If you have this string from an old bibliography or personal notebook, the next step is to search ApJ 1987 for papers containing “114” along with “arcsec” or “offset” – and look for tables labeled with dashes and numbers. Do you have additional context (author names, object type, or observatory) for “-1- sek 114-2- apj 1987”? With that, I can help pinpoint the exact article.