Special Notice #390: New possible WZ Sge variable ASASSN-14jv

November 10, 2014: Astronomer's Telegram (ATel) #6676 (B.J. Shappee et al. 2014) notes the discovery of ASASSN-14jv, a bright optical transient found at V=11.3 on 2014 November 9.19 (JD 2456970.69). This object is suspected to be a cataclysmic variable of the WZ Sge subtype. Shappee et al. note that the source is less than one arcsecond away from a g=19.1 magnitude source in the Kepler Input Catalog, suggesting a large amplitude typical of UGWZ stars.

The object is quite blue, according to observations by A. Pal et al. (ATel #6680, 2014) that show the transient on 2014 Nov. 9.78 UT at B=10.7 +/-0.2, V=11.3 +/- 0.2, and R=11.9 +/- 0.2, based on USNO B1.0 magnitudes.

Observations by Enrique de Miguel (CBA Huelva, Spain) reported on 9 November 2014 [vsnet-alert 17950] show the presence of probable superhumps. That, combined with the large amplitude and color, indicates that the object is likely a WZ Sge star.

Both photometric (CCD and visual) and spectroscopic observations are encouraged, spectroscopy especially to confirm the nature of the object.

ASASSN-14jv was discovered at the following (J2000) coordinates:

    RA: 18 53 28.81   Dec: +42 03 43.3

Time series observations are encouraged for this star, preferably made using photometric filters, particularly Johnson V.

Observations reported to the AAVSO include:
2014 Nov. 09.76389 UT, 11.1 (KLO, L. Kocsmaros, Zrenjanin, Serbia);
09.71875, 11.1 (WKL, K. Wenzel, Grossostheim, Germany);

Charts for ASASSN-14jv may be created using the AAVSO Variable Star Plotter (VSP, www.aavso.org/vsp). A sequence is being created and will be available via VSP once it has been uploaded.

Please report observations to the AAVSO International Database using the name ASASSN-14jv. Be sure to indicate what comparison stars you used.

This AAVSO Special Notice was compiled by Matthew R. Templeton and Elizabeth O. Waagen.


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