• Source: 1609 Brenda

1609 Brenda, provisional designation 1951 NL, is a stony asteroid from the central region of the asteroid belt, approximately 28 kilometers in diameter. It was discovered on 10 July 1951, by South African astronomer Ernest Johnson at the Johannesburg Observatory in South Africa, and named after his granddaughter, Brenda.




Orbit and classification


The S-type asteroid orbits the Sun in the central main-belt at a distance of 1.9–3.2 AU once every 4 years and 2 months (1,518 days). Its orbit has an eccentricity of 0.25 and an inclination of 19° with respect to the ecliptic. Brenda was first identified as 1925 EA at Simeiz Observatory in 1925. Its observation arc begins 17 years prior to its official discovery observation, with its identification 1934 JB, also made at Simeiz.




Physical characteristics


American astronomer Richard Binzel obtained the first rotational lightcurve of Brenda in June 1984. It gave a rotation period of 19.46 hours with a brightness variation of 0.16 magnitude (U=2). In June 2006, a period of 23±1 with an amplitude of 0.26 magnitude was derived from photometric observations made by French amateur astronomer René Roy (U=2).
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, Brenda measures between 26.27 and 29.64 kilometers in diameter, and its surface has an albedo between 0.115 and 0.133. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.1078 and a diameter of 29.59 kilometers with an absolute magnitude of 10.68.




Naming


This minor planet was named by the discoverer for his granddaughter, Brenda. The official naming citation was published by the Minor Planet Center on 20 February 1976 (M.P.C. 3931). Ernest Johnson is also known for the discovery of the periodic comet 48P/Johnson, using the Franklin-Adams Star Camera.




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
1609 Brenda at AstDyS-2, Asteroids—Dynamic Site
Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
1609 Brenda at the JPL Small-Body Database

Kata Kunci Pencarian:

• 1609 Brenda
• Brenda (disambiguation)
• Ernest Leonard Johnson
• Meanings of minor-planet names: 1001–2000
• Union Observatory
• List of minor planets: 1001–2000
• List of named minor planets: B
• List of named minor planets: 1000–1999
• 1608 Muñoz
• Dacres