Quick question about negative declinations

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SUMMARY

The discussion centers on the interpretation of declination angles for asteroids, specifically addressing the confusion surrounding negative declination values. Users clarify that Right Ascension (RA) is measured in hours (0 to 24), while Declination (DEC) is measured in degrees (from -90 to +90). The mention of declination angles ranging from 0 to -24 hours is incorrect, as declination should not be expressed in hours. This distinction is crucial for accurately determining the sky position of celestial objects.

PREREQUISITES
  • Understanding of celestial coordinate systems, specifically Right Ascension (RA) and Declination (DEC).
  • Familiarity with astronomical observation techniques using telescopes.
  • Basic knowledge of angular measurements in degrees, minutes, and seconds.
  • Experience with online astronomical tools, such as the Harvard-CFA ephemeris calculator.
NEXT STEPS
  • Research the differences between Right Ascension and Declination in celestial navigation.
  • Learn how to use the Harvard-CFA ephemeris calculator for asteroid observations.
  • Study the concept of celestial coordinates and their application in astronomy.
  • Explore the methods for converting between different units of angular measurement.
USEFUL FOR

Astronomy enthusiasts, amateur astronomers, and anyone involved in celestial navigation or asteroid observation will benefit from this discussion.

BOYLANATOR
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I am trying to find the sky position of asteroids so that I can observe them using a telescope.
This site quotes the declination angle in hours and appears to range from 0 to -24. I have never heard of a declination angle more negative than -12 hours.
What does this mean?
http://scully.cfa.harvard.edu/cgi-bin/mpeph2.cgi
 
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BOYLANATOR said:
I am trying to find the sky position of asteroids so that I can observe them using a telescope.
This site quotes the declination angle in hours and appears to range from 0 to -24. I have never heard of a declination angle more negative than -12 hours.
What does this mean?
http://scully.cfa.harvard.edu/cgi-bin/mpeph2.cgi

You web link doesn't appear to work.
 
BOYLANATOR said:
I am trying to find the sky position of asteroids so that I can observe them using a telescope.
This site quotes the declination angle in hours and appears to range from 0 to -24. I have never heard of a declination angle more negative than -12 hours.
What does this mean?
http://scully.cfa.harvard.edu/cgi-bin/mpeph2.cgi

thats incorrect

RA = Right Ascention is in hours minutes and seconds 0 - 24Hrs

DEC = Declination is in degrees minutes and seconds 0 deg at celestial equator going to + and - 90 degrees

Dave
 

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