1553 Bauersfelda

1553 Bauersfelda, provisional designation 1940 AD, is a stony Koronian asteroid from the outer regions of the asteroid belt, approximately 13 kilometers in diameter. It was discovered on 13 January 1940, by astronomer Karl Reinmuth at the Heidelberg Observatory in southwest Germany.[9] The asteroid was named after German engineer Walther Bauersfeld.[2]

1553 Bauersfelda
Discovery [1]
Discovered byK. Reinmuth
Discovery siteHeidelberg Obs.
Discovery date13 January 1940
Designations
(1553) Bauersfelda
Named after
Walther Bauersfeld [2]
(German engineer)
1940 AD
main-belt · Koronis [3]
background [4]
Orbital characteristics [1]
Epoch 4 September 2017 (JD 2458000.5)
Uncertainty parameter 0
Observation arc77.47 yr (28,296 days)
Aphelion3.1994 AU
Perihelion2.6132 AU
2.9063 AU
Eccentricity0.1009
4.95 yr (1,810 days)
236.42°
0° 11m 56.04s / day
Inclination3.2348°
110.97°
20.747°
Physical characteristics
Dimensions11.48 km (calculated)[3]
13.772±0.194 km[5]
14.346±0.123 km[6]
51.191±0.1354 h[7]
0.2181±0.0273[6]
0.24 (assumed)[3]
0.249±0.041[5]
SMASS = S [1] · S [3][8]
11.417±0.002 (R)[7] · 11.5[6] · 11.6[1] · 11.72±0.26[8] · 11.87[3]

    Orbit and classification

    Based on its orbital parameters, Bauersfelda is a member of the Koronis family (605),[3] a very large outer asteroid family with nearly co-planar ecliptical orbits. However, Bauersfelda turns out to be a non-family asteroid from the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[4]

    Bauersfelda orbits the Sun in the outer main-belt at a distance of 2.6–3.2 AU once every 4 years and 11 months (1,810 days). Its orbit has an eccentricity of 0.10 and an inclination of 3° with respect to the ecliptic.[1] The body's observation arc begins with its official discovery observation at Heidelberg in 1940.[9]

    Physical characteristics

    In the SMASS classification, Bauersfelda is a stony S-type asteroid.[1] It is also characterized as a S-type by PanSTARRS photometric survey,[8] which agrees with the Koronis family's overall spectral type.

    Rotation period

    While not being a slow rotator, Bauersfelda's period is significantly longer than that of most minor planets. In August 2012, a rotational lightcurve of this asteroid was obtained from photometric observations in the R-band by astronomers at the Palomar Transient Factory in California. Lightcurve analysis gave a rotation period of 51.191 hours with a brightness variation of 0.26 magnitude (U=2).[7]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Bauersfelda measures 13.772 and 14.346 kilometers in diameter and its surface has an albedo of 0.2181 and 0.249, respectively.[5][6] The Collaborative Asteroid Lightcurve Link assumes an albedo of 0.24 and calculates a diameter of 11.48 kilometers based on an absolute magnitude of 11.87.[3]

    Naming

    This minor planet was named after Walther Bauersfeld (1879–1959), a German engineer who worked at the optical manufacturer Zeiss (also see 851 Zeissia, which was named after the company's founder). Bauersfeld is known as the designer of the Zeiss made planetaria such as the Planetarium Jena. The asteroid's name was announced in the mid-1950s on the occasion of his 75th anniversary.[2] The official naming citation was published by the Minor Planet Center in November 1953 (M.P.C. 994).[10]

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    References
    1. "JPL Small-Body Database Browser: 1553 Bauersfelda (1940 AD)" (2017-07-03 last obs.). Jet Propulsion Laboratory. Retrieved 21 September 2017.
    2. Schmadel, Lutz D. (2007). "(1553) Bauersfelda". Dictionary of Minor Planet Names – (1553) Bauersfelda. Springer Berlin Heidelberg. p. 123. doi:10.1007/978-3-540-29925-7_1554. ISBN 978-3-540-00238-3.
    3. "LCDB Data for (1553) Bauersfelda". Asteroid Lightcurve Database (LCDB). Retrieved 21 September 2017.
    4. "Asteroid 1553 Bauersfelda – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 29 October 2019.
    5. Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121. Retrieved 21 September 2017.
    6. 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.
    7. Waszczak, Adam; Chang, Chan-Kao; Ofek, Eran O.; Laher, Russ; Masci, Frank; Levitan, David; et al. (September 2015). "Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry". The Astronomical Journal. 150 (3): 35. arXiv:1504.04041. Bibcode:2015AJ....150...75W. doi:10.1088/0004-6256/150/3/75. Retrieved 21 September 2017.
    8. 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 21 September 2017.
    9. "1553 Bauersfelda (1940 AD)". Minor Planet Center. Retrieved 21 September 2017.
    10. Schmadel, Lutz D. (2009). "Appendix – Publication Dates of the MPCs". Dictionary of Minor Planet Names – Addendum to Fifth Edition (2006–2008). Springer Berlin Heidelberg. p. 221. doi:10.1007/978-3-642-01965-4. ISBN 978-3-642-01964-7.

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