EntityQ773715· pop 15· linked from 18 articlesJoseph AshbrookSign in to saveAmerican astronomer (1918–1980)ConnectionsMoonConceptMarsEntityPennsylvaniaEntityPhiladelphiaEntityInternational Standard Book NumberEntityHarvard UniversityEntitydigital object identifierEntityYale UniversityEntityastronomerEntityInternational Astronomical UnionEntityCepheid variableEntityrotation periodEntitylist of minor planets: 2001–3000EntityAmerican Astronomical SocietyEntitySky & TelescopeEntityAmerican Association of Variable Star ObserversEntityAshbrookEntity47P/Ashbrook–JacksonEntityCategories1918 births1980 deaths20th-century American astronomersHarvard Graduate School of Arts and Sciences alumniHarvard University facultyYale University faculty