how do we find specific stars.?

Question

we are trying to locate m9, ngc6333 in the ophiuchus globular cluster. how and where should we look in the night sky. we are located in wales uk

Answer 1

The most common system uses is right ascension and declination. Right acension, R.A., is the measure of a star's position along the celestial equator, which is just the earth's equator projected on the stars. Like the prime meridian which is an arbitrarily chosen line from the poles through the Greenwich Observatory in England, 0 R.A. is defined as a line through the constellation Aries. It is expressed in hours, minutes and seconds from this line. Think of it as the longitude of the star's position.

Declination (Dec.) is the measure of a star's position north or south of the celestial equator and is expressed in degrees. Think of it as the latitude of the star's position.

You can pinpoint a star's position by its R.A. and its declination. M9 is at 17h 19m 11s R.A. and -18º 30' 57" Dec. At this time M9 rises at about 1:00 pm your time directly in the southeast. It is near the planet Jupiter. Looking southeast, M9 is just a little to the top left of Jupiter at magnitude 7.8. You will need binoculars or a telescope to see it.

Answer 2

Hello,

(ANS) You would need to get hold of a copy of something like the Norton Star Atlas (lovely book), this gives the specific co-ordinates for objects like M9 & NGC6333 with incredible accuracy.

Objects like M9 & NGC6333 are found by the co-ordinates of degree's in Ascension & Declination.

Your physical location on the ground isnt that important really. What is important however is when (in terms of time) the object M9 or NGC6333 appears over the horizon. And wheather the object is located in the Northern sky or the Southern sky. Obviously if the object of your interest is only found in the southern sky (for example the southern cross) then it may not be visable from Wales UK.

**Time of year can also help determin if an object is visable or not, for example Orion & Sirius (the dog star) wont be visable in the summer sky as the earth is tilted away from that part of the sky. Orion is most visable in the winter months.

Hope that helps?

Best Regards Ivan

Answer 3

M9 / NGC 6333 is located at Right Ascension: 17h 19m 12.0s Declination: -18d 31' 00"

Without a good-sized telescope it's doubtful that you'll be able to find this object.

Answer 4

RA, 17 19 11.
Declination, -18 30 59

Answer 5

You'll need to look in the wee small hours at this time of year, sometime between 02:00 and 05:00 (local time), and you'll need a good view to the south. You'll need a decent 'scope to resolve individual stars, but the cluster itself is visible in 10x50 binoculars.

Answer 6

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Answer 7

You need a map. Try the source.