908 Buda
{{Use dmy dates|date=February 2020}}
{{Infobox planet
| minorplanet = yes
| name = 908 Buda
| background = #D6D6D6
| image = 000908-asteroid shape model (908) Buda.png
| image_scale =
| caption = Modelled shape of Buda from its lightcurve
| discoverer = M. F. Wolf
| discovery_site = Heidelberg Obs.
| discovered = 30 November 1918
| mpc_name = (908) Buda
| alt_names = A918 WD{{·}}1963 ME
1918 EX
| pronounced = {{IPAc-en|'|b|uː|d|ə}}Noah Webster (1884) A Practical Dictionary of the English Language
| named_after = {{nowrap|Buda, part of the Hungarian}}
city of Budapest
| mp_category = main-belt{{·}}{{small|(inner)}}
background
| epoch = 31 May 2020 (JD 2459000.5)
| uncertainty = 0
| observation_arc = 101.18 yr (36,957 d)
| aphelion = 2.8390 AU
| perihelion = 2.1072 AU
| semimajor = 2.4731 AU
| eccentricity = 0.1480
| period = 3.89 yr (1,421 d)
| mean_anomaly = 357.41°
| mean_motion = {{Deg2DMS|0.2534|sup=ms}} / day
| inclination = 13.415°
| asc_node = 85.551°
| arg_peri = 23.523°
| pole_ecliptic_lat={{plainlist|
| mean_diameter = {{plainlist|
| rotation = {{val|14.572|0.005|ul=h}}{{efn|name=lightcurve-plot-Warner}}
| albedo = {{plainlist|
| spectral_type = {{plainlist|
}}
908 Buda (prov. designation: {{mp|A918 WD}} or {{mp|1918 EX}}) is a background asteroid from the inner regions of the asteroid belt, approximately {{convert|30|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered by German astronomer Max Wolf at the Heidelberg Observatory on 30 November 1918. 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.
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. 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. The body's observation arc begins at Heidelberg Observatory with its official discovery observation on 30 November 1918.
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 {{MoMP|908|naming}} citation was mentioned in The Names of the Minor Planets by Paul Herget in 1955 ({{small|H 88}}).
Physical characteristics
In the Bus–Binzel SMASS classification, Buda is an uncommon L-type, while in the Bus–DeMeo taxonomy, it is a D-type asteroid.
= 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 {{Obscode|716}} in Colorado. Analysis gave a classically shaped bimodal lightcurve with a rotation period of {{val|14.572|0.005}} hours and a brightness variation of {{val|0.29|0.02}} magnitude ({{small|U=3}}).{{efn|name=lightcurve-plot-Warner}} This supersedes a period determination by French amateur astronomer Laurent Bernasconi from January 2005, who determined a period of {{val|14.575|0.003}} hours with an amplitude of {{val|0.41|0.03}} magnitude ({{small|U=2+}}). Observations by Julian Oey in 2015 gave two similar periods ({{small|U=2/2}}).
In 2016, a modeled lightcurve using photometric data from various sources of an international collaboration of astronomers, rendered a concurring sidereal period of {{val|14.57498|0.00005}} and two spin axes of (40.0°, 5.0°) and (225.0°, 16.0°) in ecliptic coordinates (λ, β).
= 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 ({{val|24.37|1.1}}), ({{val|28.29|0.61}}) and ({{val|30.749|0.492}}) kilometers in diameter and its surface has an albedo of ({{val|0.1576|0.015}}), ({{val|0.118|0.006}}) and ({{val|0.087|0.007}}), respectively. 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. Alternative mean-diameter measurements published by the WISE team include ({{val|29.73|8.24|u=km}}) and ({{val|36.268|8.535|u=km}}) with corresponding albedos of ({{val|0.10|0.06}}) and ({{val|0.0859|0.0453}}).
Notes
{{notelist|refs=
{{efn|name=lightcurve-plot-Warner|1=[http://www.minorplanetobserver.com/pdolc/A908_2009.HTM Lightcurve plot of (908) Buda], Palmer Divide Observatory, B. D. Warner (2009) rotation period {{val||}} hours with a brightness amplitude of {{val|}} mag. Quality code of XYZ. Summary figures at the [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=908 LCDB].}}
}}
References
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|publisher = Jet Propulsion Laboratory
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|title = Dictionary of Minor Planet Names
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|doi = 10.1007/978-3-540-29925-7_909
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|title = 908 Buda (A918 WD)
|work = Minor Planet Center
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|access-date = 24 February 2020}}
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|title = LCDB Data for (908) Buda
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|journal = Astronomy and Astrophysics
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|bibcode = 2016A&A...586A.108H
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|doi = 10.1051/0004-6361/201527441
|arxiv = 1510.07422}}
|title = Asteroid 908 Buda
|work = Small Bodies Data Ferret
|url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=908+Buda
|access-date = 24 February 2020}}
|title = Asteroid 908 Buda – Proper Elements
|publisher = AstDyS-2, Asteroids – Dynamic Site
|url = https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=908
|access-date= 24 February 2020}}
}}
External links
- [http://www.minorplanet.info/PHP/OneAsteroidInfo.php Lightcurve Database Query] (LCDB), at www.minorplanet.info
- [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
- [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Geneva Observatory, Raoul Behrend
- [http://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
- {{AstDys|908}}
- {{JPL small body}}
{{Minor planets navigator |907 Rhoda |number=908 |909 Ulla}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Buda}}