• Source: 1302 Werra

1302 Werra, provisional designation 1924 SV, is a Themistian asteroid from the outer regions of the asteroid belt, approximately 30 kilometers in diameter. It was discovered on 28 September 1924, by German astronomer Karl Reinmuth at the Heidelberg-Königstuhl State Observatory. The asteroid was named for the river Werra in central Germany.




Orbit and classification


Werra is a Themistian asteroid that belongs to the Themis family (602), a very large family of carbonaceous asteroids, named after its parent body 24 Themis.
It orbits the Sun in the outer main-belt at a distance of 2.6–3.7 AU once every 5 years and 6 months (2,006 days; semi-major axis of 3.11 AU). Its orbit has an eccentricity of 0.18 and an inclination of 3° with respect to the ecliptic. The body's observation arc begins at Heidelberg with its official discovery observation in September 1924.




Physical characteristics


Werra is an assumed carbonaceous C-type asteroid, which is the overall spectral type for members of the Themis family.: 23 




= Rotation period

=
In March 2009, a fragmentary lightcurve of Werra was obtained from photometric observations by French amateur astronomer Pierre Antonini. Lightcurve analysis gave a poorly constraint rotation period of 2 days with a brightness amplitude of less than 0.1 magnitude. The result was later retracted at the Lightcurve Data Base (U=n.a.). As of 2017, no secure period has been obtained.




= Diameter and albedo

=
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Werra measures between 24.35 and 35.041 kilometers in diameter and its surface has an albedo between 0.0710 and 0.102.
The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.08 and calculates a diameter of 31.04 kilometers based on an absolute magnitude of 10.9.




Naming


This minor planet was named after the river Werra in central Germany. It merges the Fulda in Hannoversch-Münden, Lower Saxony, to form the river Weser. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 119).




References






External links


Asteroid Lightcurve Database (LCDB), query form (info Archived 16 December 2017 at the Wayback Machine)
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
1302 Werra at AstDyS-2, Asteroids—Dynamic Site
Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
1302 Werra at the JPL Small-Body Database

Kata Kunci Pencarian:

• 1302 Werra
• Meanings of minor-planet names: 1001–2000
• List of minor planets: 1001–2000
• Karl Wilhelm Reinmuth
• List of named minor planets: 1000–1999
• 1303 Luthera
• 1301 Yvonne
• List of named minor planets: W
• List of minor planets named after rivers
• List of towns in Thuringia