907 Rhoda

Rhoda 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 2.3–3.3 AU once every 4 years and 8 months (1,712 days; semi-major axis of 2.8 AU). Its orbit has an eccentricity of 0.16 and an inclination of 20° with respect to the ecliptic. The body's observation arc begins with its first observation as {{mp|A901 BA}} ({{mp|1901 BA}}) at the Heidelberg-Königstuhl State Observatory on 18 January 1901, where it was officially discovered almost 18 years later on 12 November 1918.

This minor planet was named after Rhoda Barnard (née Calvert), wife of the American astronomer Edward Emerson Barnard (1857–1923), who was himself honored with the asteroid 819 Barnardiana. The official naming was published in the journal Astronomische Nachrichten in 1922 (AN 215, 471). The {{MoMP|907|naming}} was also mentioned in The Names of the Minor Planets by Paul Herget in 1955 ({{small|H 88}}).

In the Tholen classification, Rhoda is a common, carbonaceous C-type asteroid, while in the Bus–Binzel SMASS classification it is a Xk-subtype, which transitions from the X-type to the uncommon K-type asteroids. In the Barucci-taxonomy, which classified a total of 438 asteroids in 1987, Rhoda is a C0-type.

In April 2004, a rotational lightcurve of Rhoda was obtained from photometric observations by Brian Warner at the Palmer Divide Observatory {{Obscode|716}} in Colorado. Lightcurve analysis gave a rotation period of {{val|22.44|0.02}} hours with a low brightness variation of {{val|0.16|0.02}} magnitude, indicative of a non-elongated, spherical shape ({{small|U=3−}}).{{efn|name=lightcurve-plot-Warner}} Other period determinations were made by Marciniak as well as by Raphaël Nicollerat and Raoul Behrend, giving a low-amplitude lightcurve with a period of {{val|22.46|0.01}} and {{val|22.4|0.5}} hours, respectively ({{small|U=2/1}}).

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), Rhoda measures ({{val|62.73|1.7}}), ({{val|75.22|0.83}}) and ({{val|82.660|0.340}}) kilometers in diameter and its surface has an albedo of ({{val|0.0560|0.003}}), ({{val|0.040|0.001}}) and ({{val|0.032|0.005}}), respectively. The Collaborative Asteroid Lightcurve Link adopts the results obtained by IRAS, that is, an albedo of 0.0560 and calculates a diameter of 62.73 kilometers based on an absolute magnitude of 10.74. Alternative mean-diameter measurements published by the WISE team include in ascending order ({{val|67.246|26.594|u=km}}), ({{val|84.062|30.075|u=km}}), ({{val|91.045|2.093|u=km}}) and ({{val|95.22|22.26|u=km}}) and albedos of ({{val|0.0266|0.0058}}), ({{val|0.03|0.02}}), ({{val|0.031|0.015}}) and ({{val|0.044|0.035}}). An asteroid occultation, observed on 23 March 2009, gave a best-fit ellipse dimension of 63.0 × 63.0 kilometers. These timed observations are taken when the asteroid passes in front of a distant star.

{{notelist|refs=

{{efn|name=lightcurve-plot-Warner|1=[http://www.minorplanetobserver.com/pdolc/A907_2004.HTM Lightcurve plot of (907) Rhoda], Palmer Divide Observatory, B. D. Warner (2004). Rotation period {{val|22.44|0.02}} hours with a brightness amplitude of {{val|0.16|0.02}} mag. Quality code is 3. Summary figures at the [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=907 LCDB].}}

}}

{{reflist|30em|refs=

{{cite web

|type = 2019-09-19 last obs.

|title = JPL Small-Body Database Browser: 907 Rhoda (A918 VA)

|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000907

|publisher = Jet Propulsion Laboratory

|access-date = 24 February 2020}}

{{Cite arXiv |last1=Choukroun |first1=A. |last2=Marciniak |first2=A. |last3=Ďurech |first3=J. |last4=Perła |first4=J. |last5=Ogłoza |first5=W. |last6=Szakats |first6=R. |last7=Molnar |first7=L. |last8=Pal |first8=A. |last9=Monteiro |first9=F. |title=Asteroid sizes determined with thermophysical model and stellar occultations |date=2025 |class=astro-ph.EP |eprint=2505.09437 }}

{{cite book

|title = Dictionary of Minor Planet Names

|last = Schmadel | first = Lutz D.

|publisher = Springer Berlin Heidelberg

|chapter = (907) Rhoda

|page = 81

|date = 2007

|doi = 10.1007/978-3-540-29925-7_908

|isbn = 978-3-540-00238-3}}

{{cite web

|title = 907 Rhoda (A918 VA)

|work = Minor Planet Center

|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=907

|access-date = 24 February 2020}}

{{cite web

|title = Asteroids and comets rotation curves – (907) Rhoda

|last = Behrend |first = Raoul

|publisher = Geneva Observatory

|url = http://obswww.unige.ch/~behrend/page3cou.html#000907

|access-date = 24 February 2020}}

{{cite journal

|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}}

{{cite journal

|display-authors = 6

|first1 = Fumihiko |last1 = Usui

|first2 = Daisuke |last2 = Kuroda

|first3 = Thomas G. |last3 = Müller

|first4 = Sunao |last4 = Hasegawa

|first5 = Masateru |last5 = Ishiguro

|first6 = Takafumi |last6 = Ootsubo

|first7 = Daisuke |last7 = Ishihara

|first8 = Hirokazu |last8 = Kataza

|first9 = Satoshi |last9 = Takita

|first10 = Shinki |last10 = Oyabu

|first11 = Munetaka |last11 = Ueno

|first12 = Hideo |last12 = Matsuhara

|first13 = Takashi |last13 = Onaka

|date = October 2011

|title = Asteroid Catalog Using Akari: AKARI/IRC Mid-Infrared Asteroid Survey

|journal = Publications of the Astronomical Society of Japan

|volume = 63

|issue = 5

|pages = 1117–1138

|bibcode = 2011PASJ...63.1117U

|doi = 10.1093/pasj/63.5.1117

|doi-access=

}} ([http://vizier.cfa.harvard.edu/viz-bin/VizieR-5?-source=J/PASJ/63/1117/acua_v1&Num=907 online], [https://core.ac.uk/download/pdf/43545172.pdf AcuA catalog p. 153])

{{cite journal

|first1 = E. F. |last1 = Tedesco

|first2 = P. V. |last2 = Noah

|first3 = M. |last3 = Noah

|first4 = S. D. |last4 = Price

|date = October 2004

|title = IRAS Minor Planet Survey V6.0

|url = https://sbnarchive.psi.edu/pds3/iras/IRAS_A_FPA_3_RDR_IMPS_V6_0/data/diamalb.tab

|journal = NASA Planetary Data System

|volume = 12

|pages = IRAS-A-FPA-3-RDR-IMPS-V6.0

|bibcode = 2004PDSS...12.....T

|access-date = 24 February 2020}}

{{cite web

|title = LCDB Data for (907) Rhoda

|publisher = Asteroid Lightcurve Database (LCDB)

|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=907

|access-date = 24 February 2020}}

{{cite journal

|last1 = Warner |first1 = Brian D.

|date = December 2004

|title = Lightcurve analysis for numbered asteroids 863, 903, 907, 928, 977, 1386 2841, and 75747

|journal = Minor Planet Bulletin

|url = http://www.minorplanet.info/MPB/issues/MPB_31-4.pdf

|volume = 31

|issue = 4

|pages = 85–88

|bibcode = 2004MPBu...31...85W

|issn = 1052-8091}}

{{cite web

|title = Asteroid 907 Rhoda

|work = Small Bodies Data Ferret

|url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=907+Rhoda

|access-date = 24 February 2020}}

{{cite web

|title = Asteroid 907 Rhoda – Proper Elements

|publisher = AstDyS-2, Asteroids – Dynamic Site

|url = https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=907

|access-date= 24 February 2020}}

}}

• [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|907}}
• {{JPL small body}}

{{Minor planets navigator |906 Repsolda |number=907 |908 Buda}}

{{Small Solar System bodies}}

{{Authority control}}

{{DEFAULTSORT:Rhoda}}

000907

Category:Discoveries by Max Wolf

Category:Named minor planets

000907

000907

19181112