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curator:Tim Erickson
The Pleiades

[Pleiades image]Data on the region of sky in which the Pleides star cluster appears.

Attributes:
V apparent visual magnitude (in the "V" band. Remember, smaller is brighter)
RA right ascension in degrees (celestial longitude)
DEC declination in degrees (latitude)
parallax is in milliarcseconds
PM_RA is proper motion in the RA direction, milliarcseconds per year
PM_DEC is proper motion in the DEC direction, milliarcseconds per year
B_V is color index B–V in magnitudes (larger is redder, smaller is bluer)
V_I is color index V–I in magnitudes (larger is redder, smaller is bluer)
cluster is "Pleiades"

Which stars are actually members of the cluster (as opposed to stars that happen to be in the same line of sight)? How can you use data to tell?

Using the stars in the cluster, make a color-magnitude diagram. Find the main sequence.

Go to the Web and find a picture of the Pleiades, especially a color picture. See if your colors correspond with the ones in the picture. Remember that right ascension will be backwards :)

Source:
Data from the Hipparcos satellite web site http://astro.estec.esa.nl/Hipparcos/hipparcos.html
actually includes photometric data from Tycho as well
(downloaded by Tim Erickson, July 2003)

VRADEC parallax PM_RA PM_DEC B_VV_Icluster
8.453.739826.60837.746.275.060.3360.39Pleiades
8.5653.83526.85025.2229.96-32.320.70.51Pleiades
8.6753.838826.85285.2229.96-32.320.5680.64Pleiades
9.8653.88222.82379.9823.92-44.120.540.61Pleiades
9.0253.999923.91413.83.64-6.841.3371.3Pleiades
9.2754.081925.3995.0323.07-11.480.4050.47Pleiades
8.6254.119923.797515.6653-103.720.6690.73Pleiades
8.8954.12621.78022.79-0.626.011.0541.02Pleiades
6.7254.241823.21117.46-15.42-18.360.1230.14Pleiades
7.2854.295325.991826.78237.51-271.850.7040.75Pleiades
9.3554.395421.343225.23141.55-27.390.9170.96Pleiades
10.0954.59422.49985.8620.33-43.050.6340.7Pleiades
8.2254.649624.60178.212.06-23.320.4280.5Pleiades
6.7154.669622.65977.8819.34-45.29-0.0010.02Pleiades
10.5354.736924.56993.222.71-43.360.6450.71Pleiades
7.1154.77824.7036.8721.36-46.010.0390.05Pleiades
9.0754.780925.15683.626.76-15.920.2240.25Pleiades
7.2754.80521.84347.7821.89-41.60.0680.08Pleiades
10.454.806124.46668.8520.2-45.090.6160.68Pleiades
9.9454.921523.2919.9723.15-46.140.6080.68Pleiades
8.3355.041526.96063.48116.4-87.921.0461.1Pleiades
8.2355.05826.88751.871.41-4.830.2690.3Pleiades
7.1655.089921.405711.88-31.626.780.3110.36Pleiades
6.1155.192925.32956.249.58-13.950.0970.11Pleiades
8.96     1.30.41Pleiades
9.1755.345623.4879.2122.49-44.320.4370.51Pleiades
10.155.400625.61945.9114.95-46.420.5890.66Pleiades
9.1755.519622.85877.2919.7-41.660.4630.53Pleiades
7.455.566322.786618.7921.57-75.50.4280.5Pleiades
9.8555.599921.47366.2824.13-47.880.550.62Pleiades
10.455.600122.42126.6619.29-44.430.70.75Pleiades
8.1355.623826.57231.4670.33-47.541.3411.31Pleiades
7.9155.671521.28168.022.544.070.6240.69Pleiades
7.9355.92323.64939.4820.36-45.10.3470.41Pleiades
7.5255.929925.080810.0121.79-53.430.1410.16Pleiades
7.3555.941826.38124.04-12.21-12.371.161.12Pleiades
5.4556.200824.28969.7520.73-44-0.0340.01Pleiades
8.9856.213423.2699.7622.71-43.670.4030.47Pleiades
3.7256.218824.11348.821.55-44.92-0.105-0.09Pleiades
9.4956.245522.03261018.31-42.760.4890.56Pleiades
11.4956.284126.292613.3516.59-49.340.8230.86Pleiades
5.6656.290524.83948.8719.03-46.64-0.064-0.03Pleiades
4.356.30224.46748.7519.35-41.63-0.11-0.08Pleiades
7.7556.383221.246811.2119.02-47.650.1790.2Pleiades
6.8556.453323.14739.6821.06-44.490.060.07Pleiades
3.8756.456624.36799.0621.09-45.03-0.063-0.02Pleiades
5.7656.476924.55468.4319.44-45.36-0.0360.02Pleiades
8.0456.496425.39878.518.88-46.40.2130.24Pleiades
6.4356.51224.5289.2119.83-44.38-0.020.02Pleiades
9.4656.520321.998813.58-125.75-139.380.6760.74Pleiades
4.1456.581523.94859.0821.17-42.67-0.0510.02Pleiades
9.6156.582926.21668.62386.94-198.161.4371.77Pleiades
8.7256.645125.8444.7320.07-46.070.3550.42Pleiades
6.8356.747424.52026.6621.47-45.430.0210.04Pleiades
6.9856.821523.726816.1-34.04-25.390.5420.62Pleiades
6.9956.837323.80358.3519.78-43.970.030.05Pleiades
8.1756.845422.92229.8719.74-45.20.2550.29Pleiades
2.8556.871124.10528.8719.35-43.11-0.086-0.01Pleiades
6.8356.872724.28859.0517.84-44.940.0660.08Pleiades
8.3256.945125.38587.6119.34-46.910.2620.29Pleiades
6.4457.027324.98854.42-27.81-28.151.7011.71Pleiades
7.9757.044121.329111.94-6.77-13.960.2310.26Pleiades
7.9857.07926.58924.53-31.44-3.931.151.11Pleiades
5.4457.086723.42149.6419.14-46.8-0.067-0.01Pleiades
6.9657.125324.34566.917.7-43.20.1280.14Pleiades
8.4457.174625.80082.54-1.48-5.120.110.12Pleiades
8.1257.227922.79925.276.48-5.790.050.06Pleiades
6.4757.237123.857313.4446.92-56.450.3770.44Pleiades
8.1157.250921.342210.02-11.790.590.5280.6Pleiades
3.6257.290524.05358.5717.77-44.7-0.07-0.03Pleiades
5.0557.296724.13688.4218.71-46.74-0.082-0.06Pleiades
6.6257.340624.38118.0218.34-44.53-0.027-0.02Pleiades
7.0157.40922.533610.1217.8-450.0330.05Pleiades
6.1757.431323.7128.5816.5-44.53-0.046-0.02Pleiades
6.0557.479422.244310.1423.88-45.9-0.0060.05Pleiades
6.7357.491823.84886.318.74-44.350.0630.07Pleiades
7.2957.51422.591826.91155.06-63.560.5380.61Pleiades
5.2457.578825.579616.9636.37-117.950.2310.26Pleiades
6.9557.718423.96169.8316.8-45.760.0780.09Pleiades
10.1757.762623.903824.72150.93-46.611.161.12Pleiades
11.2     0.550.62Pleiades
6.7957.855425.1634.76-8.97-11.50.160.18Pleiades
8.8657.863324.51887.5620.19-45.360.380.44Pleiades
6.7157.902622.03148.6416.16-30.541.121.15Pleiades
7.5758.022822.672537.25207-340.950.6840.74Pleiades
6.7758.047825.163525.34-121.53-163.780.5830.65Pleiades
10.4458.20126.36634.9126.07-28.190.630.7Pleiades
9.4458.222824.71588.5715.43-45.830.480.55Pleiades
858.24726.678811.45106.94-123.030.6440.71Pleiades
10.2458.307125.75614.169.17-16.890.210.23Pleiades
8.2958.338223.12363.687.695.121.541.59Pleiades
7.8458.383425.737.29-3.74-22.080.240.27Pleiades
6.3558.393625.6836.8221.06-34.220.110.12Pleiades
7.4858.459626.89591.35-0.71-8.721.0491.02Pleiades
10.9458.605124.36026.6420.29-48.980.7140.76Pleiades
10.9658.615921.389910.2619.84-41.690.7370.78Pleiades
10.7958.63925.532510.112.84-36.940.7490.79Pleiades
7.9558.685723.20163.251.35-9.140.0480.06Pleiades
8.0658.778827.06462.494.29-7.551.0481.02Pleiades
8.458.830823.36048.6169.97-9.281.010.99Pleiades
10.15     1.261.43Pleiades
11.85     0.430.5Pleiades
8.3459.117123.15048.6616.99-47.060.2690.3Pleiades
7.8459.119222.67521.41174.27-233.120.6880.75Pleiades
8.7659.129926.74296.1172.41-61.550.5010.57Pleiades
9.5359.165421.95776.7842.2-40.720.4690.54Pleiades
5.6259.216822.478322.3169.43-114.820.3450.4Pleiades
6.0559.265823.17566.148.95-16.980.0310.05Pleiades
6.8459.29721.32368.01-6.4-12.781.031Pleiades
7.559.299325.28283.98-0.428.651.0221Pleiades
8.9659.34921.55388.849.6-43.240.6250.69Pleiades
6.1959.359924.4623.04-5.99-7.331.3721.2Pleiades
8.7859.446622.924427.72157.3411  Pleiades
7.2159.58724.08125.0817.54-44.240.0350.05Pleiades

<text form of the data>

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Last updated February 14, 2007
supported by NSF award DMI-0216656