Herschel 400 Observing Guide
The Herschel 400 is a list of 400 galaxies, nebulae, and star clusters, picked from over 2,500 deep-sky objects discovered and catalogued by the great eighteenth-century astronomer Sir William Herschel and his sister Caroline. It comprises 231 galaxies, 107 open clusters, 33 globular clusters, 20 planetary nebulae, 2 halves of a single planetary nebula, and 7 bright nebulae. In this guide Steve O'Meara takes the observer through the list, season by season, month by month, night by night, object by object. He works through the objects in a carefully planned and methodical way, taking in some of the most dramatic non-Messier galaxies, nebulae, and star clusters in the night sky. Ideal for astronomers who have tackled the Messier objects, this richly illustrated guide will help the amateur astronomer hone their observing skills.
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Appendix A Herschel 400 observing list
Appendix B Herschel 400 checklist
3rd-magnitude 6th-magnitude 7th-magnitude Star 7x50 binoculars Alpha asterism averted vision Barred spiral galaxy Beta bright stars brighter brightest stars Cassiopeiae circular glow Comae Berenices condensed dark sky Dec Mag Dim description NGC Directions Use Chart east-northeast elliptical galaxy elongated eyes or binoculars faint fuzzy Gamma Gamma Comae Berenices globular cluster GX Leo halo larger telescopes lenticular galaxy light pollution little less look low power Mag Dim Rating magnitude and fainter magnitude Star Milky moderate magnification Monocerotis mottled move the telescope NIGHT NGC north-northwest northeast to southwest object Open cluster Ophiuchi oriented northeast pair planetary nebula quick view RA Dec Mag roughly Sagittarii slightly slow and careful small and dim small telescope small-telescope users south-southwest Star charts starlike nucleus Stephen James O'Meara Stop suns switch to Chart target is nearby telescope at low triangle Type Con RA unaided eyes Ursae Majoris view At 23x Virginis Virgo visible west-southwest