Calculating the optimal day to observe an object given the RA and dec

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In summary, the optimal day to observe the OmegaCen Globular Cluster is 20.75 days after the vernal equinox, which is estimated to be on April 10.75th or potentially April 11th, depending on the time zone.
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pondzo
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Homework Statement



OmegaCen is a Globular Cluster which lies at coordinates: R.A. = 13h26m45.89s,
Dec = −47°28′36.7′′ (J2000.0) estimate the optimal day on which to observe
this object.

Homework Equations





The Attempt at a Solution



We are to interpret optimal as 12 am midnight directly overhead

since this is 12 hrs after noon you subtract 12hrs RA = 1hr26m45.89sec
which is ≈ 1.446 hrs RA and this is due to the monthly RA shift
2 hrs of RA shift per month so, 30/1.446 ≈ 20.75 days
so 20.75 days after the vernal equinox, which is april the 10.75 th
im not quite sure how to interpret the 10.75, do i say its on the 10th of april or the 11th ? and the observation is meant to be at 12 am midnight so would you say its on the 11th april? (at the very beginning). Thank you!
 
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The vernal equinox probably won't happen exactly at midnight, but that depends on the time zone... April 11th should be fine.

(see https://www.physicsforums.com/threads/read-me-how-to-use-this-forum.855656/ why you suddenly get an answer for an old thread)
 
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FAQ: Calculating the optimal day to observe an object given the RA and dec

How do I calculate the optimal day to observe an object given the right ascension (RA) and declination (dec)?

In order to calculate the optimal day to observe an object based on its RA and dec, you will need to use a combination of astronomical equations and software tools. One commonly used equation is the hour angle, which takes into account the Earth's rotation and the object's position in the sky. You can also use online tools such as the Stellarium software or the SkyView Virtual Telescope to get accurate and up-to-date information on the best time to observe your desired object.

Can the optimal day to observe an object change depending on its RA and dec?

Yes, the optimal day to observe an object can vary based on its RA and dec. This is because the Earth's rotation and the object's position in the sky are constantly changing, which can affect the visibility and accessibility of the object. For example, an object with a high declination may be best observed in the summer months, while an object with a low declination may be better observed in the winter months.

What factors should I consider when calculating the optimal day to observe an object?

When determining the optimal day to observe an object, there are several factors to consider. These include the object's RA and dec, the time of year, the weather conditions, and the visibility of the object in your location. It is also important to consider the moon phase and its brightness, as this can affect the visibility and quality of your observations.

Is it possible to observe an object on any day, regardless of its RA and dec?

In theory, it is possible to observe an object on any day. However, the quality and visibility of your observations may vary depending on the object's RA and dec, as well as other factors such as weather conditions and light pollution. It is always best to plan your observations based on the optimal day and time to ensure the best possible results.

How accurate are the calculations for the optimal day to observe an object?

The accuracy of the calculations for the optimal day to observe an object can vary depending on the tools and equations used. Generally, using multiple sources and taking into account various factors such as the Earth's rotation and weather conditions can improve the accuracy of your calculations. It is also important to regularly check for updates and changes in the object's position and visibility to ensure the most accurate results.

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