1020 Arcadia

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]

1020 Arcadia
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg 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 arc93.89 yr (34,293 d)
Aphelion2.9152 AU
Perihelion2.6666 AU
2.7909 AU
Eccentricity0.0445
4.66 yr (1,703 d)
18.189°
0° 12m 41.04s / day
Inclination4.0598°
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]

    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 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]

    References
    1. "1020 Arcadia (1924 QV)". Minor Planet Center. Retrieved 8 March 2018.
    2. "Arcadian". Oxford English Dictionary (3rd ed.). Oxford University Press. September 2005. (Subscription or UK public library membership required.)
    3. Schmadel, Lutz D. (2007). "(1020) Arcadia". Dictionary of Minor Planet Names – (1020) Arcadia. Springer Berlin Heidelberg. p. 88. doi:10.1007/978-3-540-29925-7_1021. ISBN 978-3-540-00238-3.
    4. "JPL Small-Body Database Browser: 1020 Arcadia (1924 QV)" (2018-01-27 last obs.). Jet Propulsion Laboratory. Retrieved 8 March 2018.
    5. "Asteroid 1020 Arcadia – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 24 October 2019.
    6. Sunshine, Jessica M.; Bus, Schelte J.; McCoy, Timothy J.; Burbine, Thomas H.; Corrigan, Catherine M.; Binzel, Richard P. (August 2004). "High-calcium pyroxene as an indicator of igneous differentiation in asteroids and meteorites". Meteoritics and Planetary Science. 39 (8): 1343–1357. Bibcode:2004M&PS...39.1343S. doi:10.1111/j.1945-5100.2004.tb00950.x. Retrieved 8 March 2018.
    7. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Dailey, J.; et al. (November 2011). "Main Belt Asteroids with WISE/NEOWISE. I. Preliminary Albedos and Diameters". The Astrophysical Journal. 741 (2): 20. arXiv:1109.4096. Bibcode:2011ApJ...741...68M. doi:10.1088/0004-637X/741/2/68. Retrieved 8 March 2018.
    8. Mainzer, A.; Grav, T.; Masiero, J.; Hand, E.; Bauer, J.; Tholen, D.; et al. (November 2011). "NEOWISE Studies of Spectrophotometrically Classified Asteroids: Preliminary Results". The Astrophysical Journal. 741 (2): 25. arXiv:1109.6407. Bibcode:2011ApJ...741...90M. doi:10.1088/0004-637X/741/2/90.
    9. Masiero, Joseph R.; Mainzer, A. K.; Grav, T.; Bauer, J. M.; Cutri, R. M.; Nugent, C.; et al. (November 2012). "Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids". The Astrophysical Journal Letters. 759 (1): 5. arXiv:1209.5794. Bibcode:2012ApJ...759L...8M. doi:10.1088/2041-8205/759/1/L8. Retrieved 8 March 2018.
    10. "LCDB Data for (1020) Arcadia". Asteroid Lightcurve Database (LCDB). Retrieved 8 March 2018.
    11. Gartrelle, Gordon M. (April 2012). "Lightcurve Results for Eleven Asteroids". The Minor Planet Bulletin. 39 (2): 40–46. Bibcode:2012MPBu...39...40G. ISSN 1052-8091. Retrieved 8 March 2018.
    12. Veres, Peter; Jedicke, Robert; Fitzsimmons, Alan; Denneau, Larry; Granvik, Mikael; Bolin, Bryce; et al. (November 2015). "Absolute magnitudes and slope parameters for 250,000 asteroids observed by Pan-STARRS PS1 - Preliminary results". Icarus. 261: 34–47. arXiv:1506.00762. Bibcode:2015Icar..261...34V. doi:10.1016/j.icarus.2015.08.007. Retrieved 8 March 2018.
    13. Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). Identification and Dynamical Properties of Asteroid Families. Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.

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