Astronomy

Nebula and galaxies using 70mm scope

Nebula and galaxies using 70mm scope


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Telescope: Orion 09843 SpaceProbe 3,3 inch aperture(76mm), 700mm focal length, eyepieces - 25mm and 10mm focal lengths. Please tell me whether it is possible to see nebula and galaxies.


You can see some of them with a naked eye. Many of the Messier objects, including galaxies and nebulae are observable even without any telescopes. As for others, if Charles Messier could catalog them in 1771 with a 4 inch refractor, you should see most using your 3.3 inch reflector too given good observation conditions, knowing where to point and using a properly collimated and otherwise maintained telescope.

Messier was from the Northern hemisphere and you seem to be closer to the equator judging by information you provide in your profile, so you shouldn't have problems seeing these objects either, and there are equally interesting objects also in the Southern skies that you could observe. Some of the easiest recognizable on the Northern skies are the Andromeda galaxy, or Messier 31, and the Orion Nebula, or Messier 42. You should also be able to discern quite a lot of detail of other astronomical bodies, including e.g. Pleiades, or Messier 45 which is also visible to the naked eye and many astronomers use to determine observational conditions and their visual acuity by.


Whether you'll be able to see them depends on the levels of light pollution in your area. As TildalWave mentioned, a number nebulae and galaxies are perfectly observable with the naked eye so unless you live somewhere very bright, you should be fine. Under really dark skies, objects like M31 are very easy to find with the naked eye. Where I live, I hardly see it with a bright binocular due to very poor seeing, induced by a large number of shopping centres fond of pointing powerful searchlights at the sky for whatever reason.

As to how much you'll be able to see, you can get a general idea of what you should be able to see in ideal conditions by calculating your telescope's limiting magnitude

In reality, you'll also have to factor in the quality of the optics (mainly transmission), both the telescope and the eyepieces. Of the two you mentioned in your question, you should use the 25 mm one. It will give you a lower magnification, a bigger field of view (better for most bright nebulae and galaxies due to their often significant angular dimensions)

Here's a highly configurable calculator that you can use.

Since you live in the northern hemisphere, objects from the Messier catalogue are great candidates to begin your observations with.


Tony Flanders: Astronomy, Hiking, and Travel

The dominant object of late autumn is M31, the Andromeda Galaxy, by far the biggest, brightest, and most prominent galaxy visible from locations north of the tropics. If you can tear your eyes from M31 and its companions M32 and M110, the octile of the sky from RA 0 to RA 3 also contains a smorgasbord of other interesting objects: two of the galaxies that are hardest to see under heavy light pollution (M33 and M74), the nearest galaxy with an active nucleus (M77), the faintest of the Messier objects (M76), and a very bright albeit sparse open cluster (M34). Here is the complete list of objects for this section, all of the Messier objects from RA 0 to RA 3 minus M103, which was covered in the previous section:

Obj S178 S70 U178 U70 Type Con RA Dec Mag PBrt SBrt Size
M110 3C 3C 4C 5C GAL And 00:40.4 +41:41 8.1 19.8 22.7 22吇
M32 2C 3C 2C 3C GAL And 00:42.7 +40:52 8.1 17.7 21.1 8.7࡬.5
M31 1A 1B 2B 2C GAL And 00:42.7 +41:16 3.4 16.6 22.2 191吺
M33 3A 3B 4C 4C GAL Tri 01:33.9 +30:39 5.7 20.1 23.0 71否
M74 4D 5D 5D GAL Psc 01:36.7 +15:47 9.4 20.5 23.1 11࡯.6
M76 2B 4C 3B PLN Per 01:42.4 +51:34 10.1 18.6 20.4 2.7ࡧ.8
M34 2B 2B 2B 2B OCL Per 02:42.0 +42:47 5.2 —- 21.5 35
M77 2C 3C 3C 4D GAL Cet 02:42.7 -00:01 8.9 18.4 21.6 7.1࡬.0

For a key to this table, see
Key to the Tables.

With the exception of M77 and M74, all of these objects have far northerly declinations, and so remain well-placed for a very long time for observers in the North Temperate Zone, starting typically in the late summer and extending well into the winter, or even the early spring.

Several of the objects listed in the early autumn section are also far north, and remain visible throughout autumn. And M45, the Pleiades, harbinger of the winter sky, can be seen rising in the east throughout autumn from northern latitudes.


Taken By John Paladini on May 21, 2009

  • 1 sec exposure - Canon Rebel On Tripod - AFOCAL
  • 50mm yachica SLR lens on BIPH Nosepiece
  • Camera pointed at Eyepiece

Tree tops at bottom of image give reference to size of nebula in the sky!


Rosette Nebula by John Paladini using his 70mm Vivitar SLR lens with the 2" BIPH H-alpha filter.


Crescent Nebula, taken by John Paladini. 10" F4 Coulter and 3 sec exposure with H-a filter.

Horsehead Nebula by John Paladini using his 10 inch Coulter scope.

Taken By John Paladini with a 50mm SLR lens mounted on his BIPH on October 14, 2009.

It is the Orion Constellation (very wide field) and shows Barnard's Loop, which spans the entire constellation. In the same field of view you can see the Flame and Horsehead as well as M42, the Orion Nebula.

The bottom portion that appears cut off is the terrestrial landscape.



Roger Greenwood's Most Excellent Binocular Chair - Stellafane 2008.


Me holding BIPH with the SLR lens attached at The Two Hearted Star Party.



Me and BIPHon the field at Stellafane 2008.



Don Nicholson from Mt. Wilson Observatory on Jimmy Lowry's 48" OMI Dob at Texas Star Party. Don used both the BIPH and traditional Denk II Binoviewers in the scope. BIPH + 48" scope = over 144" aperature !! We had fun !


Nebula and galaxies using 70mm scope - Astronomy

The contenders: Orion's 20X-60X 80mm spotting scope, and the Short Tube 80

Can you use a spotting scope for astronomy?

I get this question all the time from terrestrial observers. My response usually runs something like:

1) For terrestrial observations, you need something called a spotting scope.

2) I don't know much about spotting scopes (aside from some quick peeks through some breathtakingly expensive units from Leica and Swarovski)

3) See if there is someone on the web who does what I do, except with spotting scopes.

But I've gotten to wonder over time: Can you use a spotting scope for astronomy? Over the record-breaking snowy 2014-2105 winter, I had a lot of time to ponder questions like this. While browsing the Orion web site over the holidays, I somehow found their $299 spotting scope, #52421, in my shopping cart. It arrived two days later in a long cardboard shipping container. The scope is often discounted check Orion's site if you're interested in buying one. The scope has a rotating body, a small "backwards" focusing knob on the right side, a non-removable 20X-60X zoom eyepiece, a thin plastic screw-on lens cover, and a 1/4" X 20 mounting block. I attached a Vixen-compatible mounting plate to the latter and placed it on my CG-5.

Orion's Short Tube 80 ($199, check Orion's web site for current prices and possible clearance specials) has been reviewed quite a few times on this site and elsewhere. The scope is a known quantity in our hobby as a decent quality, low-cost quick peek scope. As of this writing, it comes very well appointed for its price - rings, plate, 8X40 finder, 20 mm and 9 mm Expanse eyepieces, and a nice zippered carrying case.

With Orion's sale on the spotting scope, the two scopes are identically priced. However, the spotting scope lacks a finder. I have a Rigel Quik Finder ($45) that I've rigged for small scopes. I drilled some holes in the finder's base and threaded a length of elastic I got from Wal-Mart ($.97) as a quick fix. If you think it defaces the scope, you should know I also use it on my Questar (that loud noise you just heard is the horde of Questarphiles firing off nasty emails to me.) The Vixen plate also costs about $20, so factor that in if you intend to use the scope the way I did.

Mike T and John R joined me that night. We mounted both scopes on CG-5 mounts and went observing in single-digit weather. I polled the guys as to their biases beforehand. We're all biased, of course, but in this case, none of us had any idea how this would turn out. We placed the scopes about 20 feet apart and walked between them. To match powers, we used the supplied 20 mm Expanse eyepiece for 20X, and a 6 mm Radian to nearly match the 60X in the spotting scope.

We star tested both scopes on Procyon. The Short Tube 80 did quite well, considering its price. There was very little spherical aberration, with the expected halo of false color. The spotting scope gave us a little more to talk about. It has a trace of astigmatism. It had about the same amount of false color, but the aberration was more rose-colored than we've come to expect. I would classify the spotting scope as an achromat, and given its price, I was surprised the star test wasn't a lot worse, with all of those prisms in the way.

On Jupiter at 60X in both scopes, the views were again too close to call. All four moons could be seen this night, along with two cloud bands on the surface of the planet. Every time one of us thought we preferred one over the other, it would turn out to be seeing conditions getting in the way. It's a good thing the spotting scope capped out at 60X, because the image was already starting to degrade at that power. We noticed the same thing in the Short Tube 80. Neither scope is going to spend a lot of time at high power. Another draw.

Deep sky yielded the same result. On the Orion Nebula, both scopes looked the same, at both 20X and 60X.

No matter what we did, the scopes were nearly identical optically. I was surprised - I expected one to be clearly better than the other, but it didn't turn out that way.

Mechanically, it was a different story. Built for terrestrial use, the spotting scope lacks the astro-specific conveniences on the Short Tube 80. We kept fishing around to find the tiny focuser, for example, a task made harder through thick gloved hands. And I don't know why, but a 45 degree viewing angle never seems to feel right for astronomy. The spotting scope did win minor convenience points for its rotating body and zoom lens, but overall, we all felt that the Short Tube 80 was easier to use.

So it's a close call, but if we had to choose, all of us would take the Short Tube 80 if we needed to go observing.

For an objective reference, I brought along my TeleVue 85 ($2300, OTA only.) How did it compare? Let's put it this way. Remember in Star Trek when they beamed down to find two primitive warring factions?

Wait. that describes a lot of Star Trek episodes.

The TeleVue 85 walked all over the spotting scope and the Orion Short Tube 80. Blacks were blacker, stars focused down to impossibly small points, and the contrast was deep and satisfying. False color left Procyon and Jupiter. On the planet, we were able to push the power to 200X and it still looked good. The Orion Nebula hung in mid air and had that reach-out-and-touch-it quality. Neither inexpensive scope belongs in the same league as the TeleVue 85. At nearly twelve times the price, it had better deliver the goods. But there is a real difference, and if you've never looked through a good apo, visit a local star party sometime and treat yourself to its views.

So - to answer the question. Can you use a spotting scope for astronomy? The answer is yes. If you're primarily a terrestrial observer who wants to look up at the night sky once in a while, it will do double duty for quick peeks. If you're a regular reader of this web site, however, I think you're still better off spending the money on an astro-specific telescope.


Hubble Captures New Image of Necklace Nebula

This Hubble image shows the Necklace Nebula, a planetary nebula some 15,000 light-years away in the constellation of Sagitta. Image credit: NASA / ESA / Hubble / K. Noll.

The Necklace Nebula is located approximately 15,000 light-years away in the northern constellation of Sagitta.

Otherwise known as PN G054.2-03.4 and IRAS 19417+1701, the nebula was discovered in 2005 by astronomers using the Isaac Newton Telescope in the Canary Islands, Spain.

“The Necklace Nebula was produced by a pair of tightly orbiting Sun-like stars,” Hubble astronomers explained.

“Roughly 10,000 years ago, one of the aging stars expanded and engulfed its smaller companion, creating something we call a ‘common envelope’.”

“The smaller star continued to orbit inside its larger companion, increasing the bloated giant’s rotation rate until large parts of it spun outwards into space.”

“This escaping ring of debris formed the Necklace Nebula, with particularly dense clumps of gas forming the bright ‘diamonds’ around the ring.”

“The two stars which created the Necklace Nebula remain so close together — separated by only a few million km — that they appear as a single bright dot in the center of the new Hubble image,” the researchers added.

“Despite their close encounter the stars are still furiously whirling around each other, completing an orbit in just over a day.”

The new image of the Necklace Nebula was made from separate exposures taken in the visible and near-infrared regions of the spectrum with Hubble’s Wide Field Camera 3 (WFC3) instrument.

Six filters were used to sample various wavelengths. The color results from assigning different hues to each monochromatic image associated with an individual filter.


Is this a good telescope?

It seems like a very nice telescope for watching close, bright objects that you can easily track. The Moon is the obvious target. Should be enough to just about discern Saturn's rings or Jupiter's moons.

The altazimuth mount will make observing anything at large magnification a pain, and the poor light gathering capacity will pretty much preclude seeing galaxies and nebulae as anything other than blueish, diffuse blobs.

Overall, I think it's good at what it aims to do - being an entry-level telescope. You'll learn a lot about what observations entail, as well as what you can expect to see, and will likely find out if it's worth investing in anything more advanced.

I just bought this it will be my first telescope. I won't post the link to the website but I'll post the name and description of the telescope :)


    • 70 MM ULTRA-CLEAR TELESCOPE - This fantastic telescope can ensure good imagine quality, correct lateral chromatic aberration, congitudinal chromatic aberration and distortion, with 70 mm larger caliber, 5X24 finderscope and the latest generation of Kellner eyepiece(K).
    • MAGNIFICATION - 16X, 67X. K6mm eyepiece for 67X, K25mm eyepiece for 16X. Finderscope for 5X maganification. Focal length: 400mm. Aperture: 70 mm.
    • ADJUSTABLE TRIPOD - Scalability aluminum tripod, height can be adjusted from about 16-inch to 41-inch, and it permit to use the telescope both in standing or sitting position .
    • DEW SHIELD & DUST SHIELD - With a dew shield and dust cap, one can use it without worry about fogging on the surface of primary mirror and keep tube device from dust in normal times . Amazing telescope for travel and camping.
    • PORTABLE & RELIABLE- Easy to intall and disassemble, with an adtional rucksack for transporting it around and keeping it protected whilst he's not using it. Suitable for beginners to explore land & sky! Offers 24-month warranty, quick replies in case of problem, and instant refunds.

    I think it is about par for a first scope. I am intrigued by the idea of a camera-style tripod head to replace the old alt-az style mount heads. The possible downside is that poor tripod heads can be sticky, but at least you can guide it straight to where you want it to go, unlike the alt-az, which usually has a screw to adjust for the alt. I went on a vacation last year to Africa and took a spotting scope on a bad tripod and while it was a bit of a pain, I was able to see and show people all the bright planets and moon.

    And don't listen to people who say 70mm is too small: 60mm has been the standard first telescope aperture for 50 years.


    Explore Scientific 102mm CF FCD100

    The Explore Scientific ES102ED FCD-100 telescope was my first refractor, and it's my main imaging workhorse. Out of the box it's a 102mm (4") refractor, with around a 714mm focal length at F/7. I've added a StellarVue .8x reducer bringing the focal length down to 571.2mm, and F/5.6. This focal length works for a lot of small to medium sized nebula, and a few galaxies. The telescopes weight is 7 lbs as a carbon fiber scope, and allows me to add a fair amount of imaging gear to it without taxing the mount which is rated at 30lbs payload. I'm tempted to get a flattener so that I can image at 714mm and get a few more galaxies at a more proper size.

    I took the plunge into mono just recently (see the blog post here). I've been very interested in getting into mono imaging for narrowband and LRGB captures. Light pollution is terrible where I live, and narrowband imaging is one way to get around that as light pollution has very little effect when using narrowband filters. I'm currently using a ZWO ASI1600MM-Cool camera, with the ZWO 8 slot electronic filter wheel and a full set of Astrodon LRGB, HA, SII, and OIII filters. For guiding I'm using a Stellarvue 50mm guide scope and a ZWO ASI224MC camera. A few of my newest images are posted to Astrobin.


    The Nebula

    The Flame Nebula, designated as NGC 2024 and Sh2-277, is an emission nebula in the constellation Orion. It is about 900 to 1,500 light-years away.

    The bright star Alnitak (ζ Ori), the easternmost star in the Belt of Orion, shines energetic ultraviolet light into the Flame and this knocks electrons away from the great clouds of hydrogen gas that reside there. Much of the glow results when the electrons and ionized hydrogen recombine. Additional dark gas and dust lies in front of the bright part of the nebula and this is what causes the dark network that appears in the center of the glowing gas. The Flame Nebula is part of the Orion Molecular Cloud Complex, a star-forming region that includes the famous Horsehead Nebula.

    So how do you find it? Sounds simple. Find the belt. look to the star Alnitak (if you need help, check the image) it’s the left most star in the belt. But not just any telescope is goign to let you see it. I had to locate Alnitak and look around it, with the star in the edge of the shot, Then increase the shutter time until I saw hints of it. I then saw stars in the nebula and used that as a guide to center the image.

    /> Incase you didn’t know where things where located in Orion. . . . Image Credit Stéphane Guisard Los Cielos de Chile and Robert Gendler


    Bodes Nebula and the Cigar Galaxy

    It was finally clear last night, so I shot a pair of galaxies.

    M81 (Bodes Nebula) is 12 Million light years away and spans around 90,000 light years across.

    M82 (the Cigar Galaxy) is 12 Million light years away. It is a Starburst galaxy and makes stars 10X faster than our galaxy. The bright core is exploding with Hydrogen gas (the red areas in the center).

    I decided to see how my mono camera with filter wheel works with the RASA 11. I was wondering if the large filter wheel would affect the image too much or not.

    It looks like it will work fine with the filter wheel and also with my normal filters. So I won't have to buy the expensive 2" "fast" filters for this scope. Some of the stars are very slightly out of round, but I think I can fix that with making a mask to sit in front of the filter wheel.

    Anyway, here is the photo. This is an integration of:

    Lum: 200, 20 second images
    Red: 48, 45 second images
    Green: 48, 45 second images
    Blue: 48, 45 second images
    H-Alpha: 40, 90 second images

    Celestron RASA 11
    ZWO ASI183MM Pro
    EQ6-R Pro
    ZWO ASI290MM MIni Guide Camera


    Why Scientists Are Shooting Lasers at This Extremely Badass Nebula

    The European Southern Observatory (ESO) recently debuted the stunning image above, which appears to be an epic space battle with a purple cosmic blob, but in reality, shows astronomers using a clever trick to observe one of the largest nebulas in the night sky.

    🌌 You love badass space stuff. So do we. Let's explore the universe together.

    The Carina Nebula is a stellar nursery of gas and dust surrounding a pair of giant stars called Eta Carinae. Eta Car A, the primary star of the system, is one of the most massive and volatile stars in the sky. Because of the star&rsquos extraordinary mass, it burns through its nuclear fuel like a full-sized SUV, causing it to routinely become unstable over the last 200 years and eject clouds of gas and dust, forming the surrounding nebula.

    Astronomers expect the star to explode and go supernova in the next several thousand years. With the star&rsquos history of violent outbursts and possibility to explode, should astronomers really be firing lasers at the heart of the nebula?

    ESO is home to what&rsquos considered the world&rsquos most advanced visible-light astronomical observatories, the Very Large Telescope array (VLT). Located in the Atacama Desert of northern Chile, The observatory consists of four Unit Telescopes, each having 27-foot mirrors (8.2 meters) that can warp and deform to correct for turbulence caused by Earth&rsquos atmosphere.

    The turbulence is what causes stars to twinkle, which is great for nursery rhymes, but not so much for astronomers, because it blurs their observations of distant stars and galaxies.

    🔭 The Best Telescopes for Stargazing

    It&rsquos still not exactly cheap, but Orion&rsquos SkyQuest XT8 is one of the best options around if you&rsquore looking to get the biggest aperture for your money. The XT8 is a reflector telescope, which means, at over four feet long and more than 40 pounds, it&rsquos big and difficult to move around. It also isn&rsquot computerized, but it should still be relatively easy for most folks to set up with a bit of practice thanks to its straightforward design and high-quality mount. And as Love the Night Sky explains in its review, the telescope delivers where it counts the most, with a large eight-inch aperture and high-quality mirrors and lenses that will let you clearly view galaxies, nebulae, and deep-space objects.

    With over nearly 7,000 positive reviews on Amazon and a 4.4/5 rating, it's not hard to see why the Gskyer telescope is a fan-favorite. This option features a 70mm aperture and fully coated optimal lenses to offer a crisp, clear view of the night's sky. Tech savvy stargazers will appreciate the smart phone adapter and wireless camera remote, making it possible to view constellations from your screen. Thanks to its adjustable, aluminum alloy tripod, this telescope is suitable for every member of the family.

    Beginner stargazers will find a lot to love about Emarth's Telescope. Using it is easy: All you need to do is point the tube in the direction of the desired object and take a gander. With two high-quality eyepieces (70mm and 360mm) that provide low- and high-power views of celestial objects, you'll be able to satisfy your stargazing wishes with ease.

    Consider NASA Lunar Telescope the perfect option for avid adventurers or kids who are yearning to spontaneously stargaze. Clocking in at a little over two pounds, this option is lightweight enough to stow in the trunk of your car. This telescope features a multi-coated, extra-low dispersion optical glass to ensure you'll score a clear, perfectly contrasted view of the night's sky.

    As TELMU proves, it's possible to find a great telescope for a bargain. This option features a wide, 70 millimeter aperture that will make stars and constellations appear bright and clear. With two eyepieces&mdashwhich ranges from 6 to 20 times the magnification&mdashit's suitable for a range of stargazing experiences. It also has a smartphone adapter so you can view everything directly from your screen. To top it off, TELMU's telescope comes with a tripod and finder scope, so you can buy everything you need for one fair, affordable price.

    If you want to take your stargazing game up a couple of notches, Celestron's NexStar 4SE Telescope is ideal for beginners and advanced hobbyists alike. With a four-inch primary mirror, this telescope is compact, but lets plenty of light in so you can see everything the solar system has to offer. Not only does this telescope have a computerized to-go mount that tracks your target's movements, but it also comes with Celestron's app so you can learn more about what you're seeing. If you want to learn something new&mdasheven as an advanced stargazer&mdashthis one's for you.

    This ToyerBee telescope is another great option for kids or beginners. It's equipped with a 3X Barlow lens and two eyepieces, H20mm and H6mm, so you can get a magnification of 15X to 150X. A 70mm aperture and 300mm focal length offers more lights and a clearer image. The telescope is easy to assemble and can be controlled wirelessly (the set includes one smartphone adapter and one wireless camera remote).

    This is where lasers save the day. Using a high-tech adaptive optics facility installed on VLT, astronomers fire powerful lasers toward a target they wish to observe. The laser beams excite sodium particles floating in earth&rsquos upper atmosphere, causing them to glow like artificial stars.

    Computers are then able to use the glowing particles as reference stars to measure the distorting effects of the atmosphere. In real time, the computers can adapt the telescopes optics to take images almost as sharp as those taken in space.

    The technology has allowed VLT to accomplish a number of astronomy firsts, including the first image taken of a planet outside our solar system, tracking individual stars around the supermassive black hole at the center of our galaxy, and observing the dim glow of the farthest known Gamma-Ray Burst. However, time will tell if Earth will receive any retribution for probing the cosmos with lasers.