908 Buda

908 Buda (prov. designation: A918 WD or 1918 EX) is a background asteroid from the inner regions of the asteroid belt, approximately 30 kilometers (19 miles) in diameter. It was discovered by German astronomer Max Wolf at the Heidelberg Observatory on 30 November 1918.[1] The uncommon L-type asteroid has a rotation period of 14.6 hours. It was named after Buda, the smaller part of the Hungarian city of Budapest.[3]

908 Buda
Modelled shape of Buda from its lightcurve
Discovery [1]
Discovered byM. F. Wolf
Discovery siteHeidelberg Obs.
Discovery date30 November 1918
Designations
(908) Buda
Pronunciation/ˈbuːdə/[2]
Named after
Buda, part of the Hungarian
city of Budapest [3]
A918 WD · 1963 ME
1918 EX
main-belt [1][4] · (inner)
background [5][6]
Orbital characteristics [4]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc101.18 yr (36,957 d)
Aphelion2.8390 AU
Perihelion2.1072 AU
2.4731 AU
Eccentricity0.1480
3.89 yr (1,421 d)
357.41°
0° 15m 12.24s / day
Inclination13.415°
85.551°
23.523°
Physical characteristics
Mean diameter
  • 24.37±1.1 km[7]
  • 28.29±0.61 km[8]
  • 30.749±0.492 km[9]
14.572±0.005 h[10][lower-alpha 1]
  • (40.0°, 5.0°) (λ1/β1)[6]
  • (225.0°, 16.0°) (λ2/β2)[6]
  • 0.087±0.007[9]
  • 0.118±0.006[8]
  • 0.1576±0.015[7]
10.8[1][4]

    Orbit and classification

    Buda is a non-family asteroid of the main belt's background population when applying the hierarchical clustering method to its proper orbital elements.[5][6] It orbits the Sun in the inner asteroid belt at a distance of 2.1–2.8 AU once every 3 years and 11 months (1,421 days; semi-major axis of 2.47 AU). Its orbit has an eccentricity of 0.15 and an inclination of 13° with respect to the ecliptic.[4] The body's observation arc begins at Heidelberg Observatory with its official discovery observation on 30 November 1918.[1]

    Naming

    This minor planet was named after Buda, the smaller part of the Hungarian capital city of Budapest (the larger part being Pest). It is located on the west bank of the Danube River. The asteroid's naming citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 (H 88).[3]

    Physical characteristics

    In the Bus–Binzel SMASS classification, Buda is an uncommon L-type,[4] while in the Bus–DeMeo taxonomy, it is a D-type asteroid.[6][11]

    Rotation period and poles

    In March 2009, a rotational lightcurve of Buda was obtained from photometric observations by Brian Warner at his Palmer Divide Observatory (716) in Colorado. Analysis gave a classically shaped bimodal lightcurve with a rotation period of 14.572±0.005 hours and a brightness variation of 0.29±0.02 magnitude (U=3).[10][lower-alpha 1] This supersedes a period determination by French amateur astronomer Laurent Bernasconi from January 2005, who determined a period of 14.575±0.003 hours with an amplitude of 0.41±0.03 magnitude (U=2+).[12] Observations by Julian Oey in 2015 gave two similar periods (U=2/2).[13]

    In 2016, a modeled lightcurve using photometric data from various sources of an international collaboration of astronomers, rendered a concurring sidereal period of 14.57498±0.00005 and two spin axes of (40.0°, 5.0°) and (225.0°, 16.0°) in ecliptic coordinates (λ, β).[14]

    Diameter and albedo

    According to the survey carried out by the Infrared Astronomical Satellite IRAS, the Japanese Akari satellite, and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), Buda measures (24.37±1.1), (28.29±0.61) and (30.749±0.492) kilometers in diameter and its surface has an albedo of (0.1576±0.015), (0.118±0.006) and (0.087±0.007), respectively.[7][8][9] The Collaborative Asteroid Lightcurve Link derives an albedo of 0.1509 and calculates a diameter of 24.33 kilometers based on an absolute magnitude of 10.74.[15] Alternative mean-diameter measurements published by the WISE team include (29.73±8.24 km) and (36.268±8.535 km) with corresponding albedos of (0.10±0.06) and (0.0859±0.0453).[6][15]

    Notes
    1. Lightcurve plot of (908) Buda, Palmer Divide Observatory, B. D. Warner (2009) rotation period hours with a brightness amplitude of mag. Quality code of XYZ. Summary figures at the LCDB.

    References
    1. "908 Buda (A918 WD)". Minor Planet Center. Retrieved 24 February 2020.
    2. Noah Webster (1884) A Practical Dictionary of the English Language
    3. Schmadel, Lutz D. (2007). "(908) Buda". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 81. doi:10.1007/978-3-540-29925-7_909. ISBN 978-3-540-00238-3.
    4. "JPL Small-Body Database Browser: 908 Buda (A918 WD)" (2020-02-05 last obs.). Jet Propulsion Laboratory. Retrieved 24 February 2020.
    5. "Asteroid 908 Buda – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 24 February 2020.
    6. "Asteroid 908 Buda". Small Bodies Data Ferret. Retrieved 24 February 2020.
    7. 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. Retrieved 24 February 2020.
    8. 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. Bibcode:2011PASJ...63.1117U. doi:10.1093/pasj/63.5.1117. Retrieved 24 February 2020. (online, AcuA catalog p. 153)
    9. 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.
    10. Warner, Brian D. (July 2009). "Asteroid Lightcurve Analysis at the Palmer Divide Observatory: 2008 December - 2009 March" (PDF). Minor Planet Bulletin. 36 (3): 109–116. Bibcode:2009MPBu...36..109W. ISSN 1052-8091.
    11. DeMeo, Francesca E.; Binzel, Richard P.; Slivan, Stephen M.; Bus, Schelte J. (July 2009). "An extension of the Bus asteroid taxonomy into the near-infrared" (PDF). Icarus. 202 (1): 160–180. Bibcode:2009Icar..202..160D. doi:10.1016/j.icarus.2009.02.005. Archived from the original (PDF) on 17 March 2014. Retrieved 24 February 2020. (Catalog Archived 29 March 2018 at the Wayback Machine at PDS)
    12. Behrend, Raoul. "Asteroids and comets rotation curves – (908) Buda". Geneva Observatory. Retrieved 24 February 2020.
    13. Oey, Julian; Williams, Hasen; Groom, Roger (July 2017). "Lightcurve Analysis of Asteroids from BMO and DRO in 2015" (PDF). Minor Planet Bulletin. 44 (3): 200–204. Bibcode:2017MPBu...44..200O. ISSN 1052-8091.
    14. Hanuš, J.; Ďurech, J.; Oszkiewicz, D. A.; Behrend, R.; Carry, B.; Delbo, M.; et al. (February 2016). "New and updated convex shape models of asteroids based on optical data from a large collaboration network". Astronomy and Astrophysics. 586: A108. arXiv:1510.07422. Bibcode:2016A&A...586A.108H. doi:10.1051/0004-6361/201527441. ISSN 0004-6361.
    15. "LCDB Data for (908) Buda". Asteroid Lightcurve Database (LCDB). Retrieved 24 February 2020.
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