7505 Furusho

Furusho is a member of the Mars-crossing asteroids, a dynamically unstable group between the main belt and the near-Earth populations, crossing the orbit of Mars at 1.66 AU. It orbits the Sun at a distance of 1.6–3.6 AU once every 4 years and 3 months (1,563 days; semi-major axis of 2.64 AU). Its orbit has a high eccentricity of 0.38 and an inclination of 6° with respect to the ecliptic. The body's observation arc begins with its first observation as {{mp|1940 WC}} at the Crimean Simeiz Observatory in November 1940, or more than 56 years prior to its official discovery observation by Takao Kobayashi at Ōizumi in January 1997.

This minor planet was named after Japanese astronomer Reiko Furusho (born 1970). Her research includes cometary physics, in particular the measurement of polarized light, caused by scattering on comet dust. Furusho also works in the education and popularization of astronomy. The official {{MoMP|7505|naming citation}} was published by the Minor Planet Center on 1 May 2003 ({{small|M.P.C. 48388}}).

Furusho is an assumed S-type asteroid.

In November 2017, a rotational lightcurve of Furusho was obtained from photometric observations by Daniel Klinglesmith at Etscorn Observatory {{Obscode|719}} in Socorro, New Mexico. Lightcurve analysis gave a well-defined rotation period of {{val|4.139|0.001}} hours with a high brightness variation of 0.63 magnitude ({{small|U=3}}).

The result agrees with previous period determinations by Hungarian astronomers at Konkoly Observatory in autumn 2001 ({{small|U=3}}), and with observations by astronomers at the Palomar Transient Factory in California in May 2011 ({{small|U=3}}). Robert Stephens at Santana Observatory {{Obscode|646}} and Brian Warner at the Palmer Divide Station {{Obscode|U82}} also determined an identical period in November 2001 and December 2013, respectively ({{small|U=3/3}}). All observations showed a classically shaped bimodal lightcurve with a high brightness amplitude between 0.52 and 0.75 magnitude, which is indicative of an elongated, non-spherical shape.{{efn|name=lightcurve-plot-Warner}}

According to the survey carried out by the Infrared Astronomical Satellite IRAS, Furusho measures 9.07 kilometers in diameter and its surface has an albedo of 0.37. In 2017, a study dedicated to Mars-crossing asteroids by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer determined a diameter of 10.04 kilometers with an albedo of 0.21. The Collaborative Asteroid Lightcurve Link derives an albedo of 0.29 and a diameter of 8.9 kilometers based on an absolute magnitude of 12.20.

With a diameter of 10 kilometers, Furusho is a typical "sizable" Mars-crosser (5–15 km) of which two dozens or so are known. These include 3581 Alvarez (13.7 km) 1065 Amundsenia (9.8 km), 1139 Atami (9.4 km), 3737 Beckman (14.4 km), 1474 Beira (15.5 km), 5682 Beresford (7.3 km), 7369 Gavrilin (5.5 km), 1011 Laodamia (7.4 km), 6170 Levasseur (5.7 km), 1727 Mette (5.4 km), 1131 Porzia (7.1 km), 985 Rosina (8.2 km), 1235 Schorria (5.6 km), 1310 Villigera (15.2 km), and 1468 Zomba (7 km), which are themselves smaller than the largest members of this dynamical group, namely, 132 Aethra, 323 Brucia (former Mars-crosser), 1508 Kemi, 2204 Lyyli and 512 Taurinensis, all larger than 20 kilometers.

{{notelist|refs=

{{efn|name=lightcurve-plot-Warner|1=[http://www.planetarysciences.org/plots/BDW/7505_FURUSHO_2013-12-21.PNG Lightcurve plot of (7505) Furusho], by Brian Warner rotation period {{val|4.140|0.005}} hours with a brightness amplitude of {{val|0.52|0.02}} mag. Quality code is 3. Summary figures at the [http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=7505%7CFurusho LCDB].}}

}}

{{reflist|30em|refs=

{{cite web

|type = 2018-04-12 last obs.

|title = JPL Small-Body Database Browser: 7505 Furusho (1997 AM2)

|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2007505

|publisher = Jet Propulsion Laboratory

|access-date = 14 November 2018}}

{{cite web

|title = 7505 Furusho (1997 AM2)

|work = Minor Planet Center

|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=7505

|access-date = 14 November 2018}}

{{cite web

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|work = Minor Planet Center

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|access-date = 14 November 2018}}

{{cite web

|title = LCDB Data for (7505) Furusho

|publisher = Asteroid Lightcurve Database (LCDB)

|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=7505%7CFurusho

|access-date = 14 November 2018}}

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|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

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}}

{{Cite journal

|author = Stephens, R. D.

|date = June 2001

|title = Rotational Periods and Lightcurves of 1277 Dolores, 666 Desdemona and (7505) 1997 AM2

|journal = The Minor Planet Bulletin

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}}

{{cite journal

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{{Cite journal

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|date = April 2014

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{{Cite journal

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|first2 = Sebastian |last2 = Hendrickx

|date = April 2018

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{{cite journal

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|date = September 2015

|title = Asteroid Light Curves from the Palomar Transient Factory Survey: Rotation Periods and Phase Functions from Sparse Photometry

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}}

• [https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=7505+Furusho Asteroid 7505 Furusho], Small Bodies Data Ferret
• [http://www.minorplanet.info/PHP/lcdbsummaryquery.php Asteroid Lightcurve Database (LCDB)], query form ([http://www.minorplanet.info/lightcurvedatabase.html info] {{Webarchive|url=https://web.archive.org/web/20171216050541/http://www.minorplanet.info/lightcurvedatabase.html |date=16 December 2017 }})
• [https://books.google.com/books?id=aeAg1X7afOoC&pg Dictionary of Minor Planet Names], Google books
• [https://www.minorplanetcenter.net/iau/lists/NumberedMPs005001.html Discovery Circumstances: Numbered Minor Planets (5001)-(10000)] – Minor Planet Center
• {{AstDys|7505}}
• {{JPL small body}}

{{Minor planets navigator |7504 Kawakita |number=7505 |7506 Lub}}

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007505

Category:Discoveries by Takao Kobayashi

Category:Named minor planets

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