Saguaro Astronomy Club, Phoenix, AZ Volume 37, Issue 4 April 2013 Saguaro Skies Inside this issue: The President’s Corner Click Links to jump Another All Arizona Messier Mara- everywhere. Meade had entered the thon is in the books, and it was a re- field, competition brought prices down, Editor Notes/Calendar 2 sounding success. Special thanks to Rick and the combination of portability, aper- (Rick Rotramel) Tejera and Jack Jones for their efforts to ture and motorized mounts which could organize and ensure that everything track at the sidereal rate was unbeat- Last Call - Ursa Major 3-5 (AJ Crayon) came off without complications. The able. Then came the large Dobsonian Moon was a bit brighter and lingered era, soon to be accompanied by the above the western horizon later than we prevalence of high quality refractors fea- Call For Observations 6 might have liked, but the clear, dark and turing ED doublets and apochromatic (AJ Crayon) very transparent sky was favorable com- triplets. These two classes of telescopes, pensation. As added bonuses, the combined with CCD imaging technology, AAMM Pics/March 7 breeze abated and the temperature was have had a profound effect. Not only are Speaker/25Yrs.Ago 8 very comfortable all night long. the Newtonians on German mounts March Mtg. Minutes 9, 10 It struck me as I was wandering gone, I don't recall seeing even one fork- 10 Years Ago in SAC about the field Sunday morning that I've mounted SCT at the airfield. It was been witness to three distinct epochs of pretty much a collection of large Dobs And They Build Tele- 12 amateur astronomy. When I first for visual observing or refractors with scopes reached the point where I could buy my electronic cameras at their focal planes. (Rick Rotramel) own telescope, the popular instrument One can only wonder what the next SAC Observing: AAMM 15 was a Newtonian on a German equato- forty years will bring to our hobby. Report/Results rial mount. Think Criterion Dynascope, -- Mike -- (Rick Tejera) or if you had the money, Cave. Celestron was well established, but the price of a mailto:[email protected] SAC Astro-Imaging 16 http://saguaroastro.org C-8 in 1974 put On Being Double Minded 17 those telescopes Quick Calendar: (Richard Harshaw) beyond the realm of "entry level". Re- Tuesday, April 23, ATM/Astro-Imaging Meeting fractors basically fell Friday, April26, SAC General Meeting: Guest Speaker, Special points of interest: into two categories: Professor Paul Knauth, ASU School of Earth and Space Explora- Spaceflight Trivia: page 2 department store tion—Subject to be determined T-Bird Star Party: page 11 specials and Uni- trons. Aperture was Wednesday, May 8, Arrowhead Elementary School Star Party Officers & Contacts: page 13 king, however, so For Info click here: http://arrowhead.dvusd.org/images/stories/downloads/Science_flierREV13.pdf link Meeting Location: page 13 good refractors Saturday, May 18, Thunderbird Park Public Star Party link Membership form: page 14 were a rarity. By the Click the link below for a complete 2013 Calendar of events: http://saguaroastro.org/webcalendar/month.php?date=20130301 Header image © Tom Polakis. The stars of Scorpius late 80's, SCTs were setting over the Estrella Mountains in Arizona. Page 2 Saguaro Skies Click logo to return to page 1 Schedule of Events 2013 Editor Notes Hope all who went to the AAMM SAC Meetings had a good time, I sure did. This issue documents that triumph. A big three cheers go out to April 26, 2013 Rick Tejera for running a super Marathon for SAC and May 24, 2013 the rest of the folks from North America. June 21, 2013 July 19, 2013 Also please enjoy the Bits and Pisces stuff, Last Call, August 16, 2013 ATM, Being Double Minded & Astro-Images. September 20, 2013 AJ has some concerns and notes in his Last Call and October 18, 2013 Call for Observations. Please consider chatting with him November 15, 2013 about it, he would really like that. December (14?) TBA Here’s hoping you all enjoy, (Holiday Party) Rick Rotramel, Editor ATM / Astro-Imaging Mtgs. On the Tuesday prior to the SAC Meetings Tuesday, April 23, 2013 at 6:00 PM @ Paul Lind’s shop ([email protected]) Major Star Parties Fredericksen Meadow Fri/Sat, June 7/8, 2013 http://saguaroastro.org/content/Meadow-Directions.htm The editor doing the Marathon. Photo by Tom Polakis Grand Canyon North Rim Sat/Sat, June 8-15, 2013 Spaceflight Trivia http://saguaroastro.org/content/2013GrandCanyonStarPartyNorthRim.htm Can you name the mission involved in this All Arizona Star Party ( EVAC ) picture below? (see answer on page 5) Fri/Sat, October 4/5 ? (TBA) Antennas Schwaar-Gaze Fri/Sat, November 1/2, 2013 http://saguaroastro.org/content/db/antennae-handout.pdf Outreach Star Parties Arrowhead Elementary School Star Party Wednesday, May 8, 2013 Time 6:00-8:00 PM 7490 W. Union Hills, Glendale AZ Thunderbird Park Saturday, May 18, 2013 http://www.saguaroastro.org/content/t- bird 2013.pdf © NASA _ Volume 37, Issue 4 Page 3 Click logo to return to page 1 Last Call - Ursa Major By AJ Crayon This is the first of two part observing list in Ursa 11” SCT at 127x; Richard Harshaw: Pretty bright Major. This part covers the constellation from the spindle with a very rapidly brighter middle; about a western most to around 11 hours of right ascen- 4:1 Aspect ratio. An 11th mag star is 5' N. sion. This puts us about the position of the pointer 11” SCT at 125X; Steve Coe: pretty faint, pretty stars. There are lots of galaxies in this neck of the small, much elongated at 2.5X1, suddenly much woods making it a toss up for selections. I hope brighter middle with a prominent nucleus. you liked them. There has been a problem with this column for The next galaxy is near the last several months that we need to discuss. Talitha, better known as The problem is not enough observations are being iota Ursa Majoris and is submitted by the membership and, as a conse- the elliptical galaxy quence, I have had to resort to using many of my NGC2693. It to is a pretty and Steve Coe’s observations. This isn’t the intent bright mag 11.8 and has of this column; the intent is for SAC observers to dimensions of 3’X2.1’ with be submitting observations. Actually I don’t mind a position angle of 160°. using some of our observations, but it gets to be a William Herschel discov- problem when they are the large majority. ered it in 1790. So the question is what do we need to do 8” SCT at 206x; Richard Harshaw: Bright starlike about the lack of submitted observations? Should nucleus and faint halo. Tube movement and the model for this column be changed and, if so, to averted vision helped greatly. what? What about another author with a different NGC2816 an Sc, which is also known as intent and another name? How about an imaging NGC2742 a Herschel 400 entry, is a rather faint column? Let me know your thoughts either in per- mag 12.1. It is elongated by 2:1 in an 87° position son or via e-mail. Actually let me know if you have angle. William Herschel discovered it in 1790. even read this far but don’t have any comments. As indicated this will be the first of a two con- NGC 2816 is probably John Herschel's second secutive month study of Ursa Major and its galax- observation of NGC 2742. The first came on 8 ies. This month will cover the western part, mean- March 1832 where the galaxy is recorded at its cor- ing from the beginning to about 11 hours of Right rect position, close to where his father placed it Ascension, or to the pointer stars Dubhe and when he found it in 1790. John Herschel called it Merak. "vF, pL, R, vgbM, 60"; moon very troublesome. A * 8 m np." (This compares to his father's rather more interesting note, "cB, E near par., er, bM; 4' l, 2' b. I The first galaxy is suppose, with a higher power and longer attention, NGC2654 a barred spiral the stars would become visible." William Herschel's that has two stars involved. "er" means "extremely mottled," which leads to his It is a pretty bright mag 11.8 comment about the stars.) and edge-on at 4.2’X0.8’ It Just three weeks later, on 30 March 1832, John is classified as a Sbab sys- Herschel swept over the area again, this time re- tem. Discovered by Ernst cording an "F, pmE" nebula 13m 30s to the E at the Temple in 1882. same N polar distance. There is nothing at that Page 4 Saguaro Skies Click logo to return to page 1 Last Call - Ursa Major (Continued) position, a fact first noticed by Reinmuth in his 11” SCT at 127x, Richard Harshaw: The brilliant 1926 "Die Herschel Nebel." wide double star LDS 2863 lies on the SW side of Since the declination is the same, and the de- the field, so you will have to nudge it out of the scription for NGC 2816 appropriate for NGC 2742, field to see this very dim and delicate galaxy. The galaxy lies about 4' S of an 11th mag star and shows I'm going to suggest that the th two nebulae are the same. only a slender oblate nucleus and small halo. A 13 Even though the RA differ- mag star is 1' E, and a 14 mag star 1' SW.