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Discovery and designation
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| Discovered by | E. W. Elst |
| Discovery site | European Southern Observatory |
| Discovery date | January 22, 1987 |
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Designations
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| MPC designation | 11842 |
| Alternate name(s) | 1987 BR1 |
| Epoch May 14, 2008 | |
| Ap | 2.4627886 |
| Peri | 2.0374870 |
| Eccentricity | 0.0945057 |
| Orbital period | 1232.8552640 |
| Mean anomaly | 143.10749 |
| Inclination | 3.69167 |
| Longitude of ascending node | 272.91900 |
| Argument of peri | 171.92200 |
| Absolute magnitude (H) | 14.1 |
11842 Kap'bos (1987 BR1) is a main-belt asteroid discovered on January 22, 1987 by E. W. Elst at the European Southern Observatory. Kapbos (Kapellenbos) is a small village, east of the city of Antwerp. Recently there has been established a small observatory for astrometry of minor planets. It has been named appropriately after the famous orbit calculator of asteroids and comets Brian G. Marsden (1937-2010)
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