1121 Natascha
{{Short description|Main-belt asteroid}}
{{Use dmy dates|date=October 2019}}
{{Infobox planet
| minorplanet = yes
| name = 1121 Natascha
| background = #D6D6D6
| image = 001121-asteroid shape model (1121) Natascha.png
| image_scale =
| caption = Shape model of Natascha from its lightcurve
| discoverer = P. Shajn
| discovery_site = Simeiz Obs.
| discovered = 11 September 1928
| mpc_name = (1121) Natascha
| alt_names = 1928 RZ{{·}}A918 EK
| pronounced =
| named_after = Natasha Tichomirova
{{small|(daughter of G. Neujmin)}}
| mp_category = main-belt{{·}}{{small|(inner)}}
background{{·}}Astraea
| epoch = 4 September 2017 (JD 2458000.5)
| uncertainty = 0
| observation_arc = 87.68 yr (32,024 days)
| aphelion = 2.9500 AU
| perihelion = 2.1428 AU
| semimajor = 2.5464 AU
| eccentricity = 0.1585
| period = 4.06 yr (1,484 days)
| mean_anomaly = 285.31°
| mean_motion = {{Deg2DMS|0.2426|sup=ms}} / day
| inclination = 6.1646°
| asc_node = 357.91°
| arg_peri = 50.379°
| mean_diameter = {{val|12.859|0.443}} km
{{val|14.52|0.54}} km
14.89 km {{small|(calculated)}}
| rotation = {{val|13.197|0.003|ul=h}}
| pole_ecliptic_lat= {{plainlist|
| albedo = {{val|0.160|0.013}}
0.20 {{small|(assumed)}}
{{val|0.294|0.023}}
| spectral_type = S {{small|(assumed)}}
| abs_magnitude = 11.40{{·}}11.5{{·}}11.80
}}
1121 Natascha (prov. designation: {{mp|1928 RZ}}) is a background asteroid from the central regions of the asteroid belt. It was discovered on 11 September 1928, by Soviet astronomer Pelageya Shajn at the Simeiz Observatory on the Crimean peninsula. The presumed S-type asteroid has rotation period of 13.2 hours and measures approximately {{convert|14|km|mi|abbr=off|sp=us}} in diameter. It was named for Natasha Tichomirova, daughter of astronomer Grigory Neujmin.
Orbit and classification
Natascha is a non-family asteroid from the main belt's background population. Conversely, the asteroid is also considered a core member of the disputed Astraea family. It orbits the Sun in the central main-belt at a distance of 2.1–3.0 AU once every 4 years and 1 month (1,484 days; semi-major axis of 2.55 AU). Its orbit has an eccentricity of 0.16 and an inclination of 6° with respect to the ecliptic. The asteroid was first observed as {{mp|A918 EK}} at Simeiz Observatory in March 1918. The body's observation arc begins at Heidelberg Observatory in February 1930, or 17 months after its official discovery observation at Simeiz.
Naming
This minor planet was named as a birthday present for Soviet hydrogeologist Natasha (Natalia) Tichomirova, daughter of Grigory Neujmin, who was an astronomer at the discovering Simeiz Observatory and prolific discoverer of minor planets himself ({{small|AN 240;409}}). The author of the Dictionary of Minor Planet Names, Lutz Schmadel, learned about the naming circumstances from Crimean astronomers N. Solovaya, Nataliya Sergeevna Samoilova-Yakhontova and Nikolai Chernykh (also see {{MoMP|1653|1653 Yakhontovia}} and {{MoMP|2325|2325 Chernykh}}).
Physical characteristics
Natascha is an assumed, stony S-type asteroid.
= Rotation period and poles =
In May 2012, a rotational lightcurve of Natascha was obtained from photometric observations by astronomers at the Oakley Southern Sky Observatory in Australia. Lightcurve analysis gave a well-defined rotation period of 13.197 hours with a brightness variation of 0.51 magnitude ({{small|U=3}}). A high brightness amplitude typically indicates a non-spherical shape.
In 2016, a modeled lightcurve was published using photometric data from the Lowell Photometric Database. Lightcurve inversion gave a concurring period of {{val|13.19717|0.00001}} hours, as well as two spin axes of (16.0°, 59.0°) and (209.0°, 50.0°) in ecliptic coordinates (λ, β).
= Diameter and albedo =
According to the surveys carried out by the Japanese Akari satellite and the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer, Natascha measures between 12.859 and 14.52 kilometers in diameter and its surface has an albedo between 0.160 and 0.294.
The Collaborative Asteroid Lightcurve Link assumes a standard albedo for stony asteroids of 0.20 and calculates a diameter of 14.89 kilometers based on an absolute magnitude of 11.5.
References
{{reflist|30em|refs=
|type = 2017-10-29 last obs.
|title = JPL Small-Body Database Browser: 1121 Natascha (1928 RZ)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2001121
|publisher = Jet Propulsion Laboratory
|accessdate = 25 January 2018}}
|title = Dictionary of Minor Planet Names – (1121) Natascha
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|page = 95
|date = 2007
|isbn = 978-3-540-00238-3
|doi = 10.1007/978-3-540-29925-7_1122 }}
|title = 1121 Natascha (1928 RZ)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=1121
|accessdate = 25 January 2018}}
|title = Small Bodies Data Ferret
|work = Nesvorny HCM Asteroid Families V3.0
|url = https://sbntools.psi.edu/ferret/PropertySearch/familyForm.action
|accessdate = 25 January 2018
|archive-url = https://web.archive.org/web/20170802210005/http://sbntools.psi.edu/ferret/PropertySearch/familyForm.action
|archive-date = 2 August 2017
|url-status = dead
}}
|title = Asteroid 1121 Natascha – Proper Elements
|publisher = AstDyS-2, Asteroids – Dynamic Site
|url = https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=1121
|access-date= 28 October 2019}}
|title = LCDB Data for (1121) Natascha
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=1121%7CNatascha
|accessdate = 25 January 2018}}
|display-authors = 6
|first1 = Joseph R. |last1 = Masiero
|first2 = A. K. |last2 = Mainzer
|first3 = T. |last3 = Grav
|first4 = J. M. |last4 = Bauer
|first5 = R. M. |last5 = Cutri
|first6 = C. |last6 = Nugent
|first7 = M. S. |last7 = Cabrera
|date = November 2012
|title = Preliminary Analysis of WISE/NEOWISE 3-Band Cryogenic and Post-cryogenic Observations of Main Belt Asteroids
|journal = The Astrophysical Journal Letters
|volume = 759
|issue = 1
|page = 5
|bibcode = 2012ApJ...759L...8M
|doi = 10.1088/2041-8205/759/1/L8
|arxiv = 1209.5794
}}
|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= free
}} ([http://vizier.cfa.harvard.edu/viz-bin/VizieR-5?-source=J/PASJ/63/1117/acua_v1&Num=1121 online], [https://core.ac.uk/download/pdf/43545172.pdf AcuA catalog p. 153])
|first1 = Patricia |last1 = Moravec
|first2 = Alla |last2 = Letfullina
|first3 = Richard |last3 = Ditteon
|date = January 2013
|title = Asteroid Lightcurve Analysis at the Oakley Observatories: 2012 May - June
|journal = The Minor Planet Bulletin
|volume = 40
|issue = 1
|pages = 17–20
|issn = 1052-8091
|bibcode = 2013MPBu...40...17M
}}
|first1 = J. |last1 = Durech
|first2 = J. |last2 = Hanus
|first3 = D. |last3 = Oszkiewicz
|first4 = R. |last4 = Vanco
|date = March 2016
|title = Asteroid models from the Lowell photometric database
|journal = Astronomy and Astrophysics
|volume = 587
|page = 6
|bibcode = 2016A&A...587A..48D
|doi = 10.1051/0004-6361/201527573
|arxiv = 1601.02909}}
}}
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=PA94 Dictionary of Minor Planet Names], (1121) Natascha, Google books
- [http://obswww.unige.ch/~behrend/page_cou.html Asteroids and comets rotation curves, CdR] – Geneva Observatory, Raoul Behrend
- [https://www.minorplanetcenter.net/iau/lists/NumberedMPs000001.html Discovery Circumstances: Numbered Minor Planets (1)-(5000)] – Minor Planet Center
- {{AstDys|1121}}
- {{JPL small body}}
{{Minor planets navigator |1120 Cannonia |number=1121 |1122 Neith}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Natascha}}