Sky & Telescope - USA (2019-11)
skyandtelescope.com • NOVEMBER 2019 59 32-inch refl ector. Using the usual for- mula that correlates magnitude and dis- tance, a ...
AL L^ IM AG ES BY FR AN K^ C OL OS IM O OPEN CLUSTERS by Al Lamperti, images by Frank Colosimo 60 NOVEMBER 2019 • SKY & TELE ...
skyandtelescope.com • NOVEMBER 2019 61 Tr u m pler Classifi cation All open clusters can be graded using the classifi cation sch ...
62 NOVEMBER 2019 • SKY & TELESCOPE M52 M103 King 1 King 2 King 3 King 4 King 12 King 13 King 14 King 15 King 16 King 20 King ...
skyandtelescope.com • NOVEMBER 2019 63 pKING 13 There’s a grouping of stars on the edge of a lopsided trapezoid asterism. I see ...
Open Clusters 64 NOVEMBER 2019 • SKY & TELESCOPE M36 M37 M38 King 22 f ¡ c d + _ h l m ` e AURIGA Capella 5 h 40 m 5 h 20 m ...
skyandtelescope.com • NOVEMBER 2019 65 King 4 King 5 King 7 King 6 f e d o a _ b h + CAMELOPARDALIS PERSEUS CAS 4 h 30 m 4 h 00 ...
Open Clusters 66 NOVEMBER 2019 • SKY & TELESCOPE M93 King 24 ο ξ ρ PUPPIS CMa 8 h 00 m 7 h 50 m 7 h 40 m –30° –25° –35° η π ...
skyandtelescope.com • NOVEMBER 2019 67 M27 Altair M71 King 25 King 26 King 27 ¡ c t r a _ ¡ _ ` b c a _ AQUILA SAGITTA VULPECULA ...
S&T Test Report by Richard S. Wright, Jr. AL L^ I MA GE S^ B Y^ T HE AU TH OR Celestron’s RASA 8 Schmidt Astrograph Lightnin ...
pAttached to the RASA 8’s corrector plate is an additional set of corrective optics and the camera mount, seen here with its thr ...
S&T Test Report 70 NOVEMBER 2019 • SKY & TELESCOPE This leaves DSLR users out of the RASA 8 game, as no current DSLR wil ...
skyandtelescope.com • NOVEMBER 2019 71 Flat-Field Challenges Proper image-calibration is essential for good astrophotography res ...
Kit Schweitzer’s 35-Year Dream Some projects take a while but are well worth the wait. THE MOMENT I OPENED Kit Sch- weitzer’s su ...
pThe 3D-printed mounting cradle fi ts in beau- tifully with the rest of the scope. skyandtelescope.com • NOVEMBER 2019 73 taught ...
u DUSTY ORION Peter Ward The famous Orion Nebula complex, comprising M42 and M43 (top), displays an intricate mix of emission an ...
skyandtelescope.com • NOVEMBER 2019 75 350-piece Mars from Viking 1 orbiter photos 350-piece Moon from Lunar Reconnaissance Orbi ...
GALLERY 76 NOVEMBER 2019 • SKY & TELESCOPE Gallery showcases the fi nest astronomical images submitted to us by our readers. ...
As you travel in comfort from Rome to Florence, Pisa, and Padua, visit some of the country’s great astronomical sites: the Vatic ...
ACCESSORIES Your essential source for astronomical products BOOKS 78 NOVEMBER 2019 • SKY & TELESCOPE Much, much more than ju ...
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