astro.wikisort.org - Asteroid

1046 Edwin, provisional designation 1924 UA, is a background asteroid from the outer regions of the asteroid belt, approximately 30 kilometers (20 miles) kilometers in diameter. It was discovered on 1 December 1924, by Belgian–American astronomer George Van Biesbroeck at the Yerkes Observatory in Wisconsin, United States, who named it after his son, Edwin Van Biesbroeck.[1] The potentially metallic asteroid has a short rotation period of 5.29 hours.[4]

1046 Edwin

Orbital diagram of 1046 Edwin
Discovery[1]
Discovered by	G. van Biesbroeck
Discovery site	Yerkes Obs.
Discovery date	1 December 1924
Designations
MPC designation	(1046) Edwin
Named after	Edwin Van Biesbroeck[2] (discoverer's son)
Alternative designations	1924 UA · 1949 RB 1949 YL
Minor planet category	main-belt[1][3] · (outer)[4] background[5]
Orbital characteristics[3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc	91.86 yr (33,553 d)
Aphelion	3.1769 AU
Perihelion	2.7895 AU
Semi-major axis	2.9832 AU
Eccentricity	0.0649
Orbital period (sidereal)	5.15 yr (1,882 d)
Mean anomaly	53.846°
Mean motion	0° 11m 28.68s / day
Inclination	7.8991°
Longitude of ascending node	10.745°
Argument of perihelion	47.898°
Physical characteristics
Mean diameter	25.15±0.66 km[6] 29.084±0.405 km[7] 36.355±0.604 km[8] 42.23 km (calculated)[4]
Synodic rotation period	5.29±0.01 h[9][lower-alpha 1] 5.2906±0.0001 h[10] 5.296±0.006 h[10] 5.30±0.02 h[11]
Geometric albedo	0.057 (assumed)[4] 0.1113±0.0145[8] 0.201±0.039[7] 0.235±0.014[6]
Spectral type	SMASS = Xe[3] · M[8]
Absolute magnitude (H)	10.20[6][8] · 10.6[3][4] 11.08±0.29[12]

Orbit and classification

Edwin is a non-family asteroid from the main belt's background population.[5] It orbits the Sun in the outer asteroid belt at a distance of 2.8–3.2 AU once every 5 years and 2 months (1,882 days; semi-major axis of 2.98 AU). Its orbit has an eccentricity of 0.06 and an inclination of 8° with respect to the ecliptic.[3] The body's observation arc begins with its first recorded observation at Heidelberg Observatory in March 1926, or 15 months after its official discovery observation at Yerkes Observatory.[1]

Physical characteristics

In the SMASS classification, Edwin is an Xe-subtype that transitions from the X-type to the very bright E-type asteroid[3] It has also been characterized as a metallic M-type asteroid by the Wide-field Infrared Survey Explorer (WISE).[8]

Rotation period

Since 2001, several rotational lightcurves of Edwin have been obtained from photometric observations by American William Koff at the Antelope Hills Observatory (H09) in Colorado,[9][lower-alpha 1] Richard Ditteon at the Oakley Observatory in Indiana,[11] and French amateur astronomers Pierre Antonini, René Roy and Stéphane Charbonnel.[10]

Analysis of the best-rated lightcurve by Pierre Antonini from November 2006, gave a rotation period of 5.2906 hours with a brightness amplitude of 0.27 magnitude (U=3).[4][10] While not being a fast rotator, it has a relatively short spin-rate for an asteroid of its size.

Diameter and albedo

According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's WISE telescope, Edwin measures between 25.15 and 36.355 kilometers in diameter and its surface has an albedo between 0.1113 and 0.235.[6][7][8]

The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and consequently calculates a larger diameter of 42.23 kilometers based on an absolute magnitude of 10.6.[4]

Naming

This minor planet was named after Edwin Van Biesbroeck, son of discoverer George Van Biesbroeck. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 99).[2]

Notes

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
• 1046 Edwin at AstDyS-2, Asteroids—Dynamic Site
  • Ephemeris · Observation prediction · Orbital info · Proper elements · Observational info
• 1046 Edwin at the JPL Small-Body Database
  • Close approach · Discovery · Ephemeris · Orbit diagram · Orbital elements · Physical parameters

На других языках

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[de] (1046) Edwin

(1046) Edwin ist ein Asteroid des Hauptgürtels, der am 1. Dezember 1924 vom belgischen Astronomen George Van Biesbroeck am Yerkes-Observatorium in Williams Bay, Wisconsin entdeckt wurde.

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- [en] 1046 Edwin

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