Astronomy:969 Leocadia

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969 Leocadia
Discovery [1]
Discovered byS. Belyavskyj
Discovery siteSimeiz Obs.
Discovery date5 November 1921
Designations
(969) Leocadia
Pronunciation/liːoʊˈkeɪdiə/[6]
Named afterunknown [2]
A921 VC · 1940 RV
1944 SB · 1948 UG
1963 PA · 1921 KZ
Minor planet categorymain-belt [1][3] · (inner)
background [4][5]
Orbital characteristics [3]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc98.12 yr (35,837 d)
|{{{apsis}}}|helion}}2.9694 AU
|{{{apsis}}}|helion}}1.9537 AU
2.4615 AU
Eccentricity0.2063
Orbital period3.86 yr (1,411 d)
Mean anomaly199.53°
Mean motion0° 15m 18.72s / day
Inclination2.2928°
Longitude of ascending node287.76°
91.332°
Physical characteristics
Mean diameter
  • 17.321±0.218 km[7]
  • 19.37±0.22 km[8]
  • 19.51±0.7 km[9]
Rotation period6.87±0.01 h[10][11]
Geometric albedo
  • 0.019±0.005[7]
  • 0.0435±0.003[9]
  • 0.045±0.001[8]
  • Tholen = FXU: [3]
  • B–V = 0.621±0.010[3]
  • U–B = 0.227±0.030[3]
Absolute magnitude (H)12.8[1][3]


969 Leocadia (prov. designation: A921 VC or 1921 KZ) is a very dark background asteroid from the inner regions of the asteroid belt, approximately 19 kilometers (12 miles) in diameter. It was discovered on 5 November 1921, by Russian astronomer Sergey Belyavsky at the Simeiz Observatory on the Crimean peninsula.[1] The uncommon F-type asteroid (FX) has a rotation period of 6.9 hours and is likely regular in shape.[10] Any reference of the asteroid's name to a person is unknown.[2]

Orbit and classification

Leocadia is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[4][5] It orbits the Sun in the inner main-belt at a distance of 2.0–3.0 AU once every 3 years and 10 months (1,411 days; semi-major axis of 2.46 AU). Its orbit has an eccentricity of 0.21 and an inclination of 2° with respect to the ecliptic.[3] The body's observation arc begins at Uccle Observatory in February 1933, more than a decade after its official discovery observation Simeiz Observatory on 5 November 1921.[1]

Naming

This minor planet is named after a Feminine Russian first name. Any reference of this name to a person or occurrence is unknown.[2]

Unknown meaning

Among the many thousands of named minor planets, Leocadia is one of 120 asteroids, for which no official naming citation has been published. All of these low-numbered asteroids have numbers between 164 Eva and 1514 Ricouxa and were discovered between 1876 and the 1930s, predominantly by astronomers Auguste Charlois, Johann Palisa, Max Wolf and Karl Reinmuth.[12]

Physical characteristics

In the Tholen classification (FXU:), Leocadia is an uncommon and dark F-type asteroid, somewhat similar to that of an X-type, though with an unusual (U) and noisy (:) spectra.[3]

Rotation period

In December 2006, a rotational lightcurve of Leocadia was obtained from photometric observations by Italian amateur astronomers Roberto Crippa and Federico Manzini at the Sozzago Astronomical Station (A12). Lightcurve analysis gave a rotation period of 6.87±0.01 hours with a brightness amplitude of 0.14±0.01 magnitude ({{{1}}}), which is indicative of a rather spherical, non-irregular shape.[10][11]

Diameter and albedo

According to the surveys carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), the Japanese Akari satellite, and the Infrared Astronomical Satellite IRAS, Leocadia measures 17.321±0.218, 19.37±0.22 and 19.51±0.7 kilometers in diameter, and its surface has a very low albedo of 0.019±0.005, 0.0435±0.003 and 0.045±0.001, respectively.[7][8][9] Additional measurements by the WISE telescope were published giving a mean-diameter as low as 13.58±3.09 km.[11] The Collaborative Asteroid Lightcurve Link adopts the result from IRAS, that is, an albedo of 0.0435 and a diameter of 19.51 kilometers based on an absolute magnitude of 9.22.[11]

An asteroid occultation on 19 August 2013, gave a best-fit ellipse dimension of 19.0 × 19.0 kilometers.[5] These timed observations are taken when the asteroid passes in front of a distant star. However the measurements for Leocadia were of poor quality.[5]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 Cite error: Invalid <ref> tag; no text was provided for refs named MPC-object
  2. ↑ 2.0 2.1 2.2 Schmadel, Lutz D. (2007). "(969) Leocadia". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 85. doi:10.1007/978-3-540-29925-7_970. ISBN 978-3-540-00238-3. 
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 3.7 "JPL Small-Body Database Browser: 969 Leocadia (A921 VC)". Jet Propulsion Laboratory. https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000969. 
  4. ↑ 4.0 4.1 "Asteroid 969 Leocadia – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=969. 
  5. ↑ 5.0 5.1 5.2 5.3 "Asteroid 969 Leocadia". Small Bodies Data Ferret. https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=969+Leocadia. 
  6. ↑ Noah Webster (1884) A Practical Dictionary of the English Language
  7. ↑ 7.0 7.1 7.2 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. 
  8. ↑ 8.0 8.1 8.2 Usui, Fumihiko; Kuroda, Daisuke; Müller, Thomas G.; Hasegawa, Sunao; Ishiguro, Masateru; Ootsubo, Takafumi et al. (October 2011). "Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey". Publications of the Astronomical Society of Japan 63 (5): 1117–1138. doi:10.1093/pasj/63.5.1117. Bibcode: 2011PASJ...63.1117U.  (online, AcuA catalog p. 153)
  9. ↑ 9.0 9.1 9.2 Tedesco, E. F.; Noah, P. V.; Noah, M.; Price, S. D. (October 2004). "IRAS Minor Planet Survey V6.0". NASA Planetary Data System 12: IRAS-A-FPA-3-RDR-IMPS-V6.0. Bibcode: 2004PDSS...12.....T. https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab. Retrieved 11 February 2020. 
  10. ↑ 10.0 10.1 10.2 Behrend, Raoul. "Asteroids and comets rotation curves – (969) Leocadia". Geneva Observatory. http://obswww.unige.ch/~behrend/page3cou.html#000969. 
  11. ↑ 11.0 11.1 11.2 11.3 "LCDB Data for (969) Leocadia". Asteroid Lightcurve Database (LCDB). http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=969. 
  12. ↑ Cite error: Invalid <ref> tag; no text was provided for refs named DOMPN-unknown

External links



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