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Hi Bish,
The following measure may be of interest.
eta Carinae
2452302.8814 5.154, 0.722, -0.316 (JDH, V, B-V, U-B)
Harry Williams made this on 28 January,
2002, at about 1.8 air masses so there's a little uncertainty but still
within ~0.05 magnitudes. The 60" aperture includes some of the nebulosity so it
compares quite well with those visual observers getting 52 and 53. The slight
reddening continues but I wouldn't trust the U-B transformations at that
altitude. I would have expected it to be 0.1 to 0.2 fainter than this but it
seems to be following a slightly increased rate of brightening over the past 15
years. We hope to get some more measures as it gets higher in the sky.
These may show what's happening.
Regards,
Stan
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