Astronomy:1020 Arcadia

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1020 Arcadia
Discovery[1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date7 March 1924
Designations
(1020) Arcadia
Pronunciation/ɑːrˈkeɪdiə/[6]
Named afterArcadia (Greek region)[2]
1924 QV · 1954 UA2
1975 EQ · 1977 QO2
Minor planet categorymain-belt[1][3] · (middle)
Agnia[4][5]
Orbital characteristics[3]
Epoch 23 March 2018 (JD 2458200.5)
Uncertainty parameter 0
Observation arc93.89 yr (34,293 d)
|{{{apsis}}}|helion}}2.9152 AU
|{{{apsis}}}|helion}}2.6666 AU
2.7909 AU
Eccentricity0.0445
Orbital period4.66 yr (1,703 d)
Mean anomaly18.189°
Mean motion0° 12m 41.04s / day
Inclination4.0598°
Longitude of ascending node180.71°
37.691°
Physical characteristics
Mean diameter10.067±0.090 km[7]
10.415±0.123 km[8]
13.02±0.49 km[9]
21.16 km (calculated)[10]
Rotation period17.02±0.02 h[11]
Geometric albedo0.057 (assumed)[10]
0.150±0.023[9]
0.2364±0.0456[8]
SMASS = S[3] · S[12]
S(SDSS-MFB)[10]
Absolute magnitude (H)12.0[3] · 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.[2]

Orbit and classification

Arcadia is a member of the Agnia family (514),[4][5] 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.[5] 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.[3] 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.[3] 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 ({{{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).[2]

References

  1. ↑ 1.0 1.1 1.2 1.3 "1020 Arcadia (1924 QV)". Minor Planet Center. https://www.minorplanetcenter.net/db_search/show_object?object_id=1020. 
  2. ↑ 2.0 2.1 2.2 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. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 "JPL Small-Body Database Browser: 1020 Arcadia (1924 QV)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001020. 
  4. ↑ 4.0 4.1 "Asteroid 1020 Arcadia – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=1020+Arcadia. 
  5. ↑ 5.0 5.1 5.2 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. doi:10.1111/j.1945-5100.2004.tb00950.x. Bibcode: 2004M&PS...39.1343S. https://www.researchgate.net/publication/228936637. Retrieved 8 March 2018. 
  6. ↑ Arcadian (3rd ed.), Oxford University Press, September 2005, http://oed.com/search?searchType=dictionary&q=Arcadian  (Subscription or UK public library membership required.)
  7. ↑ 7.0 7.1 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. doi:10.1088/0004-637X/741/2/68. Bibcode: 2011ApJ...741...68M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2011ApJ...741...68M. Retrieved 8 March 2018. 
  8. ↑ 8.0 8.1 8.2 8.3 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. doi:10.1088/0004-637X/741/2/90. Bibcode: 2011ApJ...741...90M. 
  9. ↑ 9.0 9.1 9.2 9.3 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. doi:10.1088/2041-8205/759/1/L8. Bibcode: 2012ApJ...759L...8M. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012ApJ...759L...8M. Retrieved 8 March 2018. 
  10. ↑ 10.0 10.1 10.2 10.3 10.4 10.5 10.6 "LCDB Data for (1020) Arcadia". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1020%7CArcadia. 
  11. ↑ 11.0 11.1 Gartrelle, Gordon M. (April 2012). "Lightcurve Results for Eleven Asteroids". The Minor Planet Bulletin 39 (2): 40–46. ISSN 1052-8091. Bibcode: 2012MPBu...39...40G. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2012MPBu...39...40G. Retrieved 8 March 2018. 
  12. ↑ 12.0 12.1 12.2 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. doi:10.1016/j.icarus.2015.08.007. Bibcode: 2015Icar..261...34V. http://adsabs.harvard.edu/cgi-bin/bib_query?bibcode=2015Icar..261...34V. Retrieved 8 March 2018. 
  13. ↑ 13.0 13.1 Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). "Identification and Dynamical Properties of Asteroid Families". Asteroids IV. pp. 297–321. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 978-0-8165-3213-1. Bibcode: 2015aste.book..297N. 

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