[vsnet-sdor 42] (fwd) eta Carinae

[Taichi Kato <tkato@kusastro.kyoto-u.ac.jp>]

From: "Stan Walker" <astroman@xtra.co.nz>
Date: Fri, 1 Feb 2002 15:43:05 +1300
Subject: [vsnet-chat 5066] eta Carinae

Hi Bish,

The following measure may be of interest.20


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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