Green Bank Star Quest Intro to Astrosketching (revised)
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Transcript of Green Bank Star Quest Intro to Astrosketching (revised)
Green Bank Star Quest 8
Astro Sketching Workshop
Presented byMichael Rosolina
To improve your observing skills
To create a visual record
To exercise your creativity
Why Sketch?
GalileoHuygensMaraldiW.C. Bond & G.P. BondAntoniadiDawesBarnard
Historical BackgroundThese are just a few of the many past astronomers who were keen observersand who sketched their observations:
Source: Galileo Project/Al Van Helden
Galileo was one of the first telescopic observers to draw (and publish) what he saw.
Galileo
Galileo published his observations of Jupiter and its moons in Siderius Nuncius, The Starry Messenger (1610). This is an excerpt from his journal.
Galileo
Source: Galileo Project/Al Van Helden
Galileo
Galileo and his protégéCastelli developed solar projection to accuratelyobserve and record sunspots . Through asequence of solarobservations, Galileodemonstrated therotation of the Sun.
Source: Galileo Project/Al Van Helden
Huygens
Another pioneer in the mid-17th centurywas Christiaan Huygens , who made theseobservations of Mars
Source: The Exploration of MarsBy Werner von Braun & Chesley Bonestell
Maraldi
From 1672 to 1719, Maraldi mademany observations of Mars andmade careful measurements of thepolar ice cap.
Source: The Exploration of MarsBy Werner von Braun & Chesley Bonestell
Antoniadi
By the 19th and early 20th century, improved telescopes were allowing skilled observers to make even more detailed sketches of celestial objects.
Source: The Planet Mars by William Sheehan
From Galileo’s early drawings…
Courtesy NASA/JPL-Caltech
Through the legendary observers of the past,to present day amateur astronomers…
Courtesy NASA/JPL-CaltechPhases of Venus
Astro sketching continues to thrive…
Courtesy Sol Robbins
Sinus Iridum
Courtesy Rich Handy
25July 200712” SCT @ 271x
The Sun inHydrogen Alpha
Courtesy Erika Rix
Courtesy Eric Graff
Double Stars
Star Clusters
Courtesy Rony De Laet
M44The Beehive
102mm RefractorMag: 12.5x & 30x
Courtesy Frank McCabe
Globular Clusters
Courtesy Jeff Young
Galaxies
MeteorShowers
Courtesy of Roel Weijenberg
What makes a good astro sketch?
Record what you see—not what you would like to see
Include information such as instrument used, magnification, and field of view (FOV)
Include time and date (UT), cardinal directions, seeing, transparency, altitude of object, and any other relevant information
Add any other notes you feel are pertinent to your observation
Where do I begin? What should I draw?
Draw what you like to observe—what interests you.
There are as many different astro sketches as there are visible objects in the sky.
Planets
Mars
Courtesy Sol Robbins
Mars
Courtesy Frank McCabe
19 Dec. 20070430-0500 UT10” Reflector Mag: 360xS: Antoniadi II
Jupiter
Courtesy Sol Robbins
Jupiter withPhenomenon
Courtesy Jeff Young
Venus
Courtesy Sol Robbins
Courtesy of Jef De Wit
2010 Apparition of Jupiter
The Sun
Courtesy Erika Rix
Courtesy Jeff Young
Courtesy of Roel Weijenberg
Courtesy Ralph Marantino
8cm refractor @60x4cm PST @ 40x
The Sun inHa and WLJune 17, 2011
Courtesy of Uwe Pilz
The Moon
Gassendi
Courtesy Rich Handy
3 Sept. 200612” SCT @ 244x
Waning Gibbous Moon 28 DEC. 2008 200mm Reflector @ 48x Courtesy Deirdre Kelleghan
Petavius 29 May 200910” Reflector @ 241x & 362x Courtesy Frank McCabe
Lunar Eclipse
21 Feb.2008108mm
Reflector Mag: 21x
Courtesy Frank McCabe
Deep Sky Objects
Courtesy Eric Graff
Courtesy Jeff Young
Courtesy Rony De Laet
M3128 Sept. 200815x70 BinocularsFOV: 4.4 deg.
Courtesy Eric Graff
IC4665Summer Beehive15 Sept. 2007102mm RefractorMag: 16x FOV: 150’
Courtesy Rony De Laet
Asteroids and
Comets
C/17P Holmes03 Nov. 2007102mm RefractorMag: 16x & 20xFOV: 150’
Courtesy Rony De Laet
Courtesy Jeff Young
OccultationsConjunctions
AndTransits
Occultation of Venus01 Dec. 2008 LX 90 @ 57x Courtesy Deirdre Kelleghan
Saturn and PorrimaMay 28, 20118cm refractor @ 120x
Courtesy of Uwe Pilz
Sketch by M Rosolina
What do I use to make my sketch?
Basic Tools for Sketching
drawing pencils, pens, color pencils, Conte’ crayon, charcoal, pastels, chalk
sketching paper, copy paper, black paper, color paper, textured paper, waterproof paper
templates, blending stumps, erasers, eraser shield, sharpener
clipboard, red light, white light, table, chair
What effects can be achieved by the use of different media?
Graphite pencilon smooth white copy paper
Courtesy Sol Robbins
Graphite pencil on white sketchpaper
Last Quarter Moon18 March 200915x70 Binoculars
Courtesy Deirdre Kelleghan
Graphite pencilon white paperinverted digitally
Courtesy Jeff Young
Graphite pencil andcolor pencil on whitesketch paper
Courtesy Erika Rix
The Sun in Ha 10 DEC. 200540mm PST @ 33x
Color Chalk ontextured white paper
Color pen onwhite paper
Courtesy Ralph Marantino
Remember…record whatyou see!
Courtesy Ralph Marantino
White Conte’ crayon,Conte’ pencil, andwatercolor pencil onblack paper
Courtesy Erika Rix
White Conte’ crayonon textured color paper
Total Lunar EclipseThe NetherlandsJune 15, 2011
Courtesy Roel Weijenberg
Pastels onBlack paper
Computer processing is a relatively new tool that can be
used very effectively to enhance and even create astro sketches.
Digitizing your work allows you to present and share it with the global community of amateur
astronomers.
You can add text…
Courtesy Eric Graff
You can add color…
Comet C/17P Holmes04 Nov. 2007
Courtesy Sol Robbins
You can invert…
You can add text to field sketches and make a collage of sequences…
Courtesy Erika Rix
You can even make an animation…
Solar Prominence
Courtesy Erika Rix
… or draw the sketch with the computer…
Alpha Persei Assoc.
(Mel 20)ETX 70 @ 9x FOV: 4.8 deg.
Digital drawing based on a raw
pencil field sketch
Courtesy Rony De Laet
M51 & SN2011dh16” reflector @75x-225x
Digital drawingCourtesy of IVM
What does making a sketch look like?
Here is a step-by-step tutorial.
Let’s start with a lunar target.
First, anchor the sketch by outliningdistinguishing features…
Courtesy Erika Rix
Courtesy Erika Rix
Then add shadows…
Blend to smooth…
Courtesy Erika Rix
Add more shadows.Try to make lightand dark areasinstead of drawingobjects…
Courtesy Erika Rix
Courtesy Erika Rix
Add and blend more shadows.Use your finger and a stump toblend…
Apply backgroundin layers—use a loaded finger or a loaded stump…
Courtesy Erika Rix
Add material in layers…
Courtesy Erika Rix
Keep adding those layers…
Courtesy Erika Rix
Soften by blending…
Courtesy Erika Rix
Add finishing touches and you’re done…
Copernicus Courtesy Erika Rix
We’ve looked at some of the long, rich history of astro sketching.
We’ve seen some prime examples of sketching at its best.
We’ve discussed sketching tools and techniques.
And we’ve learned that sketching not only leaves you with a visual record of your observation…
But most importantly, it trains your eye and improves your observing skills.
Now it’s time for a little hands-on practice.
Observing log M Rosolina
Remember, everyone starts somewhere…
Keep Looking Up!
Sketch Courtesy Frank McCabeOrion
Choose one of the following objects to practice your sketching technique…
M6 Courtesy Rony De Laet
Courtesy Jeff Young
Courtesy Sol Robbins
Jupiter
SaturnSaturn
Courtesy Jeff Young
Graphite drawing pencils, pens, color pencils, Conte’ crayons, charcoal, pastels, chalk
Sketch paper, copy paper, black paper, color paper,textured paper, waterproof paper
Template, blending stump, eraser, eraser shield, sharpener
Clipboard, red light, white light, table, chair
Sketch Materials and Tools
These are some of the many online resources available for tutorials, templares, materials, advice, and companionship:
Cloudy Nights Sketching Forum
http://www.cloudynights.com/ubbthreads/postlist.php/Cat/0/Board/Sketching/page/0/view/collapsed/sb/5/o/all
Astronomy Sketch of the Day
http://www.asod.info/
Jeremy Perez’s Belt of Venus
http://www.perezmedia.net/beltofvenus/
The Association of Lunar and Planetary Observers (ALPO) templates
http://alpo-astronomy.org/
Dick Blick Art Materials
http://www.dickblick.com
Astrosketching Resources
Copyright 2011 Michael Rosolina
All contributor images are theproperty of their respective ownersand are used here with permission