848 Inna
{{Short description|Main-belt asteroid}}
{{Use dmy dates|date=March 2020}}
{{Infobox planet
| minorplanet = yes
| name = 848 Inna
| background = #D6D6D6
| image =
| image_size =
| caption =
| discoverer = G. Neujmin
| discovery_site = Simeiz Obs.
| discovered = 5 September 1915
| mpc_name = (848) Inna
| alt_names = A915 RQ{{·}}1932 WJ
1934 AC{{·}}{{mp|1934 CM|1}}
1934 CV{{·}}1937 RD
1959 TJ{{·}}A905 YA
1915 XS{{·}}1905 YA
| pronounced =
| named_after = Inna Nikolaevna Leman-Balanovskaya
{{small|(Russian astronomer)}}
| mp_category = main-belt {{·}}{{small|(outer)}}
Themis
| epoch = 31 May 2020 (JD 2459000.5)
| uncertainty = 0
| observation_arc = 114.10 yr (41,676 d)
| aphelion = 3.6160 AU
| perihelion = 2.6039 AU
| semimajor = 3.1100 AU
| eccentricity = 0.1627
| period = 5.48 yr (2,003 d)
| mean_anomaly = 56.581°
| mean_motion = {{Deg2DMS|0.1797|sup=ms}} / day
| inclination = 1.0538°
| asc_node = 207.82°
| arg_peri = 125.37°
| mean_diameter = {{val|33.027|0.130|ul=km}}
| albedo = {{val|0.069|0.012}}
| spectral_type = C {{small|(S3OS2-TH)}}
Cb {{small|(S3OS2-BB)}}
}}
848 Inna (prov. designation: {{mp|A915 RQ}} or {{mp|1915 XS}}) is a carbonaceous Themistian asteroid from the outer regions of the asteroid belt. It was discovered on 5 September 1915, by astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. The C-type asteroid measures approximately {{convert|33|km|mi|abbr=off|sigfig=2|sp=us}} in diameter, while its rotation period remains unknown. It was named after Russian astronomer Inna Nikolaevna Leman-Balanovskaya (1881–1945).
Orbit and classification
When applying the hierarchical clustering method to its proper orbital elements, Inna is a core member of the Themis family ({{small|602}}), a very large family of carbonaceous asteroids, named after 24 Themis.{{rp|23}} It orbits the Sun in the outer main-belt at a distance of 2.6–3.6 AU once every 5 years and 6 months (2,003 days; semi-major axis of 3.11 AU). Its orbit has an eccentricity of 0.16 and an inclination of 1° with respect to the ecliptic.
Discovery
Inna was officially discovered on 5 September 1915, by Georgian–Russian astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula. Four nights later, it was independently discovered by Max Wolf at Heidelberg Observatory on 9 September 1915, which is also the beginning of the body's observation arc. The Minor Planet Center, however, only credits the first astronomer with the discovery. The asteroid was first observed by Wolf as {{mp|A905 YA}} at Heidelberg on 27 December 1905.
Naming
This minor planet was named after Inna Nikolaevna Leman-Balanovskaya (1881–1945), a Russian astronomer at the Pulkovo Observatory near St Petersburg, Russia. The naming was not mentioned in The Names of the Minor Planets by Paul Herget in 1955. Lutz Schmadel, the author of the Dictionary of Minor Planet Names learned about the origin of the minor planet's name from private communications with astronomer Nikolai Chernykh (1931–2004), who worked as an astrometricist and Solar System dynamicist at the Crimean Astrophysical Observatory.
Physical characteristics
In the Tholen-like taxonomy of the Small Solar System Objects Spectroscopic Survey (S3OS2), Inna is a common carbonaceous C-type asteroid, while in the survey's SMASS-like taxonomic variant, it is a Cb-subtype, transitioning to the somewhat brighter B-type asteroids. The Themis family has a "CB" overall spectral type.{{rp|23}} {{As of|2020}}, no rotational lightcurve of Inna has been obtained from photometric observations. The body's rotation period, pole and shape remain unknown.
= Diameter and albedo =
According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), Inna measures {{val|33.027|0.130}} kilometers in diameter and its surface has an albedo of {{val|0.069|0.012}}. Alternative mean-diameters published by the WISE team include ({{val|34.288|10.621|ul=km}}) and ({{val|36.842|1.035|u=km}}) with corresponding albedos of ({{val|0.042|0.025}}) and ({{val|0.043|0.014}}).
References
{{reflist|30em|refs=
|type = 2020-02-03 last obs.
|title = JPL Small-Body Database Browser: 848 Inna (A915 RQ)
|url = https://ssd.jpl.nasa.gov/sbdb.cgi?sstr=2000848
|publisher = Jet Propulsion Laboratory
|access-date = 7 March 2020}}
|title = Dictionary of Minor Planet Names
|last = Schmadel | first = Lutz D.
|publisher = Springer Berlin Heidelberg
|chapter = (848) Inna
|page = 77
|date = 2007
|doi = 10.1007/978-3-540-29925-7_849
|isbn = 978-3-540-00238-3}}
|title = 848 Inna (A915 RQ)
|work = Minor Planet Center
|url = https://www.minorplanetcenter.net/db_search/show_object?object_id=848
|access-date = 7 March 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 (848) Inna
|publisher = Asteroid Lightcurve Database (LCDB)
|url = http://www.minorplanet.info/PHP/generateOneAsteroidInfo.php?AstInfo=848
|access-date = 7 March 2020}}
|title = Asteroid 848 Inna
|work = Small Bodies Data Ferret
|url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=848+Inna
|access-date = 7 March 2020}}
|title = Asteroid 848 Inna – Nesvorny HCM Asteroid Families V3.0
|work = Small Bodies Data Ferret
|url = https://sbntools.psi.edu/ferret/SimpleSearch/results.action?targetName=848+Inna#Asteroid%20848%20InnaEAR-A-VARGBDET-5-NESVORNYFAM-V3.0
|access-date = 7 March 2020}}
|title = Asteroid 848 Inna – Proper Elements
|publisher = AstDyS-2, Asteroids – Dynamic Site
|url = https://newton.spacedys.com/astdys/index.php?pc=1.1.6&n=848
|access-date= 7 March 2020}}
|first1 = D. |last1 = Nesvorný
|first2 = M. |last2 = Broz
|first3 = V. |last3 = Carruba
|date = December 2014
|chapter = Identification and Dynamical Properties of Asteroid Families
|title = Asteroids IV
|pages = 297–321
|bibcode = 2015aste.book..297N
|doi = 10.2458/azu_uapress_9780816532131-ch016
|arxiv = 1502.01628
|isbn = 9780816532131
}}
|last1 = Zappalà |first1 = V.
|last2 = Bendjoya |first2 = Ph.
|last3 = Cellino |first3 = A.
|last4 = Farinella |first4 = P.
|last5 = Froeschle |first5 = C.
|date = 1997
|title = Asteroid Dynamical Families
|url = https://sbnarchive.psi.edu/pds3/non_mission/EAR_A_5_DDR_FAMILY_V4_1/data/family.tab
|journal = NASA Planetary Data System
|pages = EAR-A-5-DDR-FAMILY-V4.1
|access-date = 7 March 2020}}} ([https://sbn.psi.edu/pds/resource/family.html PDS main page])
|first1 = D. |last1 = Lazzaro
|first2 = C. A. |last2 = Angeli
|first3 = J. M. |last3 = Carvano
|first4 = T. |last4 = Mothé-Diniz
|first5 = R. |last5 = Duffard
|first6 = M. |last6 = Florczak
|date = November 2004
|title = S3OS2: the visible spectroscopic survey of 820 asteroids
|url = http://sirrah.troja.mff.cuni.cz/yarko-site/tmp/eos/NEW/spectral_type_figure/s3os2.pdf
|journal = Icarus
|volume = 172
|issue = 1
|pages = 179–220
|bibcode = 2004Icar..172..179L
|doi = 10.1016/j.icarus.2004.06.006
|access-date= 7 March 2020}}
}}
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://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|848}}
- {{JPL small body}}
{{Minor planets navigator |847 Agnia |number=848 |849 Ara}}
{{Small Solar System bodies}}
{{Authority control}}
{{DEFAULTSORT:Inna}}