A description of the Hipparcos and Tycho Epoch Photometries is included in this ReadMe; more complete descriptions can be found in the documentation included in the Hipparcos CD-ROMs, in section 2.5 for the Hipparcos Photometry Annexes, and section 2.6 for the Tycho Photometry annexes.

Hipparcos Epoch Photometry for HIP 20491

(ESA Photometry)
 20491| | 0.530| 57| 56      7.2786|0.0007| 7.26| 7.29             |         |C| |  

JD-2440000| Hpmag |s.e. |Tflg
7915.23122| 7.2771|0.009|  2
7915.24551| 7.2801|0.008|  0
7915.32009| 7.2731|0.007|  0
7915.33441| 7.2790|0.008|  0
7915.40897| 7.2649|0.007|  0
7915.42327| 7.2798|0.007|  0
7915.49786| 7.2727|0.007|  0
7931.93752| 7.2722|0.007|  0
7931.95188| 7.2835|0.008|  0
7960.36640| 7.2806|0.007|  0
7960.38074| 7.2842|0.009|  0
7960.54416| 7.2808|0.006|  0
8091.28647| 7.2846|0.007|  0
8091.37536| 7.2834|0.006|  0
8100.87234| 7.2792|0.008|  0
8100.88665| 7.2785|0.007|  0
8101.05016| 7.2817|0.007|  0
8101.06446| 7.2749|0.009|  2
8101.13904| 7.2795|0.008|  0
8101.15334| 7.2731|0.006|  0
8136.06031| 7.2728|0.007|  0
8136.07461| 7.2721|0.006|  0
8136.14921| 7.2799|0.008|  0
8136.16351| 7.2814|0.008|  0
8171.95746| 7.2791|0.007|  0
8171.97178| 7.2734|0.006|  0
8172.04635| 7.2743|0.007|  0
8172.06070| 7.2767|0.008|  0
8178.62444| 7.2737|0.006|  0
8178.63875| 7.2788|0.006|  0
8178.71332| 7.2773|0.007|  0
8178.72764| 7.2795|0.006|  0
8179.08322| 7.2832|0.007|  0
8179.15781| 7.2727|0.006|  0
8179.17212| 7.2838|0.007|  0
8306.96385| 7.2609|0.008|  0
8306.97817| 7.2786|0.007|  0
8307.05273| 7.2631|0.009|  0
8307.06705| 7.2787|0.006|  0
8336.99166| 7.2754|0.008|  0
8337.00597| 7.2772|0.009|  0
8481.86250| 7.2785|0.007|  0
8481.87683| 7.2970|0.014|  0
8508.52167| 7.2892|0.015|  0
8508.53599| 7.2790|0.009|  0
8508.61057| 7.2539|0.011|  0
8654.06075| 7.2587|0.013|  0
8654.22416| 7.2786|0.008|  0
8654.23851| 7.2717|0.007|  0
8675.54891| 7.2762|0.011|  0
8675.56324| 7.2815|0.006|  0
8675.63778| 7.2827|0.008|  0
8675.65211| 7.2412|0.008| 16
8700.15966| 7.2768|0.013|  0
8700.17401| 7.2942|0.010|  0
8700.24855| 7.2680|0.011|  0
8829.16479| 7.2874|0.012|  0