: No such module "citation/CS1".
<ref> tag with name "Veres-2015" defined in <references> is not used in prior text.Script error: No such module "Check for unknown parameters".
External links
- Asteroid Lightcurve Database (LCDB), query form (info Template:Webarchive)
- Dictionary of Minor Planet Names, Google books
- Asteroids and comets rotation curves, CdR – Observatoire de Genève, Raoul Behrend
- Discovery Circumstances: Numbered Minor Planets (1)-(5000) – Minor Planet Center
- Template:AstDys
- Template:PAGENAMEBASE at the JPL Small-Body DatabaseTemplate:EditAtWikidata
Script error: No such module "Navbox". Script error: No such module "Navbox". Template:Authority control