1020 Arcadia

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1020 Arcadia
Discovery [1]
Discovered by K. Reinmuth
Discovery site Heidelberg Obs.
Discovery date7 March 1924
Designations
(1020) Arcadia
Pronunciation /ɑːrˈkeɪdiə/ [2]
Named after
 Arcadia (Greek region) [3]
1924 QV ·1954 UA2
1975 EQ ·1977 QO2
main-belt [1] [4]  ·(middle)
Agnia [5] [6]
Orbital characteristics [4]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc 93.89 yr (34,293 d)
Aphelion 2.9152 AU
Perihelion 2.6666 AU
2.7909 AU
Eccentricity 0.0445
4.66 yr (1,703 d)
18.189°
0° 12m 41.04s / day
Inclination 4.0598°
180.71°
37.691°
Physical characteristics
Mean diameter
10.067±0.090  km [7]
10.415±0.123 km [8]
13.02±0.49 km [9]
21.16 km(calculated) [10]
17.02±0.02  h [11]
0.057 (assumed) [10]
0.150±0.023 [9]
0.2364±0.0456 [8]
SMASS = S [4]  · S [12]
S (SDSS-MFB) [10]
12.0 [4]  ·12.10 [8] [9] [10]
12.29±0.11 [12]

    1020 Arcadia, provisional designation 1924 QV, is a stony Agnia asteroid from the central regions of the asteroid belt, approximately 11 kilometers (7 miles) in diameter. It was discovered on 7 March 1924, by German astronomer Karl Reinmuth at the Heidelberg Observatory in Heidelberg, Germany. [1] The asteroid was named after the Greek region of Arcadia. [3]

    Contents

    Orbit and classification

    Arcadia is a member of the Agnia family ( 514 ), [5] [6] a very large family of stony asteroids with more than 2000 known members. [13] They most likely formed from the breakup of a basalt object, which in turn was spawned from a larger parent body that underwent igneous differentiation. [6] The family's parent body and namesake is the asteroid 847 Agnia. [13]

    It orbits the Sun in the central main-belt at a distance of 2.7–2.9  AU once every 4 years and 8 months (1,703 days; semi-major axis of 2.79 AU). Its orbit has an eccentricity of 0.04 and an inclination of 4° with respect to the ecliptic. [4] The body's observation arc begins at Heidelberg in March 1924, six days after its official discovery observation. [1]

    Physical characteristics

    In the SMASS classification, Arcadia is a common, stony S-type asteroid. [4] It has been characterized as an S-type by Pan-STARRS photometric survey, [12] as well as by SDSS-MFB (Masi Foglia Bus). [10]

    Rotation period

    In November 2011, a fragmentary rotational lightcurve of Arcadia was obtained from photometric observations by Gordon Gartrelle at the University of North Dakota. Lightcurve analysis gave a rotation period of 17.02 hours with a brightness amplitude of 0.05 magnitude ( U=1 ). [11] As of 2018, no secure period has been obtained. [10]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Arcadia measures between 10.067 and 13.02 kilometers in diameter and its surface has an albedo between 0.150 and 0.2364. [7] [8] [9] The Collaborative Asteroid Lightcurve Link assumes an albedo 0.057, i.e. an albedo for a carbonaceous rather than for a stony asteroid, and consequently calculates a much larger diameter of 21.16 kilometers based on an absolute magnitude of 12.1. [10] It may be speculated whether this anomaly is a glitch in the data base.

    Naming

    This minor planet was named after the Greek region of Arcadia in central Peloponnese. It is also a celebrated mythological region, where the shepherd god Pan lived. The official naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 ( H 97 ). [3]

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    References

    1. 1 2 3 4 "1020 Arcadia (1924 QV)". Minor Planet Center . Retrieved 8 March 2018.
    2. ↑ "Arcadian" . Oxford English Dictionary (Online ed.). Oxford University Press.(Subscription or participating institution membership required.)
    3. 1 2 3 Schmadel, Lutz D. (2007). "(1020) Arcadia". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 88. doi:10.1007/978-3-540-29925-7_1021. ISBN   978-3-540-00238-3.
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    5. 1 2 "Asteroid 1020 Arcadia – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 24 October 2019.
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    10. 1 2 3 4 5 6 7 "LCDB Data for (1020) Arcadia". Asteroid Lightcurve Database (LCDB). Retrieved 8 March 2018.
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