Questions tagged [alignment]

The tag has no usage guidance.

Filter by
Sorted by
Tagged with
3
votes
0answers
48 views

Precise meaning of collimation/alignment of a binocular

My question is about what exactly is meant by a binocular being collimated/aligned. I'm familiar with optics in general, but not with the nitty gritty of binocular design. There are various resources ...
1
vote
0answers
14 views

Re-align HST narrowband images to GOODS-S

I want to re-align the image data of filter F658N to GOODS-South catalog with TweakReg. I used the external catalog of image data generated by SExtractor as input catalog (threshold is set to 5.0) ...
1
vote
1answer
55 views

How often are there five planet apparently aligned within 25°?

I chanced upon this in Stellarium. Is it common for five planet appear to align within 25°-30°, viewed from any of the inner planets?
3
votes
3answers
1k views

Are we seeing a conjunction these mornings?

I have a doubt about planetary conjunction. These days, we can see Saturn, Mars, Jupiter and the Moon close to each other. I mean if Saturn, Mars, Jupiter and the Moon were in conjunction with each ...
2
votes
2answers
138 views

Finding Quintuple Planetary Alignments with SkyField

I am working on a python script that will use the SkyField and SciPy libraries to find quintuple planetary conjunctions and their corresponding constellation location. Specifically I am looking for ...
3
votes
1answer
301 views

Unable to locate Big Dipper through Polar Axis Finder

I have recently purchased a CG-4 Polar Axis Finder for my CG-4 mount. This PAF has markings on the lens for aligning with Big Dipper or Cassiopeia, which looks like this: I have aligned the PAF to ...
6
votes
2answers
155 views

Jupiter-Venus conjunction is vertically aligned. I'm at 49° N. How is this possible?

The very beautiful Jupiter Venus conjunction of ~ 2019-01-20 (practically something out of "2001 A Space Odyssey") is seen as "vertically aligned" in the dawn sky, Venus "above" Jupiter. See this ...
2
votes
2answers
298 views

How exactly 'polar aligning' a Telescope with equatorial mount helps?

What is true purpose of polar aligning? Last night, I looked at Mars. It was moving fast. I still need to adjust RA axis to track fast-moving Mars. Why the telescope didn't track it by itself?
0
votes
1answer
158 views

2002 Planetary alignement

In april 2002 the inner planets had aligned and this event was captured in this beautiful photo: But, according to this website simulations for the date, Jupiter was pretty much away. Is that ...
4
votes
3answers
301 views

Measuring misalignment between two positions on sky

Let's say I have the (RA,Dec) for two positions on the sky. I want to measure the position angle between these two positions. In other words, if I had the Cartesian coordinate vectors for these two ...
3
votes
1answer
298 views

Relationship between precession and dating ancient alignments

Perusing the topics here. I am convinced that this is the right place to get some answers. Although it does appear that my question should be relegated to the "childrens table". I am curious to ...
2
votes
2answers
1k views

Algorithm to stack astronomical images

I'm looking for a simple algorithm to compare astronomical images (of the same sky region) against each other, compute their movement and rotation, to finally stack them. At the moment I'm already ...
1
vote
2answers
428 views

Having some weird issues with my tracking (Advanced VX)

I need your help! I am having some weird tracking issues with my tripod (Advanced VX). When I setup and calibrated my scope yesterday I took this picture of NGC6888 (90s exposure): As you can see ...
1
vote
1answer
766 views

Open source alternative for RegiStar (align, rotate, and combine images into single frame)

I'm looking for a free, open-source and Linux compatible alternative to the RegiStar software. I need it to automatically combine several images into a single frame, where each individual image shows ...
1
vote
1answer
41 views

How to watch at best this week's planet alignement?

I read somewhere that counting from today, five planets will be aligned during almost two weeks IIRC. The planets are : Mars, Jupiter, Saturn, Mercury and... us. I know Jupiter and Mars can be seen ...