1925 Franklin-Adams

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1925 Franklin-Adams (prov. designation: Template:Mp) is a stony background asteroid from the central regions of the asteroid belt, approximately Script error: No such module "convert". in diameter. It was discovered on 9 September 1934, by Dutch astronomer Hendrik van Gent at the Leiden Southern Station, annex to the Johannesburg Observatory in South Africa.[1] The bright asteroid has a short rotation period of less than 3 hours.[2] It was named after British amateur astronomer John Franklin Adams (1843–1912).[3]

Orbit and classification

Franklin-Adams is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[4] It orbits the Sun in the central asteroid belt at a distance of 2.1–3.0 AU once every 4 years and 1 month (1,489 days; semi-major axis of 2.55 AU). Its orbit has an eccentricity of 0.18 and an inclination of 8° with respect to the ecliptic.[5] The body's observation arc begins with its official discovery observation at Johannesburg.[1]

Naming

This minor planet named after British amateur astronomer John Franklin Adams (1843–1912), who created one of the earliest detailed, photographic atlases of the complete night sky (the Franklin-Adams plates or charts).[6] He later donated his 25-cm Franklin-Adams Star Camera (Franklin-Adams photographic refractor) to the Johannesburg Observatory, which lead to the discovery of Proxima Centauri.[3] The official Template:MoMP was published by the Minor Planet Center on 20 December 1983 (M.P.C. 8402Script error: No such module "Check for unknown parameters".).[7] Asteroid 982 Franklina, discovered by South African astronomer Harry Edwin Wood at Johannesburg was also Template:MoMP.

Physical characteristics

Franklin-Adams is an assumed stony S-type asteroid with a very high albedo of more than 0.3 (see below).[2][8]

Rotation period and poles

In January 2005, a rotational lightcurve of Franklin-Adams was obtained from photometric observations by French amateur astronomer René Roy. Lightcurve analysis gave a rotation period of 3.082 hours with a brightness amplitude of 0.23 magnitude (U=2Script error: No such module "Check for unknown parameters".).[9] In March 2010, photometry at the Palomar Transient Factory in California gave a period of 2.979 with an amplitude of 0.32 magnitude (U=2Script error: No such module "Check for unknown parameters".).[10] In January 2013, American astronomer Brian Warner obtained the so-far best rated lightcurve.Template:Efn It gave a period of 2.978 hours and an amplitude of 0.25 magnitude (U=3Script error: No such module "Check for unknown parameters".).[11]

In 2016, an international study modeled a lightcurve with a concurring period of 2.978301 hours and found a spin axis of (277.0°, 57.0°) and (66.0°, 48.0°) in ecliptic coordinates (λ, β) (U=n.a.Script error: No such module "Check for unknown parameters".).[12]

Diameter and albedo

According to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Franklin-Adams measures 8.864 kilometers in diameter and its surface has an unusually high albedo of 0.356,[13] while the Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 11.30 kilometers based on an absolute magnitude of 12.1.[8]

Notes

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References

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External links

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