15268 Wendelinefroger, provisional designation ', is a stony, spheroidal, and binary Nysian

asteroid An asteroid is a minor planet—an object larger than a meteoroid that is neither a planet nor an identified comet—that orbits within the Solar System#Inner Solar System, inner Solar System or is co-orbital with Jupiter (Trojan asteroids). As ...

from the inner regions of the

asteroid belt The asteroid belt is a torus-shaped region in the Solar System, centered on the Sun and roughly spanning the space between the orbits of the planets Jupiter and Mars. It contains a great many solid, irregularly shaped bodies called asteroids ...

, approximately 3.4 kilometers in diameter. It was discovered on 18 November 1990, by Belgian astronomer

Eric Elst Eric Walter Elst (30 November 1936 – 2 January 2022) was a Belgian astronomer at the Royal Observatory of Belgium in Uccle and a prolific discoverer of asteroids. The Minor Planet Center ranks him among the top 10 discoverers of minor planets wi ...

at ESO's

La Silla Observatory La Silla Observatory is an astronomical observatory in Chile with three telescopes built and operated by the European Southern Observatory (ESO). Several other telescopes are also located at the site and are partly maintained by ESO. The observato ...

in northern Chile, and named after Belgian singer Wendeline Froger.

Orbit

The S-type asteroid orbits the Sun in the inner main-belt at a distance of 1.8–2.9 AU once every 3 years and 8 months (1,329 days). Its orbit has an

eccentricity Eccentricity or eccentric may refer to: * Eccentricity (behavior), odd behavior on the part of a person, as opposed to being "normal" Mathematics, science and technology Mathematics * Off-Centre (geometry), center, in geometry * Eccentricity (g ...

of 0.23 and an

inclination Orbital inclination measures the tilt of an object's orbit around a celestial body. It is expressed as the angle between a reference plane and the orbital plane or axis of direction of the orbiting object. For a satellite orbiting the Eart ...

of 3 ° with respect to the

ecliptic The ecliptic or ecliptic plane is the orbital plane of Earth's orbit, Earth around the Sun. It was a central concept in a number of ancient sciences, providing the framework for key measurements in astronomy, astrology and calendar-making. Fr ...

. It was first identified as at Crimea–Nauchnij in 1979, extending the asteroid's

observation arc In observational astronomy, the observation arc (or arc length) of a Solar System body is the time period between its earliest and latest observations, used for tracing the body's path. It is usually given in days or years. The term is mostly use ...

by 11 years prior to its discovery.

Physical characteristics

Primary

In October 2008, a rotational

lightcurve In astronomy, a light curve is a graph (discrete mathematics), graph of the Radiance, light intensity of a celestial object or region as a function of time, typically with the magnitude (astronomy), magnitude of light received on the ''y''-axis ...

was obtained from photometric observations at the Leura Observatory (), Australia. It gave a

rotation period In astronomy, the rotation period or spin period of a celestial object (e.g., star, planet, moon, asteroid) has two definitions. The first one corresponds to the '' sidereal rotation period'' (or ''sidereal day''), i.e., the time that the objec ...

of 2.422 hours with a low brightness variation of 0.07 magnitude, which indicates that the asteroid is of nearly

spheroidal A spheroid, also known as an ellipsoid of revolution or rotational ellipsoid, is a quadric surface obtained by rotating an ellipse about one of its principal axes; in other words, an ellipsoid with two equal semi-diameters. A spheroid has circu ...

shape (). The ''Collaborative Asteroid Lightcurve Link'' (CALL) assumes a standard

albedo Albedo ( ; ) is the fraction of sunlight that is Diffuse reflection, diffusely reflected by a body. It is measured on a scale from 0 (corresponding to a black body that absorbs all incident radiation) to 1 (corresponding to a body that reflects ...

for stony asteroids of 0.20 and calculates a diameter of 3.4 kilometer with an absolute magnitude of 14.7.

Secondary

During the photometric observations in 2008, a

minor-planet moon A minor-planet moon is an astronomical object that orbits a minor planet as its natural satellite. , there are 457 minor planets known or suspected to have moons. Discoveries of minor-planet moons (and binary objects, in general) are important ...

was also discovered, orbiting ''Wendelinefroger'' every hours at a distance of 8.7 kilometers. Based on mutual occultations of ''Wendelinefroger'' and its moon, the diameter ratio for the two bodies is at least 0.24 (i.e. secondary-to-primary mean diameter ratio), which translates into an estimated diameter of 0.8 kilometer or more for the asteroid's moon, using CALL's calculated diameter for the primary.

Naming

This

minor planet According to the International Astronomical Union (IAU), a minor planet is an astronomical object in direct orbit around the Sun that is exclusively classified as neither a planet nor a comet. Before 2006, the IAU officially used the term ''minor ...

is named in honour of Belgian female singer Wendeline Froger (born 1948), who has a soprano voice and performs at church celebrations, weddings and for selected audiences at her residence. She has a preference to sing

Lieder In the Western classical music tradition, ( , ; , ; ) is a term for setting poetry to classical music. The term is used for any kind of song in contemporary German and Dutch, but among English and French speakers, is often used interchangea ...

Robert Schumann Robert Schumann (; ; 8 June 181029 July 1856) was a German composer, pianist, and music critic of the early Romantic music, Romantic era. He composed in all the main musical genres of the time, writing for solo piano, voice and piano, chamber ...

, after whom the minor planet 4003 Schumann is named. The approved naming citation was published by the

Minor Planet Center The Minor Planet Center (MPC) is the official body for observing and reporting on minor planets under the auspices of the International Astronomical Union (IAU). Founded in 1947, it operates at the Smithsonian Astrophysical Observatory. Funct ...

on 12 December 2008 ().

Orbit

Physical characteristics

Primary

Secondary

Naming

Notes

References

External links