1580 Betulia

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1580 Betulia
1580Betulia (Lightcurve Inversion).png
Lightcurve-based 3D-model of Betulia
Discovery [1]
Discovered by E. L. Johnson
Discovery site Johannesburg Obs.
Discovery date22 May 1950
Designations
(1580) Betulia
Pronunciation /bɛˈtjuːliə/
Named after
Betulia Toro Herrick
(wife of astronomer S. Herrick) [2]
1950 KA
NEO  · Amor [1] [3]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc 66.64 yr (24,342 days)
Aphelion 3.2684 AU
Perihelion 1.1258 AU
2.1971 AU
Eccentricity 0.4876
3.26 yr (1,190 days)
252.41°
0° 18m 9.36s / day
Inclination 52.096°
62.291°
159.50°
Earth  MOID 0.1365 AU ·53.2 LD
Physical characteristics
Dimensions3.82 km [4]
3.9 km [5]
4.2 km (CALL-LCDB) [6]
4.57 km [7]
5.37±0.04 km [8]
5.39±0.54 km [9]
5.8 km (Gehrels 1994) [1]
8.55±5.23 km [10]
6.130 h [11]
6.1324±0.0002 h [12]
6.134 h [13]
6.135±0.005 h [14]
6.13836 h [9] [15]
6.156 h [16]
6.48 h [17]
0.04±0.08 [10]
0.05 [18]
0.07±0.01 [8]
0.077 [7]
0.08(Gehrels 1994) [1]
0.09 (CALL-LCDB) [6]
0.11 [4]
0.17 [5]
Tholen = C [1] [6]  · B [19]
B–V = 0.656 [1]
U–B = 0.249 [1]
14.00 [19]  ·14.5 [10]  ·14.53 [7]  ·14.58 [5]  ·14.8 [1]  ·14.8±0.3 [12]  ·14.90 [8]  ·15.1 [4] [6]

    1580 Betulia, provisional designation 1950 KA, is an eccentric, carbonaceous asteroid, classified as near-Earth object of the Amor group, approximately 4.2 kilometers in diameter. It was discovered on 22 May 1950, by South African astronomer Ernest Johnson at the Union Observatory in Johannesburg. [3] The asteroid was named for Betulia Toro, wife of astronomer Samuel Herrick. [2]

    Contents

    Orbit and classification

    Betulia orbits the Sun at a distance of 1.1–3.3  AU once every 3 years and 3 months (1,190 days). Its orbit has an eccentricity of 0.49 and an inclination of 52° with respect to the ecliptic. [1] The body's observation arc begins with its official discovery observation at Johannesburg in 1950. [3]

    Close approaches

    Betulia is a near-Earth asteroid with an Earth minimum orbital intersection distance of 0.1365 AU (20,400,000 km), which corresponds to 53.2 lunar distances. [1] As an Amor asteroid, and contrary to the Apollo and Aten asteroids, it approaches Earth's orbit from beyond but does not cross it. Betulia is also a Mars-crosser due to its eccentric orbit. [1]

    Physical characteristics

    In the Tholen classification, Betulia is an unusual C-type asteroid, as near-Earth objects are typically of stony rather than carbonaceous composition. [1] Based on images taken by the Sloan Digital Sky Survey, the asteroid has also been characterized as a carbonaceous but "brighter" B-type asteroid. [19]

    Rotation period

    Several rotational lightcurves of Betulia were obtained from photometric observations since the 1970s. Analysis of the best-rated lightcurve gave a rotation period of 6.1324 hours with a brightness variation of 0.70 magnitude ( U=3 ), indicating that the body has a non-spheroidal shape. [12] Other observations gave a period between 6.130 and 6.48 hours. [11] [13] [14] [17]

    Poles

    Photometric and radiometric observations of Betulia were also used to model the asteroid's lightcurve. It gave a concurring period of 6.13836 hours as well as a spin axis of (133.0°, 22.0°) and (136.0°, 22.0°) in ecliptic coordinates (λ, β), respectively. [9] [15] The results supersede previously determined rotational poles (also see LCDB summary). [6] [11] [16]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Radar observations at the Arecibo Observatory in Puerto Rico, Tom Gehrels estimate from the Hazards due to Comets and Asteroids, and observations by Alan W. Harris using the NASA Infrared Telescope Facility on Mauna Kea, Hawaii, Betulia measures between 3.82 and 8.55 kilometers in diameter and its surface has an albedo between 0.04 and 0.17. [1] [4] [5] [8] [9] [10] [18]

    The Collaborative Asteroid Lightcurve Link takes an albedo of 0.09 and a diameter of 4.2 kilometers as best estimates and adopts an absolute magnitude of 15.1. [6]

    Naming

    This minor planet was named after Betulia Toro Herrick, wife of Samuel Herrick (1911–1974), an American astronomer who specialized in celestial mechanics. Herrick had studied the asteroid's orbit, and requested the name, along with that of 1685 Toro. [2] [20] The official naming citation was published by the Minor Planet Center in May 1952 ( M.P.C. 768). [21]

    Further reading

    Related Research Articles

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    References

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