OGLE-2012-NOVA-002: UBVRI follow up at the Swope 1m Telescope
ATel #4487; R. Angeloni (Pontificia Universidad Catolica de Chile), L. Wyrzykowski (Warsaw University Astronomical Observatory, Poland) & S. Koposov (Institute of Astronomy, Cambridge)
on 16 Oct 2012; 02:20 UT
Credential Certification: Lukasz Wyrzykowski (wyrzykow@ast.cam.ac.uk)
In response to the call for follow-up observations of the candidate classical nova OGLE-2012-NOVA-002 (ATel#4483), we have performed UBVRI photometry with the Swope 1m Telescope at the Las Campanas Observatory on 2012-10-14.
The negative colors both in the blue and red part of the optical region let us speculate that the nova might be just going through the transition phase from optically thick to optically thin conditions in the ejecta. In this sense, the blue negative color could be the signal of energy conversion from the hot star to the nebular emission, while the negative V-I might point to the onset of a dust formation episode.
Timely spectroscopic observations and simultaneous UV/optical/IR photometry would be extremely useful in assessing the intrinsic nature of this candidate nova in SMC.
Here below the (unreddened) calibrated magnitudes:
Date 2012-10-14
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U = 14.9 +-0.1 at UT 07:02
B = 15.92+-0.02 at UT 06:23
V = 16.31+-0.01 at UT 05:42
R = 16.09+-0.01 at UT 07:39
I = 16.35+-0.01 at UT 05:07
U-B = -1.0
B-V = -0.39
V-R = 0.22
V-I = -0.04
The photometric calibrations were obtained using the Cambridge Photometric Calibration Server (CPCS), which used data from APASS, OGLE and Zaritsky (2002) photometric catalogs. More info on CPCS: http://www.ast.cam.ac.uk/ioa/wikis/gsawgwiki/index.php/Follow-up
