Near-IR photometric monitoring observations of Nova Oph 2012
ATel #5090; W. P. Varricatt, T. Carroll, J. Ehle, T. Wold (Joint Astronomy Centre, Hilo, HI, USA)
on 27 May 2013; 20:08 UT
Credential Certification: Watson Varricatt (w.varricatt@jach.hawaii.edu)
Subjects: Infra-Red, Cataclysmic Variable, Nova
We report on our near-IR photometric monitoring observations of Nova Oph 2012 (PNV J17260708-2551454) from 2012 May to 2013 April. The observations were performed with the 3.8-m United Kingdom Infrared Telescope (UKIRT) and the UKIRT Wide Field Camera (WFCAM), using the near-IR filters Z, Y, J, H and K (effective wavelengths: 0.8717, 1.0305, 1.2483, 1.6313 and 2.2010 microns respectively).
Nova Oph 2012 was discovered on 2012 March 25.8 (CBET #3072). Further observations at radio, infrared, visual, UV and X-ray wavelengths were reported in AAN #457, ATel #4027, #4055 and #4087, and CBET #3081 and #3103. Spectroscopy at 0.8-2.4-micron wavelengths by Rudy et al. (2012; CBET #3081) showed that the this object is an "Fe II"-type nova.
The details of our observations, and the magnitudes derived (in the UKIRT photometric system), are given in the table below. The object is highly reddened; our observations show a slow decline of the near-IR magnitudes, when compared with those obtained in March-April, 2012 by Raj et al. (2012; ATel #4027). The decline is not smooth, and exhibits periods of re-brightening.
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UTDATE | UT | Heliocentric |Filt.| mag. | error
yyyymmdd | hh:mm:ss | Julian Date | | |
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20120501 | 14:08:58 | 2456049.093918 | Y | 9.158 | 0.010
20120502 | 13:57:56 | 2456050.086319 | Z | 8.974 | 0.010
20120502 | 13:59:22 | 2456050.087314 | Y | 9.111 | 0.010
20120514 | 11:41:52 | 2456061.992479 | Z | 8.897 | 0.010
20120514 | 11:43:18 | 2456061.993475 | Y | 9.033 | 0.010
20120521 | 12:47:59 | 2456069.038683 | Z | 9.401 | 0.010
20120521 | 12:48:56 | 2456069.039343 | Y | 9.600 | 0.010
20120522 | 10:50:12 | 2456069.956915 | Z | 9.696 | 0.010
20120522 | 10:51:35 | 2456069.957882 | Y | 9.888 | 0.010
20120522 | 10:52:58 | 2456069.958843 | J | 9.459 | 0.010
20120522 | 10:54:22 | 2456069.959815 | H | 9.237 | 0.010
20120522 | 10:55:47 | 2456069.960799 | K | 8.537 | 0.010
20120615 | 11:11:55 | 2456093.972374 | Z | 9.542 | 0.010
20120615 | 11:13:45 | 2456093.973647 | Y | 9.578 | 0.010
20120628 | 09:35:47 | 2456106.905434 | Z | 11.047 | 0.010
20120628 | 09:37:12 | 2456106.906418 | Y | 10.882 | 0.010
20120628 | 09:38:37 | 2456106.907402 | J | 9.882 | 0.010
20120906 | 06:16:50 | 2456176.762541 | Y | 17.420 | 0.151
20120911 | 05:06:33 | 2456181.713252 | Y | 17.283 | 0.055
20120911 | 05:08:56 | 2456181.714907 | J | 16.865 | 0.059
20120911 | 05:11:00 | 2456181.716342 | H | 12.682 | 0.010
20120929 | 05:27:20 | 2456199.725926 | H | 12.544 | 0.017
20120929 | 05:29:00 | 2456199.727083 | K | 9.127 | 0.027
20121001 | 04:56:32 | 2456201.704348 | J | 16.449 | 0.047
20121001 | 04:58:33 | 2456201.705748 | H | 12.474 | 0.018
20121001 | 05:00:11 | 2456201.706883 | K | 9.191 | 0.023
20130329 | 15:28:05 | 2456381.146145 | Z | 17.028 | 0.037
20130329 | 15:30:28 | 2456381.147801 | Y | 15.784 | 0.016
20130329 | 15:32:53 | 2456381.149479 | J | 15.092 | 0.013
20130329 | 15:34:58 | 2456381.150926 | H | 12.752 | 0.010
20130329 | 15:36:41 | 2456381.152118 | K | 10.180 | 0.010
20130409 | 12:12:32 | 2456392.011345 | Z | 16.971 | 0.020
20130409 | 12:14:58 | 2456392.013035 | Y | 15.844 | 0.010
20130409 | 12:17:22 | 2456392.014702 | J | 15.133 | 0.010
20130409 | 12:19:26 | 2456392.016137 | H | 12.935 | 0.010
20130409 | 12:21:05 | 2456392.017283 | K | 10.414 | 0.010
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UKIRT is operated by the Joint Astronomy Centre on behalf of the UK-STFC. The data reduction was performed by the Cambridge Astronomy Survey Unit. We thank Mike Irwin for making the reduced data available.
A plot of the magnitudes is available at: http://www.jach.hawaii.edu/UKIRT/publications/SC/NovaOph2012_ATel_20130527.jpg
