941 Murray
{{Use dmy dates|date=February 2020}}
{{Infobox planet
| minorplanet = yes
| name = 941 Murray
| background = #D6D6D6
| image =
| image_size =
| caption =
| discoverer = J. Palisa
| discovery_site = Vienna Obs.
| discovered = 10 October 1920
| mpc_name = (941) Murray
| alt_names = A920 TF{{·}}1969 FF
1920 HV
| pronounced =
| named_after = Gilbert Murray
{{small|(British scholar)}}
| mp_category = {{nowrap|main-belt{{·}}{{small|(middle)}}}}
background
| epoch = 31 May 2020 (JD 2459000.5)
| uncertainty = 0
| observation_arc = 99.24 yr (36,247 d)
| aphelion = 3.3295 AU
| perihelion = 2.2358 AU
| semimajor = 2.7826 AU
| eccentricity = 0.1965
| period = 4.64 yr (1,695 d)
| mean_anomaly = 159.44°
| mean_motion = {{Deg2DMS|0.2123|sup=ms}} / day
| inclination = 6.6258°
| asc_node = 52.309°
| arg_peri = 334.93°
| mean_diameter = {{val|18.217|0.072|ul=km}}
| rotation = {{val|3.390|0.004|ul=h}}
| albedo = {{val|0.128|0.020}}
| spectral_type = {{plainlist|
}}
941 Murray (prov. designation: {{mp|A920 TF}} or {{mp|1920 HV}}) is a background asteroid, approximately {{convert|18|km|mi|abbr=off|sigfig=2|sp=us}} in diameter, located in the central region of the asteroid belt. It was discovered by Austrian astronomer Johann Palisa at the Vienna Observatory on 10 October 1920. The X-type asteroid has a short rotation period of 3.4 hours. It was named after British professor Gilbert Murray (1866–1957).
Orbit and classification
Murray 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 central asteroid belt at a distance of 2.2–3.3 AU once every 4 years and 8 months (1,695 days; semi-major axis of 2.78 AU). Its orbit has an eccentricity of 0.20 and an inclination of 7° with respect to the ecliptic. The body's observation arc begins at Vienna Observatory on 11 October 1920, the night after its official discovery observation.
Naming
This minor planet was named after Gilbert Murray (1866–1957), British classical scholar and diplomat who helped post-war Austria in 1920 through the League of Nations. The {{MoMP|941|naming}} was mentioned in The Names of the Minor Planets by Paul Herget in 1955 ({{small|H 91}}).
Physical characteristics
In the Tholen classification, Murray is a carbonaceous C-type asteroid (CX), somewhat similar to that of an X-type, while in the Bus-Binzel SMASS classification, it is an X-type asteroid.
= Rotation period =
In December 2018, a rotational lightcurve of Murray was obtained from photometric observations by the Spanish astronomer group OBAS. Lightcurve analysis gave a notably short rotation period of {{val|3.390|0.004}} hours with a brightness amplitude of {{val|0.10|0.03}} magnitude ({{small|U=2}}).
= Diameter and albedo =
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), Murray measures {{val|18.217|0.072}} kilometers in diameter and its surface has an albedo of {{val|0.128|0.020}}. The Collaborative Asteroid Lightcurve Link assumes a standard albedo for a carbonaceous asteroid of 0.057 and calculates a diameter of 27.26 kilometers based on an absolute magnitude of 11.55. The WISE team also published an alternative mean diameter {{val|17.988|0.278|u=km}} with an albedo of {{val|0.1313|0.0215}}.
References
{{reflist|30em|refs=
|type = 2020-01-07 last obs.
|title = JPL Small-Body Database Browser: 941 Murray (A920 TF)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000941
|publisher = Jet Propulsion Laboratory
|access-date = 16 February 2020}}
|title = Dictionary of Minor Planet Names
|url = https://archive.org/details/dictionaryminorp00schm
|url-access = limited
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|chapter = (941) Murray
|page = [https://archive.org/details/dictionaryminorp00schm/page/n96 83]
|date = 2007
|doi = 10.1007/978-3-540-29925-7_942
|isbn = 978-3-540-00238-3}}
|title = 941 Murray (A920 TF)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=941
|access-date = 16 February 2020}}
|display-authors = 6
|first1 = Joseph R. |last1 = Masiero
|first2 = T. |last2 = Grav
|first3 = A. K. |last3 = Mainzer
|first4 = C. R. |last4 = Nugent
|first5 = J. M. |last5 = Bauer
|first6 = R. |last6 = Stevenson
|first7 = S. |last7 = Sonnett
|date = August 2014
|title = Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos
|journal = The Astrophysical Journal
|volume = 791
|issue = 2
|page = 11
|bibcode = 2014ApJ...791..121M
|doi = 10.1088/0004-637X/791/2/121
|arxiv = 1406.6645}}
|title = LCDB Data for (941) Murray
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=941
|access-date = 16 February 2020}}
|title = Asteroid 941 Murray
|work = Small Bodies Data Ferret
|url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=941+Murray
|access-date = 16 February 2020}}
|title = Asteroid 941 Murray – Proper Elements
|publisher = AstDyS-2, Asteroids – Dynamic Site
|url = https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=941
|access-date= 16 February 2020}}
|first1 = Alfonso |last1 = Carreño
|first2 = Enrique |last2 = Arce
|first3 = Gonzalo |last3 = Fornas
|first4 = Vicente |last4 = Mas
|date = April 2019
|title = Eleven Main-belt Asteroids and One Near-Earth Asteroid Lightcurves at Asteroids Observers (OBAS) – MPPD: 2017 May - 2019 Jan
|url = http://www.minorplanet.info/MPB/issues/MPB_46-2.pdf
|journal = The Minor Planet Bulletin
|volume = 46
|issue = 2
|pages = 200–203
|bibcode = 2019MPBu...46..200C}}
}}
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://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
- {{AstDys|941}}
- {{JPL small body}}
{{Minor planets navigator |940 Kordula |number=941 |942 Romilda}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Murray}}