32532 Thereus
{{Use dmy dates|date=August 2021}}
{{Infobox planet
| minorplanet = yes
| name = 32532 Thereus
| symbol = 24px (astrological)
| background = #C7FF8F
| image = Орбита астероида 32532.png
| image_size =
| caption =
| discoverer = NEAT
| discovery_site = Palomar Obs.
| discovered = 9 August 2001
| mpc_name = (32532) Thereus
| alt_names = {{mp|2001 PT|13}}{{·}}{{mp|1995 MM|6}}
{{mp|1999 NE|2}}
| pronounced = {{IPAc-en|θ|ɪ|'|r|iː|ə|s}}
| named_after = θήρειος βία thēreios bia
| mp_category = centaur {{·}}distant
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 1
| observation_arc = 21.57 yr (7,879 days)
| aphelion = 12.745 AU
| perihelion = 8.5345 AU
| semimajor = 10.640 AU
| eccentricity = 0.1979
| period = 34.70 yr (12,676 days)
| mean_anomaly = 192.91°
| mean_motion = {{Deg2DMS|0.0284|sup=ms}} / day
| inclination = 20.353°
| asc_node = 205.33°
| arg_peri = 86.322°
| mean_diameter = {{val|62|3|ul=km}}
77.19 km {{small|(derived)}}
{{val|80|5}} km
{{val|86.500|1.900}} km
| rotation = {{val|8.30|ul=h}}
{{val|8.3091}} h
{{val|8.335}} h
{{val|8.338|0.002}} h
{{val|8.3386|0.0006}} h
| albedo = 0.057 {{small|(assumed)}}
{{val|0.059|0.013}}
{{val|0.083|0.016}}
{{val|0.0975|0.0125}}
| spectral_type = BR
B–V = {{val|0.770|0.020}}
B–V = {{val|0.810|0.050}}
B–V = {{val|0.763|0.072}}
V–R = {{val|0.490|0.010}}
V–R = {{val|0.501|0.016}}
V–I = {{val|0.940|0.010}}
V–I = {{val|0.900|0.130}}
V–I = {{val|0.917|0.035}}
| abs_magnitude = 9.1{{·}}9.29{{·}}9.32{{·}}9.36{{·}}{{val|9.365|0.038}} {{small|(R)}}{{·}}{{val|9.40|0.16}}{{·}}{{val|9.42|0.01}}
}}
32532 Thereus ({{IPAc-en|θ|ɪ|'|r|iː|ə|s}}; provisional designation {{mp|2001 PT|13}}) is a centaur from the outer Solar System, approximately {{convert|80|km|mi|abbr=off|sigfig=2|sp=us}} in diameter. It was discovered on 9 August 2001, by astronomers of the Near-Earth Asteroid Tracking program at the Palomar Observatory in California, United States. This minor planet was named for the phrase thēreios bia 'beastly strength', used to describe centaurs in Greek mythology.{{LSJ|qh%2Freios|θήρειος|ref}}
Orbit and classification
Thereus orbits the Sun at a distance of 8.5–12.7 AU once every 34 years and 8 months (12,676 days). Its orbit has an eccentricity of 0.20 and an inclination of 20° with respect to the ecliptic.
The body's observation arc begins with a precovery taken by Spacewatch at Kitt Peak Observatory in June 1995, more than 6 years prior to its official discovery observation by NEAT at Palomar.
Naming
This minor planet was named after Thereus, a centaur from Greek mythology. He is described as a hunter who captured bears and carried them home, alive and struggling. The official naming citation was published by the Minor Planet Center on 14 June 2003 ({{small|M.P.C. 49102}}).
Physical characteristics
= Rotation period =
Since the early 2000s, several rotational lightcurves of Thereus were obtained from photometric observations with a period between 8.30 and 8.3386 hours. Analysis of the consolidated, best-rated lightcurve gave a rotation period of 8.335 hours and a brightness amplitude of 0.38 magnitude ({{small|U=3}}).
= Diameter and albedo =
According to observations made by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, ESA's Herschel Space Observatory with its PACS instrument, and the Spitzer Space Telescope, Thereus measures between 62 and 86.5 kilometers in diameter and its surface has an albedo between 0.059 and 0.0975.
The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous minor planets of 0.057 and derives a diameter of 77.19 kilometers based on an absolute magnitude of 9.29.
See also
- {{Section link|List of centaurs (small Solar System bodies)|32532}}
References
{{reflist|30em|refs=
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|title = JPL Small-Body Database Browser: 32532 Thereus (2001 PT13)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2032532
|publisher = Jet Propulsion Laboratory
|access-date= 21 September 2017}}
|title = Dictionary of Minor Planet Names – Addendum to Fifth Edition: 2003–2005
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|chapter = (32532) Thereus [10.6, 0.20, 20.4]
|page = 199
|date = 2006
|isbn = 978-3-540-34361-5
|doi = 10.1007/978-3-540-34361-5_2336}}
|title = 32532 Thereus (2001 PT13)
|work = Minor Planet Center
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|access-date= 21 September 2017}}
|title = MPC/MPO/MPS Archive
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|access-date= 21 September 2017}}
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}}
External links
- [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
- [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Observatoire de Genève, Raoul Behrend
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs030001.html Discovery Circumstances: Numbered Minor Planets (30001)-(35000)] – Minor Planet Center
- {{AstDys|32532}}
- {{JPL small body}}
{{Minor planets navigator |32531 Ulrikababiaková |number=32532 |32533 Tranpham}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Thereus}}