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Post Info TOPIC: NGC 6631
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NGC 6631
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NGC 6631 (also ESO 183-21, IRAS 18477-5722 and OCL 59) is a magnitude +11.7 open star cluster located 8800 ±405 light-years away in the constellation Scutum.

The cluster was discovered by British astronomer John Herschel using a 47.5 cm (18.7 inch) f/13 speculum reflecting telescope at the Cape of Good Hope on the 12th July 1836. 

Right Ascension 18h 27m 09.5s, Declination -12° 01' 35"



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Title: CCD BVRI and 2MASS Photometry of the Poorly Studied Open Cluster NGC 6631
Author: A. L. Tadross, R. Bendary, H. Priya, A. Essam, A. Osman

Here we have obtained the BVRI CCD photometry down to a limiting magnitude of V~ 20 for the southern poorly studied open cluster NGC 6631. It is observed from the 1.88 m Telescope of Kottamia Observatory in Egypt. About 3300 stars have been observed in an area of ~10'x10' around the cluster center. The main photometric parameters have been estimated and compared with the results that determined for the cluster using JHKs 2MASS photometric database. The cluster's diameter is estimated to be 10 arcmin; the reddening E(B-V)= 0.68 ± 0.10 mag, E(J-H)= 0.21 ± 0.10 mag, the true modulus (m-M)o= 12.16 ± 0.10 mag, which corresponds to a distance of 2700 ±125 pc and age of 500 ± 50 Myr.

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