Discovery [1] | |
---|---|
Discovered by | L. G. Karachkina |
Discovery site | Crimean Astrophysical Obs. |
Discovery date | 6 October 1986 |
Designations | |
(4997) Ksana | |
Named after | Kseniya A. Nessler (Russian chemist)[2] |
1986 TM | |
main-belt · (outer) [3] Pallas [4] | |
Orbital characteristics [1] | |
Epoch 4 September 2017 (JD 2458000.5) | |
Uncertainty parameter 0 | |
Observation arc | 30.57 yr (11,165 days) |
Aphelion | 3.8162 AU |
Perihelion | 1.9285 AU |
2.8723 AU | |
Eccentricity | 0.3286 |
4.87 yr (1,778 days) | |
97.646° | |
0° 12m 9s / day | |
Inclination | 32.828° |
10.897° | |
57.447° | |
Physical characteristics | |
Dimensions | 7.36±2.79 km[5] 9.860±0.160 km[6][7] 9.97±0.33 km[8] 10±1 km[9] 14.64 km (calculated)[3] |
3.4342±0.0003 h[10] | |
0.057 (assumed)[3] 0.16±0.03[9] 0.271±0.206[5] 0.312±0.022[8] 0.3157±0.0548[7] 0.316±0.055[6] | |
SMASS = B [1] · B [3] | |
11.9[3][7][8] · 12.70[5][9] · 12.79±0.30[11] · 13.0[1] | |
4997 Ksana, provisional designation 1986 TM, is a carbonaceous Palladian asteroid from the outer region of the asteroid belt, approximately 10 kilometers in diameter. It was discovered on 6 October 1986, by Russian astronomer Lyudmila Karachkina at Crimean Astrophysical Observatory on the Crimean peninsula.[12] The asteroid was named for Russian chemist Kseniya Nessler.[2]
Ksana is a small member of the Pallas family (801), a small asteroid family of carbonaceous B-type asteroids.[4][13]: 23 It orbits the Sun in the outer main-belt at a distance of 1.9–3.8 AU once every 4 years and 10 months (1,778 days). Its orbit has an eccentricity of 0.33 and an inclination of 33° with respect to the ecliptic.[1] As no precoveries were taken, the asteroid's observation arc begins with its discovery observation in 1986.[12]
On the SMASS taxonomic scheme, Ksana is a B-type asteroid, which are primitive, volatile-rich asteroids.[1] This also agrees with the overall spectral type of the Pallas family.[13]: 23
According to the surveys carried out by the Japanese Akari satellite and NASA's Wide-field Infrared Survey Explorer with its subsequent NEOWISE mission, Ksana measures between 7.36 and 10±1 kilometers in diameter and its surface has an albedo between 0.16 and 0.316.[5][6][7][8][9]
The Collaborative Asteroid Lightcurve Link assumes a standard albedo for carbonaceous asteroids of 0.057 and calculates a larger diameter of 14.64 kilometers with an absolute magnitude of 12.9.[3]
In February 2007, a rotational lightcurve of Ksana was obtained from photometric observations by Italian astronomer Federico Manzini at the SAS observatory in Novara, Italy. It gave it a rotation period of 3.4342±0.0003 hours with a brightness variation of 0.21 in magnitude (U=2).[10]
This minor planet was named by the discoverer for his friend, the Russian chemist Kseniya Andreevna Nessler, who has been an advocate against environmental pollution. The asteroid's name "Ksana" is a variation of Kseniya (Ксения), the equivalent to the romanized Xenia.[2] The official naming citation was published by the Minor Planet Center on 1 September 1993 (M.P.C. 22505 and 22609).[14]