| Discovery[1] | |
|---|---|
| Discovered by | G. Neujmin |
| Discovery site | Simeiz Obs. |
| Discovery date | 5 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 arc | 114.10yr (41,676 d) |
| Aphelion | 3.6160AU |
| Perihelion | 2.6039 AU |
| 3.1100 AU | |
| Eccentricity | 0.1627 |
| 5.48 yr (2,003 d) | |
| 56.581° | |
| 0° 10m 46.92s / day | |
| Inclination | 1.0538° |
| 207.82° | |
| 125.37° | |
| Physical characteristics | |
| 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] | |
848 Inna (prov. designation:A915 RQor1915 XS) is a carbonaceousThemistian asteroid from the outer regions of theasteroid belt. It was discovered on 5 September 1915, by astronomerGrigory Neujmin at theSimeiz Observatory on the Crimean peninsula.[1] TheC-type asteroid measures approximately 33 kilometers (21 miles) in diameter, while itsrotation period remains unknown. It was named after Russian astronomer Inna Nikolaevna Leman-Balanovskaya (1881–1945).[2]
When applying thehierarchical clustering method to itsproper orbital elements,Inna is a core member of theThemis family (602), a very largefamily of carbonaceous asteroids, named after24 Themis.[4][5][6][10]: 23 It orbits the Sun in theouter 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 aneccentricity of 0.16 and aninclination of 1° with respect to theecliptic.[3]
Inna was officially discovered on 5 September 1915, by Georgian–Russian astronomerGrigory Neujmin at theSimeiz Observatory on the Crimean peninsula.[1] Four nights later, it was independently discovered byMax Wolf atHeidelberg Observatory on 9 September 1915,[2] which is also the beginning of the body'sobservation arc. TheMinor Planet Center, however, only credits the first astronomer with the discovery. The asteroid was first observed by Wolf asA905 YA at Heidelberg on 27 December 1905.[1]
Thisminor planet was named after Inna Nikolaevna Leman-Balanovskaya (1881–1945), a Russian astronomer at thePulkovo Observatory near St Petersburg, Russia. The naming was not mentioned inThe Names of the Minor Planets byPaul Herget in 1955.Lutz Schmadel, the author of theDictionary of Minor Planet Names learned about the origin of the minor planet's name from private communications with astronomerNikolai Chernykh (1931–2004), who worked as anastrometricist and Solar System dynamicist at theCrimean Astrophysical Observatory.[2]
In the Tholen-like taxonomy of theSmall Solar System Objects Spectroscopic Survey (S3OS2),Inna is a common carbonaceousC-type asteroid, while in the survey's SMASS-like taxonomic variant, it is a Cb-subtype, transitioning to the somewhat brighterB-type asteroids.[9][11] The Themis family has a "CB" overallspectral type.[10]: 23 As of 2020[update], no rotationallightcurve ofInna has been obtained fromphotometric observations. The body'srotation period,pole and shape remain unknown.[3][11]
According to the survey carried out by theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer (WISE),Inna measures33.027±0.130 kilometers in diameter and its surface has analbedo of0.069±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]
