[vsnet-alert 1346] V sequence for PKS 2155-304

[Mati Morel <morel@ozemail.com.au>]

Hi all,
In view of the call for visual monitoring of PKS 2155-304 (=H 2154-304) I have
found a sequence of accurate V magnitudes for this Blazar, by Smith, Januzzi and
Elston (Astrophysical J. Suppl. 77:67-73, 1991 September). They list three 
comparison stars, all of them proving to have GSC numbers, as well as the
Blazar itself.  The data is given below.

Comp.  GSC #           (J2000)            V     B-V
=======================================================
2    7488.00340   21:59:02.4 -30:10:46   12.04  0.69
3    7488.00775   21:59:05.2 -30:10:51   12.97  0.92
C    7488.00791   21:58:46.4 -30:17:52   12.61  0.58

PKS 2155-304 = H2154-304 = GSC 7488.01302
                  21:58:52.0 -30:13:32


A REQUEST:
++++++++++
PKS 2155-304 appears to be a fairly bright (southern) BL Lac object. 
Are there any other similar southern examples, and comparison 
sequences?  I have a number of sequences for (mainly) northern
objects.
It would be very helpful if someone could post a list of the brighter
BL Lac objects (northern and southern). An indication as to where
comparison sequences may be found would also be very helpful.

For example the other BL Lac object mentioned by Berto, 2005-489,
appears to be within range of visual observers, but I have no 
information on it, nor whether a good sequence exists.

The Smith et al paper targets 38 X-ray selected BL Lac objects.
There must be others, not necessarily X-ray emitters???








 
















/Mati

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