Telescope buying?! Wonderful!

This can get really complex, and, as you imagined, very expensive.  There is this sudden realization that good scopes are pricey, and the less expensive ones are, well, to be honest, not worth the cash. They end up in closets or basements.  For a first time telescope, especially for kids, I always recommend a really good pair of 8×50 or 10×60 binoculars. These get good use at night, AND during the day… bird, scenic views and the like.  If we are talking seriously into astronomy and telescope are the only choice, then go for the most scope you can afford: one with a quality heavy mount and large aperture.  My close friend Ed Ting has made a wonderful page with a load of buying tips here:  http://scopereviews.com/begin.html Do start there and work through it.  At all costs avoid the department store telescopes. They are a plague in our science with their cheap, shaky mounts and promises of ridiculously high powers 😉

Coupled with a telescope purchase is the inevitable need for some accessories. I’ll list a few here to consider:

  • A wide range of good eyepieces. These get expensive but will last a very long time. I recommend three to start, one for low, medium and high magnification. Magnification can be found by dividing the telescope’s focal length by the focal length of the eyepiece. Typical low power magnifications are on the order of 25-30x.  Medium: 75-150x. High: 200-300x. One rarely uses the high magnification. Honest!
  • A good sky atlas. Good ones can be used for eyes, binoculars and small telescopes like these options: Sky & Telescope’s Pocket Sky Atlas – Jumbo Edition and the Sky & Telescope’s Pocket Sky Atlas.
  • A red-light flashlight. A simple regular flashlight with red cellophane covering is good.
  • Maybe even a subscription to Sky & Telescope Magazine or Astronomy Magazine. These help the newcomer by projecting what good targets will be available in future months.

Stay well and enjoy clear skies!

Jupiter and Saturn’s Big Month Together: 2020 December

Those looking up at the sky through late November to late December are in for a real treat, a close conjunction of Jupiter and Saturn. This is quite an event! It will be easily visible to those with or without optical aid. It takes place early in the evening, so even those who go to bed early can enjoy. All you need is a clear early evening and a low horizon to the southwest. Here’s a short video to show you more. Enjoy!

https://youtu.be/rKwFqnVdKiM

NGC 6888: The Crescent Nebula

Last night’s target now processed… stage 1…. the initial offering. Sometimes I remain happy with the first edit, sometimes not. This is NGC6888, the Crescent Nebula in Cygnus. The central star is known as a Wolf-Rayet star, WF 136, which is massive and rapidly shedding its outer laters into the surrounding interstellar medium. This whole system is about 5000 light-years distant and about 25 light years across. This image was taken with our 0.7m telescope through several filters: Luminance is a combination of one hour of clear plus one hour of Ha. The color data was taken using Ha, SII, and OIII narrowband filters.

NGC6888

The Pier is Poured

Yesterday the concrete for the telescope’s pier was poured. What an exciting moment in this telescope’s history. The contractors used a very large Sonotube held rigidly in place with a temporary framework of wood and cables. Internally there is quite the framework of rebar to help reinforce the pier’s strength. A few conduits were also placed inside for electrical and data lines which will drive the telescope. Images (click on them to enlarge):

pier

A view of the building’s site with the framework around the Sonotube for the pier.

pier

A closeup of the pier near the completion of the pour.

Pier

A wide field view of the site.

0.7m Telescope Observatory Construction Begins

This will likely be a series of posts involving some very exciting news here at the observatory: We are adding a new observatory building complete with dome and telescope! Very much exciting times! The new structure will be 16’25’ in dimension with a 16′ diameter dome on the south side. The interior will be divided into two sections: the telescope/equipment room and the control room. A wall with large glass window will separate the two so that people can work with low-level red lighting while keeping the telescope and its sensitive instrumentation in the dark and away from the heat of humans which can cause disturbing air currents.

Artists Impression of the 0.7m Dome

Artists Impression of the 0.7m Telescope Dome.

The telescope is a PlaneWave 0.70m diameter modified Dall-Kirkham optical system with two ports. One port will hold a CCD imager with filter wheel. The other will attach to a fiber-fed echelle spectrograph.  It is difficult to imagine the scale of such an instrument. The telescope alone weighs over 1500 pounds! For a comparison here I am standing besides the same model of instrument at a recent American Astronomical Society meeting.

PlaneWave 0.7m telescope with the author

Ground breaking started a couple of weeks ago. Concrete pouring started today for the pier footing and the footing for the building’s foundation. This will help give a sense of scale the final structure.

The Initial Dig

The boundaries of the structure have been posted here with wooden stakes. The ground is being prepped to dig for the base level foundation.

Gravel base

The gravel base for the concrete has been laid here. Looking closely you can see the inset region in the gravel where the pier for the telescope will rest.

Initial Concrete Pour

The initial concrete pour which took place today. The central region is the base for the telescope pier. The surrounding is the base for the building’s foundation.

 

 

Comet 46P/Wirtanen

Comet Wirtanen has been giving us a moderate showing this time around the Sun. As it has been closer to Earth than it usually gets, we are enjoying a comet that might just get bright enough by December 16th to see without a pair of binoculars.  Last night we checked it out through the school’s 16″ telescope and took some images as well.

Comet 46P/Wirtanen: One is through the 16″, the other is a wider field view through a telephoto lens. The brilliant green color is striking and caused by the excited gases: cyanogen (CN)2 and diatomic carbon (C2).

20-21 January 2019: Total Lunar Eclipse

From: https://eclipse.gsfc.nasa.gov/eclipse.html 

We have a splendid opportunity to see a total lunar eclipse this January. It will be taking place late on a Sunday night into the early hours of Monday morning. That Monday is also Martin Luther King, Jr. Day here in the USA, so many schools will not have classes that day. Eclipse timings are given in the above graphic, in Universal Time.  Converting that to the various USA time zones: 

EventPacificMountainCentralEastern
Partial eclipse starts7:34 pm8:34 pm9:34 pm10:34 pm
Total eclipse starts8:41 pm9:41 pm10:41 pm11:41 pm
Total eclipse ends9:43 pm10:43 pm11:43 pm12:43 am
Partial eclipse ends10:51 pm11:51 pm12:51 am1:51 am

Usually the real eclipse visibility starts to take place late in the penumbral phase approaching the first contact of the umbra. If you have not seen a lunar eclipse before, it is quite a special event. The moon will appear to have a charcoal chunk missing from it as the eclipse progresses.  Deeper into the eclipse, the moon will take on a rusty red hue caused by the sunlight passing through the earth’s atmosphere before arriving at the moon. Telescopes are not required, as one can see the whole event easily with the eye. Binoculars and telescopes will offer a nice closeup view.  Photography of the event is a relatively simple affair. A good tripod and telephoto lens will work well with the moderate shutter speeds required.  Tracking is not needed.  An example of a series of photos I took of the last total lunar eclipse is below. The camera was a Nikon D7000 with 200mm telephoto on a tripod. Click for a larger image.

A New and Potentially Bright Comet!

Don Machholz, Shigehisa Fujikawa and Masayuki Iwamoto have confirmed a new comet which might very well become bright enough to see without optical aid. Stand by for updates here in the coming days as the orbital elements and ephemeris are corrected. The comet has been designated:

MPEC 2018-V151: COMET C/2018 V1 (Machholz-Fujikawa-Iwamoto)

More information from the Minor Planet Center here: https://www.minorplanetcenter.net/mpec/K18/K18VF1.html?fbclid=IwAR2ZmjuWzNVq4QQb4mZNGeVtJdyEhnjZEgmyj08SsUtCcTL_NFqkq5bRUFc

The Annual Perseid Meteor Shower

Each August, the Earth passes through a stream of comet debris from Comet 109P/Swift-Tuttle.  The comet will not be back our way until 2126… so… I wouldn’t wait up for that one.  Along the orbital path, the comet has left behind small bits and pieces, most no bigger than a grain of sand. These run into our planet’s atmosphere and burn up due to friction. The result of this friction-filled reentry is a meteor, a rapid streak of light through the sky.  This shower usually gives us about 60 meteors per hour at peak, and many fireballs: bright meteors that can even be bright enough to cast a shadow.  How to see it?

  • Pick a clear night closest to the peak, which is on August 12th/13th.
  • Go to a dark sky site: avoid lights and cities. The darker, the better.
  • Bring something comfortable to lie down on: sleeping bags are good.
  • Bring food, drink, and bug spray if needed for your location.
  • Spend the night time hours looking up at the sky! No optics required other than your eyeballs.
  • Avoid lights!  No cell phones. No flashlights. Your eyes take between 30-60 minutes to become dark adapted, and you lose that dark adaptation instantly if you see a light. Avoid lights!
  • The shower appears to come from a spot in the sky in the constellation Perseus. This rises just before midnight, so best observing will be after that, into the morning hours.
  • Have fun!

 

Spring: the time for planets. They’re Back!

Now mid-March 2018 and there are planets in the sky!  Here are some of the notable moments.

If you look to the west right after sunset you will catch bright Venus and fleeting (and fainter) Mercury. On March 18th, just after sunset, you might also be able to catch the very young, sliver moon, low on the western horizon.

March 18th 2018 looking west right after sunset.

March 18th 2018 looking west right after sunset.

Are you and early riser? Then you will be able to catch the other bright planets, Mars, Jupiter and Saturn.

Jupiter, Mars, Saturn and the Moon visible at about 5:30am looking southeast on March 12th 2018.

Jupiter, Mars, Saturn and the Moon visible at about 5:30am looking southeast on March 12th 2018.