1. Not finding help here? Sign up for a free 30min tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Rate of Right Ascension

  1. Jan 28, 2016 #1
    1. The problem statement, all variables and given/known data
    This is an Astrometry problem. I am not sure or how exactly to proceed:



    Data:

    First off, I am unsure which data points to use. Should I use the values from right ascension or the values from the time index.

    1 hour = 15 degrees
    24 hours = 360 degrees

    Image 01 Right Ascension: 23:03:53.99
    Image 02 Right Ascension: 23:03:49.17

    Image 01 RA - Image 02 RA = 23:03:53.99 -23:03:49.17 = 00:00:04.82

    Image 01 Time Index: 12:16:58 UTC
    Image 02 Time Index: 4:39:04 UTC

    Image 01 Time Index - Image 02 Time Index = 4 hours 56 minutes 2 seconds = 17,762 seconds

    Question:
    Calculate the rates of motion in Right Ascension (seconds/hour) of the asteroid:

    2. Relevant equations
    Rate = Distance/Time

    3. The attempt at a solution

    With values from Right Ascension

    4.82 sec/ 15 degrees = 0.32133 (3 repeats) sec/deg

    OR

    With values from Time Index
    17,762 sec/ 15 degrees = 1184.13 (3 repeats) sec/deg
     
  2. jcsd
  3. Jan 28, 2016 #2

    SteamKing

    User Avatar
    Staff Emeritus
    Science Advisor
    Homework Helper

    You're supposed to calculate the rates in sec of arc/hour, which is not the same units as sec (of time) / deg.
     
  4. Jan 28, 2016 #3
    Thank you for the response SteamKing.

    I'm not sure I understand. Can you expand on that? I'm also confused on which value I am supposed to use - the Right Ascension value or the rime index value?
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Have something to add?
Draft saved Draft deleted



Similar Discussions: Rate of Right Ascension
  1. Rate of heat (Replies: 1)

  2. Rate of Decay (Replies: 5)

  3. Detection Rate (Replies: 9)

Loading...