4055 Magellan

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4055 Magellan
Discovery [1]
Discovered by E. Helin
Discovery site Palomar Obs.
Discovery date24 February 1985
Designations
(4055) Magellan
Pronunciation US: /məˈɛlən/ , UK: /məˈɡɛlən/ [2]
Named after
Ferdinand Magellan
(Portuguese navigator) [3]
1985 DO2 ·1988 OG
NEO  · Amor [1] [4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 32.40 yr (11,835 days)
Aphelion 2.4140 AU
Perihelion 1.2270 AU
1.8205 AU
Eccentricity 0.3260
2.46 yr (897 days)
303.89°
0° 24m 4.68s / day
Inclination 23.251°
164.85°
154.36°
Earth  MOID 0.2398 AU ·93.4 LD
Physical characteristics
Dimensions2.204±0.078 km [5]
2.49 km [6]
2.781±0.147 km [7]
6.384±0.005 h [8]
7.475±0.001 h [lower-alpha 1]
7.479±0.001 h [9]
7.4805±0.0013 h [10]
7.48202±0.0001 h [11]
7.488±0.001 [12]
7.496±0.005 h [13]
0.31 [6] [12]
0.330±0.067 [7]
0.36±0.27 [14]
0.415±0.071 [5]
V (Tholen) [1]
V (SMASS) [1]
V [15] [16] [17] [18] [19]
14.00 [18]  ·14.45±0.2(R) [lower-alpha 1]  ·14.515±0.002(R) [10]  ·14.6 [7]  ·14.64±0.56 [17]  ·14.7 [1]  ·14.9 [6] [19]  ·14.90±0.3 [5]

    4055 Magellan, provisional designation 1985 DO2, is a bright asteroid and near-Earth object of the Amor group. It is approximately 2.5 kilometers in diameter, and its orbit is moderately eccentric. It was discovered on 24 February 1985, by American astronomer Eleanor Helin at Palomar Observatory in California, United States. [4] It was later named for Portuguese explorer Ferdinand Magellan. [3]

    Contents

    Orbit and classification

    Magellan (center) as seen from ground in July 2010 CCD image of asteroid 4055 Magellan.png
    Magellan (center) as seen from ground in July 2010

    Magellan orbits the Sun in the inner main-belt at a distance of 1.2–2.4  AU once every 2 years and 6 months (897 days). Its orbit has an eccentricity of 0.33 and an inclination of 23° with respect to the ecliptic. [1]

    The first observation was made at the Australian Siding Spring Observatory, extending the asteroid's observation arc by just one month prior to its official discovery observation at Palomar. [4]

    It has a minimum orbital intersection distance with Earth of 0.2398 AU (35,900,000 km), which corresponds to 93.4 lunar distances. [1]

    Physical characteristics

    Being a V-type asteroid in the Tholen and SMASS taxonomy, Magellan is thought to have originated from the Rheasilvia crater, a large impact crater on the south-polar surface of 4 Vesta, which is the main-belt's second-most-massive asteroid after 1 Ceres.

    Diameter and albedo

    According to observations by the Keck Observatory and to the survey carried out by NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Magellan measures between 2.2 and 2.8 kilometers in diameter and its surface has a high albedo of 0.31 to 0.33. [5] [6] [7] The Collaborative Asteroid Lightcurve Link (LCDB) agrees with the Keck observations, adopting an albedo of 0.31 and a diameter of 2.49 kilometers. [19]

    Lightcurves

    Between 2000 and 2015, six rotational lightcurves of Magellan were obtained from photometric observations by astronomers Petr Pravec and Brian D. Warner, as well as by the Mexican Asteroid Photometry Campaign and the Palomar Transient Factory. The highest rated lightcurve by LCDB's standards was obtained by French amateur astronomer David Romeuf [20] in July 2015, which gave a rotation period of 7.48202±0.0001 hours with a brightness variation of 0.45 magnitude ( U=3 ). [11] The large variation suggests an elongated shape.

    Naming

    This minor planet was named after Portuguese navigator and explorer Ferdinand Magellan (Fernão de Magalhães; c.1480–1521), who led and died on the first circumnavigation of the Earth during 1519–1522. The minor planet is also named after the modern Magellan spacecraft, which was launched by NASA in 1989 and went on to map the surface of Venus. The Portuguese navigator is also honored by the craters Magelhaens on Mars and Magelhaens on the Moon. [3] The official naming citation was published by the Minor Planet Center on 2 December 1990 ( M.P.C. 17466). [21]

    See also

    Notes

    1. 1 2 Pravec (2000) web: rotation period 7.475±0.001 hours with a brightness amplitude of 0.46 mag and an undefined LCDB quality code (Pravec, P.; Wolf, M.; Sarounova, L. (2000)) Summary figures for (4055) Magellan at Collaborative Asteroid Lightcurve Link (CALL)

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