Real Astronomy with Small Telescopes: Step-By-Step Activities for Discovery

ISBN-13: 9781846284786 / Angielski / Miękka / 2006 / 168 str.

Michael K. Gainer

Opis

Thesmallrefractingtelescopewithitssimpledirectdesignandconstructionand permanently aligned optics is the time tested standard for personal use. Easily portable, it can be taken out of the house and set up at a moment s notice. Or, it can be packed conveniently into a small car for traveling to a dark observing site. With moderate care and minimal maintenance, the telescope and mount canlastforgenerations. These instruments provide sharp, crisp high-contrast images of the Moon and planets. They are less susceptible to the effects of unstable air than larger ones, and because of their low maintenance and durability they are ideal for the parent educator or lifelong learner. Until recently, however, the high cost ofsmalltelescopesofsufficientqualityforseriousastronomicalusehaslimited theiraccessibility. During the past decade, innovations in optical design and manufacture have loweredcostandimprovedquality.Currentdevelopmentsinlensdesignmakeit possibletoproduceaffordablerefractingtelescopeswithshortertubelengthsand greater versatility. The once very costly 90-mm Maksutov Cassegrain, with its optimumcombinationofeffectiveopticsandportability, nowsellsforamodest price. I have often seen small instruments referred to as grab and go or quick look, notworthyofconsiderationforseriousobserving.Imaintaintheycanbe much more. Despite their limits in types of observation, 80-mm refractors and 90-mm Maksutovs have sufficient aperture and magnifying power to provide a lifetimeofobservingpleasure.Theyareidealforlunaroccultationmeasurements, tracking the solar activity cycle, observing variable stars and measuring binary ix x Preface stars. Although all the activities described here are equally applicable to larger instruments, noneofthemrequireanaperturelargerthan80mm. Through the use of common digital cameras, the limiting stellar magnitude andimagescaleofsmalltelescopescanbeincreaseddramatically, thusproviding resultsonenormallyexpectsfromlargerinstruments.Muchofthisbookapplies thatprincipletomakinginterestingandusefulastronomicalobservations.Ihave takennovelapproachestoextendingtheuseofsmallinstrumentsforquantitative observations by applying unique methods for the analysis of digital camera photographs."

Recenzje

From the reviews:

"The dozens of projects collected here are a combination of observations suitable for current research (such as classifying sun-spots or monitoring binary stars) and recreating classic experiments (such as determining the speed of light by timing Jupiter's moons). ... Besides ample nuggets for science projects, a motivated amateur will gain understanding by doing the work, and ... add purpose to his or her observations." (Stuart J. Goldman, Sky & Telescope, May, 2007)

"Amateurs and students using relatively small telescopes can and do contribute useful data to many areas of astronomy. The subtitle Step-by-Step Activities for Discovery is an accurate depiction of what is provided to help novices do just that. Charts, diagrams, photographs of setups, and background information for a variety of observations are included. ... Summing Up: Recommended. General reader; lower-division undergraduates; faculty." (D. H. Gifford, CHOICE, Vol. 44 (11), August, 2007)

Spis treści

Introduction Optical properties and performance expectations for small telescopes Commercially Available Telescopes Telescope mounts Essential accessories Essential references Observations of Lunar topography How to measure the dimensions of Lunar surface features Lunar photography with a digital camera Lunar occultations Observations of the Sun Determining sunspot number and type Contributing to the international database for solar activity Observations of planets Observing the relationships between apparent diameter, phase and position of Venus. Measuring the diameter of Jupiter. Using occultations of Jupiter’s satellites to measure the velocity of light. Binary stars Variable stars: method of observation Variable stars: contributing to the international data base Star clusters, nebulae and galaxies: learning to be a critical observer by sketching what you see. Appendices

Blurb

It’s often said that astronomy is one of the very few sciences in which amateurs can make a contribution to real science. Even modest telescopes such as a small – 3-inch (80mm) – astronomical refractor or Maksutov can provide scientifically useful data.

This is certainly true, but where to start?

Real Astronomy with Small Telescopes tells you everything you’ll need to know about how to get started on "real" astronomy using a small telescope (and ideally a digital camera), and make a real contribution to our scientific knowledge. This book is the necessary introduction to real astronomy – derived from the author’s many years of experience in teaching the subject – that can be your starting point for serious work. Here, the emphasis is on what you can do with a small telescope, rather than just on what you can see through it.

Finally, owners of big telescopes shouldn’t be put off – everything in this book applies equally (maybe more equally!) to larger instruments.