[AZ-Observing] Re: McNeil Nebula BVRI field photometry
- From: BillFerris@xxxxxxx
- To: az-observing@xxxxxxxxxxxxx
- Date: Fri, 13 Feb 2004 08:25:13 EST
Thanks, Brian, for sharing the sequence around McNeil's nebula.
As an FYI for the list, the RA can be converted to the traditional
hours:minutes:seconds format by dividing the listed coordinate by 15, then by
multiplying each tenths remainder by 60. For example, the RA of the first star
is listed
as 86.458215. Divided by 15, this becomes 5.763881 hours. Multiplying the
first tenths remainder by 60 (.763881*60) yields 45.83286 minutes. Applying the
tenths conversion to this product's remainder yields 50 seconds. So, the
converted value is 05h 45m 50s, in the hours:minutes:seconds format.
The conversion for the declination coordinate is to multiply the number by
60. Again, using the first star's coordinate as an example: -0.120680*60 =
-7.608. So, the converted value is -00d 07.6m.
Regards,
Bill
=======
Bill Ferris
"Cosmic Voyage: The Online Resource for Amateur Astronomers"
URL: http://www.cosmic-voyage.net
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