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[vsolj-alert 130] V2051 Oph revised chart



V2051 Oph revised chart

 Sumner提供によるVogtのV等級を用いてV2051 Ophの星図の再calibrationを行い
 ました。こちらの等級がより正確と思われます。

Revised chart of V2051 Oph

  V-magnitude chart of V2051 Oph (revised)

  * Re-calibrated using Vogt's V measurements, kindly provided by B. Sumner.

Comment by B. Sumner:

Here is Vogt's sequence for V2051 Oph, published in Publ. VSS RASNZ, 
1980. The reference chart is vsnet 567, 4 March 1996. Karen Meech's 
magnitudes are stated to be of various accuracy in PASP,95,662, but 
they are definetely different to Vogt. Meech's two common magnitudes 
are in brackets (   ).

vsnet           Vogt 
                        V               B-V             U-B       Nights
1048            10.33   0.52    0.11    7
1113=(1117)     10.95   0.61    0.16    1
1202            11.87   0.78    0.28    3
1392=(1387)     13.52   1.93    1.4             2
1411            13.79   1.64    1.9             2
1463            14.13   1.86    1.1             2

You can see why I am suggesting a recalibration, Vogt's magnitudes 
are very different from Meech's. However the fainter stars are very 
red, could this make a difference? The vsnet stars 1411 and 1463 are 
just east of V2051 Oph. 1048 and 1202 are the bright double to the 
west of the variable.

My comment:

   The fainter three stars being very red, I used the brighter three
in re-calibrating the VSNET chart.  The systematic difference for red
stars are mainly caused by the bluer responce of the Ouda V-band
(Meech's data seem to show the similar tendency).  Probably there maybe
less red stars of comparable brighteness suitable for visual observations.

  170819.09  -254830.8    2000 V2051 Oph  UGSU+E         11.8-17.5V
  (position and classification are revised)

----------------------------------------------------------------------
frame DP144792   350 V2051 Oph            V         
date 96  3  3.84996  (V mag)  SCALE 0.02
 1003 27807 1535 0 
 1049 14970 1471 0 
 1200 2737 1548 0 
 1334 21671 1590 0 
 2158 10689 1576 0 
 2007 17816 1642 0 
 2320 14306 1493 0 
 2376 16161 1629 0 
 2497 23760 1528 0 
 2775 9469 1594 0 
 2648 19839 1619 0 
 2939 6517 1599 0 
 3032 10692 1493 0 
 2893 14401 1637 0 
 3096 7389 1664 0 
 3198 14908 1642 0 
 3273 19421 1651 0 
 3556 25909 1457 0 
 3571 11256 1556 0 
 3723 20567 1352 0 
 4176 9745 1495 0 
 4272 6242 1595 0 
 4279 15835 1428 0 
 4367 13225 1422 0 
 4431 17587 1588 0 
 4566 8615 1545 0 
 4487 21780 1596 0 
 4683 7729 1470 0 
 4727 23165 1556 0 
 4947 6683 1624 0 
 5201 14424 1398 0 
 5412 13404 1633 0 
 5460 27077 1533 0 
 5451 4345 1535 0 
 5649 22671 1614 0 
 5893 25849 1501 0 
 6315 5649 1507 0 
 6166 9577 1624 0 
 6595 8613 1656 0 
 6716 26763 1657 0 
 6814 21629 1628 0 
 7078 2748 1642 0 
 7206 15376 1610 0 
 7187 18027 1644 0 
 7488 8780 1668 0 
 7656 16510 1514 0 
 7735 20089 1459 0 
 7825 23813 1583 0 
 7962 24769 1470 0 
 8217 6023 1643 0 
 8397 5321 1575 0 
 8498 9397 1518 0 
 8935 19383 1647 0 
 9370 18345 1097 0 (1095)
 9467 22297 1595 0 
 9280 24403 1597 0 
 9479 27761 1245 0 
 9605 2432 1548 0 
 9750 9325 1447 0 
 10005 8509 1395 0 (1379red)
 10142 25370 1588 0 
 10220 22724 1624 0 
 10305 18902 1431 0 
 10300 23641 1658 0 
 10467 14887 1621 0 
 10681 9184 1553 0 
 10775 5840 1571 0 
 10922 11620 1563 0 
 10974 15826 1454 0 
 10997 28057 1569 0 
 11042 23782 1619 0 
 11149 13239 1590 0 
 11547 24255 1647 0 
 11597 19725 1536 0 
 11715 8421 1656 0 V2051 Oph
 11788 10175 1554 0 
 11824 27860 1447 0 (1413red)
 11772 16269 1605 0 
 12560 12645 1563 0 
 12654 18532 1649 0 
 12540 24376 1358 0 
 13036 6112 1609 0 
 13352 2676 1570 0 
 13422 17707 1587 0 
 13455 21865 1483 0 
 14024 17188 1585 0 
 14027 12727 1376 0 (1352red)
 14149 15809 1569 0 
 14127 27036 1375 0 
 14559 8104 1032 0 (1033)
 14806 11898 1664 0 
 14980 10956 1653 0 
 14932 26645 1308 0 
 15121 4249 1566 0 
 15271 8059 1186 0 (1187)
 15398 24097 1481 0 
 15906 13998 1456 0 
 15782 17391 1562 0 
 15942 23284 1666 0 
 15987 24316 1648 0 
 16133 19544 1556 0 
 16995 20222 1653 0 
 17173 7803 1450 0 
 17289 24320 1487 0 
 17464 14465 1573 0 
 17383 23794 1446 0 
 17686 13644 1519 0 
 17829 9905 1603 0 
 17994 21834 1649 0 
 18560 19715 1656 0 
 18561 8358 1494 0 
 18592 9743 1666 0 
 18702 5152 1492 0 
----------------------------------------------------------------------
  (x    y    mag sat)

  chart viewer for MS-WINDOWS:
    (in http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/viewers)

VSNCHT.ZIP      VSNet star charts manager for MS-Windows.
                Reads, displays, zooms and prints star charts in
                VSNet format (smaller than Postscript).
                Freeware. Version: 1.0  (May 1995)

Author: Rafael Barbera  (GEA - Grup d'Estudis Astronomics)
        rbarb@astro.gea.cesca.es

Where to find the latest version:  
        URL:  http://astro.gea.cesca.es/pub/charts/vsnet

ChtView (in Java 1.1)
        http://ftp.kusastro.kyoto-u.ac.jp/pub/vsnet/viewers/ChtView.tar.gz

also in the "Tools and Programs" section
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