NGC 4147 / C1207+188 (Updated November 2011) RA: 12:10:06.30 DEC: +18:32:33.5 (J2000) ============================================================ Bytes Format Explanation 1-8 A8 Star ID 10-32 A11,1x,A11 Position 34-35 A2 Units for position R0 denotes RA, DEC in the J2000 coordinates R5 denotes RA, DEC in the 1950 coordinates XA denotes X, Y in arcseconds XP denotes X, Y in pixels 37-44 F8.4 Period (days) 46-51 F6.3 Mean magnitude (or maximum magnitude if "max" is indicated in the remarks column) 53-57 F5.3 Light amplitude (range of variability) 59 A1 Colour for mean magnitude and amplitude e.g. B, V, R, I, J, K or P (for photographic). 61-65 A5 Type of variable (draft 2006 GCVS classifications) CST denotes non variable stars previously designated as variables 67-80 A19 Notes and Remarks (f denotes field star) "--" or "----" indicates no data available ========================================================================= ID Position Period ampl C Type Notes/ RA/X Dec/Y Units Remarks ========================================================================= 1 12:09:59.38 +18:31:48.4 R0 0.5004 17.00 1.15 V RR0 2 12:10:04.96 +18:32:04.5 R0 0.4932 17.03 1.02 V RR0 3 12:10:04.38 +18:31:58.4 R0 0.2805 17.00 0.51 V RR1 4 12:10:06.39 +18:32:50.1 R0 0.3000 16.97 0.45 V RR1 5 12:10:07.38 +18:32:35.1 R0 ---- -- -- CST 6 12:10:08.51 +18:33:00.0 R0 0.6097 16.92 0.85 V RR0 7 12:10:06.66 +18:32:39.7 R0 0.5142 16.80 1.06 V RR0 8 12:10:06.95 +18:32:34.8 R0 0.2787 16.86 0.40 V RR1 9 12:10:08.24 +18:32:59.7 R0 ---- -- -- CST 10 12:10:03.74 +18:31:48.4 R0 0.3523 16.99 0.40 V RR1 11 12:10:05.53 +18:31:51.8 R0 0.3874 16.86 0.41 V RR1 12 12:10:06.70 +18:32:28.4 R0 0.5047 16.80 1.12 V RR0 13 12:10:06.37 +18:32:14.1 R0 0.4083 16.66 0.45 V RR1 14 12:10:06.94 +18:32:32.4 R0 0.3564 16.94 0.37 V RR1 15 12:10:07.00 +18:32:24.8 R0 ---- -- -- CST 16 12:10:07.35 +18:32:40.1 R0 0.3723 16.57 0.21 V RR1 17 12:10:10.67 +18:34:51.2 R0 0.3712 16.93 0.34 V RR1 18 12:10:05.63 +18:32:11.6 R0 ---- -- -- CST 19 12:10:21.98 +18:35:02.0 R0 0.2739 17.03 0.28 V RR1 ========================================================================= Supplementary Notes RA, dec, magnitudes, amplitudes and variability types from Stetson et al. (2005). NGC 4147 might be connected with the Sgr dwarf galaxy, but according to Jordi & Grebel (2010), there is still some debate about this. ===================================================================== Discovery of the Variable Stars in NGC 4147: V1-3 Baade (1930) with x,y positions and ID chart V4 Davis (1917) with x,y position V5-14 Sandage & Walker (1955) and/or Newburn (1957) with ID charts for V1-V14 published by Sandage & Walker V15-17 and non-variable status for V9 Newburn (1957): V15-17 were labelled as IV-37, I-34 and I-6 by Sandage & Walker (1955) V18 a possible foreground (field) RR0 and non-variable status of V5, 9 and 15 Arellano Ferro et al. (2004) with ID chart for V18 V19 and non-variable status of V5, 9, 15 and 18 Stetson et al. (2005) with RA, Dec and ID chart for V19 ======================================================================== References Arellano Ferro, A., Arevalo, M. J., Lazaro, C., Rey, M., Bramich, D. M., Giridhar, S. 2004, RMxAA, 40, 209 Baade, W. 1930, A.N., 239, 353 Davis, H. 1917, PASP, 29, 260 Jordi, K. & Grebel, E. K. 2010, A&A, 522, A71 Newburn, R. L. 1957, AJ, 62, 197 Sandage, A. R. & Walker, M. F. 1955, AJ, 60, 230 Stetson, P. B., Catelan, M., Smith, H. A. 2005, PASP, 117, 1325