Star data to JSON

gistfile1.cs

using System;
using System.Collections.Generic;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading;
using System.Threading.Tasks;

namespace RADECtoALTAZ
{
    /// <summary>
    /// Parse star data from 9000+ stars magnitude 6.5 and brighter and convert them to the following JSON
    /// [
    ///     { "id" : "1", "RA" : "1.25", "Dec" : "45.2166666666667", "Magnitude" : "6.7" },
    ///     { "id" : "2", "RA" : "1.25", "Dec" : "-0.5", "Magnitude" : "6.2" },
    ///     etc...
    /// ]
    /// Data from the Yale Bright Star Catalogue 
    /// Download from http://tdc-www.harvard.edu/catalogs/bsc5.html bsc5.dat.gz [ASCII catalog]
    /// </summary>
    class StarDataToJson
    {
        public static void Process()
        {
            Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US");
            StreamReader streamReader = new StreamReader("bsc5.dat");
            StreamWriter streamWriter = new StreamWriter("C://stars.json");
            streamWriter.WriteLine("[");

            string line = streamReader.ReadLine();
            while(line != null)
            {
                string nextLine = streamReader.ReadLine();

                try
                {
                    string lineId = line.Substring(0, 4);
                    string lineMagnitude = line.Substring(102, 4);
                    string lineRAh = line.Substring(75, 2);
                    string lineRAm = line.Substring(77, 2);
                    string lineDecPM = line.Substring(83, 1);
                    string lineDech = line.Substring(84, 2);
                    string lineDecm = line.Substring(86, 2);

                    int Id = Convert.ToInt32(lineId.Trim());
                    double magnitude = Convert.ToDouble(lineMagnitude);
                    double RAh = Convert.ToDouble(lineRAh);
                    double RAm = Convert.ToDouble(lineRAm);
                    double RA = (RAh + RAm / 60.0) * 15;
                    double Dech = Convert.ToDouble(lineDech);
                    double Decm = Convert.ToDouble(lineDecm);
                    double Dec = Dech + Decm / 60.0;
                    if (lineDecPM.Equals("-"))
                        Dec *= -1;

                    string jsonLine = "{ \"id\" : \"" + Id + "\", \"RA\" : \"" + RA + "\", \"Dec\" : \"" + Dec + "\", \"Magnitude\" : \"" + magnitude + "\" }";
                    if (nextLine != null)
                        jsonLine += ",";
                    streamWriter.WriteLine(jsonLine);
                }
                catch (Exception e)
                {
                    Console.WriteLine(e.Message);
                }

                line = nextLine;
            }

            streamWriter.WriteLine("]");
            streamWriter.Close();
        }
    }
}