1349 Bechuana

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1349 Bechuana
001349-asteroid shape model (1349) Bechuana.png
Shape model of Bechuana from its lightcurve
Discovery [1]
Discovered by C. Jackson
Discovery site Johannesburg Obs.
Discovery date13 June 1934
Designations
(1349) Bechuana
Named after
 Bechuanaland [2]
(now Republic of Botswana)
1934 LJ ·1934 NH
1950 PA ·1950 QO
main-belt  ·(outer) [3]
background [4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 83.06 yr (30,338 days)
Aphelion 3.4872 AU
Perihelion 2.5416 AU
3.0144 AU
Eccentricity 0.1569
5.23 yr (1,912 days)
336.81°
0° 11m 17.88s / day
Inclination 10.049°
307.12°
305.30°
Physical characteristics
Dimensions23.773±0.282 km [5]
24.249±0.334 km [6]
25.80±0.37 km [7]
28.57±1.17 km [8]
46.30 km (calculated) [3]
15.681±0.0099 h [9]
15.6873±0.0001 h [10]
15.692±0.002 h [11]
0.057 (assumed) [3]
0.150±0.024 [8]
0.233±0.008 [7]
0.2610±0.0357 [5]
C X [12]  · C (assumed) [3]
10.20 [5] [7]  ·10.23±0.44 [12]  ·10.250±0.002(R) [9]  ·10.40 [3] [8]  ·10.5 [1]

    1349 Bechuana, provisional designation 1934 LJ, is a background asteroid from the outer regions of the asteroid belt, approximately 26 kilometers in diameter. It was discovered on 13 June 1934, by South-African astronomer Cyril Jackson at the Union Observatory in Johannesburg. [13] The asteroid was named for the former Bechuanaland, what is now the Republic of Botswana. [2]

    Contents

    Orbit and classification

    Bechuana is a non-family asteroid from the main belt's background population. [4] It orbits the Sun in the outer asteroid belt at a distance of 2.5–3.5  AU once every 5 years and 3 months (1,912 days; semi-major axis of 3.01 AU). Its orbit has an eccentricity of 0.16 and an inclination of 10° with respect to the ecliptic. [1] The body's observation arc begins with its official discovery observation at Johannesburg in June 1934. [13]

    Physical characteristics

    Bechuana has been characterized as both a C-type and X-type asteroid by Pan-STARRS photometric survey. The Collaborative Asteroid Lightcurve Link (CALL) assumes it to be a carbonaceous C-type. [3]

    Rotation period

    In December 2010, a rotational lightcurve of Bechuana was obtained from photometric observations by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 15.681 hours with a brightness variation of 0.29 magnitude ( U=2 ). [9] In January 2011, astronomers Pierre Antonini and Silvano Casulli measured a refined period of 15.692 hours with an amplitude of 0.30 ( U=3- ). [11]

    Poles

    A 2016-published lightcurve, using modeled photometric data from the Lowell Photometric Database, gave a concurring period of 15.6873 hours and determined two spin axis in ecliptic coordinates (λ, β) of (153.0°, 32.0°) and (314.0°, 46.0°). [10]

    Diameter and albedo

    According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Bechuana measures between 23.773 and 28.57 kilometers in diameter and its surface has an albedo between 0.150 and 0.2610. [5] [6] [7] [8]

    CALL assumes a standard albedo for carbonaceous asteroids of 0.057 and consequently calculates a much larger diameter of 46.30 kilometers based on an absolute magnitude of 10.4. [3]

    Naming

    This minor planet was named after the Bechuanaland, a British Protectorate from 1884 to 1966 and what is now the Republic of Botswana, north of South Africa. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 ( H 122 ). [2]

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    References

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