848 Inna

848 Inna (prov. designation: A915 RQ or 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.[1] The C-type asteroid measures approximately 33 kilometers (21 miles) in diameter, while its rotation period remains unknown. It was named after Russian astronomer Inna Nikolaevna Leman-Balanovskaya (1881–1945).[2]

848 Inna
Discovery [1]
Discovered byG. Neujmin
Discovery siteSimeiz Obs.
Discovery date5 September 1915
Designations
(848) Inna
Named after
Inna Nikolaevna Leman-Balanovskaya
(Russian astronomer)[2]
A915 RQ · 1932 WJ
1934 AC · 1934 CM1
1934 CV · 1937 RD
1959 TJ · A905 YA
1915 XS · 1905 YA
main-belt [1][3] · (outer)
Themis [4][5][6]
Orbital characteristics [3]
Epoch 31 May 2020 (JD 2459000.5)
Uncertainty parameter 0
Observation arc114.10 yr (41,676 d)
Aphelion3.6160 AU
Perihelion2.6039 AU
3.1100 AU
Eccentricity0.1627
5.48 yr (2,003 d)
56.581°
0° 10m 46.92s / day
Inclination1.0538°
207.82°
125.37°
Physical characteristics
Mean diameter
33.027±0.130 km[7]
unknown[8]
0.069±0.012[7]
C (S3OS2-TH)[9]
Cb (S3OS2-BB)[9]
11.3[1][3]

    Orbit and classification

    When applying the hierarchical clustering method to its proper orbital elements, Inna is a core member of the Themis family (602), a very large family of carbonaceous asteroids, named after 24 Themis.[4][5][6][10]: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.[3]

    Discovery

    Inna was officially discovered on 5 September 1915, by Georgian–Russian astronomer Grigory Neujmin at the Simeiz Observatory on the Crimean peninsula.[1] Four nights later, it was independently discovered by Max Wolf at Heidelberg Observatory on 9 September 1915,[2] 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 A905 YA at Heidelberg on 27 December 1905.[1]

    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.[2]

    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.[9][11] The Themis family has a "CB" overall spectral type.[10]: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.[3][11]

    Diameter and albedo

    According to the survey carried out by the NEOWISE mission of NASA's Wide-field Infrared Survey Explorer (WISE), Inna measures 33.027±0.130 kilometers in diameter and its surface has an albedo of 0.069±0.012.[7] Alternative mean-diameters published by the WISE team include (34.288±10.621 km) and (36.842±1.035 km) with corresponding albedos of (0.042±0.025) and (0.043±0.014).[11]

    References
    1. "848 Inna (A915 RQ)". Minor Planet Center. Retrieved 7 March 2020.
    2. Schmadel, Lutz D. (2007). "(848) Inna". Dictionary of Minor Planet Names. Springer Berlin Heidelberg. p. 77. doi:10.1007/978-3-540-29925-7_849. ISBN 978-3-540-00238-3.
    3. "JPL Small-Body Database Browser: 848 Inna (A915 RQ)" (2020-02-03 last obs.). Jet Propulsion Laboratory. Retrieved 7 March 2020.
    4. "Asteroid 848 Inna – Proper Elements". AstDyS-2, Asteroids – Dynamic Site. Retrieved 7 March 2020.
    5. "Asteroid 848 Inna – Nesvorny HCM Asteroid Families V3.0". Small Bodies Data Ferret. Retrieved 7 March 2020.
    6. Zappalà, V.; Bendjoya, Ph.; Cellino, A.; Farinella, P.; Froeschle, C. (1997). "Asteroid Dynamical Families". NASA Planetary Data System: EAR-A-5-DDR-FAMILY-V4.1. Retrieved 7 March 2020.} (PDS main page)
    7. Masiero, Joseph R.; Grav, T.; Mainzer, A. K.; Nugent, C. R.; Bauer, J. M.; Stevenson, R.; et al. (August 2014). "Main-belt Asteroids with WISE/NEOWISE: Near-infrared Albedos". The Astrophysical Journal. 791 (2): 11. arXiv:1406.6645. Bibcode:2014ApJ...791..121M. doi:10.1088/0004-637X/791/2/121.
    8. "LCDB Data for (848) Inna". Asteroid Lightcurve Database (LCDB). Retrieved 7 March 2020.
    9. Lazzaro, D.; Angeli, C. A.; Carvano, J. M.; Mothé-Diniz, T.; Duffard, R.; Florczak, M. (November 2004). "S3OS2: the visible spectroscopic survey of 820 asteroids" (PDF). Icarus. 172 (1): 179–220. Bibcode:2004Icar..172..179L. doi:10.1016/j.icarus.2004.06.006. Retrieved 7 March 2020.
    10. Nesvorný, D.; Broz, M.; Carruba, V. (December 2014). Identification and Dynamical Properties of Asteroid Families. Asteroids IV. pp. 297–321. arXiv:1502.01628. Bibcode:2015aste.book..297N. doi:10.2458/azu_uapress_9780816532131-ch016. ISBN 9780816532131.
    11. "Asteroid 848 Inna". Small Bodies Data Ferret. Retrieved 7 March 2020.
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