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Topics - rennlispuring

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We truly live in interesting times...

GW170817 is a gravitational wave signal observed by the LIGO/Virgo collaboration on 17 August 2017, and is the first such event simultaneously observed in telescopes with an electromagnetic counterpart.[1] The signal, which had a duration of about 100 seconds, is the first gravitational wave detection of the merger of two neutron stars, and was associated with a soft short gamma-ray burst GRB 170817A,[2][3] found in NGC 4993.[4] No neutrino candidates consistent with the source were found in follow-up searches

This pretty much confirms that short gamma ray bursts are from merging binary neutron stars. This also shows where much of the elements heavier than Iron come from:

The gravitational wave signal indicated that the gravitational wave event was associated with the collision of two neutron stars[6][7][12][9] with masses between 0.86 and 2.26 times the mass of the Sun (solar mass). If a low spin is assumed, consistent with those observed in binary neutron stars that will merge within a Hubble time, this mass range reduces to 1.17 to 1.60 solar masses.[1] The total mass of the binary system was between 2.73 and 3.29 solar masses.[1]
The neutron star merger event is thought to be a kilonova. Kilonovae are candidates for the production of half the chemical elements heavier than iron in the Universe.[4] A total of 16,000 times the mass of the Earth in heavy elements is expected to have formed, including about 10 Earth masses of gold and platinum.[13]
It is not known what object was produced by the merger. Candidates are a neutron star heavier than any known neutron star today, or a black hole lighter than any known black hole.[11]

That is a LOT of precious metals...

Good Morning All,

I received my C90 and am impressed so far with it for Grab and Go Purposes for Land and Sky viewing. I am now wondering if there are any benefits(image quality) to be realized by upgrading to a set of different diagonals for Land and Sky use.

If so, can you recommend some models of diagonals to consider?

Thanks in Advance!


Eyepieces Questions & Recommendations / Looking for a new Wide-Angle EP
« on: December 29, 2017, 05:49:11 PM »
I recently went to a 2 inch diagonal on my Nexstar 8se and bought a 2 inch SuperView 42mm EP from Highpoint Scientific for my wide-angle EP. It's okay but it's a little hard to focus and the stars at the edge of the FOV seem to be pretty distorted. I use it as my go to EP for DSOs.

I'm thinking of upgrading it and had my eye on a few Explore Scientific EPs. The 62 degree line is on sale right now and the 40mm would give me just under the FOV that I have now. I also had an eye on the ES 68 degree 40mm and the 82 degree 30mm but those jump up in price pretty substantially. Will I really notice a huge difference with those over the 62 degree line?

Any recommendations would be appreciated!

Reflectors Telescopes Forum / Different Collimation Question
« on: December 29, 2017, 06:10:17 AM »
OK, need this explained to me, more a 'how come' kinda question...

Read my thought process and tell my if or why I'm seeing this wrong.

1) A laser is supposed to be good to point the 2ndary at the primary center, but not as accurate if 'used as advertised' to collimate the primary. What I've read is, that if the laser isn't perfect, and not perfect in the focuser (maybe angled a teeny bit), it throws it off. OK, makes sense.

2) So if we use a barlowed laser, it actually collimates it more accurate since focuser errors are eliminated.

Now here are my questions/issues with that.....

1) When we do a barlowed laser, we center the shadow over the center hole in the covering on the bottom of the barlow, so if the focuser is a bit off, then that center hole is off also from true perfect center. If the barlow itself shifts, then it's bottom hole shifts changing 'where' we center the target anyway.

2) If we do a star collimation, we use an eyepiece to 'see' the star, so aren't we in effect collimating to the 'view' of the eyepeice, which is also influenced by any slight errors in focuser placement, or how 'tight' you clamp in the eyepiece etc?

In my mind, it kinda seems like a laser used by itself, is collimating so the primary is pointing at 'laser center', which would be similar to 'eyepiece' center since both would be held the same by the focuser?Does that make sense?
Basically, trying to understand why it would be better to have the primary not lined up with the eyepiece center when we use eyepieces to 'view' objects and 'view' a star collimation? Isn't doing a star collimation (the best final true method) (since if the star isn't in the perfect center of view it'll be slightly out of collimation) dependant on 'where' the eyepiece is 'seeing' the center of view?

Mounts Questions & Expirience / DSP Hypertune for CGX?
« on: December 27, 2017, 01:52:58 PM »
I see Deep Space Products is offering a Hypertune service on the CGXs, at $465. Has anyone had this done, and did it resolve your CGX performance concerns? They claim to reset worm meshing and backlash as part of the tune. The shipping costs would kill me, it would be nice to get a kit for DIY. If they would bring out a belt drive upgrade kit, which included a motor pulley replacement i would buy that.

Beginners Forum / What straps to help carry 10 inch dobsonian?
« on: December 24, 2017, 01:40:00 PM »
Hi,I've learned about straps being called to, to be able to more readily take the body of bigger telescopes.What are such straps and where do I buy them? (no luck looking for them online, yet)Thanks!Juggernaut

General Astronomy & Observing / Upcoming trip to Kona, Hawaii
« on: December 24, 2017, 09:24:57 AM »
In a couple of weeks, my family is going to be on the Big Island over my brothers Spring break.  We'll first be staying about 20 mins North of the Airport and then completing down our trip at the Volcanoes National Park to get a couple of days.  I intend to bring my ST80.  Any suggestions for all those two places?  Thanks.

Beginners Forum / Beginner Setup... What's missing?
« on: December 24, 2017, 04:23:15 AM »
Hello "Nightonians",

Where to Start... Ok, as some already know I'm new to this hobby.  I've attempted to put up myself with a quality"Starter Kit", one that I can also grow with.  So much my installation comprises: Zhumell Z8, Baader Hyperion Mark IV Zoom, Zhumell 2x Barlow, Telrad, attachment case, planisphere, Turn Left at Orion (book), and little red flashlight.

...I just recently obtained (previously back ordered) that which I believed would complete my entry bundle, an 8" solar filter made from Orion.  Regrettably, I havediscovered itis not compatiblewith my Z8 (won't fit).

. . .Now the question is do I return the filter for another helpful thing, or can somebody recommend a filter that will actually fit the Z8? ...

Any suggestions? ... Is a solar filter value theinvestment early on? . . .Is that there amore usual itemI shouldbe contemplating when starting out? ...

I'm simply trying to make the most out of the mishap and turn it around for the positive.

Thank you!

Beginners Forum / First scope search is down to three. Help?
« on: December 24, 2017, 03:20:14 AM »
After weeks of Posting and Reading on another forum (where there are a couple of long-time astronomers I trust) and Almost an hour on the phone with High Level Scientific, I Have narrowed our "first Range" question down to 3:

Celestron Omni XLT 102mm Refractor on the CG-4 bracket
Celestron Omni XLT 150mm Reflector on the CG-4 bracket
Orion XT8 Classic

We will be viewing in our back yard and in the parking lot of a nearby observatory, both with similar light conditions.  I see pluses for the CG-4-mounted scopes since I can put new OTAs on the mounts if I want to experiment afterwards, but the value of the XT8 appears to be tough to oversell.

I've budgeted for a fundamental pair of eyepieces just to learn what they do and which ones I find useful together with a collimation eyepiece if needed (the XT8 includes a cap, so the XLT 150 does not come with anything so far as I understand).

Can anybody provide any guidance on those choices?  I like the ability to put in a motor for tracking, but for our funding I'd rather spend the money on optics than GoTo.  Thanks!

P.S..  We combined a local ministry team and attended a celebrity party with access to an ETX-125, a dob like the XT8, an Astromaster 114EQ, a pair of CPC 1100s (if I recall correctly), and the 24" in the observatory.  The scopes were pointing in the heavens, though, which did not tell us much about how they'd manage other objects.

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