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[vsnet-sequence 70] Re: TU Crt chart
Some comments on the chart and sequence selection:
The minimum of this DN is far fainter than 15.3. Possibly "<" was omitted on the SXN chart.
One selected comparison star is too red for proper comparison, pe star 5 in the list. There is a 12.5 star a bit SW of the latter, which I've put on my chart. I have no details about it now, but it ought to be more bluish.
I think these on-line charts are a laudable and successfull initiative!
Regards,
Berto Monard
>>> "Mike Simonsen" <mikesimonsen@mindspring.com> 04/09/01 11:28PM >>>
A chart for TU Crt based on Henden photometry and sequence by Sumner is
available at
http://joevp.20m.com/cgi-bin/i/charts/hscharts/South_up/Crt_TU_sxn.gif
Sequence attached below.
Regards,
Mike Simonsen
-------------------------------------------------------
108 TU CRATERIS (UGSU) Range: 12.1-17.5B
Position: 11 03 36.61 -21 37 45.7 (J2000, from .dat file)
Magnitude: V=15.471 B-V=0.068 (in .dat file)
ID RA (2000) DEC X Y N V ERR B-V ERR
a) Comparison star sequence
1 11 03 36.6 -21 34 20 1 206 2 9.770 0.007 1.021 0.008
2 11 03 26.6 -21 38 24 -139 -38 5 10.404 0.321 0.571 0.053
3 11 03 21.4 -21 32 52 -212 294 5 11.011 0.168 0.419 0.030
4 11 03 15.1 -21 39 20 -300 -94 5 11.482 0.060 0.634 0.030
5 11 03 03.0 -21 41 22 -469 -216 1 12.157 0.002 1.129 0.003
6 11 03 02.0 -21 37 58 -483 -12 1 13.653 0.004 0.594 0.006
7 11 03 50.1 -21 35 01 189 165 4 14.126 0.011 0.960 0.011
8 11 03 16.4 -21 34 32 -282 194 4 14.468 0.021 0.678 0.002
9 11 03 19.4 -21 39 48 -239 -122 5 14.790 0.018 0.554 0.009
10 11 03 33.3 -21 35 07 -46 159 4 15.123 0.009 0.964 0.016
11 11 03 42.0 -21 36 27 75 79 4 15.349 0.014 0.702 0.010
12 11 03 37.7 -21 35 44 16 122 4 15.647 0.014 0.631 0.008
13 11 03 42.2 -21 37 36 78 10 4 16.085 0.000 1.042 0.013
14 11 03 32.2 -21 37 25 -61 21 4 17.235 0.051 1.217 0.060
15 11 03 46.3 -21 39 27 136 -101 4 17.715 0.020 0.893 0.031
b) Wide-colour extension for CCD calibration
11 03 23.4 -21 43 17 -184 -331 1 14.619 0.007 0.582 0.010
11 03 50.0 -21 34 05 187 221 4 15.219 0.013 0.617 0.013
11 03 10.5 -21 41 37 -364 -230 1 14.504 0.006 1.349 0.013
11 03 17.5 -21 37 08 -266 38 5 16.273 0.016 1.488 0.071
Notes:
1. Stars #1, #2, #3 and #4 are saturated. Their magnitudes and
colours are approximate. However two of them do do have reliable
Tycho-2 magnitudes, as follows: star #1 V=9.10+/-0.03 and star #2
V=10.02+/-0.06. The other two have less reliable Tycho-2 magnitudes:
#3 V=10.71+/-0.10 and star #4 V=11.55+/-0.18. For a visual sequence
use v=107 and v=115 for these two stars.
2. There is a VSS RASNZ chart available, No. 1131 dated 1995, with
comparison star letters. Four RASNZ lettered star, 'c', 'f', 'k' and
'o' are not used in this sequence, and 'h' and 'm' were not measured.
ID Henden RASNZ Tycho-2
V B-V V B-V
1 9.770 1.021 a 9.10 1.35
2 10.404 0.571 b 10.03 0.60
10.800 0.403 f 11.24 0.74
3 11.011 0.419 d 10.71 0.54
11.250 1.150 c 10.70 0.55
4 11.482 0.634 e 11.55 0.31
5 12.157 1.129 g
6 13.653 0.594 l
7 14.126 0.960 n
14.884 0.685 o
10 15.123 0.964 p
11 15.349 0.702 q
15.521 1.246 k
Bruce Sumner
Revised 31 July 1999
Second revision 1 April 2001
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