[vsnet-chat 2644] NSV4223 Pyxidis

["Andrew Pearce" <arpearce@ozemail.com.au>]

I have been observing the suspected variable NSV4223 in Pyxis over the last 40
days or so.  During this time I have detected quite a large drop in brightness
amounting to nearly 3 magnitudes as indicated in the observations below:

JD                            Mag

2451541.2938            10.4
2451544.2813            10.4
2451547.2674            10.4
2451576.2639            11.9
2451577.2604            12.3
2451579.2674            13.0
2451580.2882            13.0
2451581.2611            13.2

The VSS of RASNZ has a chart for this star (Chart No. 1122) with letter
designation for comparison stars as a proper sequence is not available.  I have
assigned magnitudes to these stars based on the Tycho Johnson V mags for the
brighter stars and GSC mags for stars fainter than 11th mag.  The GSC magnitudes
appear to be suspect with most of them appearing to be on the faint side of what
the comparison stars actually appear.

In any case it appears that the object's variability is beyond question.  I note
that it's spectral type is listed as SE.

I would be interested to hear if anyone else has observed this star and if there
are any reports on the type of star it actually is.

I will keep on observing the star, and I urge others to as well, so we can get a
better idea of it's light curve.

Regards
Andrew Pearce
Western Australia

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