.png) Lightcurve-based 3D-model ofKaplan | |
| Discovery[1] | |
|---|---|
| Discovered by | P. F. Shajn |
| Discovery site | Simeiz Obs. |
| Discovery date | 11 September 1952 |
| Designations | |
| (1987) Kaplan | |
Named after | Samuil Kaplan[2] (Soviet astrophysicist) |
| 1952 RH | |
| main-belt · (inner) Phocaea[3][4] | |
| Orbital characteristics[1] | |
| Epoch 4 September 2017 (JD 2458000.5) | |
| Uncertainty parameter 0 | |
| Observation arc | 64.54 yr (23,573 days) |
| Aphelion | 2.9234AU |
| Perihelion | 1.8422 AU |
| 2.3828 AU | |
| Eccentricity | 0.2269 |
| 3.68yr (1,343 days) | |
| 238.97° | |
| 0° 16m 4.8s / day | |
| Inclination | 23.645° |
| 314.23° | |
| 38.176° | |
| Physical characteristics | |
| Dimensions | 11.70±2.27 km[5] 13.017±0.159 km[6] 13.52±0.39 km[7] 13.89 km(calculated)[3] 14.606±0.104 km[8] |
| 9.453±0.002h[9][a] 9.45950±0.00005 h[10] 9.46±0.01 h[11][b] 9.49±0.02 h[12] | |
| 0.2094±0.0448[8] 0.23(assumed)[3] 0.262±0.053[6] 0.278±0.017[7] 0.28±0.12[5] | |
| S(assumed)[3] | |
| 11.40[7] · 11.5[1][3][8] · 11.81[5] · 12.23±1.34[13] | |
1987 Kaplan, provisional designation1952 RH, is a stony Phocaeaasteroid from the inner regions of theasteroid belt, approximately 14 kilometers in diameter. It was discovered on 11 September 1952, by Soviet astronomerPelageya Shajn at theSimeiz Observatory on the Crimean peninsula.[14] The asteroid was named after Soviet astrophysicistSamuil Kaplan.[2]
Kaplan is a member of thePhocaea family (701),[3][4] a largefamily of stony asteroids with nearly two thousand known members.[15]: 23
It orbits the Sun in theinner main belt at a distance of 1.8–2.9 AU once every 3 years and 8 months (1,343 days). Its orbit has aneccentricity of 0.23 and aninclination of 24° with respect to theecliptic.[1] The body'sobservation arc begins with its official discovery observation at Simeiz in September 1952.[14]
Kaplan is an assumedS-type asteroid, in agreement with the overallspectral type of thePhocaea family.[15]: 23
Between 2000 and 2011, three rotationallightcurves ofKaplan were obtained from photometric observations by astronomerBrian Warner at his Palmer Divide Observatory in Colorado, United States. Lightcurve analysis gave a well-definedrotation period between 9.453 and 9.49 hours with a brightness amplitude from 0.46 to 0.65magnitude (U=3/3/3).[9][11][12][b][a]
In addition a modeled lightcurve, using photometric data from various sources, gave a concurring period of 9.45950 hours and determined two spin axis of (356.0°, −58.0°) and (233.0°, −89.0°) inecliptic coordinates.[10]
According to the surveys carried out by the JapaneseAkari satellite and theNEOWISE mission of NASA'sWide-field Infrared Survey Explorer,Kaplan measures between 11.70 and 14.606 kilometers in diameter and its surface has analbedo between 0.2094 and 0.28.[5][6][7][8]
TheCollaborative Asteroid Lightcurve Link assumes an albedo of 0.23 – derived from25 Phocaea, the family's parent body and namesake, and calculates a diameter of 13.89 kilometers based on anabsolute magnitude of 11.5.[3]
Thisminor planet was named afterSamuil Kaplan (1921–1978), Soviet astronomer and astrophysicist at Lvov University Observatory (067), Ukraine, and at theRadiophysical Research Institute in Nizhny Novgorod (formerly known as Gorky), Russia. His research included a variety of astrophysical fields, such aswhite dwarfs,interstellar matter,radiative transfer,solar radiation,pulsars andgalactic nuclei.[2]
The official naming citation was published by theMinor Planet Center on 1 June 1980 (M.P.C. 5358).[16]
