Английская Википедия:5028 Halaesus

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5028 Halaesus Шаблон:IPAc-en is a Jupiter trojan from the Greek camp, approximately Шаблон:Convert in diameter. It was discovered on 23 January 1988 by American astronomer Carolyn Shoemaker at the Palomar Observatory in California. The dark D-type asteroid has a rotation period of 24.9 hours and belongs to the 100 largest Jupiter trojans. It was named after Halaesus from Greek mythology.

Orbit and classification

Halaesus is a Jovian asteroid orbiting in the leading Greek camp at Jupiter's Шаблон:L4 Lagrangian point, 60° ahead of its orbit in a 1:1 resonance Шаблон:Crossreference. It is a non-family asteroid in the Jovian background population.

It orbits the Sun at a distance of 4.57–5.95 AU once every 12 years and 1 month (4,408 days; semi-major axis of 5.26 AU). Its orbit has an eccentricity of 0.13 and an inclination of 21° with respect to the ecliptic.

The asteroid was first observed as Шаблон:Mp at CERGA Observatory in October 1985. The body's observation arc begins with its official discovery observation at Palomar in January 1988.

Physical characteristics

In the SDSS-based taxonomy, Halaesus is a D-type asteroid. Pan-STARRS' survey also characterized it as a D-type, the most common spectral type among the Jupiter trojan population. It has a typical V–I color index of 0.90.

Rotation period

In September 1996, photometric observations of Halaesus were made by Italian astronomer Stefano Mottola, using the now decommissioned Bochum 0.61-metre Telescope at ESO's La Silla Observatory in Chile. The resulting rotational lightcurve showed a well-defined period of Шаблон:Val hours with a brightness variation of Шаблон:Val in magnitude (Шаблон:Small).

In August 2015, observations by the Kepler space telescope gave two period determinations of 25.052 and 29.95 hours with an amplitude of 0.23 and 0.19 magnitude, respectively (Шаблон:Small).

Diameter and albedo

According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Halaesus measures 50.77 kilometers in diameter and its surface has an albedo of 0.057. The Collaborative Asteroid Lightcurve Link adopts an albedo of 0.057 and a diameter 50.77 of kilometers based on an absolute magnitude of 10.2.

Naming

This minor planet was named from Greek mythology after Halaesus, a son of king Agamemnon, after whom the asteroid 911 Agamemnon is named. The official naming citation was published by the Minor Planet Center on 4 June 1993 (Шаблон:Small).

External links

• Asteroid Lightcurve Database (LCDB), query form (info Шаблон:Webarchive)
• Dictionary of Minor Planet Names, Google books
• Discovery Circumstances: Numbered Minor Planets (5001)-(10000) – Minor Planet Center
• Asteroid 5028 Halaesus at the Small Bodies Data Ferret
• Шаблон:AstDys
• Шаблон:JPL small body