Right ascension and Declination calculations

Click For Summary

Discussion Overview

The discussion revolves around calculating right ascension (RA) and declination (Dec) for astronomical observations, particularly in the context of using a telescope. Participants explore the challenges of determining these coordinates based on personal location and telescope orientation, as well as the potential for using tracking motors to simplify the process.

Discussion Character

  • Exploratory
  • Technical explanation
  • Debate/contested
  • Homework-related

Main Points Raised

  • One participant expresses a desire to calculate RA and Dec based on their telescope's position and angle, seeking guidance on how to achieve this.
  • Another participant inquires about the type of mount on the telescope and whether it has a tracking motor, indicating that these factors are relevant to the calculations.
  • A suggestion is made that having an equatorial mount with a tracking motor could simplify the process of tracking deep-sky objects (DSOs) by allowing the user to set the clock using the RA of a known star.
  • There is a mention of a resource, "Astronomical Algorithms" by Jean Meeus, which may provide further information on the topic.

Areas of Agreement / Disagreement

Participants do not reach a consensus on the best approach to calculating RA and Dec, as the discussion includes multiple perspectives on telescope mounts and tracking options. The conversation remains unresolved regarding specific recommendations for tracking motors and their impact on the calculations.

Contextual Notes

The discussion lacks specific details about the participant's telescope model and the exact calculations they are attempting to perform, which may limit the applicability of the suggestions made.

mathisrad
Messages
20
Reaction score
10
TL;DR
How to find Right ascension and Declination in the night sky from my position.
I've been doing astronomy for Science Olympiad for a few years now and know all the basics about DSOs, HR diagrams, etc. However, I've only recently acquired a telescope since I thought it would be nice to locate some DSOs independently. I understand how RA and D are calculated, but I am not able to do so with respect to my position and telescope angle. Could anybody please tell me how to do this? I would appreciate it.
 
Astronomy news on Phys.org
What type of mount does your telescope have ?
Does it have a tracking motor ?
 
I was thinking about getting a tracking motor, and upgrading my setup in general, would you have any recommendations about a tracking motor?
 
mathisrad said:
I was thinking about getting a tracking motor, and upgrading my setup in general, would you have any recommendations about a tracking motor?
I have no recommendations. It will depend on what make, model, and size of telescope you have. Let us know.
There are others on this site who can help you with that.

If you had an equatorial mount, with a tracking motor, you could set the clock by using the RA of a known star.
You could then move to, and track a DSO, without needing to calculate the azimuth and elevation for your location, from the RA and Dec.
That would also avoid the need to know the exact time, or compute the sidereal time for your observation.
https://en.wikipedia.org/wiki/Sidereal_time

There is a free download of "Astronomical Algorithms" by Jean Meeus.
https://archive.org/details/astronomicalalgorithmsjeanmeeus1991
 
Last edited:
Thanks!
 

Similar threads

  • · Replies 6 ·
Replies
6
Views
5K
  • · Replies 2 ·
Replies
2
Views
3K
  • · Replies 25 ·
Replies
25
Views
3K
Replies
3
Views
13K
  • · Replies 4 ·
Replies
4
Views
7K
  • · Replies 4 ·
Replies
4
Views
4K
  • · Replies 5 ·
Replies
5
Views
4K
  • · Replies 6 ·
Replies
6
Views
2K
  • · Replies 8 ·
Replies
8
Views
1K
  • · Replies 4 ·
Replies
4
Views
3K